minix/test/ipc/shmat/shmat03.c

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2009-09-21 16:53:53 +02:00
/*
*
* Copyright (c) International Business Machines Corp., 2001
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* NAME
* shmat03.c
*
* DESCRIPTION
* shmat03 - test for EACCES error
*
* ALGORITHM
* create a shared memory segment with root only read & write permissions
* fork a child process
* if child
* set the ID of the child process to that of "nobody"
* loop if that option was specified
* call shmat() using the TEST() macro
* check the errno value
* issue a PASS message if we get EACCES
* otherwise, the tests fails
* issue a FAIL message
* call cleanup
* if parent
* wait for child to exit
* remove the shared memory segment
*
* USAGE: <for command-line>
* shmat03 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
* where, -c n : Run n copies concurrently.
* -e : Turn on errno logging.
* -i n : Execute test n times.
* -I x : Execute test for x seconds.
* -P x : Pause for x seconds between iterations.
* -t : Turn on syscall timing.
*
* HISTORY
* 03/2001 - Written by Wayne Boyer
*
* RESTRICTIONS
* test must be run at root
*/
#include "ipcshm.h"
char *TCID = "shmat03";
int TST_TOTAL = 1;
extern int Tst_count;
int exp_enos[] = {EACCES, 0}; /* 0 terminated list of expected errnos */
int shm_id_1 = -1;
void *addr; /* for result of shmat-call */
uid_t ltp_uid;
char *ltp_user = "nobody";
int main(int ac, char **av)
{
char *msg; /* message returned from parse_opts */
int pid;
void do_child(void);
/* parse standard options */
if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
}
setup(); /* global setup */
if ((pid = FORK_OR_VFORK()) == -1) {
tst_brkm(TBROK, cleanup, "could not fork");
}
if (pid == 0) { /* child */
/* set the user ID of the child to the non root user */
if (setuid(ltp_uid) == -1) {
tst_resm(TBROK, "setuid() failed");
exit(1);
}
do_child();
} else { /* parent */
/* wait for the child to return */
if (waitpid(pid, NULL, 0) == -1) {
tst_brkm(TBROK, cleanup, "waitpid failed");
}
/* if it exists, remove the shared memory resource */
rm_shm(shm_id_1);
/* Remove the temporary directory */
tst_rmdir();
}
cleanup();
return(0);
}
/*
* do_child - make the TEST call as the child process
*/
void
do_child(void)
{
int lc;
/* The following loop checks looping state if -i option given */
for (lc = 0; TEST_LOOPING(lc); lc++) {
/* reset Tst_count in case we are looping */
Tst_count = 0;
/*
* use TEST macro to make the call
*/
errno = 0;
addr = shmat(shm_id_1, (const void *)0, 0);
TEST_ERRNO = errno;
if (addr != (char *)-1) {
tst_resm(TFAIL, "call succeeded when error expected");
continue;
}
TEST_ERROR_LOG(TEST_ERRNO);
switch(TEST_ERRNO) {
case EACCES:
tst_resm(TPASS, "expected failure - errno = "
"%d : %s", TEST_ERRNO,
strerror(TEST_ERRNO));
break;
default:
tst_resm(TFAIL, "call failed with an "
"unexpected error - %d : %s",
TEST_ERRNO, strerror(TEST_ERRNO));
break;
}
}
}
/*
* setup() - performs all the ONE TIME setup for this test.
*/
void
setup(void)
{
/* check for root as process owner */
check_root();
/* capture signals */
tst_sig(FORK, DEF_HANDLER, cleanup);
/* Set up the expected error numbers for -e option */
TEST_EXP_ENOS(exp_enos);
/* Pause if that option was specified */
TEST_PAUSE;
/*
* Create a temporary directory and cd into it.
* This helps to ensure that a unique msgkey is created.
* See ../lib/libipc.c for more information.
*/
tst_tmpdir();
/* get an IPC resource key */
shmkey = getipckey();
/* create a shared memory segment with read and write permissions */
if ((shm_id_1 = shmget(shmkey, SHM_SIZE,
SHM_RW | IPC_CREAT | IPC_EXCL)) == -1) {
tst_brkm(TBROK, cleanup, "Failed to create shared memory "
"segment in setup");
}
/* get the userid for a non root user */
ltp_uid = getuserid(ltp_user);
}
/*
* cleanup() - performs all the ONE TIME cleanup for this test at completion
* or premature exit.
*/
void
cleanup(void)
{
/*
* print timing stats if that option was specified.
* print errno log if that option was specified.
*/
TEST_CLEANUP;
/* exit with return code appropriate for results */
tst_exit();
}