12 files changed, 5396 insertions, 0 deletions

diff --git a/utils/CMakeLists.txt b/utils/CMakeLists.txt
new file mode 100644
index 0000000..2d5626e
--- /dev/null
+++ b/utils/CMakeLists.txt
@@ -0,0 +1,4 @@
+cmake_minimum_required (VERSION 3.10)
+project (HDF5_UTILS C)
+
+add_subdirectory (mirror_vfd)
diff --git a/utils/COPYING b/utils/COPYING
new file mode 100644
index 0000000..4a23112
--- /dev/null
+++ b/utils/COPYING
@@ -0,0 +1,12 @@
+
+  Copyright by The HDF Group.
+  All rights reserved.
+
+  The files and subdirectories in this directory are part of HDF5.
+  The full HDF5 copyright notice, including terms governing use,
+  modification, and redistribution, is contained in the COPYING file
+  which can be found at the root of the source code distribution tree
+  or in https://support.hdfgroup.org/ftp/HDF5/releases.  If you do
+  not have access to either file, you may request a copy from
+  help@hdfgroup.org.
+
diff --git a/utils/Makefile.am b/utils/Makefile.am
new file mode 100644
index 0000000..b4409ac
--- /dev/null
+++ b/utils/Makefile.am
@@ -0,0 +1,26 @@
+#
+# Copyright by The HDF Group.
+# All rights reserved.
+#
+# This file is part of HDF5.  The full HDF5 copyright notice, including
+# terms governing use, modification, and redistribution, is contained in
+# the COPYING file, which can be found at the root of the source code
+# distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.
+# If you do not have access to either file, you may request a copy from
+# help@hdfgroup.org.
+##
+## Makefile.am
+## Run automake to generate a Makefile.in from this file.
+##
+#
+# Utils HDF5 Makefile(.in)
+#
+
+include $(top_srcdir)/config/commence.am
+
+CONFIG=ordered
+
+# All subdirectories
+SUBDIRS=mirror_vfd
+
+include $(top_srcdir)/config/conclude.am
diff --git a/utils/Makefile.in b/utils/Makefile.in
new file mode 100644
index 0000000..5bfb6a7
--- /dev/null
+++ b/utils/Makefile.in
@@ -0,0 +1,1487 @@
+# Makefile.in generated by automake 1.15 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2014 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+#
+# Copyright by The HDF Group.
+# All rights reserved.
+#
+# This file is part of HDF5.  The full HDF5 copyright notice, including
+# terms governing use, modification, and redistribution, is contained in
+# the COPYING file, which can be found at the root of the source code
+# distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.
+# If you do not have access to either file, you may request a copy from
+# help@hdfgroup.org.
+#
+# Utils HDF5 Makefile(.in)
+#
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
+        -*O) strip_trailopt 'O'; skip_next=yes;; \
+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
+    esac; \
+  done; \
+  test $$has_opt = yes
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+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
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+am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
+install_sh_DATA = $(install_sh) -c -m 644
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+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
+build_triplet = @build@
+host_triplet = @host@
+TESTS =
+subdir = utils
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+am__aclocal_m4_deps = $(top_srcdir)/m4/aclocal_cxx.m4 \
+	$(top_srcdir)/m4/aclocal_fc.m4 \
+	$(top_srcdir)/m4/ax_check_class.m4 \
+	$(top_srcdir)/m4/ax_check_classpath.m4 \
+	$(top_srcdir)/m4/ax_check_java_home.m4 \
+	$(top_srcdir)/m4/ax_check_junit.m4 \
+	$(top_srcdir)/m4/ax_java_options.m4 \
+	$(top_srcdir)/m4/ax_jni_include_dir.m4 \
+	$(top_srcdir)/m4/ax_prog_jar.m4 \
+	$(top_srcdir)/m4/ax_prog_java.m4 \
+	$(top_srcdir)/m4/ax_prog_java_works.m4 \
+	$(top_srcdir)/m4/ax_prog_javac.m4 \
+	$(top_srcdir)/m4/ax_prog_javac_works.m4 \
+	$(top_srcdir)/m4/ax_prog_javadoc.m4 \
+	$(top_srcdir)/m4/ax_try_compile_java.m4 \
+	$(top_srcdir)/m4/libtool.m4 $(top_srcdir)/m4/ltoptions.m4 \
+	$(top_srcdir)/m4/ltsugar.m4 $(top_srcdir)/m4/ltversion.m4 \
+	$(top_srcdir)/m4/lt~obsolete.m4 $(top_srcdir)/configure.ac
+am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
+	$(ACLOCAL_M4)
+DIST_COMMON = $(srcdir)/Makefile.am $(am__DIST_COMMON)
+mkinstalldirs = $(install_sh) -d
+CONFIG_HEADER = $(top_builddir)/src/H5config.h \
+	$(top_builddir)/fortran/src/H5config_f.inc
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+	install-data-recursive install-dvi-recursive \
+	install-exec-recursive install-html-recursive \
+	install-info-recursive install-pdf-recursive \
+	install-ps-recursive install-recursive installcheck-recursive \
+	installdirs-recursive pdf-recursive ps-recursive \
+	tags-recursive uninstall-recursive
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+  case $$AM_UPDATE_INFO_DIR in \
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+  distclean-recursive maintainer-clean-recursive
+am__recursive_targets = \
+  $(RECURSIVE_TARGETS) \
+  $(RECURSIVE_CLEAN_TARGETS) \
+  $(am__extra_recursive_targets)
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+	check recheck distdir
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+ETAGS = etags
+CTAGS = ctags
+am__tty_colors_dummy = \
+  mgn= red= grn= lgn= blu= brg= std=; \
+  am__color_tests=no
+am__tty_colors = { \
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+    am__color_tests=yes; \
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+am__vpath_adj_setup = srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`;
+am__vpath_adj = case $$p in \
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+  esac;
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+am__nobase_list = $(am__nobase_strip_setup); \
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+  sed "s| $$srcdirstrip/| |;"' / .*\//!s/ .*/ ./; s,\( .*\)/[^/]*$$,\1,' | \
+  $(AWK) 'BEGIN { files["."] = "" } { files[$$2] = files[$$2] " " $$1; \
+    if (++n[$$2] == $(am__install_max)) \
+      { print $$2, files[$$2]; n[$$2] = 0; files[$$2] = "" } } \
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+am__base_list = \
+  sed '$$!N;$$!N;$$!N;$$!N;$$!N;$$!N;$$!N;s/\n/ /g' | \
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+am__uninstall_files_from_dir = { \
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+         $(am__cd) "$$dir" && rm -f $$files; }; \
+  }
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+am__global_test_result_rx = ^[ 	]*:global-test-result:[ 	]*
+am__copy_in_global_log_rx = ^[ 	]*:copy-in-global-log:[ 	]*
+# A command that, given a newline-separated list of test names on the
+# standard input, print the name of the tests that are to be re-run
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+am__list_recheck_tests = $(AWK) '{ \
+  recheck = 1; \
+  while ((rc = (getline line < ($$0 ".trs"))) != 0) \
+    { \
+      if (rc < 0) \
+        { \
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+        { \
+          break; \
+        } \
+    }; \
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+  close ($$0 ".log"); \
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+{ \
+  print header; \
+  len = length(header); \
+  for (i = 1; i <= len; i = i + 1) \
+    printf "="; \
+  printf "\n\n"; \
+} \
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+  global_test_result = "RUN"; \
+  while ((rc = (getline line < ($$0 ".trs"))) != 0) \
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+        { \
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+      rst_section(global_test_result ": " $$0); \
+      while ((rc = (getline line < ($$0 ".log"))) != 0) \
+      { \
+        if (rc < 0) \
+          fatal("failed to read from " $$0 ".log"); \
+        print line; \
+      }; \
+      printf "\n"; \
+    }; \
+  close ($$0 ".trs"); \
+  close ($$0 ".log"); \
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+case "$@" in						\
+  */*) am__odir=`echo "./$@" | sed 's|/[^/]*$$||'`;;	\
+    *) am__odir=.;; 					\
+esac;							\
+test "x$$am__odir" = x"." || test -d "$$am__odir" 	\
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+if test -f "./$$f"; then dir=./;			\
+elif test -f "$$f"; then dir=;				\
+else dir="$(srcdir)/"; fi;				\
+tst=$$dir$$f; log='$@'; 				\
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+else							\
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+    am__expect_failure=yes;;				\
+  *)							\
+    am__expect_failure=no;;				\
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+  bases=`for i in $$bases; do echo $$i; done | sed 's/\.log$$//'`; \
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+RECHECK_LOGS = $(TEST_LOGS)
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+  case '$@' in \
+    */*) \
+      case '$*' in \
+        */*) b='$*';; \
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+       esac;; \
+    *) \
+      b='$*';; \
+  esac
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+	$(top_srcdir)/config/commence.am \
+	$(top_srcdir)/config/conclude.am COPYING
+DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
+am__relativize = \
+  dir0=`pwd`; \
+  sed_first='s,^\([^/]*\)/.*$$,\1,'; \
+  sed_rest='s,^[^/]*/*,,'; \
+  sed_last='s,^.*/\([^/]*\)$$,\1,'; \
+  sed_butlast='s,/*[^/]*$$,,'; \
+  while test -n "$$dir1"; do \
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+      if test "$$first" = ".."; then \
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+      fi; \
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+  reldir="$$dir2"
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+
+# H5_CFLAGS holds flags that should be used when building hdf5,
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+# instead of CFLAGS, as CFLAGS is reserved solely for the user to define.
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+# Shell commands used in Makefiles
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+# Some machines need a command to run executables; this is that command
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+# We use RUNEXEC instead of RUNSERIAL directly because it may be that
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+# The trace script; this is used on source files from the C library to
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+# .chkexe files are used to mark tests that have run successfully.
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+	br='==================='; br=$$br$$br$$br$$br; \
+	result_count () \
+	{ \
+	    if test x"$$1" = x"--maybe-color"; then \
+	      maybe_colorize=yes; \
+	    elif test x"$$1" = x"--no-color"; then \
+	      maybe_colorize=no; \
+	    else \
+	      echo "$@: invalid 'result_count' usage" >&2; exit 4; \
+	    fi; \
+	    shift; \
+	    desc=$$1 count=$$2; \
+	    if test $$maybe_colorize = yes && test $$count -gt 0; then \
+	      color_start=$$3 color_end=$$std; \
+	    else \
+	      color_start= color_end=; \
+	    fi; \
+	    echo "$${color_start}# $$desc $$count$${color_end}"; \
+	}; \
+	create_testsuite_report () \
+	{ \
+	  result_count $$1 "TOTAL:" $$all   "$$brg"; \
+	  result_count $$1 "PASS: " $$pass  "$$grn"; \
+	  result_count $$1 "SKIP: " $$skip  "$$blu"; \
+	  result_count $$1 "XFAIL:" $$xfail "$$lgn"; \
+	  result_count $$1 "FAIL: " $$fail  "$$red"; \
+	  result_count $$1 "XPASS:" $$xpass "$$red"; \
+	  result_count $$1 "ERROR:" $$error "$$mgn"; \
+	}; \
+	{								\
+	  echo "$(PACKAGE_STRING): $(subdir)/$(TEST_SUITE_LOG)" |	\
+	    $(am__rst_title);						\
+	  create_testsuite_report --no-color;				\
+	  echo;								\
+	  echo ".. contents:: :depth: 2";				\
+	  echo;								\
+	  for b in $$bases; do echo $$b; done				\
+	    | $(am__create_global_log);					\
+	} >$(TEST_SUITE_LOG).tmp || exit 1;				\
+	mv $(TEST_SUITE_LOG).tmp $(TEST_SUITE_LOG);			\
+	if $$success; then						\
+	  col="$$grn";							\
+	 else								\
+	  col="$$red";							\
+	  test x"$$VERBOSE" = x || cat $(TEST_SUITE_LOG);		\
+	fi;								\
+	echo "$${col}$$br$${std}"; 					\
+	echo "$${col}Testsuite summary for $(PACKAGE_STRING)$${std}";	\
+	echo "$${col}$$br$${std}"; 					\
+	create_testsuite_report --maybe-color;				\
+	echo "$$col$$br$$std";						\
+	if $$success; then :; else					\
+	  echo "$${col}See $(subdir)/$(TEST_SUITE_LOG)$${std}";		\
+	  if test -n "$(PACKAGE_BUGREPORT)"; then			\
+	    echo "$${col}Please report to $(PACKAGE_BUGREPORT)$${std}";	\
+	  fi;								\
+	  echo "$$col$$br$$std";					\
+	fi;								\
+	$$success || exit 1
+recheck: all 
+	@test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+	@set +e; $(am__set_TESTS_bases); \
+	bases=`for i in $$bases; do echo $$i; done \
+	         | $(am__list_recheck_tests)` || exit 1; \
+	log_list=`for i in $$bases; do echo $$i.log; done`; \
+	log_list=`echo $$log_list`; \
+	$(MAKE) $(AM_MAKEFLAGS) $(TEST_SUITE_LOG) \
+	        am__force_recheck=am--force-recheck \
+	        TEST_LOGS="$$log_list"; \
+	exit $$?
+.sh.log:
+	@p='$<'; \
+	$(am__set_b); \
+	$(am__check_pre) $(SH_LOG_DRIVER) --test-name "$$f" \
+	--log-file $$b.log --trs-file $$b.trs \
+	$(am__common_driver_flags) $(AM_SH_LOG_DRIVER_FLAGS) $(SH_LOG_DRIVER_FLAGS) -- $(SH_LOG_COMPILE) \
+	"$$tst" $(AM_TESTS_FD_REDIRECT)
+@am__EXEEXT_TRUE@.sh$(EXEEXT).log:
+@am__EXEEXT_TRUE@	@p='$<'; \
+@am__EXEEXT_TRUE@	$(am__set_b); \
+@am__EXEEXT_TRUE@	$(am__check_pre) $(SH_LOG_DRIVER) --test-name "$$f" \
+@am__EXEEXT_TRUE@	--log-file $$b.log --trs-file $$b.trs \
+@am__EXEEXT_TRUE@	$(am__common_driver_flags) $(AM_SH_LOG_DRIVER_FLAGS) $(SH_LOG_DRIVER_FLAGS) -- $(SH_LOG_COMPILE) \
+@am__EXEEXT_TRUE@	"$$tst" $(AM_TESTS_FD_REDIRECT)
+
+distdir: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+	@list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    $(am__make_dryrun) \
+	      || test -d "$(distdir)/$$subdir" \
+	      || $(MKDIR_P) "$(distdir)/$$subdir" \
+	      || exit 1; \
+	    dir1=$$subdir; dir2="$(distdir)/$$subdir"; \
+	    $(am__relativize); \
+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
+	    $(am__relativize); \
+	    new_top_distdir=$$reldir; \
+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
+	    ($(am__cd) $$subdir && \
+	      $(MAKE) $(AM_MAKEFLAGS) \
+	        top_distdir="$$new_top_distdir" \
+	        distdir="$$new_distdir" \
+		am__remove_distdir=: \
+		am__skip_length_check=: \
+		am__skip_mode_fix=: \
+	        distdir) \
+	      || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-recursive
+all-am: Makefile all-local
+installdirs: installdirs-recursive
+installdirs-am:
+install: install-recursive
+install-exec: install-exec-recursive
+install-data: install-data-recursive
+uninstall: uninstall-recursive
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+	-test -z "$(TEST_LOGS)" || rm -f $(TEST_LOGS)
+	-test -z "$(TEST_LOGS:.log=.trs)" || rm -f $(TEST_LOGS:.log=.trs)
+	-test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libtool mostlyclean-am
+
+distclean: distclean-recursive
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-recursive
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-recursive
+
+install-html-am:
+
+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-generic mostlyclean-libtool \
+	mostlyclean-local
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: $(am__recursive_targets) check-am install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am all-local \
+	check check-TESTS check-am clean clean-generic clean-libtool \
+	cscopelist-am ctags ctags-am distclean distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs installdirs-am maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-generic \
+	mostlyclean-libtool mostlyclean-local pdf pdf-am ps ps-am \
+	recheck tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# List all build rules defined by HDF5 Makefiles as "PHONY" targets here.
+# This tells the Makefiles that these targets are not files to be built but
+# commands that should be executed even if a file with the same name already
+# exists.
+.PHONY: build-check-clean build-check-p build-check-s build-lib build-progs \
+        build-tests check-clean check-install check-p check-s check-vfd \
+        install-doc lib progs tests uninstall-doc _exec_check-s _test help
+
+help:
+	@$(top_srcdir)/bin/makehelp
+
+# lib/progs/tests targets recurse into subdirectories. build-* targets
+# build files in this directory.
+build-lib: $(LIB)
+build-progs: $(LIB) $(PROGS)
+build-tests: $(LIB) $(PROGS) $(chk_TESTS)
+
+# General rule for recursive building targets.
+# BUILT_SOURCES contain targets that need to be built before anything else
+# in the directory (e.g., for Fortran type detection)
+lib progs tests check-s check-p :: $(BUILT_SOURCES)
+	@$(MAKE) $(AM_MAKEFLAGS) build-$@ || exit 1;
+	@for d in X $(SUBDIRS); do                                             \
+	    if test $$d != X && test $$d != .; then                           \
+	        (set -x; cd $$d && $(MAKE) $(AM_MAKEFLAGS) $@) || exit 1;     \
+	    fi;                                                               \
+	done
+
+# General rule for recursive cleaning targets.  Like the rule above,
+# but doesn't require building BUILT_SOURCES.
