1 /* Set file access and modification times.
3 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free
4 Software Foundation, Inc.
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
48 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
49 # define __attribute__(x)
53 #ifndef ATTRIBUTE_UNUSED
54 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
57 /* Set the access and modification time stamps of FD (a.k.a. FILE) to be
58 TIMESPEC[0] and TIMESPEC[1], respectively.
59 FD must be either negative -- in which case it is ignored --
60 or a file descriptor that is open on FILE.
61 If FD is nonnegative, then FILE can be NULL, which means
62 use just futimes (or equivalent) instead of utimes (or equivalent),
63 and fail if on an old system without futimes (or equivalent).
64 If TIMESPEC is null, set the time stamps to the current time.
65 Return 0 on success, -1 (setting errno) on failure. */
68 gl_futimens (int fd ATTRIBUTE_UNUSED,
69 char const *file, struct timespec const timespec[2])
71 /* Some Linux-based NFS clients are buggy, and mishandle time stamps
72 of files in NFS file systems in some cases. We have no
73 configure-time test for this, but please see
74 <http://bugs.gentoo.org/show_bug.cgi?id=132673> for references to
75 some of the problems with Linux 2.6.16. If this affects you,
76 compile with -DHAVE_BUGGY_NFS_TIME_STAMPS; this is reported to
77 help in some cases, albeit at a cost in performance. But you
78 really should upgrade your kernel to a fixed version, since the
79 problem affects many applications. */
81 #if HAVE_BUGGY_NFS_TIME_STAMPS
88 /* POSIX 200x added two interfaces to set file timestamps with
89 nanosecond resolution. We provide a fallback for ENOSYS (for
90 example, compiling against Linux 2.6.25 kernel headers and glibc
91 2.7, but running on Linux 2.6.18 kernel). */
95 int result = utimensat (AT_FDCWD, file, timespec, 0);
97 /* Work around what might be a kernel bug:
98 http://bugzilla.redhat.com/442352
99 http://bugzilla.redhat.com/449910
100 It appears that utimensat can mistakenly return 280 rather
101 than -1 upon failure.
102 FIXME: remove in 2010 or whenever the offending kernels
103 are no longer in common use. */
108 if (result == 0 || errno != ENOSYS)
114 int result = futimens (fd, timespec);
116 /* Work around the same bug as above. */
120 if (result == 0 || errno != ENOSYS)
125 /* The platform lacks an interface to set file timestamps with
126 nanosecond resolution, so do the best we can, discarding any
127 fractional part of the timestamp. */
129 #if HAVE_FUTIMESAT || HAVE_WORKING_UTIMES
130 struct timeval timeval[2];
131 struct timeval const *t;
134 timeval[0].tv_sec = timespec[0].tv_sec;
135 timeval[0].tv_usec = timespec[0].tv_nsec / 1000;
136 timeval[1].tv_sec = timespec[1].tv_sec;
137 timeval[1].tv_usec = timespec[1].tv_nsec / 1000;
146 return futimesat (AT_FDCWD, file, t);
151 /* If futimesat or futimes fails here, don't try to speed things
152 up by returning right away. glibc can incorrectly fail with
153 errno == ENOENT if /proc isn't mounted. Also, Mandrake 10.0
154 in high security mode doesn't allow ordinary users to read
155 /proc/self, so glibc incorrectly fails with errno == EACCES.
156 If errno == EIO, EPERM, or EROFS, it's probably safe to fail
157 right away, but these cases are rare enough that they're not
158 worth optimizing, and who knows what other messed-up systems
159 are out there? So play it safe and fall back on the code
162 if (futimesat (fd, NULL, t) == 0)
165 if (futimes (fd, t) == 0)
169 #endif /* HAVE_FUTIMESAT || HAVE_WORKING_UTIMES */
173 #if ! (HAVE_FUTIMESAT || (HAVE_WORKING_UTIMES && HAVE_FUTIMES))
177 /* Prefer EBADF to ENOSYS if both error numbers apply. */
181 int dup_errno = errno;
184 errno = (fd2 < 0 && dup_errno == EBADF ? EBADF : ENOSYS);
190 #if HAVE_WORKING_UTIMES
191 return utimes (file, t);
194 struct utimbuf utimbuf;
195 struct utimbuf const *ut;
198 utimbuf.actime = timespec[0].tv_sec;
199 utimbuf.modtime = timespec[1].tv_sec;
205 return utime (file, ut);
207 #endif /* !HAVE_WORKING_UTIMES */
211 /* Set the access and modification time stamps of FILE to be
212 TIMESPEC[0] and TIMESPEC[1], respectively. */
214 utimens (char const *file, struct timespec const timespec[2])
216 return gl_futimens (-1, file, timespec);