test/ipc/shmget/shmget02.c

   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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 /*
  21  * NAME
  22  *      shmget02.c
  23  *
  24  * DESCRIPTION
  25  *      shmget02 - check for ENOENT, EEXIST and EINVAL errors
  26  *
  27  * ALGORITHM
  28  *      create a shared memory segment with read & write permissions
  29  *      loop if that option was specified
  30  *        call shmget() using five different invalid cases
  31  *        check the errno value
  32  *          issue a PASS message if we get ENOENT, EEXIST or EINVAL
  33  *        otherwise, the tests fails
  34  *          issue a FAIL message
  35  *      call cleanup
  36  *
  37  * USAGE:  <for command-line>
  38  *  shmget02 [-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 = "shmget02";
  56 int TST_TOTAL = 5;
  57 extern int Tst_count;
  58
  59 int exp_enos[] = {ENOENT, EEXIST, EINVAL, 0};   /* 0 terminated list of */
  60                                                 /* expected errnos      */
  61
  62 int shm_id_1 = -1;
  63 int shm_nonexisting_key = -1;
  64 int shmkey2;
  65
  66 struct test_case_t {
  67         int *skey;
  68         int size;
  69         int flags;
  70         int error;
  71 } TC[] = {
  72         /* EINVAL - size is 0 */
  73         {&shmkey2, 0, IPC_CREAT | IPC_EXCL | SHM_RW, EINVAL},
  74
  75         /* EINVAL - size is negative */
  76         {&shmkey2, -1, IPC_CREAT | IPC_EXCL | SHM_RW, EINVAL},
  77
  78         /* EINVAL - size is larger than created segment */
  79         {(int *)&shmkey, SHM_SIZE * 2, SHM_RW, EINVAL},
  80
  81         /* EEXIST - the segment exists and IPC_CREAT | IPC_EXCL is given */
  82         {(int *)&shmkey, SHM_SIZE, IPC_CREAT | IPC_EXCL | SHM_RW, EEXIST},
  83
  84         /* ENOENT - no segment exists for the key and IPC_CREAT is not given */
  85         /* use shm_id_2 (-1) as the key */
  86         {&shm_nonexisting_key, SHM_SIZE, SHM_RW, ENOENT}
  87 };
  88
  89 int main(int ac, char **av)
  90 {
  91         int lc;                         /* loop counter */
  92         char *msg;                      /* message returned from parse_opts */
  93         int i;
  94
  95         /* parse standard options */
  96         if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
  97                 tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
  98         }
  99
 100         setup();                        /* global setup */
 101
 102         /* The following loop checks looping state if -i option given */
 103
 104         for (lc = 0; TEST_LOOPING(lc); lc++) {
 105                 /* reset Tst_count in case we are looping */
 106                 Tst_count = 0;
 107
 108                 /* loop through the test cases */
 109                 for (i=0; i<TST_TOTAL; i++) {
 110                         /*
 111                          * Look for a failure ...
 112                          */
 113
 114                         TEST(shmget(*(TC[i].skey), TC[i].size, TC[i].flags));
 115
 116                         if (TEST_RETURN != -1) {
 117                                 tst_resm(TFAIL, "call succeeded unexpectedly");
 118                                 continue;
 119                         }
 120
 121                         TEST_ERROR_LOG(TEST_ERRNO);
 122
 123                         if (TEST_ERRNO == TC[i].error) {
 124                                 tst_resm(TPASS, "expected failure - errno = "
 125                                          "%d : %s", TEST_ERRNO,
 126                                          strerror(TEST_ERRNO));
 127                         } else {
 128                                 tst_resm(TFAIL, "call failed with an "
 129                                          "unexpected error - %d : %s",
 130                                          TEST_ERRNO, strerror(TEST_ERRNO));
 131                         }
 132                 }
 133         }
 134
 135         cleanup();
 136
 137         /*NOTREACHED*/
 138
 139         return(0);
 140 }
 141
 142 /*
 143  * setup() - performs all the ONE TIME setup for this test.
 144  */
 145 void
 146 setup(void)
 147 {
 148         /* capture signals */
 149         tst_sig(NOFORK, DEF_HANDLER, cleanup);
 150
 151         /* Set up the expected error numbers for -e option */
 152         TEST_EXP_ENOS(exp_enos);
 153
 154         /* Pause if that option was specified */
 155         TEST_PAUSE;
 156
 157         /*
 158          * Create a temporary directory and cd into it.
 159          * This helps to ensure that a unique msgkey is created.
 160          * See ../lib/libipc.c for more information.
 161          */
 162         tst_tmpdir();
 163
 164         /* get an IPC resource key */
 165         shmkey = getipckey();
 166
 167         shmkey2 = shmkey + 1;
 168
 169         if ((shm_id_1 = shmget(shmkey, SHM_SIZE, IPC_CREAT | IPC_EXCL |
 170              SHM_RW)) == -1) {
 171                 tst_brkm(TBROK, cleanup, "couldn't create shared memory "
 172                          "segment in setup()");
 173         }
 174
 175         /* Make sure shm_nonexisting_key is a nonexisting key */
 176         while(1) {
 177                 while(-1 != shmget(shm_nonexisting_key,1,SHM_RD)) {
 178                         shm_nonexisting_key--;
 179                 }
 180                 if(errno == ENOENT)
 181                         break;
 182         }
 183 }
 184
 185 /*
 186  * cleanup() - performs all the ONE TIME cleanup for this test at completion
 187  *             or premature exit.
 188  */
 189 void
 190 cleanup(void)
 191 {
 192         /* if it exists, remove the shared memory resource */
 193         rm_shm(shm_id_1);
 194
 195         /* Remove the temporary directory */
 196         tst_rmdir();
 197
 198         /*
 199          * print timing stats if that option was specified.
 200          * print errno log if that option was specified.
 201          */
 202         TEST_CLEANUP;
 203
 204         /* exit with return code appropriate for results */
 205         tst_exit();
 206 }
 207