*-map tests: Fix compilation error.
[gnulib.git] / lib / settime.c
blobfc9839b60caf0f086fdf14850fbd0279ae7c023f
1 /* settime -- set the system clock
3 Copyright (C) 2002, 2004-2007, 2009-2019 Free Software Foundation, Inc.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
18 /* Written by Paul Eggert. */
20 #include <config.h>
22 #include "timespec.h"
24 #include <sys/time.h>
25 #include <unistd.h>
27 #include <errno.h>
29 /* Set the system time. */
31 int
32 settime (struct timespec const *ts)
34 #if defined CLOCK_REALTIME && HAVE_CLOCK_SETTIME
36 int r = clock_settime (CLOCK_REALTIME, ts);
37 if (r == 0 || errno == EPERM)
38 return r;
40 #endif
42 #if HAVE_SETTIMEOFDAY
44 struct timeval tv;
46 tv.tv_sec = ts->tv_sec;
47 tv.tv_usec = ts->tv_nsec / 1000;
48 return settimeofday (&tv, 0);
50 #elif HAVE_STIME
51 /* This fails to compile on OSF1 V5.1, due to stime requiring
52 a 'long int*' and tv_sec is 'int'. But that system does provide
53 settimeofday. */
54 return stime (&ts->tv_sec);
55 #else
56 errno = ENOSYS;
57 return -1;
58 #endif