+
−/* settime -- set the system clock
+
−   Copyright (C) 2002, 2004 Free Software Foundation, Inc.
+
−
+
−   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
+
−   the Free Software Foundation; either version 2, or (at your option)
+
−   any later version.
+
−
+
−   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
+
−   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, write to the Free Software Foundation,
+
−   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
−
+
−/* Written by Paul Eggert.  */
+
−
+
−#ifdef HAVE_CONFIG_H
+
−# include <config.h>
+
−#endif
+
−
+
−#include "timespec.h"
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−
+
−#if HAVE_UNISTD_H
+
−# include <unistd.h>
+
−#endif
+
−
+
−#include <errno.h>
+
−
+
−/* Some systems don't have ENOSYS.  */
+
−#ifndef ENOSYS
+
−# ifdef ENOTSUP
+
−#  define ENOSYS ENOTSUP
+
−# else
+
−/* Some systems don't have ENOTSUP either.  */
+
−#  define ENOSYS EINVAL
+
−# endif
+
−#endif
+
−
+
−/* Set the system time.  */
+
−
+
−int
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−settime (struct timespec const *ts)
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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;
+
−  }
+
−#endif
+
−
+
−#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;
+
−  }
+
−#endif
+
−
+
−#if HAVE_STIME
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−  return stime (&ts->tv_sec);
+
−#else
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−  errno = ENOSYS;
+
−  return -1;
+
−#endif
+
−}