+check-clean ::
+	@$(MAKE) $(AM_MAKEFLAGS) build-$@ || exit 1;
+	@for d in X $(SUBDIRS); do                                             \
+	    if test $$d != X && test $$d != .; then                           \
+	        (set -x; cd $$d && $(MAKE) $(AM_MAKEFLAGS) $@) || exit 1;     \
+	    fi;                                                               \
+	done
+
+# Tell Automake to build tests when the user types `make all' (this is
+# not its default behavior).  Also build EXTRA_LIB and EXTRA_PROG since
+# Automake won't build them automatically, either.
+all-local: $(EXTRA_LIB) $(EXTRA_PROG) $(chk_TESTS)
+
+# make install-doc doesn't do anything outside of doc directory, but
+# Makefiles should recognize it.
+# UPDATE: docs no longer reside in this build tree, so this target
+# is deprecated.
+install-doc uninstall-doc:
+	@echo "Nothing to be done."
+
+# clean up files generated by tests so they can be re-run.
+build-check-clean:
+	$(RM) -rf $(CHECK_CLEANFILES)
+
+# run check-clean whenever mostlyclean is run
+mostlyclean-local: build-check-clean
+
+# check-install is just a synonym for installcheck
+check-install: installcheck
+
+# Run each test in order, passing $(TEST_FLAGS) to the program.
+# Since tests are done in a shell loop, "make -i" does apply inside it.
+# Set HDF5_Make_Ignore to a non-blank string to ignore errors inside the loop.
+# The timestamps give a rough idea how much time the tests use.
+#
+# Note that targets in chk_TESTS (defined above) will be built when the user
+# types 'make tests' or 'make check', but only programs in TEST_PROG,
+# TEST_PROG_PARA, or TEST_SCRIPT will actually be executed.
+check-TESTS: test
+
+test _test:
+	@$(MAKE) build-check-s
+	@$(MAKE) build-check-p
+
+# Actual execution of check-s.
+build-check-s: $(LIB) $(PROGS) $(chk_TESTS)
+	@if test -n "$(TEST_PROG)$(TEST_SCRIPT)"; then      \
+	   echo "===Serial tests in `echo ${PWD} | sed -e s:.*/::` begin `date`==="; \
+	fi
+	@$(MAKE) $(AM_MAKEFLAGS) _exec_check-s
+	@if test -n "$(TEST_PROG)$(TEST_SCRIPT)"; then      \
+	    echo "===Serial tests in `echo ${PWD} | sed -e s:.*/::` ended `date`===";\
+	fi
+
+_exec_check-s: $(TEST_PROG_CHKEXE) $(TEST_SCRIPT_CHKSH)
+
+# The dummy.chkexe here prevents the target from being
+# empty if there are no tests in the current directory.
+# $${log} is the log file.
+# $${tname} is the name of test.
+$(TEST_PROG_CHKEXE) $(TEST_PROG_PARA_CHKEXE) dummy.chkexe_:
+	@if test "X$@" != "X.chkexe_" && test "X$@" != "Xdummy.chkexe_"; then \
+	   tname=$(@:.chkexe_=)$(EXEEXT);\
+	   log=$(@:.chkexe_=.chklog); \
+	   echo "============================"; \
+	   if $(top_srcdir)/bin/newer $(@:.chkexe_=.chkexe) $${tname}; then \
+	      echo "No need to test $${tname} again."; \
+	   else \
+              if test -n "$(REALTIMEOUTPUT)"; then \
+                 echo "============================" | tee $${log}; \
+              else \
+                 echo "============================" > $${log}; \
+              fi; \
+              if test "X$(FORTRAN_API)" = "Xyes"; then \
+                 echo "Fortran API: Testing $${tname} $(TEST_FLAGS)"; \
+                 if test -n "$(REALTIMEOUTPUT)"; then \
+                    echo "Fortran API: Test log for $${tname} $(TEST_FLAGS)" | tee -a $${log}; \
+                 else \
+                    echo "Fortran API: Test log for $${tname} $(TEST_FLAGS)" >> $${log}; \
+                 fi; \
+              elif test "X$(CXX_API)" = "Xyes"; then \
+                 echo "C++ API: Testing $${tname} $(TEST_FLAGS)"; \
+                 if test -n "$(REALTIMEOUTPUT)"; then \
+                    echo "C++ API: Test log for $${tname} $(TEST_FLAGS)" | tee -a $${log};\
+                 else \
+                    echo "C++ API: Test log for $${tname} $(TEST_FLAGS)" >> $${log};\
+                 fi; \
+              else \
+                 echo "Testing: $${tname} $(TEST_FLAGS)"; \
+                 if test -n "$(REALTIMEOUTPUT)"; then \
+                    echo "Test log for $${tname} $(TEST_FLAGS)" | tee -a $${log}; \
+                 else \
+                    echo "Test log for $${tname} $(TEST_FLAGS)" >> $${log}; \
+                 fi; \
+              fi; \
+              if test -n "$(REALTIMEOUTPUT)"; then \
+                if test -n "$(HDF5_DRIVER)"; then \
+                  echo "Virtual file driver (VFD): $(HDF5_DRIVER)" | tee -a $${log}; \
+                fi; \
+              else \
+                if test -n "$(HDF5_DRIVER)"; then \
+                  echo "Virtual file driver (VFD): $(HDF5_DRIVER)" >> $${log}; \
+                fi; \
+              fi; \
+              if test -n "$(REALTIMEOUTPUT)"; then \
+                 echo "============================" | tee -a $${log}; \
+              else \
+                 echo "============================" >> $${log}; \
+              fi; \
+              if test -n "$(REALTIMEOUTPUT)"; then \
+                 srcdir="$(srcdir)" \
+                 $(TIME) $(RUNEXEC) ./$${tname} $(TEST_FLAGS) | tee -a $${log} 2>&1 \
+                 && touch $(@:.chkexe_=.chkexe) || \
+                 (test $$HDF5_Make_Ignore && echo "*** Error ignored") || \
+                 (cat $${log} && false) || exit 1; \
+              else \
+                 srcdir="$(srcdir)" \
+                 $(TIME) $(RUNEXEC) ./$${tname} $(TEST_FLAGS) >> $${log} 2>&1 \
+                 && touch $(@:.chkexe_=.chkexe) || \
+                 (test $$HDF5_Make_Ignore && echo "*** Error ignored") || \
+                 (cat $${log} && false) || exit 1; \
+              fi; \
+	      echo "" >> $${log}; \
+              if test -n "$(REALTIMEOUTPUT)"; then \
+                 echo "Finished testing $${tname} $(TEST_FLAGS)" | tee -a $${log}; \
+                 echo "============================" | tee -a $${log}; \
+              else \
+                 echo "Finished testing $${tname} $(TEST_FLAGS)" >> $${log}; \
+                 echo "============================" >> $${log}; \
+              fi; \
+              if test -z "$(REALTIMEOUTPUT)"; then \
+                 cat $${log}; \
+              fi; \
+	   fi; \
+	fi
+
+# The dummysh.chkexe here prevents the target from being
+# empty if there are no tests in the current directory.
+# $${log} is the log file.
+# $${tname} is the name of test.
+$(TEST_SCRIPT_CHKSH) $(TEST_SCRIPT_PARA_CHKSH) dummysh.chkexe_:
+	@if test "X$@" != "X.chkexe_" && test "X$@" != "Xdummysh.chkexe_"; then \
+	   cmd=$(@:.chkexe_=);\
+	   tname=`basename $$cmd`;\
+	   chkname=`basename $(@:.chkexe_=.chkexe)`;\
+	   log=`basename $(@:.chkexe_=.chklog)`; \
+	   echo "============================"; \
+	   if $(top_srcdir)/bin/newer $${chkname} $$cmd $(SCRIPT_DEPEND); then \
+	      echo "No need to test $${tname} again."; \
+	   else \
+	      echo "============================" > $${log}; \
+	      if test "X$(FORTRAN_API)" = "Xyes"; then \
+	         echo "Fortran API: Testing $${tname} $(TEST_FLAGS)"; \
+	         echo "Fortran API: $${tname} $(TEST_FLAGS) Test Log" >> $${log}; \
+	      elif test "X$(CXX_API)" = "Xyes"; then \
+	         echo "C++ API: Testing $${tname} $(TEST_FLAGS)"; \
+	         echo "C++ API: $${tname} $(TEST_FLAGS) Test Log" >> $${log}; \
+	      else \
+	         echo "Testing $${tname} $(TEST_FLAGS)"; \
+	         echo "$${tname} $(TEST_FLAGS) Test Log" >> $${log}; \
+	      fi; \
+	      echo "============================" >> $${log}; \
+	      RUNSERIAL="$(RUNSERIAL)" RUNPARALLEL="$(RUNPARALLEL)"           \
+	      srcdir="$(srcdir)" \
+	         $(TIME) $(SHELL) $$cmd $(TEST_FLAGS) >> $${log} 2>&1 \
+	         && touch $${chkname} || \
+	         (test $$HDF5_Make_Ignore && echo "*** Error ignored") || \
+	         (cat $${log} && false) || exit 1; \
+	      echo "" >> $${log}; \
+	      echo "Finished testing $${tname} $(TEST_FLAGS)" >> $${log}; \
+	      echo "============================" >> $${log}; \
+	      echo "Finished testing $${tname} $(TEST_FLAGS)"; \
+	      cat $${log}; \
+	   fi; \
+	   echo "============================"; \
+	fi
+
+# Actual execution of check-p.
+build-check-p: $(LIB) $(PROGS) $(chk_TESTS)
+	@if test -n "$(TEST_PROG_PARA)$(TEST_SCRIPT_PARA)"; then      \
+	   echo "===Parallel tests in `echo ${PWD} | sed -e s:.*/::` begin `date`==="; \
+	fi
+	@if test -n "$(TEST_PROG_PARA)"; then                                \
+	    echo "**** Hint ****";                                            \
+	    echo "Parallel test files reside in the current directory"        \
+	         "by default.";                                               \
+	    echo "Set HDF5_PARAPREFIX to use another directory. e.g.,";       \
+	    echo "    HDF5_PARAPREFIX=/PFS/user/me";                          \
+	    echo "    export HDF5_PARAPREFIX";                                \
+	    echo "    make check";                                            \
+	    echo "**** end of Hint ****";                                     \
+	fi
+	@for test in $(TEST_PROG_PARA) dummy; do                             \
+	   if test $$test != dummy; then                                      \
+	      $(MAKE) $(AM_MAKEFLAGS) $$test.chkexe_ \
+	      RUNEXEC="$(RUNPARALLEL)" || exit 1; \
+	   fi;                                                                \
+	done
+	@for test in $(TEST_SCRIPT_PARA) dummy; do                           \
+	  if test $$test != dummy; then                                      \
+	    $(MAKE) $(AM_MAKEFLAGS) $$test.chkexe_ || exit 1; \
+	  fi;                                                                 \
+	done
+	@if test -n "$(TEST_PROG_PARA)$(TEST_SCRIPT_PARA)"; then      \
+	    echo "===Parallel tests in `echo ${PWD} | sed -e s:.*/::` ended `date`===";\
+	fi
+
+# Run test with different Virtual File Driver
+check-vfd: $(LIB) $(PROGS) $(chk_TESTS)
+	@for vfd in $(VFD_LIST) dummy; do                                     \
+	    if test $$vfd != dummy; then                                      \
+	        echo "============================";                          \
+	        echo "Testing Virtual File Driver $$vfd";                     \
+	        echo "============================";                          \
+	        $(MAKE) $(AM_MAKEFLAGS) check-clean || exit 1;                \
+	        HDF5_DRIVER=$$vfd $(MAKE) $(AM_MAKEFLAGS) check || exit 1;    \
+	    fi;                                                               \
+	done
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/utils/mirror_vfd/CMakeLists.txt b/utils/mirror_vfd/CMakeLists.txt
new file mode 100644
index 0000000..6137e82
--- /dev/null
+++ b/utils/mirror_vfd/CMakeLists.txt
@@ -0,0 +1,64 @@
+cmake_minimum_required (VERSION 3.10)
+project (HDF5_UTILS_MIRRORVFD C)
+
+#-----------------------------------------------------------------------------
+# Add the mirror_server executable
+#-----------------------------------------------------------------------------
+
+set (mirror_server_SOURCES
+        ${HDF5_UTILS_MIRRORVFD_SOURCE_DIR}/mirror_remote.c
+        ${HDF5_UTILS_MIRRORVFD_SOURCE_DIR}/mirror_server.c
+        ${HDF5_UTILS_MIRRORVFD_SOURCE_DIR}/mirror_writer.c)
+add_executable (mirror_server ${mirror_server_SOURCES})
+target_include_directories (mirror_server PRIVATE "${HDF5_UITLS_DIR};${HDF5_SRC_DIR};${HDF5_BINARY_DIR};$<$<BOOL:${HDF5_ENABLE_PARALLEL}>:${MPI_C_INCLUDE_DIRS}>")
+if (NOT BUILD_SHARED_LIBS)
+  TARGET_C_PROPERTIES (mirror_server STATIC)
+  target_link_libraries (mirror_server PRIVATE ${HDF5_LIB_TARGET})
+else ()
+  TARGET_C_PROPERTIES (mirror_server SHARED)
+  target_link_libraries (mirror_server PRIVATE ${HDF5_LIBSH_TARGET})
+endif ()
+set_target_properties (mirror_server PROPERTIES FOLDER utils)
+set_global_variable (HDF5_UTILS_TO_EXPORT "${HDF5_UTILS_TO_EXPORT};mirror_server")
+set (H5_DEP_EXECUTABLES ${H5_DEP_EXECUTABLES} mirror_server)
+
+#-----------------------------------------------------------------------------
+# Add the mirror_server_stop executable
+#-----------------------------------------------------------------------------
+
+set (mirror_server_stop_SOURCES ${HDF5_UTILS_MIRRORVFD_SOURCE_DIR}/mirror_server_stop.c)
+add_executable (mirror_server_stop ${mirror_server_stop_SOURCES})
+target_include_directories (mirror_server_stop PRIVATE "${HDF5_UITLS_DIR};${HDF5_SRC_DIR};${HDF5_BINARY_DIR};$<$<BOOL:${HDF5_ENABLE_PARALLEL}>:${MPI_C_INCLUDE_DIRS}>")
+if (NOT BUILD_SHARED_LIBS)
+  TARGET_C_PROPERTIES (mirror_server_stop STATIC)
+  target_link_libraries (mirror_server_stop PRIVATE ${HDF5_LIB_TARGET})
+else ()
+  TARGET_C_PROPERTIES (mirror_server_stop SHARED)
+  target_link_libraries (mirror_server_stop PRIVATE ${HDF5_LIBSH_TARGET})
+endif ()
+set_target_properties (mirror_server_stop PROPERTIES FOLDER utils)
+set_global_variable (HDF5_UTILS_TO_EXPORT "${HDF5_UTILS_TO_EXPORT};mirror_server_stop")
+set (H5_DEP_EXECUTABLES ${H5_DEP_EXECUTABLES} mirror_server_stop)
+
+##############################################################################
+##############################################################################
+###           I N S T A L L A T I O N                                      ###
+##############################################################################
+##############################################################################
+
+#-----------------------------------------------------------------------------
+# Rules for Installation of tools using make Install target
+#-----------------------------------------------------------------------------
+if (HDF5_EXPORTED_TARGETS)
+  foreach (exec ${H5_DEP_EXECUTABLES})
+    INSTALL_PROGRAM_PDB (${exec} ${HDF5_INSTALL_BIN_DIR} utilsapplications)
+  endforeach ()
+
+  install (
+      TARGETS
+          ${H5_DEP_EXECUTABLES}
+      EXPORT
+          ${HDF5_EXPORTED_TARGETS}
+      RUNTIME DESTINATION ${HDF5_INSTALL_BIN_DIR} COMPONENT utilsapplications
+  )
+endif ()
diff --git a/utils/mirror_vfd/Makefile.am b/utils/mirror_vfd/Makefile.am
new file mode 100644
index 0000000..96d3104
--- /dev/null
+++ b/utils/mirror_vfd/Makefile.am
@@ -0,0 +1,30 @@
+#
+# Copyright by The HDF Group.
+# All rights reserved.
+#
+# This file is part of HDF5.  The full HDF5 copyright notice, including
+# terms governing use, modification, and redistribution, is contained in
+# the COPYING file, which can be found at the root of the source code
+# distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.
+# If you do not have access to either file, you may request a copy from
+# help@hdfgroup.org.
+##
+## Makefile.am
+## Run automake to generate a Makefile.in from this file.
+#
+# HDF5 Library Makefile(.in)
+#
+
+include $(top_srcdir)/config/commence.am
+
+AM_CPPFLAGS+=-I$(top_srcdir)/src
+
+bin_PROGRAMS = mirror_server mirror_server_stop
+
+mirror_server_SOURCES = mirror_server.c mirror_writer.c mirror_remote.c
+#mirror_writer_SOURCES = mirror_writer.c mirror_remote.c
+
+# All programs depend on the hdf5 library
+LDADD=$(LIBHDF5)
+
+include $(top_srcdir)/config/conclude.am
diff --git a/utils/mirror_vfd/Makefile.in b/utils/mirror_vfd/Makefile.in
new file mode 100644
index 0000000..5e4f613
--- /dev/null
+++ b/utils/mirror_vfd/Makefile.in
@@ -0,0 +1,1512 @@
+# Makefile.in generated by automake 1.15 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2014 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+#
+# Copyright by The HDF Group.
