test/ipc/shmget/shmget04.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  *      shmget04.c
  23  *
  24  * DESCRIPTION
  25  *      shmget04 - test for EACCES error
  26  *
  27  * ALGORITHM
  28  *      create a shared memory segment without read or write permissions
  29  *      loop if that option was specified
  30  *        call shmget() with SHM_RW flag using TEST() macro
  31  *        check the errno value
  32  *          issue a PASS message if we get EACCES
  33  *        otherwise, the tests fails
  34  *          issue a FAIL message
  35  *      call cleanup
  36  *
  37  * USAGE:  <for command-line>
  38  *  shmget04 [-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 #include <pwd.h>
  53 #include "ipcshm.h"
  54
  55 char *TCID = "shmget04";
  56 int TST_TOTAL = 1;
  57 extern int Tst_count;
  58
  59 int exp_enos[] = {EACCES, 0};   /* 0 terminated list of expected errnos */
  60
  61 char nobody_uid[] = "nobody";
  62 struct passwd *ltpuser;
  63
  64 int shm_id_1 = -1;
  65
  66 int main(int ac, char **av)
  67 {
  68         int lc;                         /* loop counter */
  69         char *msg;                      /* message returned from parse_opts */
  70
  71         /* parse standard options */
  72         if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
  73                 tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
  74         }
  75
  76         setup();                        /* global setup */
  77
  78         /* The following loop checks looping state if -i option given */
  79
  80         for (lc = 0; TEST_LOOPING(lc); lc++) {
  81                 /* reset Tst_count in case we are looping */
  82                 Tst_count = 0;
  83
  84                 /*
  85                  * use the TEST() macro to make the call
  86                  */
  87
  88                 TEST(shmget(shmkey, SHM_SIZE, SHM_RW));
  89
  90                 if (TEST_RETURN != -1) {
  91                         tst_resm(TFAIL, "call succeeded when error expected");
  92                         continue;
  93                 }
  94
  95                 TEST_ERROR_LOG(TEST_ERRNO);
  96
  97                 switch(TEST_ERRNO) {
  98                 case EACCES:
  99                         tst_resm(TPASS, "expected failure - errno = "
 100                                  "%d : %s", TEST_ERRNO, strerror(TEST_ERRNO));
 101                         break;
 102                 default:
 103                         tst_resm(TFAIL, "call failed with an "
 104                                  "unexpected error - %d : %s",
 105                                  TEST_ERRNO, strerror(TEST_ERRNO));
 106                         break;
 107                 }
 108         }
 109
 110         cleanup();
 111
 112         /*NOTREACHED*/
 113         return(0);
 114 }
 115
 116 /*
 117  * setup() - performs all the ONE TIME setup for this test.
 118  */
 119 void
 120 setup(void)
 121 {
 122         /* capture signals */
 123         tst_sig(NOFORK, DEF_HANDLER, cleanup);
 124
 125         /* Set up the expected error numbers for -e option */
 126         TEST_EXP_ENOS(exp_enos);
 127
 128         /* Pause if that option was specified */
 129         TEST_PAUSE;
 130
 131         /* Switch to nobody user for correct error code collection */
 132         if (geteuid() != 0) {
 133                 tst_brkm(TBROK, tst_exit, "Test must be run as root");
 134         }
 135
 136         /*
 137          * Create a temporary directory and cd into it.
 138          * This helps to ensure that a unique msgkey is created.
 139          * See ../lib/libipc.c for more information.
 140          */
 141         tst_tmpdir();
 142
 143         ltpuser = getpwnam(nobody_uid);
 144         if (seteuid(ltpuser->pw_uid) == -1) {
 145                 tst_resm(TINFO, "setuid failed to "
 146                          "to set the effective uid to %d",
 147                          ltpuser->pw_uid);
 148                 perror("seteuid");
 149         }
 150
 151
 152         /* get an IPC resource key */
 153         shmkey = getipckey();
 154
 155         /* create a shared memory segment without read or access permissions */
 156         if ((shm_id_1 = shmget(shmkey, SHM_SIZE, IPC_CREAT | IPC_EXCL)) == -1) {
 157                 tst_brkm(TBROK, cleanup, "Failed to create shared memory "
 158                          "segment in setup");
 159         }
 160 }
 161
 162 /*
 163  * cleanup() - performs all the ONE TIME cleanup for this test at completion
 164  *             or premature exit.
 165  */
 166 void
 167 cleanup(void)
 168 {
 169         /* if it exists, remove the shared memory resource */
 170         rm_shm(shm_id_1);
 171
 172         if (seteuid(0) == -1) {
 173                 tst_resm(TINFO, "setuid failed to "
 174                          "to set the effective uid to root");
 175                 perror("seteuid");
 176         }
 177
 178         /* Remove the temporary directory */
 179         tst_rmdir();
 180
 181         /*
 182          * print timing stats if that option was specified.
 183          * print errno log if that option was specified.
 184          */
 185         TEST_CLEANUP;
 186
 187         /* exit with return code appropriate for results */
 188         tst_exit();
 189 }
 190