1 /* 2 * Copyright (c) 1994, 1995 Christopher G. Demetriou 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Christopher G. Demetriou 16 * for the NetBSD Project. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #if defined(SYSLIBC_SCCS) && !defined(lint) 33 static char rcsid[] = "$OpenBSD: semctl.c,v 1.6 2002/02/19 19:39:37 millert Exp $"; 34 #endif /* SYSLIBC_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 #include <stdlib.h> 41 42 int semctl(int semid, int semnum, int cmd, ...) 43 { 44 va_list ap; 45 union semun semun; 46 union semun *semun_ptr = NULL; 47 48 va_start(ap, cmd); 49 if (cmd == IPC_SET || cmd == IPC_STAT || cmd == GETALL || 50 cmd == SETVAL || cmd == SETALL) { 51 semun = va_arg(ap, union semun); 52 semun_ptr = &semun; 53 } 54 va_end(ap); 55 56 return (__semctl(semid, semnum, cmd, semun_ptr)); 57 } 58