sysdeps/unix/sysv/linux/utimes.c

   1 /* Copyright (C) 1995-2013 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <stddef.h>
  20 #include <utime.h>
  21 #include <sys/time.h>
  22 #include <sysdep.h>
  23 #include <kernel-features.h>
  24
  25
  26 /* Change the access time of FILE to TVP[0] and
  27    the modification time of FILE to TVP[1].  */
  28 int
  29 __utimes (const char *file, const struct timeval tvp[2])
  30 {
  31 #ifdef __NR_utimes
  32   int result = INLINE_SYSCALL (utimes, 2, file, tvp);
  33 # ifndef __ASSUME_UTIMES
  34   if (result != -1 || errno != ENOSYS)
  35 # endif
  36     return result;
  37 #endif
  38
  39   /* The utimes() syscall does not exist or is not available in the
  40      used kernel.  Use utime().  For this we have to convert to the
  41      data format utime() expects.  */
  42 #ifndef __ASSUME_UTIMES
  43   struct utimbuf buf;
  44   struct utimbuf *times;
  45
  46   if (tvp != NULL)
  47     {
  48       times = &buf;
  49       buf.actime = tvp[0].tv_sec + tvp[0].tv_usec / 1000000;
  50       buf.modtime = tvp[1].tv_sec + tvp[1].tv_usec / 1000000;
  51     }
  52   else
  53     times = NULL;
  54
  55   return INLINE_SYSCALL (utime, 2, file, times);
  56 #endif
  57 }
  58
  59 weak_alias (__utimes, utimes)