1 # Detect some bugs in glibc's implementation of utimes.
3 dnl Copyright (C) 2003, 2004, 2005, 2009 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
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).
18 # From Jim Meyering, with suggestions from Paul Eggert.
20 AC_DEFUN([gl_FUNC_UTIMES],
22 AC_CACHE_CHECK([determine whether the utimes function works],
23 gl_cv_func_working_utimes,
25 AC_RUN_IFELSE([AC_LANG_SOURCE([[
26 #include <sys/types.h>
39 static struct timeval timeval[2] = {{9, 10}, {999999, 999999}};
41 char const *file = "conftest.utimes";
46 int ok = ((f = fopen (file, "w"))
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);
57 ((f = fopen (file, "w"))
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);
68 ok = (0 <= (fd = open (file, O_WRONLY|O_CREAT, 0444))
70 && utimes (file, NULL) == 0);
76 [gl_cv_func_working_utimes=yes],
77 [gl_cv_func_working_utimes=no],
78 [gl_cv_func_working_utimes=no])])
80 if test $gl_cv_func_working_utimes = yes; then
81 AC_DEFINE([HAVE_WORKING_UTIMES], [1], [Define if utimes works properly. ])