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/* settime -- set the system clock
Copyright (C) 2002, 2004-2007, 2009-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Paul Eggert. */
#include <config.h>
#include "timespec.h"
#include <sys/time.h>
#include <unistd.h>
#include <errno.h>
/* Set the system time. */
int
settime (struct timespec const *ts)
{
#if defined CLOCK_REALTIME && HAVE_CLOCK_SETTIME
{
int r = clock_settime (CLOCK_REALTIME, ts);
if (r == 0 || errno == EPERM)
return r;
}
#endif
#if HAVE_SETTIMEOFDAY
{
struct timeval tv = { .tv_sec = ts->tv_sec,
.tv_usec = ts->tv_nsec / 1000 };
return settimeofday (&tv, 0);
}
#elif HAVE_STIME
/* This fails to compile on OSF1 V5.1, due to stime requiring
a 'long int*' and tv_sec is 'int'. But that system does provide
settimeofday. */
return stime (&ts->tv_sec);
#else
errno = ENOSYS;
return -1;
#endif
}
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