1# Detect some bugs in glibc's implementation of utimes.
2
3dnl Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
4dnl This file is free software; the Free Software Foundation
5dnl gives unlimited permission to copy and/or distribute it,
6dnl with or without modifications, as long as this notice is preserved.
7
8# See if we need to work around bugs in glibc's implementation of
9# utimes from 2003-07-12 to 2003-09-17.
10# First, there was a bug that would make utimes set mtime
11# and atime to zero (1970-01-01) unconditionally.
12# Then, there was code to round rather than truncate.
13# Then, there was an implementation (sparc64, Linux-2.4.28, glibc-2.3.3)
14# that didn't honor the NULL-means-set-to-current-time semantics.
15# Finally, there was also a version of utimes that failed on read-only
16# files, while utime worked fine (linux-2.2.20, glibc-2.2.5).
17#
18# From Jim Meyering, with suggestions from Paul Eggert.
19
20AC_DEFUN([gl_FUNC_UTIMES],
21[
22  AC_CACHE_CHECK([determine whether the utimes function works],
23		 gl_cv_func_working_utimes,
24  [
25  AC_RUN_IFELSE([AC_LANG_SOURCE([[
26#include <sys/types.h>
27#include <sys/stat.h>
28#include <fcntl.h>
29#include <sys/time.h>
30#include <time.h>
31#include <unistd.h>
32#include <stdlib.h>
33#include <stdio.h>
34#include <utime.h>
35
36int
37main ()
38{
39  static struct timeval timeval[2] = {{9, 10}, {999999, 999999}};
40  struct stat sbuf;
41  char const *file = "conftest.utimes";
42  FILE *f;
43  time_t now;
44  int fd;
45
46  int ok = ((f = fopen (file, "w"))
47	    && fclose (f) == 0
48	    && utimes (file, timeval) == 0
49	    && lstat (file, &sbuf) == 0
50	    && sbuf.st_atime == timeval[0].tv_sec
51	    && sbuf.st_mtime == timeval[1].tv_sec);
52  unlink (file);
53  if (!ok)
54    exit (1);
55
56  ok =
57    ((f = fopen (file, "w"))
58     && fclose (f) == 0
59     && time (&now) != (time_t)-1
60     && utimes (file, NULL) == 0
61     && lstat (file, &sbuf) == 0
62     && now - sbuf.st_atime <= 2
63     && now - sbuf.st_mtime <= 2);
64  unlink (file);
65  if (!ok)
66    exit (1);
67
68  ok = (0 <= (fd = open (file, O_WRONLY|O_CREAT, 0444))
69	      && close (fd) == 0
70	      && utimes (file, NULL) == 0);
71  unlink (file);
72
73  exit (!ok);
74}
75  ]])],
76       [gl_cv_func_working_utimes=yes],
77       [gl_cv_func_working_utimes=no],
78       [gl_cv_func_working_utimes=no])])
79
80  if test $gl_cv_func_working_utimes = yes; then
81    AC_DEFINE([HAVE_WORKING_UTIMES], 1, [Define if utimes works properly. ])
82  fi
83])
84