+# All rights reserved.
+#
+# This file is part of HDF5.  The full HDF5 copyright notice, including
+# terms governing use, modification, and redistribution, is contained in
+# the COPYING file, which can be found at the root of the source code
+# distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.
+# If you do not have access to either file, you may request a copy from
+# help@hdfgroup.org.
+#
+# HDF5 Library Makefile(.in)
+#
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
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+mkinstalldirs = $(install_sh) -d
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+	$(top_builddir)/fortran/src/H5config_f.inc
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+am__installdirs = "$(DESTDIR)$(bindir)"
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+	mirror_writer.$(OBJEXT) mirror_remote.$(OBJEXT)
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+	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
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+# H5_CFLAGS holds flags that should be used when building hdf5,
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+PAC_FC_ALL_REAL_KINDS = @PAC_FC_ALL_REAL_KINDS@
+PAC_FC_ALL_REAL_KINDS_SIZEOF = @PAC_FC_ALL_REAL_KINDS_SIZEOF@
+PAC_FC_MAX_REAL_PRECISION = @PAC_FC_MAX_REAL_PRECISION@
+PAC_FORTRAN_NATIVE_DOUBLE_KIND = @PAC_FORTRAN_NATIVE_DOUBLE_KIND@
+PAC_FORTRAN_NATIVE_DOUBLE_SIZEOF = @PAC_FORTRAN_NATIVE_DOUBLE_SIZEOF@
+PAC_FORTRAN_NATIVE_INTEGER_KIND = @PAC_FORTRAN_NATIVE_INTEGER_KIND@
+PAC_FORTRAN_NATIVE_INTEGER_SIZEOF = @PAC_FORTRAN_NATIVE_INTEGER_SIZEOF@
+PAC_FORTRAN_NATIVE_REAL_KIND = @PAC_FORTRAN_NATIVE_REAL_KIND@
+PAC_FORTRAN_NATIVE_REAL_SIZEOF = @PAC_FORTRAN_NATIVE_REAL_SIZEOF@
+PAC_FORTRAN_NUM_INTEGER_KINDS = @PAC_FORTRAN_NUM_INTEGER_KINDS@
+PARALLEL = @PARALLEL@
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+R_LARGE = @R_LARGE@
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+# Install directories that automake doesn't know about
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+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+
+# Shell commands used in Makefiles
+RM = rm -f
+CP = cp
+
+# Some machines need a command to run executables; this is that command
+# so that our tests will run.
+# We use RUNEXEC instead of RUNSERIAL directly because it may be that
+# some tests need to be run with a different command.  Older versions
+# of the makefiles used the command
+# $(LIBTOOL) --mode=execute
+# in some directories, for instance.
+RUNEXEC = $(RUNSERIAL)
+
+# Libraries to link to while building
+LIBHDF5 = $(top_builddir)/src/libhdf5.la
+LIBH5TEST = $(top_builddir)/test/libh5test.la
+LIBH5F = $(top_builddir)/fortran/src/libhdf5_fortran.la
+LIBH5FTEST = $(top_builddir)/fortran/test/libh5test_fortran.la
+LIBH5CPP = $(top_builddir)/c++/src/libhdf5_cpp.la
+LIBH5JNI = $(top_builddir)/java/src/jni/libhdf5_java.la
+LIBH5TOOLS = $(top_builddir)/tools/lib/libh5tools.la
+LIBH5_HL = $(top_builddir)/hl/src/libhdf5_hl.la
+LIBH5F_HL = $(top_builddir)/hl/fortran/src/libhdf5hl_fortran.la
+LIBH5CPP_HL = $(top_builddir)/hl/c++/src/libhdf5_hl_cpp.la
+
+# Note that in svn revision 19400 the '/' after DESTDIR in H5* variables below
+# has been removed. According to the official description of DESTDIR by Gnu at
+# http://www.gnu.org/prep/standards/html_node/DESTDIR.html, DESTDIR is
+# prepended to the normal and complete install path that it precedes for the
+# purpose of installing in a temporary directory which is useful for building
+# rpms and other packages.  The '/' after ${DESTDIR} will be followed by another
+# '/' at the beginning of the normal install path.  When DESTDIR is empty the
+# path then begins with '//', which is incorrect and causes problems at least for
+# Cygwin.
+
+# Scripts used to build examples
+# If only shared libraries have been installed, have h5cc build examples with
+# shared libraries instead of static libraries
+H5CC = ${DESTDIR}$(bindir)/h5cc
+H5CC_PP = ${DESTDIR}$(bindir)/h5pcc
+H5FC = ${DESTDIR}$(bindir)/h5fc
+H5FC_PP = ${DESTDIR}$(bindir)/h5pfc
+H5CPP = ${DESTDIR}$(bindir)/h5c++
+ACLOCAL_AMFLAGS = "-I m4"
+
+# The trace script; this is used on source files from the C library to
+# insert tracing macros.
+TRACE = perl $(top_srcdir)/bin/trace
+
+# .chkexe files are used to mark tests that have run successfully.
+# .chklog files are output from those tests.
+# *.clog and *.clog2 are from the MPE option.
+CHECK_CLEANFILES = *.chkexe *.chklog *.clog *.clog2
+mirror_server_SOURCES = mirror_server.c mirror_writer.c mirror_remote.c
+#mirror_writer_SOURCES = mirror_writer.c mirror_remote.c
+
+# All programs depend on the hdf5 library
+LDADD = $(LIBHDF5)
+
+# Automake needs to be taught how to build lib, progs and tests targets.
+# These will be filled in automatically for the most part (e.g.,
+# lib_LIBRARIES are built for lib target), but EXTRA_LIB, EXTRA_PROG, and
+# EXTRA_TEST variables are supplied to allow the user to force targets to
+# be built at certain times.
+LIB = $(lib_LIBRARIES) $(lib_LTLIBRARIES) $(noinst_LIBRARIES)                 \
+      $(noinst_LTLIBRARIES) $(check_LIBRARIES) $(check_LTLIBRARIES) $(EXTRA_LIB)
+
+PROGS = $(bin_PROGRAMS) $(bin_SCRIPTS) $(noinst_PROGRAMS) $(noinst_SCRIPTS)   \
+        $(EXTRA_PROG)
+
+chk_TESTS = $(check_PROGRAMS) $(check_SCRIPTS) $(EXTRA_TEST)
+TEST_EXTENSIONS = .sh
+SH_LOG_COMPILER = $(SHELL)
+AM_SH_LOG_FLAGS = 
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+TEST_PROG_CHKEXE = $(TEST_PROG:=.chkexe_)
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+TEST_SCRIPT_CHKSH = $(TEST_SCRIPT:=.chkexe_)
+TEST_SCRIPT_PARA_CHKSH = $(TEST_SCRIPT_PARA:=.chkexe_)
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .lo .log .o .obj .sh .sh$(EXEEXT) .trs
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+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign utils/mirror_vfd/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign utils/mirror_vfd/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe);; \
+	esac;
+$(top_srcdir)/config/commence.am $(top_srcdir)/config/conclude.am $(am__empty):
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
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+	@$(NORMAL_INSTALL)
+	@list='$(bin_PROGRAMS)'; test -n "$(bindir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(bindir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(bindir)" || exit 1; \
+	fi; \
+	for p in $$list; do echo "$$p $$p"; done | \
+	sed 's/$(EXEEXT)$$//' | \
+	while read p p1; do if test -f $$p \
+	 || test -f $$p1 \
+	  ; then echo "$$p"; echo "$$p"; else :; fi; \
+	done | \
+	sed -e 'p;s,.*/,,;n;h' \
+	    -e 's|.*|.|' \
+	    -e 'p;x;s,.*/,,;s/$(EXEEXT)$$//;$(transform);s/$$/$(EXEEXT)/' | \
+	sed 'N;N;N;s,\n, ,g' | \
+	$(AWK) 'BEGIN { files["."] = ""; dirs["."] = 1 } \
+	  { d=$$3; if (dirs[d] != 1) { print "d", d; dirs[d] = 1 } \
+	    if ($$2 == $$4) files[d] = files[d] " " $$1; \
+	    else { print "f", $$3 "/" $$4, $$1; } } \
+	  END { for (d in files) print "f", d, files[d] }' | \
+	while read type dir files; do \
+	    if test "$$dir" = .; then dir=; else dir=/$$dir; fi; \
+	    test -z "$$files" || { \
+	    echo " $(INSTALL_PROGRAM_ENV) $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL_PROGRAM) $$files '$(DESTDIR)$(bindir)$$dir'"; \
+	    $(INSTALL_PROGRAM_ENV) $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL_PROGRAM) $$files "$(DESTDIR)$(bindir)$$dir" || exit $$?; \
+	    } \
+	; done
+
+uninstall-binPROGRAMS:
+	@$(NORMAL_UNINSTALL)
+	@list='$(bin_PROGRAMS)'; test -n "$(bindir)" || list=; \
+	files=`for p in $$list; do echo "$$p"; done | \
+	  sed -e 'h;s,^.*/,,;s/$(EXEEXT)$$//;$(transform)' \
+	      -e 's/$$/$(EXEEXT)/' \
+	`; \
+	test -n "$$list" || exit 0; \
+	echo " ( cd '$(DESTDIR)$(bindir)' && rm -f" $$files ")"; \
+	cd "$(DESTDIR)$(bindir)" && rm -f $$files
+
+clean-binPROGRAMS:
+	@list='$(bin_PROGRAMS)'; test -n "$$list" || exit 0; \
+	echo " rm -f" $$list; \
+	rm -f $$list || exit $$?; \
+	test -n "$(EXEEXT)" || exit 0; \
+	list=`for p in $$list; do echo "$$p"; done | sed 's/$(EXEEXT)$$//'`; \
+	echo " rm -f" $$list; \
+	rm -f $$list
+
+mirror_server$(EXEEXT): $(mirror_server_OBJECTS) $(mirror_server_DEPENDENCIES) $(EXTRA_mirror_server_DEPENDENCIES) 
+	@rm -f mirror_server$(EXEEXT)
+	$(AM_V_CCLD)$(LINK) $(mirror_server_OBJECTS) $(mirror_server_LDADD) $(LIBS)
+
+mirror_server_stop$(EXEEXT): $(mirror_server_stop_OBJECTS) $(mirror_server_stop_DEPENDENCIES) $(EXTRA_mirror_server_stop_DEPENDENCIES) 
+	@rm -f mirror_server_stop$(EXEEXT)
+	$(AM_V_CCLD)$(LINK) $(mirror_server_stop_OBJECTS) $(mirror_server_stop_LDADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/mirror_remote.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/mirror_server.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/mirror_server_stop.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/mirror_writer.Po@am__quote@
+
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+	fi
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
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+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+# Recover from deleted '.trs' file; this should ensure that
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+	rm -f $< $@
+	$(MAKE) $(AM_MAKEFLAGS) $<
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+	redo_bases=`for i in $$bases; do \
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+	            done`; \
+	if test -n "$$redo_bases"; then \
+	  redo_logs=`for i in $$redo_bases; do echo $$i.log; done`; \
+	  redo_results=`for i in $$redo_bases; do echo $$i.trs; done`; \
+	  if $(am__make_dryrun); then :; else \
+	    rm -f $$redo_logs && rm -f $$redo_results || exit 1; \
+	  fi; \
+	fi; \
+	if test -n "$$am__remaking_logs"; then \
+	  echo "fatal: making $(TEST_SUITE_LOG): possible infinite" \
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+	  am__remaking_logs=yes $(MAKE) $(AM_MAKEFLAGS) $$redo_logs; \
+	fi; \
+	if $(am__make_dryrun); then :; else \
+	  st=0;  \
+	  errmsg="fatal: making $(TEST_SUITE_LOG): failed to create"; \
+	  for i in $$redo_bases; do \
+	    test -f $$i.trs && test -r $$i.trs \
+	      || { echo "$$errmsg $$i.trs" >&2; st=1; }; \
+	    test -f $$i.log && test -r $$i.log \
+	      || { echo "$$errmsg $$i.log" >&2; st=1; }; \
+	  done; \
+	  test $$st -eq 0 || exit 1; \
+	fi
+	@$(am__sh_e_setup); $(am__tty_colors); $(am__set_TESTS_bases); \
+	ws='[ 	]'; \
+	results=`for b in $$bases; do echo $$b.trs; done`; \
+	test -n "$$results" || results=/dev/null; \
+	all=`  grep "^$$ws*:test-result:"           $$results | wc -l`; \
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+	error=`grep "^$$ws*:test-result:$$ws*ERROR" $$results | wc -l`; \
+	if test `expr $$fail + $$xpass + $$error` -eq 0; then \
+	  success=true; \
+	else \
+	  success=false; \
+	fi; \
+	br='==================='; br=$$br$$br$$br$$br; \
+	result_count () \
+	{ \
+	    if test x"$$1" = x"--maybe-color"; then \
+	      maybe_colorize=yes; \
+	    elif test x"$$1" = x"--no-color"; then \
+	      maybe_colorize=no; \
+	    else \
+	      echo "$@: invalid 'result_count' usage" >&2; exit 4; \
+	    fi; \
+	    shift; \
+	    desc=$$1 count=$$2; \
+	    if test $$maybe_colorize = yes && test $$count -gt 0; then \
+	      color_start=$$3 color_end=$$std; \
+	    else \
+	      color_start= color_end=; \
+	    fi; \
+	    echo "$${color_start}# $$desc $$count$${color_end}"; \
+	}; \
+	create_testsuite_report () \
+	{ \
+	  result_count $$1 "TOTAL:" $$all   "$$brg"; \
+	  result_count $$1 "PASS: " $$pass  "$$grn"; \
+	  result_count $$1 "SKIP: " $$skip  "$$blu"; \
+	  result_count $$1 "XFAIL:" $$xfail "$$lgn"; \
+	  result_count $$1 "FAIL: " $$fail  "$$red"; \
+	  result_count $$1 "XPASS:" $$xpass "$$red"; \
+	  result_count $$1 "ERROR:" $$error "$$mgn"; \
+	}; \
+	{								\
+	  echo "$(PACKAGE_STRING): $(subdir)/$(TEST_SUITE_LOG)" |	\
+	    $(am__rst_title);						\
+	  create_testsuite_report --no-color;				\
+	  echo;								\
+	  echo ".. contents:: :depth: 2";				\
+	  echo;								\
+	  for b in $$bases; do echo $$b; done				\
+	    | $(am__create_global_log);					\
+	} >$(TEST_SUITE_LOG).tmp || exit 1;				\
+	mv $(TEST_SUITE_LOG).tmp $(TEST_SUITE_LOG);			\
+	if $$success; then						\
+	  col="$$grn";							\
+	 else								\
+	  col="$$red";							\
+	  test x"$$VERBOSE" = x || cat $(TEST_SUITE_LOG);		\
+	fi;								\
+	echo "$${col}$$br$${std}"; 					\
+	echo "$${col}Testsuite summary for $(PACKAGE_STRING)$${std}";	\
+	echo "$${col}$$br$${std}"; 					\
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+	echo "$$col$$br$$std";						\
+	if $$success; then :; else					\
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+	    echo "$${col}Please report to $(PACKAGE_BUGREPORT)$${std}";	\
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+	  echo "$$col$$br$$std";					\
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+	$(MAKE) $(AM_MAKEFLAGS) $(TEST_SUITE_LOG) \
+	        am__force_recheck=am--force-recheck \
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+	exit $$?
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+distdir: $(DISTFILES)
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+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
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+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
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+	esac; \
+	for file in $$dist_files; do \
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+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
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+	-test -z "$(TEST_LOGS:.log=.trs)" || rm -f $(TEST_LOGS:.log=.trs)
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+clean-am: clean-binPROGRAMS clean-generic clean-libtool mostlyclean-am
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+
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+# commands that should be executed even if a file with the same name already
+# exists.
+.PHONY: build-check-clean build-check-p build-check-s build-lib build-progs \
+        build-tests check-clean check-install check-p check-s check-vfd \
+        install-doc lib progs tests uninstall-doc _exec_check-s _test help
+
+help:
+	@$(top_srcdir)/bin/makehelp
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+# lib/progs/tests targets recurse into subdirectories. build-* targets
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+
+# General rule for recursive building targets.
+# BUILT_SOURCES contain targets that need to be built before anything else
+# in the directory (e.g., for Fortran type detection)
+lib progs tests check-s check-p :: $(BUILT_SOURCES)
+	@$(MAKE) $(AM_MAKEFLAGS) build-$@ || exit 1;
+	@for d in X $(SUBDIRS); do                                             \
+	    if test $$d != X && test $$d != .; then                           \
+	        (set -x; cd $$d && $(MAKE) $(AM_MAKEFLAGS) $@) || exit 1;     \
+	    fi;                                                               \
+	done
+
+# General rule for recursive cleaning targets.  Like the rule above,
+# but doesn't require building BUILT_SOURCES.
+check-clean ::
+	@$(MAKE) $(AM_MAKEFLAGS) build-$@ || exit 1;
+	@for d in X $(SUBDIRS); do                                             \
+	    if test $$d != X && test $$d != .; then                           \
+	        (set -x; cd $$d && $(MAKE) $(AM_MAKEFLAGS) $@) || exit 1;     \
+	    fi;                                                               \
+	done
+
+# Tell Automake to build tests when the user types `make all' (this is
+# not its default behavior).  Also build EXTRA_LIB and EXTRA_PROG since
+# Automake won't build them automatically, either.
