lib/utimens.c

   1 /* Copyright (C) 2003 Free Software Foundation, Inc.
   2
   3    This program is free software; you can redistribute it and/or modify it
   4    under the terms of the GNU General Public License as published by the
   5    Free Software Foundation; either version 2, or (at your option) any
   6    later version.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11    GNU General Public License for more details.
  12
  13    You should have received a copy of the GNU General Public License
  14    along with this program; if not, write to the Free Software Foundation,
  15    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  16
  17 /* Written by Paul Eggert.  */
  18
  19 /* derived from a function in touch.c */
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include "utimens.h"
  26
  27 #if HAVE_UTIME_H
  28 # include <utime.h>
  29 #endif
  30
  31 /* Some systems (even some that do have <utime.h>) don't declare this
  32    structure anywhere.  */
  33 #ifndef HAVE_STRUCT_UTIMBUF
  34 struct utimbuf
  35 {
  36   long actime;
  37   long modtime;
  38 };
  39 #endif
  40
  41 /* Set the access and modification time stamps of FILE to be
  42    TIMESPEC[0] and TIMESPEC[1], respectively.  */
  43
  44 int
  45 utimens (char const *file, struct timespec const timespec[2])
  46 {
  47   /* There's currently no interface to set file timestamps with
  48      nanosecond resolution, so do the best we can, discarding any
  49      fractional part of the timestamp.  */
  50 #if HAVE_WORKING_UTIMES
  51   struct timeval timeval[2];
  52   timeval[0].tv_sec = timespec[0].tv_sec;
  53   timeval[0].tv_usec = timespec[0].tv_nsec / 1000;
  54   timeval[1].tv_sec = timespec[1].tv_sec;
  55   timeval[1].tv_usec = timespec[1].tv_nsec / 1000;
  56   return utimes (file, timeval);
  57 #else
  58   struct utimbuf utimbuf;
  59   utimbuf.actime = timespec[0].tv_sec;
  60   utimbuf.modtime = timespec[1].tv_sec;
  61   return utime (file, &utimbuf);
  62 #endif
  63 }