1 /* Set file access and modification times.
3 Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published by the
7 Free Software Foundation; either version 2, or (at your option) any
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
19 /* Written by Paul Eggert. */
21 /* derived from a function in touch.c */
35 /* Some systems (even some that do have <utime.h>) don't declare this
36 structure anywhere. */
37 #ifndef HAVE_STRUCT_UTIMBUF
45 /* Some systems don't have ENOSYS. */
48 # define ENOSYS ENOTSUP
50 /* Some systems don't have ENOTSUP either. */
51 # define ENOSYS EINVAL
56 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
57 # define __attribute__(x)
61 #ifndef ATTRIBUTE_UNUSED
62 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
65 /* Set the access and modification time stamps of FD (a.k.a. FILE) to be
66 TIMESPEC[0] and TIMESPEC[1], respectively.
67 FD must be either negative -- in which case it is ignored --
68 or a file descriptor that is open on FILE.
69 If FD is nonnegative, then FILE can be NULL, which means
70 use just futimes (or equivalent) instead of utimes (or equivalent),
71 and fail if on an old system without futimes (or equivalent).
72 If TIMESPEC is null, set the time stamps to the current time.
73 Return 0 on success, -1 (setting errno) on failure. */
76 futimens (int fd ATTRIBUTE_UNUSED,
77 char const *file, struct timespec const timespec[2])
79 /* Some Linux-based NFS clients are buggy, and mishandle time stamps
80 of files in NFS file systems in some cases. We have no
81 configure-time test for this, but please see
82 <http://bugs.gentoo.org/show_bug.cgi?id=132673> for references to
83 some of the problems with Linux 2.6.16. If this affects you,
84 compile with -DHAVE_BUGGY_NFS_TIME_STAMPS; this is reported to
85 help in some cases, albeit at a cost in performance. But you
86 really should upgrade your kernel to a fixed version, since the
87 problem affects many applications. */
89 #if HAVE_BUGGY_NFS_TIME_STAMPS
96 /* There's currently no interface to set file timestamps with
97 nanosecond resolution, so do the best we can, discarding any
98 fractional part of the timestamp. */
99 #if HAVE_FUTIMESAT || HAVE_WORKING_UTIMES
100 struct timeval timeval[2];
101 struct timeval const *t;
104 timeval[0].tv_sec = timespec[0].tv_sec;
105 timeval[0].tv_usec = timespec[0].tv_nsec / 1000;
106 timeval[1].tv_sec = timespec[1].tv_sec;
107 timeval[1].tv_usec = timespec[1].tv_nsec / 1000;
117 return futimesat (AT_FDCWD, file, t);
122 /* If futimesat or futimes fails here, don't try to speed things
123 up by returning right away. glibc can incorrectly fail with
124 errno == ENOENT if /proc isn't mounted. Also, Mandrake 10.0
125 in high security mode doesn't allow ordinary users to read
126 /proc/self, so glibc incorrectly fails with errno == EACCES.
127 If errno == EIO, EPERM, or EROFS, it's probably safe to fail
128 right away, but these cases are rare enough that they're not
129 worth optimizing, and who knows what other messed-up systems
130 are out there? So play it safe and fall back on the code
133 if (futimesat (fd, NULL, t) == 0)
136 if (futimes (fd, t) == 0)
144 #if ! (HAVE_FUTIMESAT || (HAVE_WORKING_UTIMES && HAVE_FUTIMES))
148 /* Prefer EBADF to ENOSYS if both error numbers apply. */
152 int dup_errno = errno;
155 errno = (fd2 < 0 && dup_errno == EBADF ? EBADF : ENOSYS);
161 #if HAVE_WORKING_UTIMES
162 return utimes (file, t);
165 struct utimbuf utimbuf;
166 struct utimbuf const *ut;
169 utimbuf.actime = timespec[0].tv_sec;
170 utimbuf.modtime = timespec[1].tv_sec;
176 return utime (file, ut);
181 /* Set the access and modification time stamps of FILE to be
182 TIMESPEC[0] and TIMESPEC[1], respectively. */
184 utimens (char const *file, struct timespec const timespec[2])
186 return futimens (-1, file, timespec);