1 # Detect some bugs in glibc's implementation of utimes.
4 dnl Copyright (C) 2003-2005, 2009-2010 Free Software Foundation, Inc.
5 dnl This file is free software; the Free Software Foundation
6 dnl gives unlimited permission to copy and/or distribute it,
7 dnl with or without modifications, as long as this notice is preserved.
9 # See if we need to work around bugs in glibc's implementation of
10 # utimes from 2003-07-12 to 2003-09-17.
11 # First, there was a bug that would make utimes set mtime
12 # and atime to zero (1970-01-01) unconditionally.
13 # Then, there was code to round rather than truncate.
14 # Then, there was an implementation (sparc64, Linux-2.4.28, glibc-2.3.3)
15 # that didn't honor the NULL-means-set-to-current-time semantics.
16 # Finally, there was also a version of utimes that failed on read-only
17 # files, while utime worked fine (linux-2.2.20, glibc-2.2.5).
19 # From Jim Meyering, with suggestions from Paul Eggert.
21 AC_DEFUN([gl_FUNC_UTIMES],
23 AC_CACHE_CHECK([whether the utimes function works],
24 [gl_cv_func_working_utimes],
26 AC_RUN_IFELSE([AC_LANG_SOURCE([[
27 #include <sys/types.h>
41 char const *file = "conftest.utimes";
43 /* Test whether utimes() essentially works. */
45 static struct timeval timeval[2] = {{9, 10}, {999999, 999999}};
47 FILE *f = fopen (file, "w");
50 else if (fclose (f) != 0)
52 else if (utimes (file, timeval) != 0)
54 else if (lstat (file, &sbuf) != 0)
56 else if (!(sbuf.st_atime == timeval[0].tv_sec
57 && sbuf.st_mtime == timeval[1].tv_sec))
62 /* Test whether utimes() with a NULL argument sets the file's timestamp
63 to the current time. Note that this test fails on NFS file systems
64 if there is a time skew between the host and the NFS server. */
67 FILE *f = fopen (file, "w");
70 else if (fclose (f) != 0)
75 if (time (&now) == (time_t)-1)
77 else if (utimes (file, NULL) != 0)
79 else if (lstat (file, &sbuf) != 0)
83 if (!(now - sbuf.st_atime <= 2))
85 if (!(now - sbuf.st_mtime <= 2))
92 /* Test whether utimes() with a NULL argument works on read-only files. */
94 int fd = open (file, O_WRONLY|O_CREAT, 0444);
97 else if (close (fd) != 0)
99 else if (utimes (file, NULL) != 0)
107 [gl_cv_func_working_utimes=yes],
108 [gl_cv_func_working_utimes=no],
109 [gl_cv_func_working_utimes=no])])
111 if test $gl_cv_func_working_utimes = yes; then
112 AC_DEFINE([HAVE_WORKING_UTIMES], [1], [Define if utimes works properly. ])