1 /* settime -- set the system clock
3 Copyright (C) 2002, 2004, 2005, 2006, 2007 Free Software
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.
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.
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/>. */
19 /* Written by Paul Eggert. */
30 /* Some systems don't have ENOSYS. */
33 # define ENOSYS ENOTSUP
35 /* Some systems don't have ENOTSUP either. */
36 # define ENOSYS EINVAL
40 /* Set the system time. */
43 settime (struct timespec const *ts)
45 #if defined CLOCK_REALTIME && HAVE_CLOCK_SETTIME
47 int r = clock_settime (CLOCK_REALTIME, ts);
48 if (r == 0 || errno == EPERM)
57 tv.tv_sec = ts->tv_sec;
58 tv.tv_usec = ts->tv_nsec / 1000;
59 return settimeofday (&tv, 0);
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
65 return stime (&ts->tv_sec);