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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  *	semget02.c
     23  *
     24  * DESCRIPTION
     25  *	semget02 - test for EACCES and EEXIST errors
     26  *
     27  * ALGORITHM
     28  *	create a semaphore set without read or alter permissions
     29  *	loop if that option was specified
     30  *	call semget() using two different invalid cases
     31  *	check the errno value
     32  *	  issue a PASS message if we get EACCES or EEXIST
     33  *	otherwise, the tests fails
     34  *	  issue a FAIL message
     35  *	call cleanup
     36  *
     37  * USAGE:  <for command-line>
     38  *  semget02 [-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 
     54 #include "../lib/ipcsem.h"
     55 
     56 char *TCID = "semget02";
     57 int TST_TOTAL = 2;
     58 
     59 char nobody_uid[] = "nobody";
     60 struct passwd *ltpuser;
     61 
     62 int sem_id_1 = -1;
     63 
     64 struct test_case_t {
     65 	int flags;
     66 	int error;
     67 } TC[] = {
     68 	/* EACCES - the semaphore has no read or alter permissions */
     69 	{
     70 	SEM_RA, EACCES},
     71 	    /* EEXIST - the semaphore id exists and semget() was called with  */
     72 	    /* IPC_CREAT and IPC_EXCL                                         */
     73 	{
     74 	IPC_CREAT | IPC_EXCL, EEXIST}
     75 };
     76 
     77 int main(int ac, char **av)
     78 {
     79 	int lc;
     80 	int i;
     81 
     82 	tst_parse_opts(ac, av, NULL, NULL);
     83 
     84 	setup();		/* global setup */
     85 
     86 	/* The following loop checks looping state if -i option given */
     87 
     88 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     89 		/* reset tst_count in case we are looping */
     90 		tst_count = 0;
     91 
     92 		for (i = 0; i < TST_TOTAL; i++) {
     93 			/* use the TEST macro to make the call */
     94 
     95 			TEST(semget(semkey, PSEMS, TC[i].flags));
     96 
     97 			if (TEST_RETURN != -1) {
     98 				sem_id_1 = TEST_RETURN;
     99 				tst_resm(TFAIL, "call succeeded");
    100 				continue;
    101 			}
    102 
    103 			if (TEST_ERRNO == TC[i].error) {
    104 				tst_resm(TPASS, "expected failure - errno "
    105 					 "= %d : %s", TEST_ERRNO,
    106 					 strerror(TEST_ERRNO));
    107 			} else {
    108 				tst_resm(TFAIL, "unexpected error - %d : %s",
    109 					 TEST_ERRNO, strerror(TEST_ERRNO));
    110 			}
    111 		}
    112 	}
    113 
    114 	cleanup();
    115 
    116 	tst_exit();
    117 }
    118 
    119 /*
    120  * setup() - performs all the ONE TIME setup for this test.
    121  */
    122 void setup(void)
    123 {
    124 	tst_require_root();
    125 
    126 	/* Switch to nobody user for correct error code collection */
    127 	ltpuser = getpwnam(nobody_uid);
    128 	if (seteuid(ltpuser->pw_uid) == -1) {
    129 		tst_resm(TINFO, "setreuid failed to "
    130 			 "to set the effective uid to %d", ltpuser->pw_uid);
    131 		perror("setreuid");
    132 	}
    133 
    134 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
    135 
    136 	TEST_PAUSE;
    137 
    138 	/*
    139 	 * Create a temporary directory and cd into it.
    140 	 * This helps to ensure that a unique msgkey is created.
    141 	 * See ../lib/libipc.c for more information.
    142 	 */
    143 	tst_tmpdir();
    144 
    145 	/* get an IPC resource key */
    146 	semkey = getipckey();
    147 
    148 	/* create a semaphore set without read or alter permissions */
    149 	if ((sem_id_1 = semget(semkey, PSEMS, IPC_CREAT | IPC_EXCL)) == -1) {
    150 		tst_brkm(TBROK, cleanup, "couldn't create semaphore in setup");
    151 	}
    152 }
    153 
    154 /*
    155  * cleanup() - performs all the ONE TIME cleanup for this test at completion
    156  * 	       or premature exit.
    157  */
    158 void cleanup(void)
    159 {
    160 	/* if it exists, remove the semaphore resource */
    161 	rm_sema(sem_id_1);
    162 
    163 	tst_rmdir();
    164 
    165 }
    166