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      1 /*
      2  *
      3  *   Copyright (c) International Business Machines  Corp., 2001
      4  *
      5  *   This program is free software;  you can redistribute it and/or modify
      6  *   it under the terms of the GNU General Public License as published by
      7  *   the Free Software Foundation; either version 2 of the License, or
      8  *   (at your option) any later version.
      9  *
     10  *   This program 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
     13  *   the GNU General Public License for more details.
     14  *
     15  *   You should have received a copy of the GNU General Public License
     16  *   along with this program;  if not, write to the Free Software
     17  *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
     18  */
     19 
     20 /*
     21  * NAME
     22  *	msgrcv04.c
     23  *
     24  * DESCRIPTION
     25  *	msgrcv04 - test for E2BIG and ENOMSG errors
     26  *
     27  * ALGORITHM
     28  *	create a message queue with read/write permissions
     29  *	initialize a message buffer with a known message and type
     30  *	enqueue the message
     31  *	loop if that option was specified
     32  *	call msgrcv() using two different invalid cases
     33  *	check the errno value
     34  *	  issue a PASS message if we get E2BIG or ENOMSG
     35  *	otherwise, the tests fails
     36  *	  issue a FAIL message
     37  *	call cleanup
     38  *
     39  * USAGE:  <for command-line>
     40  *  msgrcv04 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
     41  *     where,  -c n : Run n copies concurrently.
     42  *             -e   : Turn on errno logging.
     43  *	       -i n : Execute test n times.
     44  *	       -I x : Execute test for x seconds.
     45  *	       -P x : Pause for x seconds between iterations.
     46  *	       -t   : Turn on syscall timing.
     47  *
     48  * HISTORY
     49  *	03/2001 - Written by Wayne Boyer
     50  *
     51  * RESTRICTIONS
     52  *	none
     53  */
     54 
     55 #include "test.h"
     56 
     57 #include "ipcmsg.h"
     58 
     59 void cleanup(void);
     60 void setup(void);
     61 
     62 char *TCID = "msgrcv04";
     63 int TST_TOTAL = 2;
     64 
     65 int msg_q_1 = -1;		/* The message queue id created in setup */
     66 
     67 #define SMSIZE	512
     68 
     69 MSGBUF snd_buf, rcv_buf;
     70 
     71 struct test_case_t {
     72 	int size;
     73 	int type;
     74 	int flags;
     75 	int error;
     76 } TC[] = {
     77 	/*
     78 	 * E2BIG - The receive buffer is too small for the message and
     79 	 *         MSG_NOERROR isn't asserted in the flags.
     80 	 */
     81 	{
     82 	SMSIZE, 1, 0, E2BIG},
     83 	    /*
     84 	     * ENOMSG - There is no message with the requested type and
     85 	     *          IPC_NOWAIT is asserted in the flags.
     86 	     */
     87 	{
     88 	MSGSIZE, 2, IPC_NOWAIT, ENOMSG}
     89 };
     90 
     91 int main(int ac, char **av)
     92 {
     93 	int lc;
     94 	int i;
     95 
     96 	tst_parse_opts(ac, av, NULL, NULL);
     97 
     98 	setup();		/* global setup */
     99 
    100 	/* The following loop checks looping state if -i option given */
    101 
    102 	for (lc = 0; TEST_LOOPING(lc); lc++) {
    103 		/* reset tst_count in case we are looping */
    104 		tst_count = 0;
    105 
    106 		for (i = 0; i < TST_TOTAL; i++) {
    107 
    108 			/*
    109 			 * Use the TEST macro to make the call
    110 			 */
    111 
    112 			TEST(msgrcv(msg_q_1, &rcv_buf, TC[i].size, TC[i].type,
    113 				    TC[i].flags));
    114 
    115 			if (TEST_RETURN != -1) {
    116 				tst_resm(TFAIL, "call succeeded unexpectedly");
    117 				continue;
    118 			}
    119 
    120 			if (TEST_ERRNO == TC[i].error) {
    121 				tst_resm(TPASS, "expected failure - errno = "
    122 					 "%d : %s", TEST_ERRNO,
    123 					 strerror(TEST_ERRNO));
    124 			} else {
    125 				tst_resm(TFAIL, "call failed with an "
    126 					 "unexpected error - %d : %s",
    127 					 TEST_ERRNO, strerror(TEST_ERRNO));
    128 			}
    129 		}
    130 	}
    131 
    132 	cleanup();
    133 
    134 	tst_exit();
    135 }
    136 
    137 /*
    138  * setup() - performs all the ONE TIME setup for this test.
    139  */
    140 void setup(void)
    141 {
    142 
    143 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
    144 
    145 	TEST_PAUSE;
    146 
    147 	/*
    148 	 * Create a temporary directory and cd into it.
    149 	 * This helps to ensure that a unique msgkey is created.
    150 	 * See ../lib/libipc.c for more information.
    151 	 */
    152 	tst_tmpdir();
    153 
    154 	msgkey = getipckey();
    155 
    156 	/* create a message queue with read/write permission */
    157 	if ((msg_q_1 = msgget(msgkey, IPC_CREAT | IPC_EXCL | MSG_RW)) == -1) {
    158 		tst_brkm(TBROK, cleanup, "Can't create message queue");
    159 	}
    160 
    161 	/* initialize a buffer */
    162 	init_buf(&snd_buf, MSGTYPE, MSGSIZE);
    163 
    164 	/* put the message on the queue */
    165 	if (msgsnd(msg_q_1, &snd_buf, MSGSIZE, 0) == -1) {
    166 		tst_brkm(TBROK, cleanup, "Can't enqueue message");
    167 	}
    168 }
    169 
    170 /*
    171  * cleanup() - performs all the ONE TIME cleanup for this test at completion
    172  * 	       or premature exit.
    173  */
    174 void cleanup(void)
    175 {
    176 	/* if it exists, remove the message queue that was created */
    177 	rm_queue(msg_q_1);
    178 
    179 	tst_rmdir();
    180 
    181 }
    182