1 /* Set file access and modification times.
3 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Free Software
6 This program is free software: you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 3 of the License, or any
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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)
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 gl_futimens (int fd ATTRIBUTE_UNUSED,
79 char const *file, struct timespec const timespec[2])
81 /* Some Linux-based NFS clients are buggy, and mishandle time stamps
82 of files in NFS file systems in some cases. We have no
83 configure-time test for this, but please see
84 <http://bugs.gentoo.org/show_bug.cgi?id=132673> for references to
85 some of the problems with Linux 2.6.16. If this affects you,
86 compile with -DHAVE_BUGGY_NFS_TIME_STAMPS; this is reported to
87 help in some cases, albeit at a cost in performance. But you
88 really should upgrade your kernel to a fixed version, since the
89 problem affects many applications. */
91 #if HAVE_BUGGY_NFS_TIME_STAMPS
98 /* POSIX 200x added two interfaces to set file timestamps with
99 nanosecond resolution. We provide a fallback for ENOSYS (for
100 example, compiling against Linux 2.6.25 kernel headers and glibc
101 2.7, but running on Linux 2.6.18 kernel). */
105 int result = utimensat (AT_FDCWD, file, timespec, 0);
106 if (result == 0 || errno != ENOSYS)
112 int result = futimens (fd, timespec);
113 if (result == 0 || errno != ENOSYS)
118 /* The platform lacks an interface to set file timestamps with
119 nanosecond resolution, so do the best we can, discarding any
120 fractional part of the timestamp. */
122 #if HAVE_FUTIMESAT || HAVE_WORKING_UTIMES
123 struct timeval timeval[2];
124 struct timeval const *t;
127 timeval[0].tv_sec = timespec[0].tv_sec;
128 timeval[0].tv_usec = timespec[0].tv_nsec / 1000;
129 timeval[1].tv_sec = timespec[1].tv_sec;
130 timeval[1].tv_usec = timespec[1].tv_nsec / 1000;
139 return futimesat (AT_FDCWD, file, t);
144 /* If futimesat or futimes fails here, don't try to speed things
145 up by returning right away. glibc can incorrectly fail with
146 errno == ENOENT if /proc isn't mounted. Also, Mandrake 10.0
147 in high security mode doesn't allow ordinary users to read
148 /proc/self, so glibc incorrectly fails with errno == EACCES.
149 If errno == EIO, EPERM, or EROFS, it's probably safe to fail
150 right away, but these cases are rare enough that they're not
151 worth optimizing, and who knows what other messed-up systems
152 are out there? So play it safe and fall back on the code
155 if (futimesat (fd, NULL, t) == 0)
158 if (futimes (fd, t) == 0)
162 #endif /* HAVE_FUTIMESAT || HAVE_WORKING_UTIMES */
166 #if ! (HAVE_FUTIMESAT || (HAVE_WORKING_UTIMES && HAVE_FUTIMES))
170 /* Prefer EBADF to ENOSYS if both error numbers apply. */
174 int dup_errno = errno;
177 errno = (fd2 < 0 && dup_errno == EBADF ? EBADF : ENOSYS);
183 #if HAVE_WORKING_UTIMES
184 return utimes (file, t);
187 struct utimbuf utimbuf;
188 struct utimbuf const *ut;
191 utimbuf.actime = timespec[0].tv_sec;
192 utimbuf.modtime = timespec[1].tv_sec;
198 return utime (file, ut);
200 #endif /* !HAVE_WORKING_UTIMES */
204 /* Set the access and modification time stamps of FILE to be
205 TIMESPEC[0] and TIMESPEC[1], respectively. */
207 utimens (char const *file, struct timespec const timespec[2])
209 return gl_futimens (-1, file, timespec);