minix3/tests/ipc/shmdt/shmdt01.c

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/*
*
* 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
* shmdt01.c
*
* DESCRIPTION
* shmdt01 - check that shared memory is detached correctly
*
* ALGORITHM
* create a shared memory resource of size sizeof(int)
* attach it to the current process and give it a value
* call shmdt() using the TEST macro
* check the return code
* if failure, issue a FAIL message.
* otherwise,
* if doing functionality testing
* attempt to write a value to the shared memory address
* this should generate a SIGSEGV which will be caught in
* the signal handler
* if correct,
* issue a PASS message
* otherwise
* issue a FAIL message
* call cleanup
*
* USAGE: <for command-line>
* shmdt01 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
* where, -c n : Run n copies concurrently.
* -f : Turn off functionality Testing.
* -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
* none
*/
#include <setjmp.h>
#include "ipcshm.h"
char *TCID = "shmdt01";
int TST_TOTAL = 1;
extern int Tst_count;
void sighandler(int);
struct shmid_ds buf;
int shm_id_1 = -1;
int *shared; /* variable to use for shared memory attach */
int new;
int pass = 0;
sigjmp_buf env;
int main(int ac, char **av)
{
int lc; /* loop counter */
char *msg; /* message returned from parse_opts */
void check_functionality(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 */
/* 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 shmdt() call
*/
TEST(shmdt((const void *)shared));
if (TEST_RETURN == -1) {
tst_resm(TFAIL, "%s call failed - errno = %d : %s",
TCID, TEST_ERRNO, strerror(TEST_ERRNO));
} else {
if (STD_FUNCTIONAL_TEST) {
check_functionality();
} else {
tst_resm(TPASS, "call succeeded");
}
}
/* reattach the shared memory segment in case we are looping */
shared = (int *)shmat(shm_id_1, 0, 0);
if (*shared == -1) {
tst_brkm(TBROK, cleanup, "memory reattach failed");
}
/* also reset pass */
pass = 0;
}
cleanup();
/*NOTREACHED*/
return(0);
}
/*
* check_functionality() - make sure the memory is detached correctly
*/
void
check_functionality(void)
{
/* stat the shared memory segment */
if (shmctl(shm_id_1, IPC_STAT, &buf) == -1) {
tst_resm(TINFO, "error = %d : %s", errno, strerror(errno));
tst_brkm(TBROK, cleanup, "could not stat in signal handler");
}
if (buf.shm_nattch != 0) {
tst_resm(TFAIL, "# of attaches is incorrect");
return;
}
/*
* Try writing to the shared memory. This should generate a
* SIGSEGV which will be caught below.
*
* This is wrapped by the sigsetjmp() call that will take care of
* restoring the program's context in an elegant way in conjunction
* with the call to siglongjmp() in the signal handler.
*
* An attempt to do the assignment without using the sigsetjmp()
* and siglongjmp() calls will result in an infinite loop. Program
* control is returned to the assignment statement after the execution
* of the signal handler and another SIGSEGV will be generated.
*/
if (sigsetjmp(env, 1) == 0) {
*shared = 2;
}
if (pass) {
tst_resm(TPASS, "shared memory detached correctly");
} else {
tst_resm(TFAIL, "shared memory was not detached correctly");
}
}
/*
* sighandler()
*/
void
sighandler(sig)
{
/* if we have received a SIGSEGV, we are almost done */
if (sig == SIGSEGV) {
/* set the global variable and jump back */
pass = 1;
siglongjmp(env, 1);
} else {
tst_brkm(TBROK, cleanup, "received an unexpected signal");
}
}
/*
* setup() - performs all the ONE TIME setup for this test.
*/
void
setup(void)
{
/* capture signals */
tst_sig(NOFORK, sighandler, cleanup);
/* 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 resource with read and write permissions */
if ((shm_id_1 = shmget(shmkey, INT_SIZE, SHM_RW | IPC_CREAT |
IPC_EXCL)) == -1) {
tst_brkm(TBROK, cleanup, "Failed to create shared memory "
"resource in setup()");
}
/* attach the shared memory segment */
shared = (int *)shmat(shm_id_1, 0, 0);
if (*shared == -1) {
tst_brkm(TBROK, cleanup, "Couldn't attach shared memory");
}
/* give a value to the shared memory integer */
*shared = 4;
}
/*
* cleanup() - performs all the ONE TIME cleanup for this test at completion
* or premature exit.
*/
void
cleanup(void)
{
/* if it exists, delete the shared memory resource */
rm_shm(shm_id_1);
/* Remove the temporary directory */
tst_rmdir();
/*
* 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();
}