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84 lines
2.3 KiB
Plaintext
84 lines
2.3 KiB
Plaintext
# Detect some bugs in glibc's implementation of utimes.
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dnl Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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# See if we need to work around bugs in glibc's implementation of
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# utimes from 2003-07-12 to 2003-09-17.
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# First, there was a bug that would make utimes set mtime
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# and atime to zero (1970-01-01) unconditionally.
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# Then, there was code to round rather than truncate.
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# Then, there was an implementation (sparc64, Linux-2.4.28, glibc-2.3.3)
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# that didn't honor the NULL-means-set-to-current-time semantics.
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# Finally, there was also a version of utimes that failed on read-only
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# files, while utime worked fine (linux-2.2.20, glibc-2.2.5).
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#
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# From Jim Meyering, with suggestions from Paul Eggert.
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AC_DEFUN([gl_FUNC_UTIMES],
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[
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AC_CACHE_CHECK([determine whether the utimes function works],
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gl_cv_func_working_utimes,
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[
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AC_RUN_IFELSE([AC_LANG_SOURCE([[
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/time.h>
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#include <time.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <utime.h>
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int
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main ()
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{
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static struct timeval timeval[2] = {{9, 10}, {999999, 999999}};
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struct stat sbuf;
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char const *file = "conftest.utimes";
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FILE *f;
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time_t now;
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int fd;
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int ok = ((f = fopen (file, "w"))
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&& fclose (f) == 0
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&& utimes (file, timeval) == 0
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&& lstat (file, &sbuf) == 0
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&& sbuf.st_atime == timeval[0].tv_sec
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&& sbuf.st_mtime == timeval[1].tv_sec);
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unlink (file);
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if (!ok)
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exit (1);
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ok =
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((f = fopen (file, "w"))
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&& fclose (f) == 0
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&& time (&now) != (time_t)-1
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&& utimes (file, NULL) == 0
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&& lstat (file, &sbuf) == 0
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&& now - sbuf.st_atime <= 2
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&& now - sbuf.st_mtime <= 2);
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unlink (file);
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if (!ok)
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exit (1);
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ok = (0 <= (fd = open (file, O_WRONLY|O_CREAT, 0444))
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&& close (fd) == 0
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&& utimes (file, NULL) == 0);
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unlink (file);
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exit (!ok);
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}
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]])],
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[gl_cv_func_working_utimes=yes],
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[gl_cv_func_working_utimes=no],
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[gl_cv_func_working_utimes=no])])
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if test $gl_cv_func_working_utimes = yes; then
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AC_DEFINE([HAVE_WORKING_UTIMES], 1, [Define if utimes works properly. ])
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fi
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])
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