250 lines
6 KiB
C
250 lines
6 KiB
C
/*
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*
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* Copyright (c) International Business Machines Corp., 2001
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* NAME
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* shmdt01.c
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*
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* DESCRIPTION
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* shmdt01 - check that shared memory is detached correctly
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*
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* ALGORITHM
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* create a shared memory resource of size sizeof(int)
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* attach it to the current process and give it a value
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* call shmdt() using the TEST macro
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* check the return code
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* if failure, issue a FAIL message.
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* otherwise,
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* if doing functionality testing
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* attempt to write a value to the shared memory address
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* this should generate a SIGSEGV which will be caught in
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* the signal handler
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* if correct,
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* issue a PASS message
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* otherwise
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* issue a FAIL message
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* call cleanup
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*
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* USAGE: <for command-line>
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* shmdt01 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
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* where, -c n : Run n copies concurrently.
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* -f : Turn off functionality Testing.
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* -I x : Execute test for x seconds.
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* -P x : Pause for x seconds between iterations.
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* -t : Turn on syscall timing.
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*
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* HISTORY
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* 03/2001 - Written by Wayne Boyer
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*
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* RESTRICTIONS
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* none
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*/
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#include <setjmp.h>
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#include "ipcshm.h"
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char *TCID = "shmdt01";
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int TST_TOTAL = 1;
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extern int Tst_count;
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void sighandler(int);
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struct shmid_ds buf;
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int shm_id_1 = -1;
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int *shared; /* variable to use for shared memory attach */
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int new;
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int pass = 0;
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sigjmp_buf env;
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int main(int ac, char **av)
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{
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int lc; /* loop counter */
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char *msg; /* message returned from parse_opts */
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void check_functionality(void);
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/* parse standard options */
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if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
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tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
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}
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setup(); /* global setup */
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/* The following loop checks looping state if -i option given */
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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/* reset Tst_count in case we are looping */
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Tst_count = 0;
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/*
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* Use TEST macro to make the shmdt() call
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*/
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TEST(shmdt((const void *)shared));
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if (TEST_RETURN == -1) {
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tst_resm(TFAIL, "%s call failed - errno = %d : %s",
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TCID, TEST_ERRNO, strerror(TEST_ERRNO));
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} else {
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if (STD_FUNCTIONAL_TEST) {
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check_functionality();
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} else {
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tst_resm(TPASS, "call succeeded");
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}
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}
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/* reattach the shared memory segment in case we are looping */
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shared = (int *)shmat(shm_id_1, 0, 0);
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if (*shared == -1) {
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tst_brkm(TBROK, cleanup, "memory reattach failed");
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}
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/* also reset pass */
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pass = 0;
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}
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cleanup();
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/*NOTREACHED*/
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return(0);
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}
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/*
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* check_functionality() - make sure the memory is detached correctly
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*/
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void
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check_functionality(void)
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{
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/* stat the shared memory segment */
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if (shmctl(shm_id_1, IPC_STAT, &buf) == -1) {
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tst_resm(TINFO, "error = %d : %s", errno, strerror(errno));
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tst_brkm(TBROK, cleanup, "could not stat in signal handler");
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}
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if (buf.shm_nattch != 0) {
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tst_resm(TFAIL, "# of attaches is incorrect");
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return;
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}
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/*
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* Try writing to the shared memory. This should generate a
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* SIGSEGV which will be caught below.
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*
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* This is wrapped by the sigsetjmp() call that will take care of
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* restoring the program's context in an elegant way in conjunction
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* with the call to siglongjmp() in the signal handler.
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*
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* An attempt to do the assignment without using the sigsetjmp()
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* and siglongjmp() calls will result in an infinite loop. Program
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* control is returned to the assignment statement after the execution
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* of the signal handler and another SIGSEGV will be generated.
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*/
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if (sigsetjmp(env, 1) == 0) {
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*shared = 2;
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}
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if (pass) {
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tst_resm(TPASS, "shared memory detached correctly");
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} else {
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tst_resm(TFAIL, "shared memory was not detached correctly");
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}
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}
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/*
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* sighandler()
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*/
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void
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sighandler(sig)
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{
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/* if we have received a SIGSEGV, we are almost done */
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if (sig == SIGSEGV) {
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/* set the global variable and jump back */
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pass = 1;
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siglongjmp(env, 1);
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} else {
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tst_brkm(TBROK, cleanup, "received an unexpected signal");
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}
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}
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/*
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* setup() - performs all the ONE TIME setup for this test.
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*/
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void
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setup(void)
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{
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/* capture signals */
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tst_sig(NOFORK, sighandler, cleanup);
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/* Pause if that option was specified */
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TEST_PAUSE;
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/*
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* Create a temporary directory and cd into it.
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* This helps to ensure that a unique msgkey is created.
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* See ../lib/libipc.c for more information.
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*/
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tst_tmpdir();
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/* get an IPC resource key */
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shmkey = getipckey();
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/* create a shared memory resource with read and write permissions */
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if ((shm_id_1 = shmget(shmkey, INT_SIZE, SHM_RW | IPC_CREAT |
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IPC_EXCL)) == -1) {
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tst_brkm(TBROK, cleanup, "Failed to create shared memory "
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"resource in setup()");
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}
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/* attach the shared memory segment */
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shared = (int *)shmat(shm_id_1, 0, 0);
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if (*shared == -1) {
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tst_brkm(TBROK, cleanup, "Couldn't attach shared memory");
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}
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/* give a value to the shared memory integer */
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*shared = 4;
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}
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/*
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* cleanup() - performs all the ONE TIME cleanup for this test at completion
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* or premature exit.
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*/
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void
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cleanup(void)
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{
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/* if it exists, delete the shared memory resource */
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rm_shm(shm_id_1);
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/* Remove the temporary directory */
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tst_rmdir();
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/*
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* print timing stats if that option was specified.
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* print errno log if that option was specified.
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*/
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TEST_CLEANUP;
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/* exit with return code appropriate for results */
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tst_exit();
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}
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