Home | History | Annotate | Download | only in shmget 
      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  *	shmget03.c
     23  *
     24  * DESCRIPTION
     25  *	shmget03 - test for ENOSPC error
     26  *
     27  * ALGORITHM
     28  *	create shared memory segments in a loop until reaching the system limit
     29  *	loop if that option was specified
     30  *	  attempt to create yet another shared memory segment
     31  *	  check the errno value
     32  *	    issue a PASS message if we get ENOSPC
     33  *	  otherwise, the tests fails
     34  *	    issue a FAIL message
     35  *	call cleanup
     36  *
     37  * USAGE:  <for command-line>
     38  *  shmget03 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
     39  *     where,  -c n : Run n copies concurrently.
     40  *             -e   : Turn on errno logging.
     41  *	       -i n : Execute test n times.
     42  *	       -I x : Execute test for x seconds.
     43  *	       -P x : Pause for x seconds between iterations.
     44  *	       -t   : Turn on syscall timing.
     45  *
     46  * HISTORY
     47  *	03/2001 - Written by Wayne Boyer
     48  *
     49  * RESTRICTIONS
     50  *	none
     51  */
     52 
     53 #include "ipcshm.h"
     54 
     55 char *TCID = "shmget03";
     56 int TST_TOTAL = 1;
     57 
     58 /*
     59  * The MAXIDS value is somewhat arbitrary and may need to be increased
     60  * depending on the system being tested.
     61  */
     62 #define MAXIDS	8192
     63 
     64 int shm_id_1 = -1;
     65 int num_shms = 0;
     66 
     67 int shm_id_arr[MAXIDS];
     68 
     69 int main(int ac, char **av)
     70 {
     71 	int lc;
     72 
     73 	tst_parse_opts(ac, av, NULL, NULL);
     74 
     75 	setup();		/* global setup */
     76 
     77 	/* The following loop checks looping state if -i option given */
     78 
     79 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     80 		/* reset tst_count in case we are looping */
     81 		tst_count = 0;
     82 
     83 		/*
     84 		 * use the TEST() macro to make the call
     85 		 */
     86 
     87 		TEST(shmget(IPC_PRIVATE, SHM_SIZE, IPC_CREAT | IPC_EXCL
     88 			    | SHM_RW));
     89 
     90 		if (TEST_RETURN != -1) {
     91 			tst_resm(TFAIL, "call succeeded when error expected");
     92 			continue;
     93 		}
     94 
     95 		switch (TEST_ERRNO) {
     96 		case ENOSPC:
     97 			tst_resm(TPASS, "expected failure - errno = "
     98 				 "%d : %s", TEST_ERRNO, strerror(TEST_ERRNO));
     99 			break;
    100 		default:
    101 			tst_resm(TFAIL, "call failed with an "
    102 				 "unexpected error - %d : %s",
    103 				 TEST_ERRNO, strerror(TEST_ERRNO));
    104 			break;
    105 		}
    106 	}
    107 
    108 	cleanup();
    109 
    110 	tst_exit();
    111 }
    112 
    113 /*
    114  * setup() - performs all the ONE TIME setup for this test.
    115  */
    116 void setup(void)
    117 {
    118 
    119 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
    120 
    121 	TEST_PAUSE;
    122 
    123 	/*
    124 	 * Create a temporary directory and cd into it.
    125 	 * This helps to ensure that a unique msgkey is created.
    126 	 * See ../lib/libipc.c for more information.
    127 	 */
    128 	tst_tmpdir();
    129 
    130 	/* get an IPC resource key */
    131 	shmkey = getipckey();
    132 
    133 	/*
    134 	 * Use a while loop to create the maximum number of memory segments.
    135 	 * If the loop exceeds MAXIDS, then break the test and cleanup.
    136 	 */
    137 	while ((shm_id_1 = shmget(IPC_PRIVATE, SHM_SIZE, IPC_CREAT |
    138 				  IPC_EXCL | SHM_RW)) != -1) {
    139 		shm_id_arr[num_shms++] = shm_id_1;
    140 		if (num_shms == MAXIDS) {
    141 			tst_brkm(TBROK, cleanup, "The maximum number of shared "
    142 				 "memory ID's has been\n\t reached.  Please "
    143 				 "increase the MAXIDS value in the test.");
    144 		}
    145 	}
    146 
    147 	/*
    148 	 * If the errno is other than ENOSPC, then something else is wrong.
    149 	 */
    150 	if (errno != ENOSPC) {
    151 		tst_resm(TINFO, "errno = %d : %s", errno, strerror(errno));
    152 		tst_brkm(TBROK, cleanup, "Didn't get ENOSPC in test setup");
    153 	}
    154 }
    155 
    156 /*
    157  * cleanup() - performs all the ONE TIME cleanup for this test at completion
    158  * 	       or premature exit.
    159  */
    160 void cleanup(void)
    161 {
    162 	int i;
    163 
    164 	/* remove the shared memory resources that were created */
    165 	for (i = 0; i < num_shms; i++) {
    166 		rm_shm(shm_id_arr[i]);
    167 	}
    168 
    169 	tst_rmdir();
    170 
    171 }
    172