You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/* Written by Paul Eggert. */
#include "utimens.h"
#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
#if HAVE_UTIME_H
# include <utime.h>
};
#endif
+/* Some systems don't have ENOSYS. */
+#ifndef ENOSYS
+# ifdef ENOTSUP
+# define ENOSYS ENOTSUP
+# else
+/* Some systems don't have ENOTSUP either. */
+# define ENOSYS EINVAL
+# endif
+#endif
+
#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
# define __attribute__(x)
#endif
TIMESPEC[0] and TIMESPEC[1], respectively.
FD must be either negative -- in which case it is ignored --
or a file descriptor that is open on FILE.
- If TIMESPEC is null, set the time stamps to the current time. */
+ If FD is nonnegative, then FILE can be NULL, which means
+ use just futimes (or equivalent) instead of utimes (or equivalent),
+ and fail if on an old system without futimes (or equivalent).
+ If TIMESPEC is null, set the time stamps to the current time.
+ Return 0 on success, -1 (setting errno) on failure. */
int
futimens (int fd ATTRIBUTE_UNUSED,
/* There's currently no interface to set file timestamps with
nanosecond resolution, so do the best we can, discarding any
fractional part of the timestamp. */
-#if HAVE_WORKING_UTIMES
+#if HAVE_FUTIMESAT || HAVE_WORKING_UTIMES
struct timeval timeval[2];
struct timeval const *t;
if (timespec)
}
else
t = NULL;
-# if HAVE_FUTIMES
+
+# if HAVE_FUTIMESAT
+ return fd < 0 ? futimesat (AT_FDCWD, file, t) : futimesat (fd, NULL, t);
+# elif HAVE_FUTIMES
if (0 <= fd)
{
if (futimes (fd, t) == 0)
return 0;
- /* On GNU/Linux without the futimes syscall and without /proc
- mounted, glibc futimes fails with errno == ENOENT. Fall back
- on utimes if we get a weird error number like that. */
- switch (errno)
- {
- case EACCES:
- case EIO:
- case EPERM:
- case EROFS:
- return -1;
- }
+ /* Don't worry about trying to speed things up by returning right
+ away here. glibc futimes can incorrectly fail with errno ==
+ ENOENT if /proc isn't mounted. Also, Mandrake 10.0 in high
+ security mode doesn't allow ordinary users to read /proc/self, so
+ glibc futimes incorrectly fails with errno == EACCES. If futimes
+ fails with errno == EIO, EPERM, or EROFS, it's probably safe to
+ fail right away, but these cases are rare enough that they're not
+ worth optimizing, and who knows what other messed-up systems are
+ out there? So play it safe and fall back on the code below. */
}
# endif
- return utimes (file, t);
+#endif
-#else
+#if ! HAVE_FUTIMESAT
- struct utimbuf utimbuf;
- struct utimbuf const *t;
- if (timespec)
+ if (!file)
{
- utimbuf.actime = timespec[0].tv_sec;
- utimbuf.modtime = timespec[1].tv_sec;
- t = &utimbuf;
+# if ! (HAVE_WORKING_UTIMES && HAVE_FUTIMES)
+ errno = ENOSYS;
+# endif
+
+ /* Prefer EBADF to ENOSYS if both error numbers apply. */
+ if (errno == ENOSYS)
+ {
+ int fd2 = dup (fd);
+ int dup_errno = errno;
+ if (0 <= fd2)
+ close (fd2);
+ errno = (fd2 < 0 && dup_errno == EBADF ? EBADF : ENOSYS);
+ }
+
+ return -1;
}
- else
- t = NULL;
- return utime (file, t);
+
+# if HAVE_WORKING_UTIMES
+ return utimes (file, t);
+# else
+ {
+ struct utimbuf utimbuf;
+ struct utimbuf const *ut;
+ if (timespec)
+ {
+ utimbuf.actime = timespec[0].tv_sec;
+ utimbuf.modtime = timespec[1].tv_sec;
+ ut = &utimbuf;
+ }
+ else
+ ut = NULL;
+
+ return utime (file, ut);
+ }
+# endif
#endif
}