+all-local: $(EXTRA_LIB) $(EXTRA_PROG) $(chk_TESTS)
+
+# make install-doc doesn't do anything outside of doc directory, but
+# Makefiles should recognize it.
+# UPDATE: docs no longer reside in this build tree, so this target
+# is deprecated.
+install-doc uninstall-doc:
+	@echo "Nothing to be done."
+
+# clean up files generated by tests so they can be re-run.
+build-check-clean:
+	$(RM) -rf $(CHECK_CLEANFILES)
+
+# run check-clean whenever mostlyclean is run
+mostlyclean-local: build-check-clean
+
+# check-install is just a synonym for installcheck
+check-install: installcheck
+
+# Run each test in order, passing $(TEST_FLAGS) to the program.
+# Since tests are done in a shell loop, "make -i" does apply inside it.
+# Set HDF5_Make_Ignore to a non-blank string to ignore errors inside the loop.
+# The timestamps give a rough idea how much time the tests use.
+#
+# Note that targets in chk_TESTS (defined above) will be built when the user
+# types 'make tests' or 'make check', but only programs in TEST_PROG,
+# TEST_PROG_PARA, or TEST_SCRIPT will actually be executed.
+check-TESTS: test
+
+test _test:
+	@$(MAKE) build-check-s
+	@$(MAKE) build-check-p
+
+# Actual execution of check-s.
+build-check-s: $(LIB) $(PROGS) $(chk_TESTS)
+	@if test -n "$(TEST_PROG)$(TEST_SCRIPT)"; then      \
+	   echo "===Serial tests in `echo ${PWD} | sed -e s:.*/::` begin `date`==="; \
+	fi
+	@$(MAKE) $(AM_MAKEFLAGS) _exec_check-s
+	@if test -n "$(TEST_PROG)$(TEST_SCRIPT)"; then      \
+	    echo "===Serial tests in `echo ${PWD} | sed -e s:.*/::` ended `date`===";\
+	fi
+
+_exec_check-s: $(TEST_PROG_CHKEXE) $(TEST_SCRIPT_CHKSH)
+
+# The dummy.chkexe here prevents the target from being
+# empty if there are no tests in the current directory.
+# $${log} is the log file.
+# $${tname} is the name of test.
+$(TEST_PROG_CHKEXE) $(TEST_PROG_PARA_CHKEXE) dummy.chkexe_:
+	@if test "X$@" != "X.chkexe_" && test "X$@" != "Xdummy.chkexe_"; then \
+	   tname=$(@:.chkexe_=)$(EXEEXT);\
+	   log=$(@:.chkexe_=.chklog); \
+	   echo "============================"; \
+	   if $(top_srcdir)/bin/newer $(@:.chkexe_=.chkexe) $${tname}; then \
+	      echo "No need to test $${tname} again."; \
+	   else \
+              if test -n "$(REALTIMEOUTPUT)"; then \
+                 echo "============================" | tee $${log}; \
+              else \
+                 echo "============================" > $${log}; \
+              fi; \
+              if test "X$(FORTRAN_API)" = "Xyes"; then \
+                 echo "Fortran API: Testing $${tname} $(TEST_FLAGS)"; \
+                 if test -n "$(REALTIMEOUTPUT)"; then \
+                    echo "Fortran API: Test log for $${tname} $(TEST_FLAGS)" | tee -a $${log}; \
+                 else \
+                    echo "Fortran API: Test log for $${tname} $(TEST_FLAGS)" >> $${log}; \
+                 fi; \
+              elif test "X$(CXX_API)" = "Xyes"; then \
+                 echo "C++ API: Testing $${tname} $(TEST_FLAGS)"; \
+                 if test -n "$(REALTIMEOUTPUT)"; then \
+                    echo "C++ API: Test log for $${tname} $(TEST_FLAGS)" | tee -a $${log};\
+                 else \
+                    echo "C++ API: Test log for $${tname} $(TEST_FLAGS)" >> $${log};\
+                 fi; \
+              else \
+                 echo "Testing: $${tname} $(TEST_FLAGS)"; \
+                 if test -n "$(REALTIMEOUTPUT)"; then \
+                    echo "Test log for $${tname} $(TEST_FLAGS)" | tee -a $${log}; \
+                 else \
+                    echo "Test log for $${tname} $(TEST_FLAGS)" >> $${log}; \
+                 fi; \
+              fi; \
+              if test -n "$(REALTIMEOUTPUT)"; then \
+                if test -n "$(HDF5_DRIVER)"; then \
+                  echo "Virtual file driver (VFD): $(HDF5_DRIVER)" | tee -a $${log}; \
+                fi; \
+              else \
+                if test -n "$(HDF5_DRIVER)"; then \
+                  echo "Virtual file driver (VFD): $(HDF5_DRIVER)" >> $${log}; \
+                fi; \
+              fi; \
+              if test -n "$(REALTIMEOUTPUT)"; then \
+                 echo "============================" | tee -a $${log}; \
+              else \
+                 echo "============================" >> $${log}; \
+              fi; \
+              if test -n "$(REALTIMEOUTPUT)"; then \
+                 srcdir="$(srcdir)" \
+                 $(TIME) $(RUNEXEC) ./$${tname} $(TEST_FLAGS) | tee -a $${log} 2>&1 \
+                 && touch $(@:.chkexe_=.chkexe) || \
+                 (test $$HDF5_Make_Ignore && echo "*** Error ignored") || \
+                 (cat $${log} && false) || exit 1; \
+              else \
+                 srcdir="$(srcdir)" \
+                 $(TIME) $(RUNEXEC) ./$${tname} $(TEST_FLAGS) >> $${log} 2>&1 \
+                 && touch $(@:.chkexe_=.chkexe) || \
+                 (test $$HDF5_Make_Ignore && echo "*** Error ignored") || \
+                 (cat $${log} && false) || exit 1; \
+              fi; \
+	      echo "" >> $${log}; \
+              if test -n "$(REALTIMEOUTPUT)"; then \
+                 echo "Finished testing $${tname} $(TEST_FLAGS)" | tee -a $${log}; \
+                 echo "============================" | tee -a $${log}; \
+              else \
+                 echo "Finished testing $${tname} $(TEST_FLAGS)" >> $${log}; \
+                 echo "============================" >> $${log}; \
+              fi; \
+              if test -z "$(REALTIMEOUTPUT)"; then \
+                 cat $${log}; \
+              fi; \
+	   fi; \
+	fi
+
+# The dummysh.chkexe here prevents the target from being
+# empty if there are no tests in the current directory.
+# $${log} is the log file.
+# $${tname} is the name of test.
+$(TEST_SCRIPT_CHKSH) $(TEST_SCRIPT_PARA_CHKSH) dummysh.chkexe_:
+	@if test "X$@" != "X.chkexe_" && test "X$@" != "Xdummysh.chkexe_"; then \
+	   cmd=$(@:.chkexe_=);\
+	   tname=`basename $$cmd`;\
+	   chkname=`basename $(@:.chkexe_=.chkexe)`;\
+	   log=`basename $(@:.chkexe_=.chklog)`; \
+	   echo "============================"; \
+	   if $(top_srcdir)/bin/newer $${chkname} $$cmd $(SCRIPT_DEPEND); then \
+	      echo "No need to test $${tname} again."; \
+	   else \
+	      echo "============================" > $${log}; \
+	      if test "X$(FORTRAN_API)" = "Xyes"; then \
+	         echo "Fortran API: Testing $${tname} $(TEST_FLAGS)"; \
+	         echo "Fortran API: $${tname} $(TEST_FLAGS) Test Log" >> $${log}; \
+	      elif test "X$(CXX_API)" = "Xyes"; then \
+	         echo "C++ API: Testing $${tname} $(TEST_FLAGS)"; \
+	         echo "C++ API: $${tname} $(TEST_FLAGS) Test Log" >> $${log}; \
+	      else \
+	         echo "Testing $${tname} $(TEST_FLAGS)"; \
+	         echo "$${tname} $(TEST_FLAGS) Test Log" >> $${log}; \
+	      fi; \
+	      echo "============================" >> $${log}; \
+	      RUNSERIAL="$(RUNSERIAL)" RUNPARALLEL="$(RUNPARALLEL)"           \
+	      srcdir="$(srcdir)" \
+	         $(TIME) $(SHELL) $$cmd $(TEST_FLAGS) >> $${log} 2>&1 \
+	         && touch $${chkname} || \
+	         (test $$HDF5_Make_Ignore && echo "*** Error ignored") || \
+	         (cat $${log} && false) || exit 1; \
+	      echo "" >> $${log}; \
+	      echo "Finished testing $${tname} $(TEST_FLAGS)" >> $${log}; \
+	      echo "============================" >> $${log}; \
+	      echo "Finished testing $${tname} $(TEST_FLAGS)"; \
+	      cat $${log}; \
+	   fi; \
+	   echo "============================"; \
+	fi
+
+# Actual execution of check-p.
+build-check-p: $(LIB) $(PROGS) $(chk_TESTS)
+	@if test -n "$(TEST_PROG_PARA)$(TEST_SCRIPT_PARA)"; then      \
+	   echo "===Parallel tests in `echo ${PWD} | sed -e s:.*/::` begin `date`==="; \
+	fi
+	@if test -n "$(TEST_PROG_PARA)"; then                                \
+	    echo "**** Hint ****";                                            \
+	    echo "Parallel test files reside in the current directory"        \
+	         "by default.";                                               \
+	    echo "Set HDF5_PARAPREFIX to use another directory. e.g.,";       \
+	    echo "    HDF5_PARAPREFIX=/PFS/user/me";                          \
+	    echo "    export HDF5_PARAPREFIX";                                \
+	    echo "    make check";                                            \
+	    echo "**** end of Hint ****";                                     \
+	fi
+	@for test in $(TEST_PROG_PARA) dummy; do                             \
+	   if test $$test != dummy; then                                      \
+	      $(MAKE) $(AM_MAKEFLAGS) $$test.chkexe_ \
+	      RUNEXEC="$(RUNPARALLEL)" || exit 1; \
+	   fi;                                                                \
+	done
+	@for test in $(TEST_SCRIPT_PARA) dummy; do                           \
+	  if test $$test != dummy; then                                      \
+	    $(MAKE) $(AM_MAKEFLAGS) $$test.chkexe_ || exit 1; \
+	  fi;                                                                 \
+	done
+	@if test -n "$(TEST_PROG_PARA)$(TEST_SCRIPT_PARA)"; then      \
+	    echo "===Parallel tests in `echo ${PWD} | sed -e s:.*/::` ended `date`===";\
+	fi
+
+# Run test with different Virtual File Driver
+check-vfd: $(LIB) $(PROGS) $(chk_TESTS)
+	@for vfd in $(VFD_LIST) dummy; do                                     \
+	    if test $$vfd != dummy; then                                      \
+	        echo "============================";                          \
+	        echo "Testing Virtual File Driver $$vfd";                     \
+	        echo "============================";                          \
+	        $(MAKE) $(AM_MAKEFLAGS) check-clean || exit 1;                \
+	        HDF5_DRIVER=$$vfd $(MAKE) $(AM_MAKEFLAGS) check || exit 1;    \
+	    fi;                                                               \
+	done
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/utils/mirror_vfd/mirror_remote.c b/utils/mirror_vfd/mirror_remote.c
new file mode 100644
index 0000000..81a3625
--- /dev/null
+++ b/utils/mirror_vfd/mirror_remote.c
@@ -0,0 +1,225 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/* Common operations for "remote" processes for the Mirror VFD.
+ *
+ * Jacob Smith, 2020-03-06
+ */
+
+#include "mirror_remote.h"
+
+#ifdef H5_HAVE_MIRROR_VFD
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    mirror_log
+ *
+ * Purpose:     Write message to the logging stream/file.
+ *              If logging info pointer is NULL, uses logging defaults.
+ * ----------------------------------------------------------------------------
+ */
+void
+mirror_log(struct mirror_log_info *info,
+           unsigned int            level,
+           const char             *format,
+           ...)
+{
+    FILE *stream = MIRROR_LOG_DEFAULT_STREAM;
+    unsigned int verbosity = MIRROR_LOG_DEFAULT_VERBOSITY;
+    hbool_t      custom = FALSE;
+
+    if (info != NULL && info->magic == MIRROR_LOG_INFO_MAGIC) {
+        stream = info->stream;
+        verbosity = info->verbosity;
+        custom = TRUE;
+    }
+
+    if (level == V_NONE) {
+        return;
+    }
+    else
+    if (level <= verbosity) {
+        if (custom == TRUE && info->prefix[0] != '\0') {
+            HDfprintf(stream, "%s", info->prefix);
+        }
+
+        switch (level) {
+        case (V_ERR) :
+            HDfprintf(stream, "ERROR ");
+            break;
+        case (V_WARN) :
+            HDfprintf(stream, "WARNING ");
+            break;
+        default:
+            break;
+        }
+
+        if (format != NULL) {
+            va_list args;
+            HDva_start(args, format);
+            HDvfprintf(stream, format, args);
+            HDva_end(args);
+        }
+
+        HDfprintf(stream, "\n");
+        HDfflush(stream);
+    } /* end if sufficiently verbose to print */
+} /* end mirror_log() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    session_log_bytes
+ *
+ * Purpose:     "Pretty-print" raw binary data to logging stream/file.
+ *              If info pointer is NULL, uses logging defaults.
+ * ----------------------------------------------------------------------------
+ */
+void
+mirror_log_bytes(struct mirror_log_info *info,
+                 unsigned int            level,
+                 size_t                  n_bytes,
+                 const unsigned char    *buf)
+{
+    FILE *stream = MIRROR_LOG_DEFAULT_STREAM;
+    unsigned int verbosity = MIRROR_LOG_DEFAULT_VERBOSITY;
+
+    if (buf == NULL) {
+        return;
+    }
+
+    if (info != NULL && info->magic == MIRROR_LOG_INFO_MAGIC) {
+        stream = info->stream;
+        verbosity = info->verbosity;
+    }
+
+    if (level <= verbosity) {
+        size_t bytes_written = 0;
+        const unsigned char *b = NULL;
+
+        /* print whole lines */
+        while ((n_bytes - bytes_written) >= 32) {
+            b = buf + bytes_written; /* point to region in buffer */
+            HDfprintf(stream,
+                    "%04zX  %02X%02X%02X%02X %02X%02X%02X%02X" \
+                          " %02X%02X%02X%02X %02X%02X%02X%02X" \
+                          " %02X%02X%02X%02X %02X%02X%02X%02X" \
+                          " %02X%02X%02X%02X %02X%02X%02X%02X\n",
+                    bytes_written,
+                    b[0], b[1], b[2], b[3],   b[4], b[5], b[6], b[7],
+                    b[8], b[9], b[10],b[11],  b[12],b[13],b[14],b[15],
+                    b[16],b[17],b[18],b[19],  b[20],b[21],b[22],b[23],
+                    b[24],b[25],b[26],b[27],  b[28],b[29],b[30],b[31]);
+            bytes_written += 32;
+        }
+
+        /* start partial line */
+        if (n_bytes > bytes_written) {
+            HDfprintf(stream, "%04zX ", bytes_written);
+        }
+
+        /* partial line blocks */
+        while ((n_bytes - bytes_written) >= 4) {
+            HDfprintf(stream, " %02X%02X%02X%02X",
+                    buf[bytes_written],   buf[bytes_written+1],
+                    buf[bytes_written+2], buf[bytes_written+3]);
+            bytes_written += 4;
+        }
+
+        /* block separator before partial block */
+        if (n_bytes > bytes_written) {
+            HDfprintf(stream, " ");
+        }
+
+        /* partial block individual bytes */
+        while (n_bytes > bytes_written) {
+            HDfprintf(stream, "%02X", buf[bytes_written++]);
+        }
+
+        /* end partial line */
+        HDfprintf(stream, "\n");
+    } /* end if suitably verbose to log */
+} /* end mirror_log_bytes() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    mirror_log_init
+ *
+ * Purpose:     Prepare a loginfo_t structure for use.
+ *
+ * Return:      Success: Pointer to newly-ceated info.
+ *              Failure: NULL. Either unable to allocate or cannot open file.
+ * ----------------------------------------------------------------------------
+ */
+loginfo_t *
+mirror_log_init(char *path, char *prefix, unsigned int verbosity)
+{
+    loginfo_t *info = NULL;
+
+    info = (loginfo_t *)HDmalloc(sizeof(loginfo_t));
+    if (info != NULL) {
+        info->magic = MIRROR_LOG_INFO_MAGIC;
+        info->verbosity = verbosity;
+        info->stream = MIRROR_LOG_DEFAULT_STREAM;
+        info->prefix[0] = '\0';
+
+        if (prefix && *prefix) {
+            HDstrncpy(info->prefix, prefix, MIRROR_LOG_PREFIX_MAX);
+        }
+
+        if (path && *path) {
+            FILE *f = NULL;
+            f = HDfopen(path, "w");
+            if (NULL == f) {
+                HDfprintf(MIRROR_LOG_DEFAULT_STREAM,
+                        "WARN custom logging path could not be opened: %s\n",
+                        path);
+                info->magic += 1;
+                HDfree(info);
+            }
+            else {
+                info->stream = f;
+            }
+        }
+
+    } /* end if able to allocate */
+
+    return info;
+} /* end mirror_log_init() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    mirror_log_term
+ *
+ * Purpose:     Shut down and clean up a loginfo_t structure.
