From d66f6f36baca6d314f1f17e11d90d52b5c9d7ec2 Mon Sep 17 00:00:00 2001
From: KWSys Robot <kwrobot@kitware.com>
Date: Fri, 31 May 2013 16:34:02 -0400
Subject: KWSys 2013-05-31 (dccf7725)

Extract upstream KWSys using the following shell commands.

$ git archive --prefix=upstream-kwsys/ dccf7725 | tar x
$ git shortlog --no-merges --abbrev=8 --format='%h %s' 725e541e..dccf7725
Brad King (2):
      e3370418 SystemTools: Use COMPILE_DEFINITIONS to pass platform tests
      dccf7725 SystemTools: Touch with better than 1s resolution if possible

Change-Id: Icdbcdf405e27b2d5dd30857c7c8679ed5096f252
---
 CMakeLists.txt            | 13 +++++++++--
 SystemTools.cxx           | 56 ++++++++++++++++++++++++++++++++++++++---------
 kwsysPlatformTestsCXX.cxx | 19 ++++++++++++++++
 3 files changed, 76 insertions(+), 12 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 124b8ac..6f0281d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -569,8 +569,17 @@ IF(KWSYS_USE_SystemTools)
     "Checking whether CXX compiler has unsetenv" DIRECT)
   KWSYS_PLATFORM_CXX_TEST(KWSYS_CXX_HAS_ENVIRON_IN_STDLIB_H
     "Checking whether CXX compiler has environ in stdlib.h" DIRECT)
-  SET_SOURCE_FILES_PROPERTIES(SystemTools.cxx PROPERTIES
-    COMPILE_FLAGS "-DKWSYS_CXX_HAS_SETENV=${KWSYS_CXX_HAS_SETENV} -DKWSYS_CXX_HAS_UNSETENV=${KWSYS_CXX_HAS_UNSETENV} -DKWSYS_CXX_HAS_ENVIRON_IN_STDLIB_H=${KWSYS_CXX_HAS_ENVIRON_IN_STDLIB_H}")
+  KWSYS_PLATFORM_CXX_TEST(KWSYS_CXX_HAS_UTIMES
+    "Checking whether CXX compiler has utimes" DIRECT)
+  KWSYS_PLATFORM_CXX_TEST(KWSYS_CXX_HAS_UTIMENSAT
+    "Checking whether CXX compiler has utimensat" DIRECT)
+  SET_PROPERTY(SOURCE SystemTools.cxx APPEND PROPERTY COMPILE_DEFINITIONS
+    KWSYS_CXX_HAS_SETENV=${KWSYS_CXX_HAS_SETENV}
+    KWSYS_CXX_HAS_UNSETENV=${KWSYS_CXX_HAS_UNSETENV}
+    KWSYS_CXX_HAS_ENVIRON_IN_STDLIB_H=${KWSYS_CXX_HAS_ENVIRON_IN_STDLIB_H}
+    KWSYS_CXX_HAS_UTIMES=${KWSYS_CXX_HAS_UTIMES}
+    KWSYS_CXX_HAS_UTIMENSAT=${KWSYS_CXX_HAS_UTIMENSAT}
+    )
 ENDIF()
 
 IF(KWSYS_USE_SystemInformation)
diff --git a/SystemTools.cxx b/SystemTools.cxx
index 158217e..652649f 100644
--- a/SystemTools.cxx
+++ b/SystemTools.cxx
@@ -1124,22 +1124,58 @@ bool SystemTools::Touch(const char* filename, bool create)
       }
     return false;
     }
-#ifdef _MSC_VER
-#define utime _utime
-#define utimbuf _utimbuf
-#endif
-  struct stat fromStat;
-  if(stat(filename, &fromStat) < 0)
+#if defined(_WIN32) && !defined(__CYGWIN__)
+  HANDLE h = CreateFile(filename, FILE_WRITE_ATTRIBUTES,
+                        FILE_SHARE_WRITE, 0, OPEN_EXISTING,
+                        FILE_FLAG_BACKUP_SEMANTICS, 0);
+  if(!h)
+    {
+    return false;
+    }
+  FILETIME mtime;
+  GetSystemTimeAsFileTime(&mtime);
+  if(!SetFileTime(h, 0, 0, &mtime))
     {
+    CloseHandle(h);
     return false;
     }
-  struct utimbuf buf;
-  buf.actime = fromStat.st_atime;
-  buf.modtime = static_cast<time_t>(SystemTools::GetTime());
-  if(utime(filename, &buf) < 0)
+  CloseHandle(h);
+#elif KWSYS_CXX_HAS_UTIMENSAT
+  struct timespec times[2] = {{0,UTIME_OMIT},{0,UTIME_NOW}};
+  if(utimensat(AT_FDCWD, filename, times, 0) < 0)
+    {
+    return false;
+    }
+#else
+  struct stat st;
+  if(stat(filename, &st) < 0)
     {
     return false;
     }
+  struct timeval mtime;
+  gettimeofday(&mtime, 0);
+# if KWSYS_CXX_HAS_UTIMES
+  struct timeval times[2] =
+    {
+#  if KWSYS_STAT_HAS_ST_MTIM
+      {st.st_atim.tv_sec, st.st_atim.tv_nsec/1000}, /* tv_sec, tv_usec */
+#  else
+      {st.st_atime, 0},
+#  endif
+      mtime
+    };
+  if(utimes(filename, times) < 0)
+    {
+    return false;
+    }
+# else
+  struct utimbuf times = {st.st_atime, mtime.tv_sec};
+  if(utime(filename, &times) < 0)
+    {
+    return false;
+    }
+# endif
+#endif
   return true;
 }
 
diff --git a/kwsysPlatformTestsCXX.cxx b/kwsysPlatformTestsCXX.cxx
index 48976c4..a7e3b50 100644
--- a/kwsysPlatformTestsCXX.cxx
+++ b/kwsysPlatformTestsCXX.cxx
@@ -494,6 +494,25 @@ int main()
 }
 #endif
 
+#ifdef TEST_KWSYS_CXX_HAS_UTIMES
+#include <sys/time.h>
+int main()
+{
+  struct timeval* current_time = 0;
+  return utimes("/example", current_time);
+}
+#endif
+
+#ifdef TEST_KWSYS_CXX_HAS_UTIMENSAT
+#include <fcntl.h>
+#include <sys/stat.h>
+int main()
+{
+  struct timespec times[2] = {{0,UTIME_OMIT},{0,UTIME_NOW}};
+  return utimensat(AT_FDCWD, "/example", times, AT_SYMLINK_NOFOLLOW);
+}
+#endif
+
 #ifdef TEST_KWSYS_CXX_TYPE_INFO
 /* Collect fundamental type information and save it to a CMake script.  */
 
-- 
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