Add Splitter VFD to library.

* "Simultaneous and equivalent" Read-Write and Write-Only channels for
  file I/O.
* Only supports drivers with the H5FD_FEAT_DEFAULT_VFD_COMPATIBLE flag for
  now, preventing issues with multi-file drivers.

Add Mirror VFD to library.

* Write-only operations over a network.
* Uses TCP/IP sockets.
* Server and auxiliary server-shutdown programs provided in a new directory,
  `utils/mirror_vfd`.
* Automated testing via loopback ("remote" of localhost).

4 files changed, 27 insertions, 0 deletions

diff --git a/config/cmake/ConfigureChecks.cmake b/config/cmake/ConfigureChecks.cmake
index 11bf39c..1c3d5f9 100644
--- a/config/cmake/ConfigureChecks.cmake
+++ b/config/cmake/ConfigureChecks.cmake
@@ -171,6 +171,17 @@ option (HDF5_ENABLE_ROS3_VFD "Build the ROS3 Virtual File Driver" OFF)
     endif ()
 endif ()
 
+# ----------------------------------------------------------------------
+# Check whether we can build the Mirror VFD 
+# Header-check flags set in config/cmake_ext_mod/ConfigureChecks.cmake
+# ----------------------------------------------------------------------
+if ( ${HDF_PREFIX}_HAVE_NETINET_IN_H AND
+     ${HDF_PREFIX}_HAVE_NETDB_H      AND
+     ${HDF_PREFIX}_HAVE_ARPA_INET_H  AND
+     ${HDF_PREFIX}_HAVE_SYS_SOCKET_H)
+    set (${HDF_PREFIX}_HAVE_MIRROR_VFD 1)
+endif()
+
 #-----------------------------------------------------------------------------
 # Check if C has __float128 extension
 #-----------------------------------------------------------------------------
diff --git a/config/cmake/H5pubconf.h.in b/config/cmake/H5pubconf.h.in
index 0836168..6edf6b4 100644
--- a/config/cmake/H5pubconf.h.in
+++ b/config/cmake/H5pubconf.h.in
@@ -104,6 +104,9 @@
 /* Define if the compiler understands the __func__ keyword */
 #cmakedefine H5_HAVE_C99_FUNC @H5_HAVE_C99_FUNC@
 
+/* Define to 1 if you have the <arpa/inet.h> header file. */
+#cmakedefine H5_HAVE_ARPA_INET_H @H5_HAVE_ARPA_INET_H@
+
 /* Define to 1 if you have the `clock_gettime' function. */
 #cmakedefine H5_HAVE_CLOCK_GETTIME @H5_HAVE_CLOCK_GETTIME@
 
@@ -273,6 +276,9 @@
 /* Define to 1 if you have the <memory.h> header file. */
 #cmakedefine H5_HAVE_MEMORY_H @H5_HAVE_MEMORY_H@
 
+/* Define if we can build the Mirror VFD */
+#cmakedefine H5_HAVE_MIRROR_VFD @H5_HAVE_MIRROR_VFD@
+
 /* Define if we have MPE support */
 #cmakedefine H5_HAVE_MPE @H5_HAVE_MPE@
 
@@ -285,6 +291,12 @@
 /* Define if MPI_Info_c2f and MPI_Info_f2c exists */
 #cmakedefine H5_HAVE_MPI_MULTI_LANG_Info @H5_HAVE_MPI_MULTI_LANG_Info@
 
+/* Define to 1 if you have the <netdb.h> header file. */
+#cmakedefine H5_HAVE_NETDB_H @H5_HAVE_NETDB_H@
+
+/* Define to 1 if you have the <netinet/in.h> header file. */
+#cmakedefine H5_HAVE_NETINET_IN_H @H5_HAVE_NETINET_IN_H@
+
 /* Define to 1 if you have the <openssl/evp.h> header file. */
 #cmakedefine H5_HAVE_OPENSSL_EVP_H @H5_HAVE_OPENSSL_EVP_H@
 
diff --git a/config/cmake/libhdf5.settings.cmake.in b/config/cmake/libhdf5.settings.cmake.in
index 8397d68..190fce2 100644
--- a/config/cmake/libhdf5.settings.cmake.in
+++ b/config/cmake/libhdf5.settings.cmake.in
@@ -76,6 +76,7 @@ Parallel Filtered Dataset Writes: @PARALLEL_FILTERED_WRITES@
           I/O filters (external): @EXTERNAL_FILTERS@
                              MPE: @H5_HAVE_LIBLMPE@
                       Direct VFD: @H5_HAVE_DIRECT@
+                      Mirror VFD: @H5_HAVE_MIRROR_VFD@
               (Read-Only) S3 VFD: @H5_HAVE_ROS3_VFD@
             (Read-Only) HDFS VFD: @H5_HAVE_LIBHDFS@
                          dmalloc: @H5_HAVE_LIBDMALLOC@
diff --git a/config/cmake_ext_mod/ConfigureChecks.cmake b/config/cmake_ext_mod/ConfigureChecks.cmake
index 52cb7dd..7a033f4 100644
--- a/config/cmake_ext_mod/ConfigureChecks.cmake
+++ b/config/cmake_ext_mod/ConfigureChecks.cmake
@@ -165,6 +165,8 @@ CHECK_INCLUDE_FILE_CONCAT ("memory.h"        ${HDF_PREFIX}_HAVE_MEMORY_H)
 CHECK_INCLUDE_FILE_CONCAT ("dlfcn.h"         ${HDF_PREFIX}_HAVE_DLFCN_H)
 CHECK_INCLUDE_FILE_CONCAT ("inttypes.h"      ${HDF_PREFIX}_HAVE_INTTYPES_H)
 CHECK_INCLUDE_FILE_CONCAT ("netinet/in.h"    ${HDF_PREFIX}_HAVE_NETINET_IN_H)
+CHECK_INCLUDE_FILE_CONCAT ("netdb.h"         ${HDF_PREFIX}_HAVE_NETDB_H)
+CHECK_INCLUDE_FILE_CONCAT ("arpa/inet.h"     ${HDF_PREFIX}_HAVE_ARPA_INET_H)
 # _Bool type support
 CHECK_INCLUDE_FILE_CONCAT (stdbool.h    ${HDF_PREFIX}_HAVE_STDBOOL_H)
 
@@ -677,3 +679,4 @@ endif ()
 # the cache value is set in it's config file)
 #
 set (${HDF_PREFIX}_CONVERT_DENORMAL_FLOAT 1)
+