+ *
+ * Return:      Success: SUCCEED. Resources released.
+ *              Failure: FAIL.    Indeterminite state.
+ * ----------------------------------------------------------------------------
+ */
+herr_t
+mirror_log_term(loginfo_t *info)
+{
+    if (info == NULL || info->magic != MIRROR_LOG_INFO_MAGIC) {
+        return FAIL;
+    }
+    if (info->stream != stderr || info->stream != stdout) {
+        if (HDfclose(info->stream) < 0) {
+            return FAIL;
+        }
+    }
+    info->magic += 1;
+    HDfree(info);
+    return SUCCEED;
+} /* end mirror_log_term() */
+
+#endif /* H5_HAVE_MIRROR_VFD */
+
diff --git a/utils/mirror_vfd/mirror_remote.h b/utils/mirror_vfd/mirror_remote.h
new file mode 100644
index 0000000..67e95a5
--- /dev/null
+++ b/utils/mirror_vfd/mirror_remote.h
@@ -0,0 +1,53 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/* Common definitions for "remote" processes for the Mirror VFD.
+ *
+ * Jacob Smith, 2020-03-06
+ */
+
+#include "hdf5.h"
+#include "H5private.h"
+
+#ifdef H5_HAVE_MIRROR_VFD
+
+#include "H5FDmirror_priv.h"    /* Private header for the mirror VFD */
+
+#define V_NONE 0
+#define V_ERR  1
+#define V_WARN 2
+#define V_INFO 3
+#define V_ALL  4
+
+#define MIRROR_LOG_DEFAULT_STREAM stdout
+#define MIRROR_LOG_DEFAULT_VERBOSITY V_WARN
+#define MIRROR_LOG_PREFIX_MAX 79
+#define MIRROR_LOG_INFO_MAGIC 0x569D589A
+
+typedef struct mirror_log_info {
+    uint32_t magic;
+    FILE     *stream;
+    unsigned int verbosity;
+    char     prefix[MIRROR_LOG_PREFIX_MAX+1];
+} loginfo_t;
+
+void mirror_log(loginfo_t *info, unsigned int level,
+        const char *format, ...);
+void mirror_log_bytes(loginfo_t *info, unsigned int level,
+        size_t n_bytes, const unsigned char *buf);
+loginfo_t *mirror_log_init(char *path, char *prefix, unsigned int verbosity);
+int mirror_log_term(loginfo_t *loginfo);
+
+herr_t run_writer(int socketfd, H5FD_mirror_xmit_open_t *xmit_open);
+
+#endif /* H5_HAVE_MIRROR_VFD */
+
diff --git a/utils/mirror_vfd/mirror_server.c b/utils/mirror_vfd/mirror_server.c
new file mode 100644
index 0000000..db7cf04
--- /dev/null
+++ b/utils/mirror_vfd/mirror_server.c
@@ -0,0 +1,666 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * "Server" application to associate a Mirror VFD Driver with a Writer.
+ *
+ * Server waits on a dedicated port for a Driver to attempt to connect.
+ * When connection is made, reads a message from the Driver.
+ * If message is "SHUTDOWN", Server closes connection and terminates.
+ * Else, if it receives an encoded OPEN xmit (from Driver), the Server forks
+ * itself; the child becomes a dedicated Writer and maintains connection with
+ * the Driver instance, and the parent process remains a Server and returns
+ * to listening for incoming requests.
+ * Else, the message is not recognized and is ignored.
+ *
+ *
+ *
+ * mirror_server [args]
+ *
+ * Primary server for coordinating mirror VFD connections with the remote
+ * process.
+ *
+ * args:
+ * --help, -h     Print help message and exit.
+ * --port=N       Positive integer for primary listening port.
+ * --verbosity=N  Debugging verbosity
+ *                0: none
+ *                1: errors
+ *                2: details
+ *                3: all
+ * --logpath=S    File path to direct debugging output, if any.
+ *                Default of none prints output to stdout.
+ *
+ */
+
+#include "mirror_remote.h"
+
+#ifdef H5_HAVE_MIRROR_VFD
+
+#define MAXBUF 2048             /* max buffer length.                        */
+#define LISTENQ 80              /* max pending mirrorS requests              */
+#define DEFAULT_PORT 3000       /* default listening port                    */
+#define MAX_PORT_LOOPS 20       /* max iteratations through port range       */
+#define PORT_LOOP_RETRY_DELAY 1 /* seconds to wait between port scans        */
+
+/* semi-unique "magic" numbers to sanity-check structure pointers */
+#define OP_ARGS_MAGIC    0xCF074379u
+#define SERVER_RUN_MAGIC 0x741B459Au
+
+
+/* ---------------------------------------------------------------------------
+ * Structure:   struct op_args
+ *
+ * Purpose:     Convenience structure for holding arguments from command-line.
+ *
+ * `magic` (uint32_t)
+ *      Semi-unique number to help validate a pointer to this struct type.
+ *      Must be OP_ARGS_MAGIC to be considered valid.
+ *
+ * `help` (int)
+ *      Flag that the help argument was present in the command line.
+ *
+ * `main_port` (int)
+ *      Flag that the help argument was present in the command line.
+ *
+ * `verbosity` (int)
+ *      Number between 0 (none) and 4 (all) that controls how much detail
+ *      the program prints as a course of logging.
+ *
+ * `log_prepend_serv` (int)
+ *      Flag that the logging messages should have 'S- ' at the start of each
+ *      line.
+ *
+ * `log_prepend_type` (int)
+ *      Flag that the logging messages should have the assocaited verbosity
+ *      level present in the line (e.g., "WARN", "ERROR", or "INFO").
+ *
+ * `log_path` (char *)
+ *      Path string from the command line, giving the absolute path
+ *      for the file for logging output. Can be empty.
+ *
+ * `writer_log_path` (char *)
+ *      Path string from the command line, giving the absolute path
+ *      for the file for writer's logging output. Can be empty.
+ *
+ * ---------------------------------------------------------------------------
+ */
+struct op_args {
+    uint32_t    magic;
+    int         help;
+    int         main_port;
+    int         verbosity;
+    int         log_prepend_serv;
+    int         log_prepend_type;
+    char        log_path[PATH_MAX+1];
+    char        writer_log_path[PATH_MAX+1];
+};
+
+
+/* ---------------------------------------------------------------------------
+ * Structure:   struct server_run
+ *
+ * Purpose:     Convenience structure for holding information about a server
+ *              in operation.
+ *
+ * `magic` (uint32_t)
+ *      Semi-unique number to help validate a pointer to this struct type.
+ *      Must be SERVER_RUN_MAGIC to be considered valid.
+ *
+ * `log_stream` (FILE *)
+ *      File handle where logging output is directed.
+ *      By default, is stdout.
+ *
+ * `opts` (struct opt_args)
+ *      Contained structure, holds the server's configuration.
+ *
+ * `listenfd` (int)
+ *      File descriptor of the listening socket.
+ *
+ * ---------------------------------------------------------------------------
+ */
+struct server_run {
+    uint32_t            magic;
+    struct op_args      opts;
+    struct mirror_log_info *loginfo;
+    int                 listenfd;
+};
+
+
+/* ---------------------------------------------------------------------------
+ * Function:   mybzero
+ *
+ * Purpose:    Introduce bzero without neededing it on the system.
+ *
+ * Programmer: Jacob Smith
+ *             2020-03-30
+ * ---------------------------------------------------------------------------
+ */
+static void mybzero(void *dest, size_t size)
+{
+    size_t i = 0;
+    char  *s = NULL;
+    HDassert(dest);
+    s = (char *)dest;
+    for (i = 0; i < size; i++) {
+        *(s+i) = 0;
+    }
+} /* end mybzero() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    usage
+ *
+ * Purpose:     Print the usage message to stdout.
+ * ---------------------------------------------------------------------------
+ */
+static void
+usage(void)
+{
+    HDfprintf(stdout,
+              "mirror_server [options]\n"                                     \
+              "\n"                                                            \
+              "Application for providing Mirror Writer process to "           \
+              " Mirror VFD on file-open.\n"                                   \
+              "Listens on a dedicated socket; forks as a Writer upon receipt" \
+              " of a valid OPEN xmit.\n"                                      \
+              "\n"                                                            \
+              "Options:\n"                                                    \
+              "--help [-h]         : Print this help message and quit.\n"     \
+              "--logpath=PATH      : File path for logging output "           \
+                  "(default none, to stdout).\n"                              \
+              "--port=PORT         : Primary port (default %d).\n"            \
+              "--verbosity=NUM     : Debug printing level "                   \
+                  "0..4, (default %d).\n",
+              DEFAULT_PORT,
+              MIRROR_LOG_DEFAULT_VERBOSITY);
+} /* end usage() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    parse_args
+ *
+ * Purpose:     Read command line options and store results in args_out
+ *              structure. Fails in event of unrecognized option.
+ *
+ * Return:      0 on success, -1 on failure.
+ * ---------------------------------------------------------------------------
+ */
+static int
+parse_args(int argc, char **argv, struct op_args *args_out)
+{
+    int i;
+
+    /* preset default values
+     */
+    args_out->main_port = DEFAULT_PORT;
+    args_out->help = 0;
+    args_out->log_prepend_serv = 1;
+    args_out->log_prepend_type = 1;
+    args_out->verbosity = MIRROR_LOG_DEFAULT_VERBOSITY;
+    /* preset empty strings */
+    mybzero(args_out->log_path,        PATH_MAX+1);
+    mybzero(args_out->writer_log_path, PATH_MAX+1);
+
+    if (argv == NULL || *argv == NULL) {
+        mirror_log(NULL, V_ERR, "invalid argv pointer");
+        return -1;
+    }
+
+    /* Loop over arguments after program name and writer_path */
+    for (i=2; i < argc; i++) {
+        if (!HDstrncmp(argv[i], "-h", 3) || !HDstrncmp(argv[i], "--help", 7)) {
+            mirror_log(NULL, V_INFO, "found help argument");
+            args_out->help = 1;
+            return 0;
+        } /* end if help */
+        else
+        if (!HDstrncmp(argv[i], "--port=", 7)) {
+            mirror_log(NULL, V_INFO, "parsing 'main_port' (%s)", argv[i]+7);
+            args_out->main_port = HDatoi(argv[i]+7);
+        } /* end if port */
+        else
+        if (!HDstrncmp(argv[i], "--verbosity=", 12)) {
+            mirror_log(NULL, V_INFO, "parsing 'verbosity' (%s)", argv[i]+12);
+            args_out->verbosity = HDatoi(argv[i]+12);
+        } /* end if verbosity */
+        else
+        if (!HDstrncmp(argv[i], "--logpath=", 10)) {
+            mirror_log(NULL, V_INFO, "parsing 'logpath' (%s)", argv[i]+10);
+            HDstrncpy(args_out->log_path, argv[i]+10, PATH_MAX);
+        } /* end if logpath */
+        else {
+            mirror_log(NULL, V_ERR, "unrecognized argument: %s", argv[i]);
+            return -1;
+        } /* end if unrecognized argument */
+    } /* end for each arg after the path to writer "receiver process" */
+
+    mirror_log(NULL, V_INFO, "all args parsed");
+
+    return 0;
+} /* end parse_args() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    prepare_listening_socket
+ *
+ * Purpose:     Configure and open a socket.
+ *              In event of error, attempts to undo its processes.
+ *
+ * Return:      Success: non-negative (the file descriptor of the socket)
+ *              Failure: -1
+ * ---------------------------------------------------------------------------
+ */
+static int
+prepare_listening_socket(struct server_run *run)
+{
+    struct sockaddr_in server_addr;
+    int _true = 1; /* needed for setsockopt() */
+    int ret_value = -1;
+    int ret = 0; /* for checking return value of function calls */
+
+    if (run == NULL || run->magic != SERVER_RUN_MAGIC) {
+        mirror_log(NULL, V_ERR, "invalid server_run pointer");
+        return -1;
+    }
+
+    mirror_log(run->loginfo, V_INFO, "preparing socket");
+
+    server_addr.sin_family      = AF_INET;
+    server_addr.sin_addr.s_addr = HDhtonl(INADDR_ANY);
+    server_addr.sin_port        = HDhtons((uint16_t)run->opts.main_port);
+
+    mirror_log(run->loginfo, V_INFO, "socket()");
+    ret_value = HDsocket(AF_INET, SOCK_STREAM, 0);
+    if (ret_value < 0) {
+        mirror_log(run->loginfo, V_ERR, "listening socket:%d", ret_value);
+        goto error;
+    }
+
+    mirror_log(run->loginfo, V_ALL, "setsockopt()");
+    HDsetsockopt(ret_value, SOL_SOCKET, SO_REUSEADDR, &_true, sizeof(int));
+
+    mirror_log(run->loginfo, V_INFO, "bind()");
+    ret = HDbind(ret_value, (struct sockaddr *)&server_addr,
+            sizeof(server_addr));
+    if (ret < 0) {
+        mirror_log(run->loginfo, V_ERR, "bind() %s", HDstrerror(errno));
+        goto error;
+    }
+
+    mirror_log(run->loginfo, V_INFO, "listen()");
+    ret = HDlisten(ret_value, LISTENQ);
+    if (ret < 0) {
+        mirror_log(run->loginfo, V_ERR, "H5FD server listen:%d", ret);
+        goto error;
+    }
+
+    return ret_value;
+
+error:
+    if (ret_value >= 0) {
+        HDshutdown(ret_value, SHUT_RDWR);
+        HDclose(ret_value);
+    }
+    return -1;
+} /* end prepare_listening_socket() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    init_server_run
+ *
+ * Purpose:     Set up server_run struct with default and specified values.
+ *
+ * Return:      Zero (0) if successful, -1 if an error occurred.
+ * ---------------------------------------------------------------------------
+ */
+static struct server_run *
+init_server_run(int argc, char **argv)
+{
+    struct server_run *run;
+
+    run = (struct server_run *)HDmalloc(sizeof(struct server_run));
+    if (run == NULL) {
+        mirror_log(NULL, V_ERR, "can't allocate server_run struct");
+        return NULL;
+    }
+
+    run->magic = (uint32_t)SERVER_RUN_MAGIC;
+    run->opts.magic = (uint32_t)OP_ARGS_MAGIC;
+    run->listenfd = -1;
+
+    if (parse_args(argc, argv, &(run->opts)) < 0) {
+        mirror_log(NULL, V_ERR, "can't parse arguments");
+        usage();
+        goto error;
+    }
+
+    if (run->opts.help) {
+        usage();
+        return run; /* early exit */
+    }
+
+    run->loginfo = mirror_log_init(run->opts.log_path, "s- ",
+            run->opts.verbosity);
+
+    run->listenfd = prepare_listening_socket(run);
+    if (run->listenfd < 0) {
+        mirror_log(NULL, V_ERR, "can't prepare listening socket");
+        goto error;
+    }
+
+    return run;
+
+error:
+    if (run != NULL) {
+        HDfree(run);
+    }
+    return NULL;
+
+} /* end init_server_run() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    term_server_run
+ *
+ * Purpose:     Close opened items in a sever_run and release the pointer.
+ *
+ * Return:      Zero (0) if successful, -1 if an error occurred.
+ * ---------------------------------------------------------------------------
+ */
+static int
+term_server_run(struct server_run *run)
+{
+    if (run == NULL || run->magic != SERVER_RUN_MAGIC) {
+        mirror_log(NULL, V_ERR, "invalid server_run pointer");
+        return -1;
+    }
+
+    mirror_log(run->loginfo, V_INFO, "shutting down");
+
+    if (run->listenfd >= 0) {
+        HDshutdown(run->listenfd, SHUT_RDWR); /* TODO: error-checking? */
+        HDclose(run->listenfd); /* TODO: error-checking? */
+        run->listenfd = -1;
+    }
+
+    if (mirror_log_term(run->loginfo) < 0) {
+        mirror_log(NULL, V_ERR, "can't close logging stream");
+        return -1; /* doesn't solve the problem, but informs of error */
+    }
+    run->loginfo = NULL;
+
+    (run->magic)++;
+    (run->opts.magic)++;
+    HDfree(run);
+    return 0;
+} /* end term_server_run() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    accept_connection
+ *
+ * Purpose:     Main working loop; process requests as they are received.
+ *              Does nothing if the run option help is set.
+ *
+ * Return:      -1 on error, else a non-negative file descriptor of the socket.
