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73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
/* settime -- set the system clock
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Copyright (C) 2002, 2004 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 2, or (at your option)
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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, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* Written by Paul Eggert. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "timespec.h"
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#include <unistd.h>
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#include <errno.h>
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/* Some systems don't have ENOSYS. */
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#ifndef ENOSYS
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# ifdef ENOTSUP
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# define ENOSYS ENOTSUP
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# else
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/* Some systems don't have ENOTSUP either. */
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# define ENOSYS EINVAL
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# endif
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#endif
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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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int r;
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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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r = settimeofday (&tv, 0);
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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_STIME
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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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