sysdeps/unix/sysv/linux/futimes.c

   1 /* futimes -- change access and modification times of open file.  Linux version.
   2    Copyright (C) 2002-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <sysdep.h>
  21 #include <string.h>
  22 #include <time.h>
  23 #include <utime.h>
  24 #include <sys/time.h>
  25 #include <_itoa.h>
  26 #include <fcntl.h>
  27
  28
  29 /* Change the access time of the file associated with FD to TVP[0] and
  30    the modification time of FILE to TVP[1].
  31
  32    Starting with 2.6.22 the Linux kernel has the utimensat syscall which
  33    can be used to implement futimes.  */
  34 int
  35 __futimes (int fd, const struct timeval tvp[2])
  36 {
  37   /* The utimensat system call expects timespec not timeval.  */
  38   struct timespec ts[2];
  39   if (tvp != NULL)
  40     {
  41       if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000
  42           || tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
  43         {
  44           __set_errno (EINVAL);
  45           return -1;
  46         }
  47
  48       TIMEVAL_TO_TIMESPEC (&tvp[0], &ts[0]);
  49       TIMEVAL_TO_TIMESPEC (&tvp[1], &ts[1]);
  50     }
  51
  52   return INLINE_SYSCALL (utimensat, 4, fd, NULL, tvp ? &ts : NULL, 0);
  53 }
  54 weak_alias (__futimes, futimes)