+ * ---------------------------------------------------------------------------
+ */
+static int
+accept_connection(struct server_run *run)
+{
+    struct sockaddr_in client_addr;        /**/
+    socklen_t          clilen;             /**/
+    struct hostent    *host_port = NULL;   /**/
+    char              *hostaddrp;          /**/
+    int                connfd = -1; /* connection file descriptor */
+
+    if (run == NULL || run->magic != SERVER_RUN_MAGIC) {
+        mirror_log(NULL, V_ERR, "invalid server_run pointer");
+        return -1;
+    }
+
+    /*------------------------------*/
+    /* accept a connection on a socket */
+    clilen = sizeof(client_addr);
+    connfd = HDaccept(run->listenfd, (struct sockaddr *)&client_addr, &clilen);
+    if (connfd < 0) {
+        mirror_log(run->loginfo, V_ERR, "accept:%d", connfd);
+        goto error;
+    }
+    mirror_log(run->loginfo, V_INFO, "connection achieved");
+
+    /*------------------------------*/
+    /* get client address information */
+    host_port = HDgethostbyaddr(
+            (const char *)&client_addr.sin_addr.s_addr,
+            sizeof(client_addr.sin_addr.s_addr),
+            AF_INET);
+    if (host_port == NULL) {
+        mirror_log(run->loginfo, V_ERR, "gethostbyaddr()");
+        goto error;
+    }
+
+    /* function has the string space statically scoped -- OK until next call */
+    hostaddrp = HDinet_ntoa(client_addr.sin_addr);
+    /* TODO? proper error-checking */
+
+    mirror_log(run->loginfo, V_INFO,
+            "server connected with %s (%s)",
+            host_port->h_name,
+            hostaddrp);
+
+    return connfd;
+
+error:
+    if (connfd >= 0) {
+        close(connfd);
+    }
+    return -1;
+} /* end accept_connection() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    wait_for_child
+ *
+ * Purpose:     Signal handler to reap zombie processes.
+ * ---------------------------------------------------------------------------
+ */
+static void
+wait_for_child(int sig)
+{
+    while (HDwaitpid(-1, NULL, WNOHANG) > 0);
+} /* end wait_for_child() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    handle_requests
+ *
+ * Purpose:     Main working loop; process requests as they are received.
+ *              Does nothing if the run option `help` is set.
+ *
+ * Return:      -1 on error, else 0 for successful operation.
+ * ---------------------------------------------------------------------------
+ */
+static int
+handle_requests(struct server_run *run)
+{
+    int         connfd = -1;        /**/
+    char        mybuf[H5FD_MIRROR_XMIT_OPEN_SIZE];      /**/
+    int         ret;                /* general-purpose error-checking */
+    int         pid;                /* process ID of fork */
+    struct sigaction sa;
+    int         ret_value = 0;
+
+    if (run == NULL || run->magic != SERVER_RUN_MAGIC) {
+        mirror_log(NULL, V_ERR, "invalid server_run pointer");
+        return -1;
+    }
+
+    if (run->opts.help) {
+        return 0;
+    }
+
+    if (run->listenfd < 0) {
+        mirror_log(NULL, V_ERR, "invalid listening socket");
+        return -1;
+    }
+
+    /* Set up the signal handler */
+    sa.sa_handler = wait_for_child;
+    HDsigemptyset(&sa.sa_mask);
+    sa.sa_flags = SA_RESTART;
+    if (HDsigaction(SIGCHLD, &sa, NULL) == -1) {
+        perror("sigaction");
+        return 1;
+    }
+
+    /* Keep listening for attempts to connect.
+     */
+
+    while (1) { /* infinite loop, exited via break or goto */
+        mirror_log(run->loginfo, V_INFO, "server waiting for connections...");
+
+        connfd = -1;
+
+        connfd = accept_connection(run);
+        if (connfd < 0) {
+            mirror_log(run->loginfo, V_ERR, "unable to receive connection");
+            goto error;
+        }
+
+        /* Read handshake from port connection.
+         */
+
+        ret = (int)HDread(connfd, &mybuf, H5FD_MIRROR_XMIT_OPEN_SIZE);
+        if (-1 == ret) {
+            mirror_log(run->loginfo, V_ERR, "read:%d", ret);
+            goto error;
+        }
+        mirror_log(run->loginfo, V_INFO, "received %d bytes", ret);
+        mirror_log(run->loginfo, V_ALL, "```");
+        mirror_log_bytes(run->loginfo, V_ALL, ret,
+                (const unsigned char *)mybuf);
+        mirror_log(run->loginfo, V_ALL, "```");
+
+        /* Respond to handshake message.
+         */
+
+        if (!HDstrncmp("SHUTDOWN", mybuf, 8)) {
+            /* Stop operation if told to stop */
+            mirror_log(run->loginfo, V_INFO, "received SHUTDOWN!", ret);
+            HDclose(connfd);
+            connfd = -1;
+            goto done;
+        } /* end if explicit "SHUTDOWN" directive */
+        else
+        if (H5FD_MIRROR_XMIT_OPEN_SIZE == ret) {
+            H5FD_mirror_xmit_open_t xopen;
+
+            mirror_log(run->loginfo, V_INFO,
+                     "probable OPEN xmit received");
+
+            H5FD_mirror_xmit_decode_open(&xopen, (const unsigned char *)mybuf);
+            if (FALSE == H5FD_mirror_xmit_is_open(&xopen)) {
+                mirror_log(run->loginfo, V_WARN,
+                         "expected OPEN xmit was malformed");
+                HDclose(connfd);
+                continue;
+            }
+
+            mirror_log(run->loginfo, V_INFO,
+                     "probable OPEN xmit confirmed");
+
+            pid = HDfork();
+            if (pid < 0) { /* fork error */
+                mirror_log(run->loginfo, V_ERR, "cannot fork");
+                goto error;
+            } /* end if fork error */
+            else
+            if (pid == 0) { /* child process (writer side of fork) */
+                mirror_log(run->loginfo, V_INFO,
+                         "executing writer");
+                if (run_writer(connfd, &xopen) < 0) {
+                    HDprintf("can't run writer\n");
+                }
+                else {
+                    HDprintf("writer OK\n");
+                }
+                HDclose(connfd);
+
+                HDexit(EXIT_SUCCESS);
+            } /* end if writer side of fork */
+            else { /* parent process (server side of fork) */
+                mirror_log(run->loginfo, V_INFO, "tidying up from handshake");
+                HDclose(connfd);
+            } /* end if server side of fork */
+
+        } /* end else-if valid request for service */
+        else {
+            /* Ignore unrecognized messages */
+            HDclose(connfd);
+            continue;
+        } /* end else (not a valid message, to be ignored) */
+
+    } /* end while listening for new connections */
+
+done:
+    if (connfd >= 0) {
+        mirror_log(run->loginfo, V_WARN, "connfd still open upon cleanup");
+        HDclose(connfd);
+    }
+
+    return ret_value;
+
+error:
+    if (connfd >= 0) {
+        HDclose(connfd);
+    }
+    return -1;
+} /* end handle_requests() */
+
+
+/* ------------------------------------------------------------------------- */
+int
+main(int argc, char **argv)
+{
+    struct server_run  *run;
+
+    run = init_server_run(argc, argv);
+    if (NULL == run) {
+        mirror_log(NULL, V_ERR, "can't initialize run");
+        HDexit(EXIT_FAILURE);
+    }
+
+    if (handle_requests(run) < 0) {
+        mirror_log(run->loginfo, V_ERR, "problem handling requests");
+    }
+
+    if (term_server_run(run) < 0) {
+        mirror_log(NULL, V_ERR, "problem closing server run");
+        HDexit(EXIT_FAILURE);
+    }
+
+    HDexit(EXIT_SUCCESS);
+} /* end main() */
+
+#else /* H5_HAVE_MIRROR_VFD */
+
+int
+main(void)
+{
+    HDprintf("Mirror VFD was not built -- cannot launch server.\n");
+    HDexit(EXIT_FAILURE);
+}
+
+#endif /* H5_HAVE_MIRROR_VFD */
+
diff --git a/utils/mirror_vfd/mirror_server_stop.c b/utils/mirror_vfd/mirror_server_stop.c
new file mode 100644
index 0000000..f2414e0
--- /dev/null
+++ b/utils/mirror_vfd/mirror_server_stop.c
@@ -0,0 +1,214 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Purpose:     Stop the mirror server
+ *              Exists for cross-platform, optionally remote shutdown.
+ */
+
+#include "H5private.h" /* System compatability call-wrapper macros */
+
+#ifdef H5_HAVE_MIRROR_VFD
+
+#define MSHS_OPTS_MAGIC 0x613B1C15u /* sanity-checking constant */
+#define MSHS_IP_STR_SIZE 20
+#define MSHS_DEFAULT_IP "127.0.0.1"
+#define MSHS_DEFAULT_PORTNO 3000
+
+
+/* ----------------------------------------------------------------------------
+ * Structure:   struct mshs_opts
+ *
+ * Purpose:     Convenience structure to hold options as parsed from the
+ *              command line.
+ *
+ * `magic` (uint32_t)
+ *      Semi-unique constant to help verify pointer integrity.
+ *
+ * `help` (int)
+ *      Flag that the help argument was present.
+ *
+ * `portno` (int)
+ *      Port number, as received from arguments.
+ *
+ * `ip` (char *)
+ *      IP address string as received from arguments.
+ *
+ * ----------------------------------------------------------------------------
+ */
+struct mshs_opts {
+    uint32_t    magic;
+    int         help;
+    int         portno;
+    char        ip[MSHS_IP_STR_SIZE + 1];
+};
+
+
+/* ----------------------------------------------------------------------------
+ * Function:    usage
+ *
+ * Purpose:     Print usage message to stdout.
+ * ----------------------------------------------------------------------------
+ */
+static void
+usage(void)
+{
+    HDprintf("mirror_server_halten_sie [options]\n"                           \
+             "System-independent Mirror Server shutdown program.\n"           \
+             "Sends shutdown message to Mirror Server at given IP:port\n"     \
+             "\n"                                                             \
+             "Options:\n"                                                     \
+             "    -h | --help Print this usage message and exit.\n"           \
+             "    --ip=ADDR   IP Address of remote server (defaut %s)\n"      \
+             "    --port=PORT Handshake port of remote server (default %d)\n",
+             MSHS_DEFAULT_IP,
+             MSHS_DEFAULT_PORTNO);
+} /* end usage() */
+
+
+/* ----------------------------------------------------------------------------
+ * Function:    parse_args
+ *
+ * Purpose:     Parse command-line arguments, populating the options struct
+ *              pointer as appropriate.
+ *              Default values will be set for unspecified options.
+ *
+ * Return:      0 on success, negative (-1) if error.
+ * ----------------------------------------------------------------------------
+ */
+static int
+parse_args(int argc, char **argv, struct mshs_opts *opts)
+{
+    int i = 0;
+
+    opts->magic = MSHS_OPTS_MAGIC;
+    opts->help = 0;
+    opts->portno = MSHS_DEFAULT_PORTNO;
+    HDstrncpy(opts->ip, MSHS_DEFAULT_IP, MSHS_IP_STR_SIZE);
+
+    for (i=1; i < argc; i++) { /* start with first possible option argument */
+        if (!HDstrncmp(argv[i], "-h", 3) || !HDstrncmp(argv[i], "--help", 7)) {
+            opts->help = 1;
+        }
+        else
+        if (!HDstrncmp(argv[i], "--ip=", 5)) {
+            HDstrncpy(opts->ip, argv[i]+5, MSHS_IP_STR_SIZE);
+        }
+        else
+        if (!HDstrncmp(argv[i], "--port=", 7)) {
+            opts->portno = HDatoi(argv[i]+7);
+        }
+        else {
+            HDprintf("Unrecognized option: '%s'\n", argv[i]);
+            usage();
+            opts->magic++; /* invalidate for sanity */
+            return -1;
+        }
+    } /* end for each argument from command line */
+
+    /* auto-replace 'localhost' with numeric IP */
+    if (!HDstrncmp(opts->ip, "localhost", 10)) { /* include null terminator */
+        HDstrncpy(opts->ip, "127.0.0.1", MSHS_IP_STR_SIZE);
+    }
+
+    return 0;
+} /* end parse_args() */
+
+
+/* ----------------------------------------------------------------------------
+ * Function:    send_shutdown
+ *
+ * Purpose:     Create socket and send shutdown signal to remote server.
+ *
+ * Return:      0 on success, negative (-1) if error.
+ * ----------------------------------------------------------------------------
+ */
+static int
+send_shutdown(struct mshs_opts *opts)
+{
+    int                live_socket;
+    struct sockaddr_in target_addr;
+
+    if (opts->magic != MSHS_OPTS_MAGIC) {
+       HDprintf("invalid options structure\n");
+       return -1;
+    }
+
+    live_socket = HDsocket(AF_INET, SOCK_STREAM, 0);
+    if (live_socket < 0) {
+        HDprintf("ERROR socket()\n");
+        return -1;
+    }
+
+    target_addr.sin_family = AF_INET;
+    target_addr.sin_port = HDhtons((uint16_t)opts->portno);
+    target_addr.sin_addr.s_addr = HDinet_addr(opts->ip);
+    HDmemset(target_addr.sin_zero, '\0', sizeof(target_addr.sin_zero));
+
+    if (HDconnect(live_socket, (struct sockaddr *)&target_addr,
+            (socklen_t)sizeof(target_addr))
+        < 0)
+    {
+        HDprintf("ERROR connect() (%d)\n%s\n", errno, HDstrerror(errno));
+        return -1;
+    }
+
+    if (HDwrite(live_socket, "SHUTDOWN", 9) == -1) {
+        HDprintf("ERROR write() (%d)\n%s\n", errno, HDstrerror(errno));
+        return -1;
+    }
+
+    if (HDclose(live_socket) < 0) {
+        HDprintf("ERROR close() can't close socket\n");
+        return -1;
+    }
+
+    return 0;
+} /* end send_shutdown() */
+
+
+/* ------------------------------------------------------------------------- */
+int
+main(int argc, char **argv)
+{
+    struct mshs_opts opts;
+
+    if (parse_args(argc, argv, &opts) < 0) {
+        HDprintf("Unable to parse arguments\n");
+        HDexit(EXIT_FAILURE);
+    }
+
+    if (opts.help) {
+        usage();
+        HDexit(EXIT_FAILURE);
+    }
+
+    if (send_shutdown(&opts) < 0) {
+        HDprintf("Unable to send shutdown command\n");
+        HDexit(EXIT_FAILURE);
+    }
+
+    HDexit(EXIT_SUCCESS);
+} /* end main() */
+
+#else /* H5_HAVE_MIRROR_VFD */
+
+
+/* ------------------------------------------------------------------------- */
+int
+main(void)
+{
+    HDprintf("Mirror VFD not built -- unable to perform shutdown.\n");
+    HDexit(EXIT_FAILURE);
+}
+
+#endif /* H5_HAVE_MIRROR_VFD */
diff --git a/utils/mirror_vfd/mirror_writer.c b/utils/mirror_vfd/mirror_writer.c
new file mode 100644
index 0000000..e1ab1b2
--- /dev/null
+++ b/utils/mirror_vfd/mirror_writer.c
@@ -0,0 +1,1103 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Remote writer process for the mirror (socket) VFD.
+ *
+ * Writer is started with arguments for slaved port.
+ * Awaits a connection on the socket.
+ * Handles instructions from the master 'Driver' process.
+ *
+ * Current implementation uses Sec2 as the underlying driver when opening a
+ * file. This is reflected in the source (H5FDmirror.c) of the Mirror driver.
+ */
+
+#include "mirror_remote.h"
+
+#ifdef H5_HAVE_MIRROR_VFD
+
+#define HEXDUMP_XMITS 1           /* Toggle whether to print xmit bytes-blob */
+                                  /* in detailed logging  */
+#define HEXDUMP_WRITEDATA 0       /* Toggle whether to print bytes to write */
+                                  /* in detailed logging  */
+#define LISTENQ 80                /* max pending Driver requests */
+
+#define MW_SESSION_MAGIC        0x88F36B32u
+#define MW_SOCK_COMM_MAGIC      0xDF10A157u
+#define MW_OPTS_MAGIC   0x3BA8B462u
+
+
+/* ---------------------------------------------------------------------------
+ * Structure: struct mirror_session
+ *
+ * Bundle of information used to manage the operation of this remote Writer
+ * in a "session" with the Driver process.
+ *
+ * magic (uint32_t)
+ *       Semi-unique "magic" number used to sanity-check a structure for
+ *       validity. MUST equal MW_SESSION_MAGIC to be valid.
+ *
+ * sockfd (int)
+ *       File descriptor to the socket.
+ *       Used for receiving bytes from and writing bytes to the Driver
+ *       across the network.
+ *       If not NULL, should be a valid descriptor.
+ *
+ * token (uint32t)
+ *      Number used to help sanity-check received transmission from the Writer.
+ *      Each Driver/Writer pairing should have a semi-unique "token" to help
+ *      guard against commands from the wrong entity.
+ *
+ * xmit_count (uint32_t)
+ *      Record of trasmissions received from the Driver. While the transmission
+ *      protocol should be trustworthy, this serves as an additional guard.
+ *      Starts a 0 and should be incremented for each one-way transmission.
+ *
+ * file (H5FD_t *)
+ *      Virtual File handle for the hdf5 file.
+ *      Set on file open if H5Fopen() is successful. If NULL, it is invalid.
+ *
+ * log_verbosity (unsigned int)
+ *      The verbosity level for logging. Should be set to one of the values
+ *      defined at the top of this file.
+ *
+ * log_stream (FILE *)
+ *      File pointer to which logging output is written. Starts (and ends)
+ *      with a default stream, such as stdout, but can be overridden at
+ *      runtime.
+ *
+ * reply (H5FD_mirror_xmit_reply_t)
+ *      Structure space for persistent reply data.
+ *      Should be initialized with basic header info (magic, version, op),
+ *      then with session info (token, xmit count), and finally with specific
+ *      reply info (update xmit_count, status code, and message) before
+ *      transmission.
