test/ipc/semop/semop02.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  *      semop02.c
  23  *
  24  * DESCRIPTION
  25  *      semop02 - test for E2BIG, EACCES, EFAULT and EINVAL errors
  26  *
  27  * ALGORITHM
  28  *      create a semaphore set with read and alter permissions
  29  *      create a semaphore set without read and alter permissions
  30  *      loop if that option was specified
  31  *      call semop with five different invalid cases
  32  *      check the errno value
  33  *        issue a PASS message if we get E2BIG, EACCES, EFAULT or EINVAL
  34  *      otherwise, the tests fails
  35  *        issue a FAIL message
  36  *      call cleanup
  37  *
  38  * USAGE:  <for command-line>
  39  *  semop02 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
  40  *     where,  -c n : Run n copies concurrently.
  41  *             -e   : Turn on errno logging.
  42  *             -i n : Execute test n times.
  43  *             -I x : Execute test for x seconds.
  44  *             -P x : Pause for x seconds between iterations.
  45  *             -t   : Turn on syscall timing.
  46  *
  47  * HISTORY
  48  *      03/2001 - Written by Wayne Boyer
  49  *
  50  * RESTRICTIONS
  51  *      none
  52  */
  53 #include <pwd.h>
  54
  55 #include "ipcsem.h"
  56
  57 char *TCID = "semop02";
  58 int TST_TOTAL = 4;
  59 extern int Tst_count;
  60
  61 int exp_enos[] = {E2BIG, EACCES, EFAULT, EINVAL, 0};
  62
  63 int sem_id_1 = -1;      /* a semaphore set with read & alter permissions */
  64 int sem_id_2 = -1;      /* a semaphore set without read & alter permissions */
  65 int bad_id = -1;
  66 char nobody_uid[] = "nobody";
  67 struct passwd *ltpuser;
  68
  69 struct sembuf s_buf[PSEMS];
  70
  71 int badbuf = -1;
  72
  73 #define NSOPS   5               /* a resonable number of operations */
  74 #define BIGOPS  1024            /* a value that is too large for the number */
  75                                 /* of semop operations that are permitted   */
  76
  77 struct test_case_t {
  78         int *semid;             /* the semaphore id */
  79         struct sembuf *t_sbuf;  /* the first in an array of sembuf structures */
  80         unsigned t_ops;         /* the number of elements in the above array */
  81         int error;              /* the expected error number */
  82 } TC[] = {
  83         /* E2BIG - the number of operations is too big */
  84         {&sem_id_1, (struct sembuf *)&s_buf, BIGOPS, E2BIG},
  85
  86         /* EACCES - the semaphore set has no access permission */
  87         {&sem_id_2, (struct sembuf *)&s_buf, NSOPS, EACCES},
  88
  89         /* EINVAL - the number of elments (t_ops) is 0 */
  90         {&sem_id_1, (struct sembuf *)&s_buf, 0, EINVAL},
  91
  92         /* EINVAL - the semaphore set doesn't exist */
  93         {&bad_id, (struct sembuf *)&s_buf, NSOPS, EINVAL}
  94 };
  95
  96 int main(int ac, char **av)
  97 {
  98         int lc;                         /* loop counter */
  99         char *msg;                      /* message returned from parse_opts */
 100         int i;
 101
 102         /* parse standard options */
 103         if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
 104                 tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
 105         }
 106
 107         setup();                        /* global setup */
 108
 109         /* The following loop checks looping state if -i option given */
 110
 111         for (lc = 0; TEST_LOOPING(lc); lc++) {
 112                 /* reset Tst_count in case we are looping */
 113                 Tst_count = 0;
 114
 115                 for (i=0; i<TST_TOTAL; i++) {
 116                         /*
 117                          * use the TEST macro to make the call
 118                          */
 119
 120                         TEST(semop(*(TC[i].semid), TC[i].t_sbuf, TC[i].t_ops));
 121
 122                         if (TEST_RETURN != -1) {
 123                                 tst_resm(TFAIL, "call succeeded unexpectedly");
 124                                 continue;
 125                         }
 126
 127                         TEST_ERROR_LOG(TEST_ERRNO);
 128
 129                         if (TEST_ERRNO == TC[i].error) {
 130                                 tst_resm(TPASS, "expected failure - errno = "
 131                                          "%d : %s", TEST_ERRNO,
 132                                          strerror(TEST_ERRNO));
 133                         } else {
 134                                 tst_resm(TFAIL, "unexpected error - "
 135                                          "%d : %s", TEST_ERRNO,
 136                                          strerror(TEST_ERRNO));
 137                         }
 138                 }
 139         }
 140
 141         cleanup();
 142
 143         /*NOTREACHED*/
 144         return(0);
 145 }
 146
 147 /*
 148  * setup() - performs all the ONE TIME setup for this test.
 149  */
 150 void
 151 setup(void)
 152 {
 153         /* Switch to nobody user for correct error code collection */
 154         if (geteuid() != 0) {
 155                 tst_brkm(TBROK, tst_exit, "Test must be run as root");
 156         }
 157
 158         /* capture signals */
 159         tst_sig(NOFORK, DEF_HANDLER, cleanup);
 160
 161         /* Set up the expected error numbers for -e option */
 162         TEST_EXP_ENOS(exp_enos);
 163
 164         /* Pause if that option was specified */
 165         TEST_PAUSE;
 166
 167         /*
 168          * Create a temporary directory and cd into it.
 169          * This helps to ensure that a unique msgkey is created.
 170          * See ../lib/libipc.c for more information.
 171          */
 172         tst_tmpdir();
 173
 174         ltpuser = getpwnam(nobody_uid);
 175         if (seteuid(ltpuser->pw_uid) == -1) {
 176                 tst_resm(TINFO, "setreuid failed to "
 177                                 "to set the effective uid to %d",
 178                                 ltpuser->pw_uid);
 179                 perror("setreuid");
 180         }
 181
 182         /* get an IPC resource key */
 183         semkey = getipckey();
 184
 185         /* create a semaphore set with read and alter permissions */
 186         if ((sem_id_1 =
 187              semget(semkey, PSEMS, IPC_CREAT | IPC_EXCL | SEM_RA)) == -1) {
 188                 tst_brkm(TBROK, cleanup, "couldn't create semaphore in setup");
 189         }
 190
 191         /* increment the semkey */
 192         semkey += 1;
 193
 194         /* create a semaphore set without read and alter permissions */
 195         if ((sem_id_2 = semget(semkey, PSEMS, IPC_CREAT | IPC_EXCL)) == -1) {
 196                 tst_brkm(TBROK, cleanup, "couldn't create semaphore in setup");
 197         }
 198 }
 199
 200 /*
 201  * cleanup() - performs all the ONE TIME cleanup for this test at completion
 202  *             or premature exit.
 203  */
 204 void
 205 cleanup(void)
 206 {
 207         /* if they exist, remove the semaphore resources */
 208         rm_sema(sem_id_1);
 209         rm_sema(sem_id_2);
 210
 211         /* Remove the temporary directory */
 212         seteuid(getuid());
 213         tst_rmdir();
 214
 215         /*
 216          * print timing stats if that option was specified.
 217          * print errno log if that option was specified.
 218          */
 219         TEST_CLEANUP;
 220
 221         /* exit with return code appropriate for results */
 222         tst_exit();
 223 }
 224