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

   1 /* Copyright (C) 1995, 1997, 1998, 2000 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <stdarg.h>
  22 #include <sys/sem.h>
  23 #include <ipc_priv.h>
  24
  25 #include <sysdep.h>
  26 #include <sys/syscall.h>
  27
  28 /* Define a `union semun' suitable for Linux here.  */
  29 union semun
  30 {
  31   int val;                      /* value for SETVAL */
  32   struct semid_ds *buf;         /* buffer for IPC_STAT & IPC_SET */
  33   unsigned short int *array;    /* array for GETALL & SETALL */
  34   struct seminfo *__buf;        /* buffer for IPC_INFO */
  35 };
  36
  37 #include <bp-checks.h>
  38 #include <bp-semctl.h>          /* definition of CHECK_SEMCTL needs union semum */
  39
  40 /* Return identifier for array of NSEMS semaphores associated with
  41    KEY.  */
  42
  43 int
  44 semctl (int semid, int semnum, int cmd, ...)
  45 {
  46   union semun arg;
  47   va_list ap;
  48
  49   va_start (ap, cmd);
  50
  51   /* Get the argument.  */
  52   arg = va_arg (ap, union semun);
  53
  54   va_end (ap);
  55
  56   return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd,
  57                          CHECK_SEMCTL (&arg, semid, cmd)->array);
  58 }