(gl_FUNC_UTIMES): New file.

1 files changed, 46 insertions, 0 deletions

diff --git a/m4/utimes.m4 b/m4/utimes.m4
new file mode 100644
index 000000000..ce1a7caf0
--- /dev/null
+++ b/m4/utimes.m4
@@ -0,0 +1,46 @@
+# See if we need to work around bugs in glibc's implementation of utimes
+# from around July/August 2003.
+# First, there was a bug that would make utimes set mtime and atime
+# to zero (1970-01-01) unconditionally.
+# Then, there is/was code to round rather than truncate.
+#
+# From Jim Meyering, with suggestions from Paul Eggert.
+
+AC_DEFUN([gl_FUNC_UTIMES],
+[
+  AC_CACHE_CHECK([determine whether the utimes function works],
+		 gl_cv_func_working_utimes,
+  [
+  AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <utime.h>
+
+int
+main ()
+{
+  static struct timeval timeval[2] = {{9, 10}, {999999, 999999}};
+  struct stat sbuf;
+  char const *file = "x";
+  FILE *f;
+
+  exit ( ! ((f = fopen (file, "w"))
+	    && fclose (f) == 0
+	    && utimes (file, timeval) == 0
+	    && lstat (file, &sbuf) == 0
+	    && sbuf.st_atime == timeval[0].tv_sec
+	    && sbuf.st_mtime == timeval[1].tv_sec) );
+}
+  ]])],
+       [gl_cv_func_working_utimes=yes],
+       [gl_cv_func_working_utimes=no],
+       [gl_cv_func_working_utimes=no])])
+
+  if test $gl_cv_func_working_utimes = yes; then
+    AC_DEFINE([HAVE_WORKING_UTIMES], 1, [Define if utimes works properly. ])
+  fi
+])