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glibc  2.9
adjtime.c
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00001 /* Copyright (C) 1991, 1995, 1997 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 <sys/time.h>
00021 #include <hurd.h>
00022 
00023 /* Adjust the current time of day by the amount in DELTA.
00024    If OLDDELTA is not NULL, it is filled in with the amount
00025    of time adjustment remaining to be done from the last `__adjtime' call.
00026    This call is restricted to the super-user.  */
00027 int
00028 __adjtime (delta, olddelta)
00029      const struct timeval *delta;
00030      struct timeval *olddelta;
00031 {
00032   error_t err;
00033   mach_port_t hostpriv;
00034 
00035   hostpriv = __pid2task (-1);
00036   if (hostpriv == MACH_PORT_NULL)
00037     return -1;
00038   err = __host_adjust_time (hostpriv, delta, olddelta);
00039   __mach_port_deallocate (__mach_task_self (), hostpriv);
00040   if (err)
00041     return __hurd_fail (err);
00042   return 0;
00043 }
00044 
00045 weak_alias (__adjtime, adjtime)