+ *
+ * ----------------------------------------------------------------------------
+ */
+struct mirror_session {
+    uint32_t                  magic;
+    int                       sockfd;
+    uint32_t                  token;
+    uint32_t                  xmit_count;
+    H5FD_t                   *file;
+    loginfo_t                *loginfo;
+    H5FD_mirror_xmit_reply_t  reply;
+};
+
+
+/* ---------------------------------------------------------------------------
+ * Structure: struct sock_comm
+ *
+ * Structure for placing the data read and pre-processed from Driver in an
+ * organized fashion. Useful for pre-processing a received xmit.
+ *
+ * magic (uint32_t)
+ *      Semi-unique number to sanity-check structure pointer and validity.
+ *      Must equal MW_SOCK_COMM_MAGIC to be valid.
+ *
+ * recd_die (int)
+ *      "Boolean" flag indicating that an explicit shutdown/kill/die command
+ *      was received. Potentially useful for debugging and or "manual"
+ *      operation of the program.
+ *      0 indicates normal operation, non-0 (1) indicates to die.
+ *
+ * xmit_recd (H5FD_mirror_xmit_t *)
+ *      Structure pointer for the "xmit header" as decoded from the raw
+ *      binary stream read from the socket.
+ *
+ * raw (char *)
+ *      Pointer to a raw byte array, for storing data as read from the
+ *      socket. Bytes buffer is decoded into xmit_t header and derivative
+ *      structures.
+ *
+ * raw_size (size_t)
+ *      Give the size of the `raw` buffer.
+ *
+ * ---------------------------------------------------------------------------
+ */
+struct sock_comm {
+    uint32_t            magic;
+    int                 recd_die;
+    H5FD_mirror_xmit_t *xmit_recd;
+    char               *raw;
+    size_t              raw_size;
+};
+
+
+/* ---------------------------------------------------------------------------
+ * Structure: struct mirror_writer_opts
+ *
+ * Container for default values and options as parsed from the command line.
+ * Currently rather vestigal, but may be expanded and/or moved to be set by
+ * Server and passed around as an argument.
+ *
+ * magic (uint32_t)
+ *      Semi-unique number to sanity-check structure pointer and validity.
+ *      Must equal MW_OPTS_MAGIC to be valid.
+ *
+ * logpath (char *)
+ *      String pointer. Allocated at runtime.
+ *      Specifies file location for logging output.
+ *      May be NULL -- uses default output (e.g., stdout).
+ *
+ * ----------------------------------------------------------------------------
+ */
+struct mirror_writer_opts {
+    uint32_t    magic;
+    char       *logpath;
+};
+
+static void mybzero(void *dest, size_t size);
+
+static int do_open(struct mirror_session *session,
+        const H5FD_mirror_xmit_open_t *xmit_open);
+
+
+/* ---------------------------------------------------------------------------
+ * Function:   mybzero
+ *
+ * Purpose:    Introduce bzero without neededing it on the system.
+ *
+ * Programmer: Jacob Smith
+ *             2020-03-30
+ * ---------------------------------------------------------------------------
+ */
+static void mybzero(void *dest, size_t size)
+{
+    size_t i = 0;
+    char *s = NULL;
+    HDassert(dest);
+    s = (char *)dest;
+    for (i = 0; i < size; i++) {
+        *(s+i) = 0;
+    }
+} /* end mybzero() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    session_init
+ *
+ * Purpose:     Populate mirror_session structure with default and
+ *              options-drived values.
+ *
+ * Return:      An allocated mirror_session structure pointer on success,
+ *              else NULL.
+ * ----------------------------------------------------------------------------
+ */
+static struct mirror_session *
+session_init(struct mirror_writer_opts *opts)
+{
+    struct mirror_session *session = NULL;
+
+    mirror_log(NULL, V_INFO, "session_init()");
+
+    if (NULL == opts || opts->magic != MW_OPTS_MAGIC) {
+        mirror_log(NULL, V_ERR, "invalid opts pointer");
+        goto error;
+    }
+
+    session = (struct mirror_session *)HDmalloc(sizeof(struct mirror_session));
+    if (session == NULL) {
+        mirror_log(NULL, V_ERR, "can't allocate session structure");
+        goto error;
+    }
+
+    session->magic         = MW_SESSION_MAGIC;
+    session->sockfd        = -1;
+    session->xmit_count    = 0;
+    session->token         = 0;
+    session->file          = NULL;
+
+    session->reply.pub.magic         = H5FD_MIRROR_XMIT_MAGIC;
+    session->reply.pub.version       = H5FD_MIRROR_XMIT_CURR_VERSION;
+    session->reply.pub.op            = H5FD_MIRROR_OP_REPLY;
+    session->reply.pub.session_token = 0;
+    mybzero(session->reply.message, H5FD_MIRROR_STATUS_MESSAGE_MAX);
+
+    /* Options-derived population
+     */
+
+    session->loginfo = mirror_log_init(opts->logpath, "W- ",
+            MIRROR_LOG_DEFAULT_VERBOSITY);
+
+    return session;
+
+error:
+    if (session) {
+        HDfree(session);
+    }
+    return NULL;
+} /* end session_init() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    session_stop
+ *
+ * Purpose:     Stop and clean up a session.
+ *              Only do this as part of program termination or aborting startup.
+ *
+ * Return:      0 on success, or negative sum of errors encountered.
+ * ----------------------------------------------------------------------------
+ */
+static int
+session_stop(struct mirror_session *session)
+{
+    int ret_value = 0;
+
+    HDassert(session && (session->magic == MW_SESSION_MAGIC));
+
+    mirror_log(session->loginfo, V_INFO, "session_stop()");
+
+    /* Close HDF5 file if it is still open (probably in error) */
+    if (session->file) {
+        mirror_log(session->loginfo, V_WARN, "HDF5 file still open at cleanup");
+        if (H5FDclose(session->file) < 0) {
+            mirror_log(session->loginfo, V_ERR, "H5FDclose() during cleanup!");
+            ret_value--;
+        }
+    }
+
+    /* Socket will be closed by parent side of server fork after exit */
+
+    /* Close custom logging stream */
+    if (mirror_log_term(session->loginfo) < 0) {
+        mirror_log(NULL, V_ERR, "Problem closing logging stream");
+        ret_value--;
+    }
+    session->loginfo = NULL;
+
+    /* Invalidate and release structure */
+    session->magic++;
+    HDfree(session);
+
+    return ret_value;
+} /* end session_stop() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    session_start
+ *
+ * Purpose:     Initiate session, open files.
+ *
+ * Return:      Success: A valid mirror_session pointer which must later be
+ *                       cleaned up with session_stop().
+ *              Failure: NULL, after cleaning up after itself.
+ * ---------------------------------------------------------------------------
+ */
+static struct mirror_session *
+session_start(int socketfd, const H5FD_mirror_xmit_open_t *xmit_open)
+{
+    struct mirror_session *session = NULL;
+    struct mirror_writer_opts opts;
+#if 0 /* TODO: behaviro option */
+    char logpath[H5FD_MIRROR_XMIT_FILEPATH_MAX] = "";
+#endif
+
+    mirror_log(NULL, V_INFO, "session_start()");
+
+    if (FALSE == H5FD_mirror_xmit_is_open(xmit_open)) {
+        mirror_log(NULL, V_ERR, "invalid OPEN xmit");
+        return NULL;
+    }
+
+    opts.magic = MW_OPTS_MAGIC;
+#if 0 /* TODO: behavior option */
+    HDsnprintf(logpath, H5FD_MIRROR_XMIT_FILEPATH_MAX, "%s.log",
+            xmit_open->filename);
+    opts.logpath = logpath;
+#else
+    opts.logpath = NULL;
+#endif
+
+    session = session_init(&opts);
+    if (NULL == session) {
+        mirror_log(NULL, V_ERR, "can't instantiate session");
+        goto error;
+    }
+
+    session->sockfd = socketfd;
+
+    if (do_open(session, xmit_open) < 0) {
+        mirror_log(NULL, V_ERR, "unable to open file");
+        goto error;
+    }
+
+    return session;
+
+error:
+    if (session != NULL) {
+        if (session_stop(session) < 0) {
+            mirror_log(NULL, V_WARN, "Can't abort session init");
+        }
+        session = NULL;
+    }
+    return NULL;
+}
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    _xmit_reply
+ *
+ * Purpose:     Common operations to send a reply xmit through the session.
+ *
+ * Return:      0 on success, -1 if error.
+ * ----------------------------------------------------------------------------
+ */
+static int
+_xmit_reply(struct mirror_session *session)
+{
+    unsigned char             xmit_buf[H5FD_MIRROR_XMIT_REPLY_SIZE];
+    H5FD_mirror_xmit_reply_t *reply = &(session->reply);
+
+    HDassert(session && (session->magic == MW_SESSION_MAGIC));
+
+    mirror_log(session->loginfo, V_ALL, "_xmit_reply()");
+
+    reply->pub.xmit_count = session->xmit_count++;
+    if (H5FD_mirror_xmit_encode_reply(xmit_buf,
+            (const H5FD_mirror_xmit_reply_t *)reply)
+        != H5FD_MIRROR_XMIT_REPLY_SIZE)
+    {
+        mirror_log(session->loginfo, V_ERR, "can't encode reply");
+        return -1;
+    }
+
+    mirror_log(session->loginfo, V_ALL, "reply xmit data\n```");
+    mirror_log_bytes(session->loginfo, V_ALL, H5FD_MIRROR_XMIT_REPLY_SIZE,
+            (const unsigned char *)xmit_buf);
+    mirror_log(session->loginfo, V_ALL, "```");
+
+    if (HDwrite(session->sockfd, xmit_buf, H5FD_MIRROR_XMIT_REPLY_SIZE) < 0) {
+        mirror_log(session->loginfo, V_ERR, "can't write reply to Driver");
+        return -1;
+    }
+
+    return 0;
+} /* end _xmit_reply() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    reply_ok
+ *
+ * Purpose:     Send an OK reply through the session.
+ *
+ * Return:      0 on success, -1 if error.
+ * ---------------------------------------------------------------------------
+ */
+static int
+reply_ok(struct mirror_session *session)
+{
+    H5FD_mirror_xmit_reply_t *reply = &(session->reply);
+
+    HDassert(session && (session->magic == MW_SESSION_MAGIC));
+
+    mirror_log(session->loginfo, V_ALL, "reply_ok()");
+
+    reply->status = H5FD_MIRROR_STATUS_OK;
+    mybzero(reply->message, H5FD_MIRROR_STATUS_MESSAGE_MAX);
+    return _xmit_reply(session);
+} /* end reply_ok() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    reply_error
+ *
+ * Purpose:     Send an ERROR reply with message through the session.
+ *              Message may be cut short if it would overflow the available
+ *              buffer in the xmit.
+ *
+ * Return:      0 on success, -1 if error.
+ * ---------------------------------------------------------------------------
+ */
+static int
+reply_error(struct mirror_session  *session,
+            const char             *msg)
+{
+    H5FD_mirror_xmit_reply_t *reply = &(session->reply);
+
+    HDassert(session && (session->magic == MW_SESSION_MAGIC));
+
+    mirror_log(session->loginfo, V_ALL, "reply_error(%s)", msg);
+
+    reply->status = H5FD_MIRROR_STATUS_ERROR;
+    HDsnprintf(reply->message, H5FD_MIRROR_STATUS_MESSAGE_MAX-1, "%s", msg);
+    return _xmit_reply(session);
+} /* end reply_error() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    do_close
+ *
+ * Purpose:     Handle an CLOSE operation.
+ *
+ * Return:      0 on success, -1 if error.
+ * ---------------------------------------------------------------------------
+ */
+static int
+do_close(struct mirror_session *session)
+{
+
+    HDassert(session && (session->magic == MW_SESSION_MAGIC));
+
+    mirror_log(session->loginfo, V_INFO, "do_close()");
+
+    if (NULL == session->file) {
+        mirror_log(session->loginfo, V_ERR, "no file to close!");
+        reply_error(session, "no file to close");
+        return -1;
+    }
+
+    if (H5FDclose(session->file) < 0) {
+        mirror_log(session->loginfo, V_ERR, "H5FDclose()");
+        reply_error(session, "H5FDclose()");
+        return -1;
+    }
+    session->file = NULL;
+
+    if (reply_ok(session) < 0) {
+        mirror_log(session->loginfo, V_ERR, "can't reply");
+        reply_error(session, "ok reply failed; session contaminated");
+        return -1;
+    }
+
+    return 0;
+} /* end do_close() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    do_lock
+ *
+ * Purpose:     Handle a LOCK operation.
+ *
+ * Return:      0 on success, -1 if error.
+ * ---------------------------------------------------------------------------
+ */
+static int
+do_lock(struct mirror_session  *session,
+        const unsigned char    *xmit_buf)
+{
+    size_t                  decode_ret = 0;
+    H5FD_mirror_xmit_lock_t xmit_lock;
+
+    HDassert(session && (session->magic == MW_SESSION_MAGIC) && xmit_buf);
+
+    mirror_log(session->loginfo, V_INFO, "do_lock()");
+
+    decode_ret = H5FD_mirror_xmit_decode_lock(&xmit_lock, xmit_buf);
+    if (H5FD_MIRROR_XMIT_LOCK_SIZE != decode_ret) {
+        mirror_log(session->loginfo, V_ERR, "can't decode set-eoa xmit");
+        reply_error(session, "remote xmit_eoa_t decoding size failure");
+        return -1;
+    }
+
+    if (!H5FD_mirror_xmit_is_lock(&xmit_lock)) {
+        mirror_log(session->loginfo, V_ERR, "not a set-eoa xmit");
+        reply_error(session, "remote xmit_eoa_t decode failure");
+        return -1;
+    }
+    mirror_log(session->loginfo, V_INFO, "lock rw: (%d)", xmit_lock.rw);
+
+    if (H5FDlock(session->file, (hbool_t)xmit_lock.rw) < 0) {
+        mirror_log(session->loginfo, V_ERR, "H5FDlock()");
+        reply_error(session, "remote H5FDlock() failure");
+        return -1;
+    }
+
+    if (reply_ok(session) < 0) {
+        mirror_log(session->loginfo, V_ERR, "can't reply");
+        reply_error(session, "ok reply failed; session contaminated");
+        return -1;
+    }
+
+    return 0;
+} /* end do_lock() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    do_open
+ *
+ * Purpose:     Handle an OPEN operation.
+ *
+ * Return:      0 on success, -1 if error.
+ * ---------------------------------------------------------------------------
+ */
+static int
+do_open(struct mirror_session  *session,
+        const H5FD_mirror_xmit_open_t *xmit_open)
+{
+    hid_t fapl_id = H5I_INVALID_HID;
+    unsigned _flags = 0;
+    haddr_t _maxaddr = HADDR_UNDEF;
+
+    HDassert(session && (session->magic == MW_SESSION_MAGIC) && xmit_open &&
+             TRUE == H5FD_mirror_xmit_is_open(xmit_open));
+
+    mirror_log(session->loginfo, V_INFO, "do_open()");
+
+    if (0 != xmit_open->pub.xmit_count) {
+        mirror_log(session->loginfo, V_ERR, "open with xmit count not zero!");
+        reply_error(session, "initial transmission count not zero");
+        goto error;
+    }
+    if (0 != session->token) {
+        mirror_log(session->loginfo, V_ERR, "open with token already set!");
+        reply_error(session, "initial session token not zero");
+        goto error;
+    }
+
+    session->xmit_count = 1;
+    session->token = xmit_open->pub.session_token;
+    session->reply.pub.session_token = session->token;
+
+    _flags = (unsigned)xmit_open->flags;
+    _maxaddr = (haddr_t)xmit_open->maxaddr;
+
+    /* Check whether the native size_t on the remote machine (Driver) is larger
+     * than that on the local machine; if so, issue a warning.
+     * The blob is always an 8-byte bitfield -- check its contents.
+     */
+    if (xmit_open->size_t_blob > (uint64_t)((size_t)(-1))) {
+        mirror_log(session->loginfo, V_WARN,
+            "Driver size_t is larger than our own");
+    }
+
+    mirror_log(session->loginfo, V_INFO,
+            "to open file %s (flags %d) (maxaddr %d)",
+            xmit_open->filename, _flags, _maxaddr);
+
+    /* Explicitly use Sec2 as the underlying driver for now.
+     */
+    fapl_id = H5Pcreate(H5P_FILE_ACCESS);
+    if (fapl_id < 0) {
+        mirror_log(session->loginfo, V_ERR, "can't create FAPL");
+        reply_error(session, "H5Pcreate() failure");
+        goto error;
+    }
+    if (H5Pset_fapl_sec2(fapl_id) < 0) {
+        mirror_log(session->loginfo, V_ERR, "can't set FAPL as Sec2");
+        reply_error(session, "H5Pset_fapl_sec2() failure");
+        goto error;
+    }
+
+    session->file = H5FDopen(xmit_open->filename, _flags, fapl_id, _maxaddr);
+    if (NULL == session->file) {
+        mirror_log(session->loginfo, V_ERR, "H5FDopen()");
+        reply_error(session, "remote H5FDopen() failure");
+        goto error;
+    }
+
+    /* FAPL is set and in use; clean up */
+    if (H5Pclose(fapl_id) < 0) {
+        mirror_log(session->loginfo, V_ERR, "can't set FAPL as Sec2");
+        reply_error(session, "H5Pset_fapl_sec2() failure");
+        goto error;
+    }
+
+    if (reply_ok(session) < 0) {
+        mirror_log(session->loginfo, V_ERR, "can't reply");
+        reply_error(session, "ok reply failed; session contaminated");
+        return -1;
+    }
+
+    return 0;
+
+error:
+    if (fapl_id > 0) {
+        H5E_BEGIN_TRY {
+            (void)H5Pclose(fapl_id);
+        } H5E_END_TRY;
+    }
+    return -1;
+} /* end do_open() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    do_set_eoa
+ *
+ * Purpose:     Handle a SET_EOA operation.
