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 */
37 /* Some systems (even some that do have <utime.h>) don't declare this
38 structure anywhere. */
39 #ifndef HAVE_STRUCT_UTIMBUF
47 /* Some systems don't have ENOSYS. */
50 # define ENOSYS ENOTSUP
52 /* Some systems don't have ENOTSUP either. */
53 # define ENOSYS EINVAL
58 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
59 # define __attribute__(x)
63 #ifndef ATTRIBUTE_UNUSED
64 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
67 /* Set the access and modification time stamps of FD (a.k.a. FILE) to be
68 TIMESPEC[0] and TIMESPEC[1], respectively.
69 FD must be either negative -- in which case it is ignored --
70 or a file descriptor that is open on FILE.
71 If FD is nonnegative, then FILE can be NULL, which means
72 use just futimes (or equivalent) instead of utimes (or equivalent),
73 and fail if on an old system without futimes (or equivalent).
74 If TIMESPEC is null, set the time stamps to the current time.
75 Return 0 on success, -1 (setting errno) on failure. */
78 futimens (int fd ATTRIBUTE_UNUSED,
79 char const *file, struct timespec const timespec[2])
81 /* There's currently no interface to set file timestamps with
82 nanosecond resolution, so do the best we can, discarding any
83 fractional part of the timestamp. */
84 #if HAVE_FUTIMESAT || HAVE_WORKING_UTIMES
85 struct timeval timeval[2];
86 struct timeval const *t;
89 timeval[0].tv_sec = timespec[0].tv_sec;
90 timeval[0].tv_usec = timespec[0].tv_nsec / 1000;
91 timeval[1].tv_sec = timespec[1].tv_sec;
92 timeval[1].tv_usec = timespec[1].tv_nsec / 1000;
102 return futimesat (AT_FDCWD, file, t);
107 /* If futimesat or futimes fails here, don't try to speed things
108 up by returning right away. glibc can incorrectly fail with
109 errno == ENOENT if /proc isn't mounted. Also, Mandrake 10.0
110 in high security mode doesn't allow ordinary users to read
111 /proc/self, so glibc incorrectly fails with errno == EACCES.
112 If errno == EIO, EPERM, or EROFS, it's probably safe to fail
113 right away, but these cases are rare enough that they're not
114 worth optimizing, and who knows what other messed-up systems
115 are out there? So play it safe and fall back on the code
118 if (futimesat (fd, NULL, t) == 0)
121 if (futimes (fd, t) == 0)
129 #if ! (HAVE_FUTIMESAT || (HAVE_WORKING_UTIMES && HAVE_FUTIMES))
133 /* Prefer EBADF to ENOSYS if both error numbers apply. */
137 int dup_errno = errno;
140 errno = (fd2 < 0 && dup_errno == EBADF ? EBADF : ENOSYS);
146 #if HAVE_WORKING_UTIMES
147 return utimes (file, t);
150 struct utimbuf utimbuf;
151 struct utimbuf const *ut;
154 utimbuf.actime = timespec[0].tv_sec;
155 utimbuf.modtime = timespec[1].tv_sec;
161 return utime (file, ut);
166 /* Set the access and modification time stamps of FILE to be
167 TIMESPEC[0] and TIMESPEC[1], respectively. */
169 utimens (char const *file, struct timespec const timespec[2])
171 return futimens (-1, file, timespec);