[pcca-tests.git] / mqueue.h / t_mq_ambig.c

/*
 * Copyright (c) 2009, Stathis Kamperis
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <mqueue.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define	MQNAME	"/t_mq_ambig"

int main(void)
{
	char buf[100];
	mqd_t md;

	/*
	 * In the creation of a message queue, there is an ambiguity between
	 * `oflag' and `mode_t' with respect to which one of them takes
	 * precedence over the other.
	 *
	 * It seems that `oflag' is checked first and then `mode_t'.
	 */

	/*
	 * Create a READ only message queue, but with WRITE permission bits
	 * set, and then try to actually WRITE (i.e., mq_send() data to it).
	 */
	md = mq_open(MQNAME, O_CREAT | O_EXCL | O_RDONLY, 0777, NULL);
	assert(md != (mqd_t)-1);

	assert(mq_send(md, buf, sizeof(buf), /* priority */ 0) == -1
	    && errno == EBADF);

	/* Close and remove the message queue. */
	assert(mq_close(md) != (mqd_t)-1);
	assert(mq_unlink(MQNAME) != (mqd_t)-1);

	/*
	 * Create a WRITE only message queue, but with READ permission bits
	 * set, and then try to actually READ (i.e., mq_receive() data from it).
	 */
	md = mq_open(MQNAME, O_CREAT | O_EXCL | O_WRONLY, 0777, NULL);
	assert(md != (mqd_t)-1);

	assert(mq_receive(md, buf, sizeof(buf), /* priority */ 0) == -1
	    && errno == EBADF);

	/* Close and remove the message queue. */
	assert(mq_close(md) != (mqd_t)-1);
	assert(mq_unlink(MQNAME) != (mqd_t)-1);

	printf("passed\n");

	return (EXIT_SUCCESS);
}
Commit	Line	Data
322a3d9c SK	1	/*
	2	* Copyright (c) 2009, Stathis Kamperis
	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	*
	14	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	15	* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	16	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
	17	* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
	18	* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
	19	* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
	20	* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	21	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
	22	* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	23	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
	24	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	25	* SUCH DAMAGE.
	26	*/
	27
6b79e392 SK	28	#include <assert.h>
	29	#include <errno.h>
	30	#include <fcntl.h>
	31	#include <mqueue.h>
	32	#include <stdio.h>
	33	#include <stdlib.h>
	34	#include <unistd.h>
	35
	36	#define MQNAME "/t_mq_ambig"
	37
	38	int main(void)
	39	{
	40	char buf[100];
	41	mqd_t md;
	42
	43	/*
	44	* In the creation of a message queue, there is an ambiguity between
	45	* `oflag' and `mode_t' with respect to which one of them takes
	46	* precedence over the other.
	47	*
	48	* It seems that `oflag' is checked first and then `mode_t'.
	49	*/
	50
	51	/*
	52	* Create a READ only message queue, but with WRITE permission bits
	53	* set, and then try to actually WRITE (i.e., mq_send() data to it).
	54	*/
	55	md = mq_open(MQNAME, O_CREAT \| O_EXCL \| O_RDONLY, 0777, NULL);
	56	assert(md != (mqd_t)-1);
	57
	58	assert(mq_send(md, buf, sizeof(buf), /* priority */ 0) == -1
	59	&& errno == EBADF);
	60
	61	/* Close and remove the message queue. */
	62	assert(mq_close(md) != (mqd_t)-1);
	63	assert(mq_unlink(MQNAME) != (mqd_t)-1);
	64
	65	/*
	66	* Create a WRITE only message queue, but with READ permission bits
	67	* set, and then try to actually READ (i.e., mq_receive() data from it).
	68	*/
	69	md = mq_open(MQNAME, O_CREAT \| O_EXCL \| O_WRONLY, 0777, NULL);
	70	assert(md != (mqd_t)-1);
	71
	72	assert(mq_receive(md, buf, sizeof(buf), /* priority */ 0) == -1
	73	&& errno == EBADF);
	74
	75	/* Close and remove the message queue. */
	76	assert(mq_close(md) != (mqd_t)-1);
	77	assert(mq_unlink(MQNAME) != (mqd_t)-1);
	78
	79	printf("passed\n");
	80
	81	return (EXIT_SUCCESS);
	82	}