+ *
+ * Return:      0 on success, -1 if error.
+ * ---------------------------------------------------------------------------
+ */
+static int
+do_set_eoa(struct mirror_session  *session,
+           const unsigned char    *xmit_buf)
+{
+    size_t                 decode_ret = 0;
+    H5FD_mirror_xmit_eoa_t xmit_seoa;
+
+    HDassert(session && (session->magic == MW_SESSION_MAGIC) && xmit_buf);
+
+    mirror_log(session->loginfo, V_INFO, "do_set_eoa()");
+
+    decode_ret = H5FD_mirror_xmit_decode_set_eoa(&xmit_seoa, xmit_buf);
+    if (H5FD_MIRROR_XMIT_EOA_SIZE != decode_ret) {
+        mirror_log(session->loginfo, V_ERR, "can't decode set-eoa xmit");
+        reply_error(session, "remote xmit_eoa_t decoding size failure");
+        return -1;
+    }
+
+    if (!H5FD_mirror_xmit_is_set_eoa(&xmit_seoa)) {
+        mirror_log(session->loginfo, V_ERR, "not a set-eoa xmit");
+        reply_error(session, "remote xmit_eoa_t decode failure");
+        return -1;
+    }
+
+    mirror_log(session->loginfo, V_INFO, "set EOA addr %d",
+            xmit_seoa.eoa_addr);
+
+    if (H5FDset_eoa(session->file, (H5FD_mem_t)xmit_seoa.type,
+            (haddr_t)xmit_seoa.eoa_addr)
+        < 0)
+    {
+        mirror_log(session->loginfo, V_ERR, "H5FDset_eoa()");
+        reply_error(session, "remote H5FDset_eoa() failure");
+        return -1;
+    }
+
+    if (reply_ok(session) < 0) {
+        mirror_log(session->loginfo, V_ERR, "can't reply");
+        reply_error(session, "ok reply failed; session contaminated");
+        return -1;
+    }
+
+    return 0;
+} /* end do_set_eoa() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    do_truncate
+ *
+ * Purpose:     Handle a TRUNCATE operation.
+ *
+ * Return:      0 on success, -1 if error.
+ * ---------------------------------------------------------------------------
+ */
+static int
+do_truncate(struct mirror_session  *session)
+{
+
+    HDassert(session && (session->magic == MW_SESSION_MAGIC));
+
+    mirror_log(session->loginfo, V_INFO, "do_truncate()");
+
+    /* default DXPL ID (0), 0 for "FALSE" closing -- both probably unused */
+    if (H5FDtruncate(session->file, 0, 0) < 0) {
+        mirror_log(session->loginfo, V_ERR, "H5FDtruncate()");
+        reply_error(session, "remote H5FDtruncate() failure");
+        return -1;
+    }
+
+    if (reply_ok(session) < 0) {
+        mirror_log(session->loginfo, V_ERR, "can't reply");
+        reply_error(session, "ok reply failed; session contaminated");
+        return -1;
+    }
+
+    return 0;
+} /* end do_truncate() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    do_unlock
+ *
+ * Purpose:     Handle an UNLOCK operation.
+ *
+ * Return:      0 on success, -1 if error.
+ * ---------------------------------------------------------------------------
+ */
+static int
+do_unlock(struct mirror_session  *session)
+{
+    HDassert(session && (session->magic == MW_SESSION_MAGIC));
+
+    mirror_log(session->loginfo, V_INFO, "do_unlock()");
+
+    if (H5FDunlock(session->file) < 0) {
+        mirror_log(session->loginfo, V_ERR, "H5FDunlock()");
+        reply_error(session, "remote H5FDunlock() failure");
+        return -1;
+    }
+
+    if (reply_ok(session) < 0) {
+        mirror_log(session->loginfo, V_ERR, "can't reply");
+        reply_error(session, "ok reply failed; session contaminated");
+        return -1;
+    }
+
+    return 0;
+} /* end do_unlock() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    do_write
+ *
+ * Purpose:     Handle a WRITE operation.
+ *              Receives command, replies; receives & writes data, replies.
+ *
+ *              It is known that this results in suboptimal performance,
+ *              but handling both small and very, very large write buffers
+ *              with a single "over the wire" exchange
+ *              poses design challenges not worth tackling as of March 2020.
+ *
+ * Return:      0 on success, -1 if error.
+ * ---------------------------------------------------------------------------
+ */
+static int
+do_write(struct mirror_session  *session,
+         const unsigned char    *xmit_buf)
+{
+    size_t      decode_ret        = 0;
+    haddr_t     addr              = 0;
+    haddr_t     sum_bytes_written = 0;
+    H5FD_mem_t  type              = 0;
+    char       *buf               = NULL;
+    ssize_t     nbytes_in_packet  = 0;
+    H5FD_mirror_xmit_write_t xmit_write;
+
+    HDassert(session && (session->magic == MW_SESSION_MAGIC) && xmit_buf);
+
+    mirror_log(session->loginfo, V_INFO, "do_write()");
+
+    if (NULL == session->file) {
+        mirror_log(session->loginfo, V_ERR, "no open file!");
+        reply_error(session, "no file open on remote");
+        return -1;
+    }
+
+    decode_ret = H5FD_mirror_xmit_decode_write(&xmit_write, xmit_buf);
+    if (H5FD_MIRROR_XMIT_WRITE_SIZE != decode_ret) {
+        mirror_log(session->loginfo, V_ERR, "can't decode write xmit");
+        reply_error(session, "remote xmit_write_t decoding size failure");
+        return -1;
+    }
+
+    if (!H5FD_mirror_xmit_is_write(&xmit_write)) {
+        mirror_log(session->loginfo, V_ERR, "not a write xmit");
+        reply_error(session, "remote xmit_write_t decode failure");
+        return -1;
+    }
+
+    addr = (haddr_t)xmit_write.offset;
+    type = (H5FD_mem_t)xmit_write.type;
+
+    /* Allocate the buffer once -- re-use between loops.
+     */
+    buf = (char *)HDmalloc(sizeof(char) * H5FD_MIRROR_DATA_BUFFER_MAX);
+    if (NULL == buf) {
+        mirror_log(session->loginfo, V_ERR, "can't allocate databuffer");
+        reply_error(session, "can't allocate buffer for receiving data");
+        return -1;
+    }
+
+    /* got write signal; ready for data */
+    if (reply_ok(session) < 0) {
+        mirror_log(session->loginfo, V_ERR, "can't reply");
+        reply_error(session, "ok reply failed; session contaminated");
+        return -1;
+    }
+
+    mirror_log(session->loginfo, V_INFO, "to write %zu bytes at %zu",
+            xmit_write.size,
+            addr);
+
+    /* The given write may be:
+     * 1. larger than the allowed single buffer size
+     * 2. larger than the native size_t of this system
+     *
+     * Handle all cases by looping, ingesting as much of the stream as possible
+     * and writing that part to the file.
+     */
+    sum_bytes_written = 0;
+    do {
+        nbytes_in_packet = HDread(session->sockfd, buf,
+                H5FD_MIRROR_DATA_BUFFER_MAX);
+        if (-1 == nbytes_in_packet) {
+            mirror_log(session->loginfo, V_ERR, "can't read into databuffer");
+            reply_error(session, "can't read data buffer");
+            return -1;
+        }
+
+        mirror_log(session->loginfo, V_INFO, "received %zd bytes",
+            nbytes_in_packet);
+        if (HEXDUMP_WRITEDATA) {
+            mirror_log(session->loginfo, V_ALL, "DATA:\n```");
+            mirror_log_bytes(session->loginfo, V_ALL, nbytes_in_packet,
+                    (const unsigned char *)buf);
+            mirror_log(session->loginfo, V_ALL, "```");
+        }
+
+        mirror_log(session->loginfo, V_INFO, "writing %zd bytes at %zu",
+                 nbytes_in_packet,
+                 (addr + sum_bytes_written));
+
+        if (H5FDwrite(session->file, type, H5P_DEFAULT,
+                (addr + sum_bytes_written), (size_t)nbytes_in_packet, buf)
+            < 0)
+        {
+            mirror_log(session->loginfo, V_ERR, "H5FDwrite()");
+            reply_error(session, "remote H5FDwrite() failure");
+            return -1;
+        }
+
+        sum_bytes_written += (haddr_t)nbytes_in_packet;
+
+    } while (sum_bytes_written < xmit_write.size); /* end while ingesting */
+
+    HDfree(buf);
+
+    /* signal that we're done here and a-ok */
+    if (reply_ok(session) < 0) {
+        mirror_log(session->loginfo, V_ERR, "can't reply");
+        reply_error(session, "ok reply failed; session contaminated");
+        return -1;
+    }
+
+    return 0;
+} /* end do_write() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    receive_communique
+ *
+ * Purpose:     Accept bytes from the socket, check for emergency shutdown, and
+ *              sanity-check received bytes.
+ *              The raw bytes read are stored in the sock_comm structure at
+ *              comm->raw.
+ *              The raw bytes are decoded and a xmit_t (header) struct pointer
+ *              in comm is populated at comm->xmit_recd.
+ *
+ * Return:      0 on success, -1 if error.
+ * ---------------------------------------------------------------------------
+ */
+static int
+receive_communique(
+        struct mirror_session  *session,
+        struct sock_comm       *comm)
+{
+    ssize_t     read_ret = 0;
+    size_t      decode_ret;
+    H5FD_mirror_xmit_t *X = comm->xmit_recd;
+
+    HDassert((session != NULL)                    && \
+             (session->magic == MW_SESSION_MAGIC) && \
+             (comm != NULL)                       && \
+             (comm->magic == MW_SOCK_COMM_MAGIC)  && \
+             (comm->xmit_recd != NULL)            && \
+             (comm->raw != NULL)                  && \
+             (comm->raw_size >= H5FD_MIRROR_XMIT_BUFFER_MAX) );
+
+    mirror_log(session->loginfo, V_INFO, "receive_communique()");
+
+    mybzero(comm->raw, comm->raw_size);
+    comm->recd_die = 0;
+
+    mirror_log(session->loginfo, V_INFO, "ready to receive"); /* TODO */
+
+    read_ret = HDread(session->sockfd, comm->raw, H5FD_MIRROR_XMIT_BUFFER_MAX);
+    if (-1 == read_ret) {
+        mirror_log(session->loginfo, V_ERR, "read:%zd", read_ret);
+        goto error;
+    }
+
+    mirror_log(session->loginfo, V_INFO, "received %zd bytes", read_ret);
+    if (HEXDUMP_XMITS) {
+        mirror_log(session->loginfo, V_ALL, "```", read_ret);
+        mirror_log_bytes(session->loginfo, V_ALL, (size_t)read_ret,
+                (const unsigned char *)comm->raw);
+        mirror_log(session->loginfo, V_ALL, "```");
+    } /* end if hexdump transmissions received */
+
+    /* old-fashioned manual kill (for debugging) */
+    if (!HDstrncmp("GOODBYE", comm->raw, 7)) {
+        mirror_log(session->loginfo, V_INFO, "received GOODBYE");
+        comm->recd_die = 1;
+        goto done;
+    }
+
+    decode_ret = H5FD_mirror_xmit_decode_header(X,
+            (const unsigned char *)comm->raw);
+    if (H5FD_MIRROR_XMIT_HEADER_SIZE != decode_ret) {
+        mirror_log(session->loginfo, V_ERR,
+                "header decode size mismatch: expected (%z), got (%z)",
+                H5FD_MIRROR_XMIT_HEADER_SIZE, decode_ret);
+        /* Try to tell Driver that it should stop */
+        reply_error(session, "xmit size mismatch");
+        goto error;
+    }
+
+    if (!H5FD_mirror_xmit_is_xmit(X)) {
+        mirror_log(session->loginfo, V_ERR, "bad magic: 0x%X", X->magic);
+        /* Try to tell Driver that it should stop */
+        reply_error(session, "bad magic");
+        goto error;
+    }
+
+    if (session->xmit_count != X->xmit_count) {
+        mirror_log(session->loginfo, V_ERR,
+                "xmit_count mismatch exp:%d recd:%d",
+                session->xmit_count, X->xmit_count);
+        /* Try to tell Driver that it should stop */
+        reply_error(session, "xmit_count mismatch");
+        goto error;
+    }
+
+    if ( (session->token > 0) && (session->token != X->session_token) ) {
+        mirror_log(session->loginfo, V_ERR, "wrong session");
+        /* Try to tell Driver that it should stop */
+        reply_error(session, "wrong session");
+        goto error;
+    }
+
+    session->xmit_count++;
+
+done:
+    return 0;
+
+error:
+    return -1;
+} /* end receive_communique() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    process_instructions
+ *
+ * Purpose:     Receive and handle all instructions from Driver.
+ *
+ * Return:      0 on success, -1 if error.
+ * ---------------------------------------------------------------------------
+ */
+static int
+process_instructions(struct mirror_session *session)
+{
+    struct sock_comm    comm;
+    char                xmit_buf[H5FD_MIRROR_XMIT_BUFFER_MAX]; /* raw bytes */
+    H5FD_mirror_xmit_t  xmit_recd; /* for decoded xmit header */
+
+    HDassert(session && (session->magic == MW_SESSION_MAGIC));
+
+    mirror_log(session->loginfo, V_INFO, "process_instructions()");
+
+    comm.magic = MW_SOCK_COMM_MAGIC;
+    comm.recd_die = 0; /* Flag for program to terminate */
+    comm.xmit_recd = &xmit_recd;
+    comm.raw = xmit_buf;
+    comm.raw_size = sizeof(xmit_buf);
+
+    while (1) { /* sill-listening infinite loop */
+
+        /* Use convenience structure for raw/decoded info in/out */
+        if (receive_communique(session, &comm) < 0) {
+            mirror_log(session->loginfo, V_ERR, "problem reading socket");
+            return -1;
+        }
+
+        if (comm.recd_die) {
+            goto done;
+        }
+
+        switch(xmit_recd.op) {
+        case H5FD_MIRROR_OP_CLOSE:
+            if (do_close(session) < 0) {
+                return -1;
+            }
+            goto done;
+        case H5FD_MIRROR_OP_LOCK:
+            if (do_lock(session, (const unsigned char *)xmit_buf) < 0) {
+                return -1;
+            }
+            break;
+        case H5FD_MIRROR_OP_OPEN:
+            mirror_log(session->loginfo, V_ERR, "OPEN xmit during session");
+            reply_error(session, "illegal OPEN xmit during session");
+            return -1;
+        case H5FD_MIRROR_OP_SET_EOA:
+            if (do_set_eoa(session, (const unsigned char *)xmit_buf) < 0) {
+                return -1;
+            }
+            break;
+        case H5FD_MIRROR_OP_TRUNCATE:
+            if (do_truncate(session) < 0) {
+                return -1;
+            }
+            break;
+        case H5FD_MIRROR_OP_UNLOCK:
+            if (do_unlock(session) < 0) {
+                return -1;
+            }
+            break;
+        case H5FD_MIRROR_OP_WRITE:
+            if (do_write(session, (const unsigned char *)xmit_buf) < 0) {
+                return -1;
+            }
+            break;
+        default:
+            mirror_log(session->loginfo, V_ERR, "unrecognized transmission");
+            reply_error(session, "unrecognized transmission");
+            return -1;
+        } /* end switch (xmit_recd.op) */
+
+    } /* end while still listening */
+
+done:
+    comm.magic = 0; /* invalidate structure, on principle */
+    xmit_recd.magic = 0; /* invalidate structure, on principle */
+    return 0;
+} /* end process_instructions() */
+
+
+/* ---------------------------------------------------------------------------
+ * Function:    run_writer
+ *
+ * Purpose:     Initiate Writer operations.
+ *
+ *              Receives as parameters a socket which has accepted the
+ *              connection to the Driver and the OPEN xmit (which must be
+ *              decoded into the structure and verified prior to being passed
+ *              to this function).
+ *
+ *              Is not responsible for closing or cleaning up any of the
+ *              received parameters.
+ *
+ * Return:      Success: SUCCEED
+ *              Failure: FAIL
+ * ---------------------------------------------------------------------------
+ */
+herr_t
+run_writer(int socketfd, H5FD_mirror_xmit_open_t *xmit_open)
+{
+    struct mirror_session *session = NULL;
+    int ret_value = SUCCEED;
+
+    session = session_start(socketfd, xmit_open);
+    if (NULL == session) {
+        mirror_log(NULL, V_ERR, "Can't start session -- aborting");
+        ret_value = FAIL;
+    }
+    else {
+        if (process_instructions(session) < 0) {
+            mirror_log(session->loginfo, V_ERR,
+                    "problem processing instructions");
+            ret_value = FAIL;
+        }
+        if (session_stop(session) < 0) {
+            mirror_log(NULL, V_ERR, "Can't stop session -- going down hard");
+            ret_value = FAIL;
+        }
+    }
+
+    return ret_value;
+} /* end run_writer */
+
+#endif /* H5_HAVE_MIRROR_VFD */
+