sysdeps/mach/adjtime.c

   1 /* Copyright (C) 1991-2018 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <sys/time.h>
  20 #include <hurd.h>
  21
  22 /* Adjust the current time of day by the amount in DELTA.
  23    If OLDDELTA is not NULL, it is filled in with the amount
  24    of time adjustment remaining to be done from the last `__adjtime' call.
  25    This call is restricted to the super-user.  */
  26 int
  27 __adjtime (const struct timeval *delta, struct timeval *olddelta)
  28 {
  29   error_t err;
  30   mach_port_t hostpriv;
  31
  32   hostpriv = __pid2task (-1);
  33   if (hostpriv == MACH_PORT_NULL)
  34     return -1;
  35   err = __host_adjust_time (hostpriv, delta, olddelta);
  36   __mach_port_deallocate (__mach_task_self (), hostpriv);
  37   if (err)
  38     return __hurd_fail (err);
  39   return 0;
  40 }
  41
  42 weak_alias (__adjtime, adjtime)