Line data    Source code

       1             : /* settime -- set the system clock
       2             : 
       3             :    Copyright (C) 2002, 2004, 2005, 2006, 2007 Free Software
       4             :    Foundation, Inc.
       5             : 
       6             :    This program is free software: you can redistribute it and/or modify
       7             :    it under the terms of the GNU General Public License as published by
       8             :    the Free Software Foundation; either version 3 of the License, or
       9             :    (at your option) any later version.
      10             : 
      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.
      15             : 
      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/>.  */
      18             : 
      19             : /* Written by Paul Eggert.  */
      20             : 
      21             : #include <config.h>
      22             : 
      23             : #include "timespec.h"
      24             : 
      25             : #include <sys/time.h>
      26             : #include <unistd.h>
      27             : 
      28             : #include <errno.h>
      29             : 
      30             : /* Some systems don't have ENOSYS.  */
      31             : #ifndef ENOSYS
      32             : # ifdef ENOTSUP
      33             : #  define ENOSYS ENOTSUP
      34             : # else
      35             : /* Some systems don't have ENOTSUP either.  */
      36             : #  define ENOSYS EINVAL
      37             : # endif
      38             : #endif
      39             : 
      40             : /* Set the system time.  */
      41             : 
      42             : int
      43           2 : settime (struct timespec const *ts)
      44             : {
      45             : #if defined CLOCK_REALTIME && HAVE_CLOCK_SETTIME
      46             :   {
      47           2 :     int r = clock_settime (CLOCK_REALTIME, ts);
      48           2 :     if (r == 0 || errno == EPERM)
      49           2 :       return r;
      50             :   }
      51             : #endif
      52             : 
      53             : #if HAVE_SETTIMEOFDAY
      54             :   {
      55             :     struct timeval tv;
      56             : 
      57           0 :     tv.tv_sec = ts->tv_sec;
      58           0 :     tv.tv_usec = ts->tv_nsec / 1000;
      59           0 :     return settimeofday (&tv, 0);
      60             :   }
      61             : #elif HAVE_STIME
      62             :   /* This fails to compile on OSF1 V5.1, due to stime requiring
      63             :      a `long int*' and tv_sec is `int'.  But that system does provide
      64             :      settimeofday.  */
      65             :   return stime (&ts->tv_sec);
      66             : #else
      67             :   errno = ENOSYS;
      68             :   return -1;
      69             : #endif
      70             : }