minix/test/ipc/shmctl/shmctl03.c
2009-09-21 14:53:53 +00:00

233 lines
5.5 KiB
C

/*
*
* 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
* shmctl03.c
*
* DESCRIPTION
* shmctl03 - check for EACCES, and EPERM errors
*
* 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 "ltpuser1"
* call do_child()
* loop if that option was specified
* call shmctl() using three different invalid cases
* check the errno value
* issue a PASS message if we get EACCES or EPERM
* 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>
* shmctl03 [-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 as root
*/
#include "ipcshm.h"
#include <sys/types.h>
#include <sys/wait.h>
char *TCID = "shmctl03";
extern int Tst_count;
int exp_enos[] = {EACCES, EPERM, 0}; /* 0 terminated list of */
/* expected errnos */
int shm_id_1 = -1;
uid_t ltp_uid;
char *ltp_user = "nobody";
struct shmid_ds buf;
struct test_case_t {
int *shmid;
int cmd;
struct shmid_ds *sbuf;
int error;
} TC[] = {
/* EACCES - child has no read permission for segment */
{&shm_id_1, IPC_STAT, &buf, EACCES},
/* EPERM - IPC_SET - child doesn't have permission to change segment */
{&shm_id_1, IPC_SET, &buf, EPERM},
/* EPERM - IPC_RMID - child can not remove the segment */
{&shm_id_1, IPC_RMID, &buf, EPERM},
};
int TST_TOTAL = (sizeof(TC) / sizeof(*TC));
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 {
/* 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 call as the child process
*/
void
do_child(void)
{
int i, 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;
/* loop through the test cases */
for (i=0; i<TST_TOTAL; i++) {
/*
* use the TEST() macro to make the call
*/
TEST(shmctl(*(TC[i].shmid), TC[i].cmd, TC[i].sbuf));
if (TEST_RETURN != -1) {
tst_resm(TFAIL, "call succeeded unexpectedly");
continue;
}
TEST_ERROR_LOG(TEST_ERRNO);
if (TEST_ERRNO == TC[i].error) {
tst_resm(TPASS, "expected failure - errno = "
"%d : %s", TEST_ERRNO,
strerror(TEST_ERRNO));
} else {
tst_resm(TFAIL, "call failed with an "
"unexpected error - %d : %s",
TEST_ERRNO, strerror(TEST_ERRNO));
}
}
}
}
/*
* 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, IPC_CREAT | IPC_EXCL |
SHM_RW)) == -1) {
tst_brkm(TBROK, cleanup, "couldn't 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();
}