sysdeps/unix/sysv/linux/sparc/sparc64/semctl.c

   1 /* Copyright (C) 1995-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <stdarg.h>
  21 #include <sys/sem.h>
  22 #include <ipc_priv.h>
  23
  24 #include <sysdep.h>
  25 #include <sys/syscall.h>
  26
  27 /* Define a `union semun' suitable for Linux here.  */
  28 union semun
  29 {
  30   int val;                      /* value for SETVAL */
  31   struct semid_ds *buf;         /* buffer for IPC_STAT & IPC_SET */
  32   unsigned short int *array;    /* array for GETALL & SETALL */
  33   struct seminfo *__buf;        /* buffer for IPC_INFO */
  34 };
  35
  36 /* Return identifier for array of NSEMS semaphores associated with
  37    KEY.  */
  38
  39 int
  40 semctl (int semid, int semnum, int cmd, ...)
  41 {
  42   union semun arg;
  43   va_list ap;
  44
  45   va_start (ap, cmd);
  46
  47   /* Get the argument.  */
  48   arg = va_arg (ap, union semun);
  49
  50   va_end (ap);
  51
  52   return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd,
  53                          arg.array);
  54 }