60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
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/* settime -- set the system clock
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Copyright (C) 2002, 2004-2007, 2009-2020 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert. */
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#include <config.h>
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#include "timespec.h"
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#include <sys/time.h>
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#include <unistd.h>
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#include <errno.h>
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/* Set the system time. */
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int
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settime (struct timespec const *ts)
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{
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#if defined CLOCK_REALTIME && HAVE_CLOCK_SETTIME
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{
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int r = clock_settime (CLOCK_REALTIME, ts);
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if (r == 0 || errno == EPERM)
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return r;
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}
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#endif
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#if HAVE_SETTIMEOFDAY
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{
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struct timeval tv;
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tv.tv_sec = ts->tv_sec;
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tv.tv_usec = ts->tv_nsec / 1000;
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return settimeofday (&tv, 0);
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}
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#elif HAVE_STIME
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/* This fails to compile on OSF1 V5.1, due to stime requiring
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a 'long int*' and tv_sec is 'int'. But that system does provide
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settimeofday. */
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return stime (&ts->tv_sec);
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#else
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errno = ENOSYS;
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return -1;
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#endif
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}
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