lib/libc/sys/semctl.c

   1 /*      $NetBSD: semctl.c,v 1.15 2009/01/16 00:02:57 christos Exp $     */
   2
   3 /*-
   4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Christos Zoulas.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 #include <sys/cdefs.h>
  32 #if defined(LIBC_SCCS) && !defined(lint)
  33 __RCSID("$NetBSD: semctl.c,v 1.15 2009/01/16 00:02:57 christos Exp $");
  34 #endif /* LIBC_SCCS and not lint */
  35
  36 #include <sys/types.h>
  37 #include <sys/ipc.h>
  38 #include <sys/sem.h>
  39 #include <stdarg.h>
  40
  41 /* The kernel version [... == union semun *] */
  42 int ____semctl50(int, int, int, ...);
  43
  44 int
  45 semctl(int semid, int semnum, int cmd, ...)
  46 {
  47         va_list ap;
  48         union __semun semun;
  49
  50         va_start(ap, cmd);
  51         switch (cmd) {
  52         case IPC_SET:
  53         case IPC_STAT:
  54         case GETALL:
  55         case SETVAL:
  56         case SETALL:
  57 #ifdef __lint__
  58                 memcpy(&semun, &ap, sizeof(semun));
  59 #else
  60                 semun = va_arg(ap, union __semun);
  61 #endif
  62         }
  63         va_end(ap);
  64         return ____semctl50(semid, semnum, cmd, &semun);
  65 }