1 /* settime -- set the system clock
2 Copyright (C) 2002, 2004 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program 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
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Written by Paul Eggert. */
32 /* Some systems don't have ENOSYS. */
35 # define ENOSYS ENOTSUP
37 /* Some systems don't have ENOTSUP either. */
38 # define ENOSYS EINVAL
42 /* Set the system time. */
45 settime (struct timespec const *ts)
47 #if defined CLOCK_REALTIME && HAVE_CLOCK_SETTIME
49 int r = clock_settime (CLOCK_REALTIME, ts);
50 if (r == 0 || errno == EPERM)
60 tv.tv_sec = ts->tv_sec;
61 tv.tv_usec = ts->tv_nsec / 1000;
62 r = settimeofday (&tv, 0);
63 if (r == 0 || errno == EPERM)
69 return stime (&ts->tv_sec);