/* Set file access and modification times. Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ /* Written by Paul Eggert. */ /* derived from a function in touch.c */ #include <config.h> #include "utimens.h" #include <errno.h> #include <fcntl.h> #include <sys/time.h> #include <unistd.h> #if HAVE_UTIME_H # include <utime.h> #endif /* Some systems (even some that do have <utime.h>) don't declare this structure anywhere. */ #ifndef HAVE_STRUCT_UTIMBUF struct utimbuf { long actime; long modtime; }; #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 #ifndef __attribute__ # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__ # define __attribute__(x) # endif #endif #ifndef ATTRIBUTE_UNUSED # define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) #endif /* Set the access and modification time stamps of FD (a.k.a. FILE) to be 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 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 gl_futimens (int fd ATTRIBUTE_UNUSED, char const *file, struct timespec const timespec[2]) { /* Some Linux-based NFS clients are buggy, and mishandle time stamps of files in NFS file systems in some cases. We have no configure-time test for this, but please see <http://bugs.gentoo.org/show_bug.cgi?id=132673> for references to some of the problems with Linux 2.6.16. If this affects you, compile with -DHAVE_BUGGY_NFS_TIME_STAMPS; this is reported to help in some cases, albeit at a cost in performance. But you really should upgrade your kernel to a fixed version, since the problem affects many applications. */ #if HAVE_BUGGY_NFS_TIME_STAMPS if (fd < 0) sync (); else fsync (fd); #endif /* 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_FUTIMESAT || HAVE_WORKING_UTIMES struct timeval timeval[2]; struct timeval const *t; if (timespec) { timeval[0].tv_sec = timespec[0].tv_sec; timeval[0].tv_usec = timespec[0].tv_nsec / 1000; timeval[1].tv_sec = timespec[1].tv_sec; timeval[1].tv_usec = timespec[1].tv_nsec / 1000; t = timeval; } else t = NULL; if (fd < 0) { # if HAVE_FUTIMESAT return futimesat (AT_FDCWD, file, t); # endif } else { /* If futimesat or futimes fails here, don't try to speed things up by returning right away. glibc 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 incorrectly fails with errno == EACCES. If 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. */ # if HAVE_FUTIMESAT if (futimesat (fd, NULL, t) == 0) return 0; # elif HAVE_FUTIMES if (futimes (fd, t) == 0) return 0; # endif } #endif if (!file) { #if ! (HAVE_FUTIMESAT || (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; } #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 } /* Set the access and modification time stamps of FILE to be TIMESPEC[0] and TIMESPEC[1], respectively. */ int utimens (char const *file, struct timespec const timespec[2]) { return gl_futimens (-1, file, timespec); }