sysdeps/mach/hurd/adjtime.c

   1 /* Copyright (C) 1991,93,95,97,2001 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <sys/time.h>
  21 #include <hurd.h>
  22
  23 /* Adjust the current time of day by the amount in DELTA.
  24    If OLDDELTA is not NULL, it is filled in with the amount
  25    of time adjustment remaining to be done from the last `__adjtime' call.
  26    This call is restricted to the super-user.  */
  27 int
  28 __adjtime (delta, olddelta)
  29      const struct timeval *delta;
  30      struct timeval *olddelta;
  31 {
  32   error_t err;
  33   mach_port_t hostpriv;
  34
  35   err = __get_privileged_ports (&hostpriv, NULL);
  36   if (err)
  37     return __hurd_fail (EPERM);
  38
  39   err = __host_adjust_time (hostpriv,
  40                             /* `time_value_t' and `struct timeval' are in
  41                                fact identical with the names changed.  */
  42                             *(time_value_t *) delta,
  43                             (time_value_t *) olddelta);
  44   __mach_port_deallocate (__mach_task_self (), hostpriv);
  45
  46   if (err)
  47     return __hurd_fail (err);
  48   return 0;
  49 }
  50
  51 weak_alias (__adjtime, adjtime)