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      1 /*
      2  * Copyright (c) 2015 Dmitry V. Levin <ldv (at) altlinux.org>
      3  * Copyright (c) 2015 Andreas Schwab <schwab (at) suse.de>
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. The name of the author may not be used to endorse or promote products
     15  *    derived from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <stdio.h>
     30 #include <errno.h>
     31 #include <sys/sem.h>
     32 
     33 union semun {
     34 	int              val;    /* Value for SETVAL */
     35 	struct semid_ds *buf;    /* Buffer for IPC_STAT, IPC_SET */
     36 	unsigned short  *array;  /* Array for GETALL, SETALL */
     37 	struct seminfo  *__buf;  /* Buffer for IPC_INFO
     38 				    (Linux-specific) */
     39 };
     40 
     41 int
     42 main(void)
     43 {
     44 	int rc, id;
     45 	union semun un;
     46 	struct semid_ds ds;
     47 	struct seminfo info;
     48 
     49 	id = semget(IPC_PRIVATE, 1, 0600);
     50 	if (id < 0)
     51 		return 77;
     52 	printf("semget\\(IPC_PRIVATE, 1, 0600\\) += %d\n", id);
     53 
     54 	un.buf = &ds;
     55 	if (semctl(id, 0, IPC_STAT, un))
     56 		goto fail;
     57 	printf("semctl\\(%d, 0, (IPC_64\\|)?IPC_STAT, \\[?%p\\]?\\) += 0\n",
     58 	       id, &ds);
     59 
     60 	un.__buf = &info;
     61 	int max = semctl(0, 0, SEM_INFO, un);
     62 	if (max < 0)
     63 		goto fail;
     64 	printf("semctl\\(0, 0, (IPC_64\\|)?SEM_INFO, \\[?%p\\]?\\) += %d\n",
     65 	       &info, max);
     66 
     67 	un.buf = &ds;
     68 	rc = semctl(id, 0, SEM_STAT, un);
     69 	if (rc != id) {
     70 		/*
     71 		 * In linux < v2.6.24-rc1 the first argument must be
     72 		 * an index in the kernel's internal array.
     73 		 */
     74 		if (-1 != rc || EINVAL != errno)
     75 			goto fail;
     76 		printf("semctl\\(%d, 0, (IPC_64\\|)?SEM_STAT, \\[?%p\\]?\\)"
     77 		       " += -1 EINVAL \\(Invalid argument\\)\n", id, &ds);
     78 	} else {
     79 		printf("semctl\\(%d, 0, (IPC_64\\|)?SEM_STAT, \\[?%p\\]?\\)"
     80 		       " += %d\n", id, &ds, id);
     81 	}
     82 
     83 	rc = 0;
     84 done:
     85 	if (semctl(id, 0, IPC_RMID, 0) < 0)
     86 		return 1;
     87 	printf("semctl\\(%d, 0, (IPC_64\\|)?IPC_RMID, \\[?0\\]?\\) += 0\n", id);
     88 	return rc;
     89 
     90 fail:
     91 	rc = 1;
     92 	goto done;
     93 }
     94