# Detect some bugs in glibc's implementation of utimes.
+# serial 3
-dnl Copyright (C) 2003, 2004, 2005, 2009 Free Software Foundation, Inc.
+dnl Copyright (C) 2003-2005, 2009-2013 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_UTIMES],
[
- AC_CACHE_CHECK([determine whether the utimes function works],
- gl_cv_func_working_utimes,
+ AC_CACHE_CHECK([whether the utimes function works],
+ [gl_cv_func_working_utimes],
[
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <sys/types.h>
#include <stdio.h>
#include <utime.h>
+static int
+inorder (time_t a, time_t b, time_t c)
+{
+ return a <= b && b <= c;
+}
+
int
main ()
{
- static struct timeval timeval[2] = {{9, 10}, {999999, 999999}};
- struct stat sbuf;
+ int result = 0;
char const *file = "conftest.utimes";
- FILE *f;
- time_t now;
- int fd;
+ static struct timeval timeval[2] = {{9, 10}, {999999, 999999}};
- int ok = ((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);
- unlink (file);
- if (!ok)
- exit (1);
+ /* Test whether utimes() essentially works. */
+ {
+ struct stat sbuf;
+ FILE *f = fopen (file, "w");
+ if (f == NULL)
+ result |= 1;
+ else if (fclose (f) != 0)
+ result |= 1;
+ else if (utimes (file, timeval) != 0)
+ result |= 2;
+ else if (lstat (file, &sbuf) != 0)
+ result |= 1;
+ else if (!(sbuf.st_atime == timeval[0].tv_sec
+ && sbuf.st_mtime == timeval[1].tv_sec))
+ result |= 4;
+ if (unlink (file) != 0)
+ result |= 1;
+ }
- ok =
- ((f = fopen (file, "w"))
- && fclose (f) == 0
- && time (&now) != (time_t)-1
- && utimes (file, NULL) == 0
- && lstat (file, &sbuf) == 0
- && now - sbuf.st_atime <= 2
- && now - sbuf.st_mtime <= 2);
- unlink (file);
- if (!ok)
- exit (1);
+ /* Test whether utimes() with a NULL argument sets the file's timestamp
+ to the current time. Use 'fstat' as well as 'time' to
+ determine the "current" time, to accommodate NFS file systems
+ if there is a time skew between the host and the NFS server. */
+ {
+ int fd = open (file, O_WRONLY|O_CREAT, 0644);
+ if (fd < 0)
+ result |= 1;
+ else
+ {
+ time_t t0, t2;
+ struct stat st0, st1, st2;
+ if (time (&t0) == (time_t) -1)
+ result |= 1;
+ else if (fstat (fd, &st0) != 0)
+ result |= 1;
+ else if (utimes (file, timeval) != 0)
+ result |= 2;
+ else if (utimes (file, NULL) != 0)
+ result |= 8;
+ else if (fstat (fd, &st1) != 0)
+ result |= 1;
+ else if (write (fd, "\n", 1) != 1)
+ result |= 1;
+ else if (fstat (fd, &st2) != 0)
+ result |= 1;
+ else if (time (&t2) == (time_t) -1)
+ result |= 1;
+ else
+ {
+ int m_ok_POSIX = inorder (t0, st1.st_mtime, t2);
+ int m_ok_NFS = inorder (st0.st_mtime, st1.st_mtime, st2.st_mtime);
+ if (! (st1.st_atime == st1.st_mtime))
+ result |= 16;
+ if (! (m_ok_POSIX || m_ok_NFS))
+ result |= 32;
+ }
+ if (close (fd) != 0)
+ result |= 1;
+ }
+ if (unlink (file) != 0)
+ result |= 1;
+ }
- ok = (0 <= (fd = open (file, O_WRONLY|O_CREAT, 0444))
- && close (fd) == 0
- && utimes (file, NULL) == 0);
- unlink (file);
+ /* Test whether utimes() with a NULL argument works on read-only files. */
+ {
+ int fd = open (file, O_WRONLY|O_CREAT, 0444);
+ if (fd < 0)
+ result |= 1;
+ else if (close (fd) != 0)
+ result |= 1;
+ else if (utimes (file, NULL) != 0)
+ result |= 64;
+ if (unlink (file) != 0)
+ result |= 1;
+ }
- exit (!ok);
+ return result;
}
]])],
[gl_cv_func_working_utimes=yes],