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glibc  2.9
settimeofday.c
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00001 /* Copyright (C) 1992, 1995, 1996, 1997, 2001 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <time.h>
00021 #include <sys/time.h>
00022 
00023 /* Set the current time of day and timezone information.
00024    This call is restricted to the super-user.  */
00025 int
00026 __settimeofday (tv, tz)
00027      const struct timeval *tv;
00028      const struct timezone *tz;
00029 {
00030   time_t when;
00031 
00032   if (tv == NULL)
00033     {
00034       __set_errno (EINVAL);
00035       return -1;
00036     }
00037 
00038   if (tz != NULL || tv->tv_usec % 1000000 != 0)
00039     {
00040       __set_errno (ENOSYS);
00041       return -1;
00042     }
00043 
00044   when = tv->tv_sec + (tv->tv_usec / 1000000);
00045   return stime (&when);
00046 }
00047 
00048 weak_alias (__settimeofday, settimeofday)