minix/test/ipc/shmctl/shmctl01.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
* shmctl01.c
*
* DESCRIPTION
* shmctl01 - test the IPC_STAT, IPC_SET and IPC_RMID commands as
* they are used with shmctl()
*
* ALGORITHM
* loop if that option was specified
* create a shared memory segment with read and write permission
* set up any test case specific conditions
* call shmctl() using the TEST macro
* check the return code
* if failure, issue a FAIL message.
* otherwise,
* if doing functionality testing
* call the correct test function
* if the conditions are correct,
* issue a PASS message
* otherwise
* issue a FAIL message
* otherwise
* issue a PASS message
* call cleanup
*
* USAGE: <for command-line>
* shmctl01 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
* where, -c n : Run n copies concurrently.
* -f : Turn off functionality Testing.
* -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
* none
*/
#include "ipcshm.h"
char *TCID = "shmctl01";
extern int Tst_count;
int shm_id_1 = -1;
struct shmid_ds buf;
long save_time;
#define FIRST 0
#define SECOND 1
int stat_time; /* set to either FIRST or SECOND for IPC_STAT tests */
void *set_shared;
#define N_ATTACH 4
pid_t pid_arr[N_ATTACH];
void sighandler(int);
/*
* These are the various setup and check functions for the commands
* that we are checking.
*/
/* Setup, cleanup and check routines for IPC_STAT */
void stat_setup(void), func_stat(void);
void stat_cleanup(void);
/* Setup and check routines for IPC_SET */
void set_setup(void), func_set(void);
/* Check routine for IPC_RMID */
void func_rmid(void);
/* Child function */
void do_child(void);
struct test_case_t {
int cmd; /* the command to test */
void (*func_test)(void); /* the test function */
void (*func_setup)(void); /* the setup function if necessary */
} TC[] = {
{IPC_STAT, func_stat, stat_setup},
#ifndef UCLINUX
/* The second test is not applicable to uClinux; shared memory segments
are detached on exec(), so cannot be passed to uClinux children. */
{IPC_STAT, func_stat, stat_setup},
#endif
{IPC_SET, func_set, set_setup},
{IPC_RMID, func_rmid, NULL}
};
int TST_TOTAL = (sizeof(TC) / sizeof(*TC));
#define NEWMODE 0066
#ifdef UCLINUX
static char *argv0;
#endif
static int stat_i; /* Shared between do_child and stat_setup */
int main(int ac, char **av)
{
int lc; /* loop counter */
char *msg; /* message returned from parse_opts */
int i;
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);
}
#ifdef UCLINUX
argv0 = av[0];
maybe_run_child(do_child, "ddd", &stat_i, &stat_time, &shm_id_1);
#endif
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;
/* initialize stat_time */
stat_time = FIRST;
/*
* Create a shared memory segment with read and write
* permissions. Do this here instead of in setup()
* so that looping (-i) will work correctly.
*/
if ((shm_id_1 = shmget(shmkey, SHM_SIZE, IPC_CREAT | IPC_EXCL |
SHM_RW)) == -1) {
tst_brkm(TBROK, cleanup, "couldn't create the shared"
" memory segment");
}
/* loop through the test cases */
for (i=0; i<TST_TOTAL; i++) {
/*
* if needed, set up any required conditions by
* calling the appropriate setup function
*/
if (TC[i].func_setup != NULL) {
(*TC[i].func_setup)();
}
/*
* Use TEST macro to make the call
*/
TEST(shmctl(shm_id_1, TC[i].cmd, &buf));
if (TEST_RETURN == -1) {
tst_resm(TFAIL, "%s call failed - errno "
"= %d : %s", TCID, TEST_ERRNO,
strerror(TEST_ERRNO));
continue;
}
if (STD_FUNCTIONAL_TEST) {
(*TC[i].func_test)();
} else {
tst_resm(TPASS, "call succeeded");
/* now perform command related cleanup */
switch(TC[i].cmd) {
case IPC_STAT:
stat_cleanup();
break;
case IPC_RMID:
shm_id_1 = -1;
break;
}
}
}
}
cleanup();
/*NOTREACHED*/
return(0);
}
/*
* set_shmat() - Attach the shared memory and return the pointer. Use
* this seperate routine to avoid code duplication in
* stat_setup() below.
*/
void *
set_shmat(void)
{
void *rval;
/* attach the shared memory */
rval = shmat(shm_id_1, 0, 0);
/*
* if shmat() fails, the only thing we can do is
* print a message to that effect.
*/
if (rval == (void *)-1) {
tst_resm(TBROK, "shmat() failed - %s", strerror(errno));
cleanup();
}
return rval;
}
/*
* stat_setup() - Set up for the IPC_STAT command with shmctl().
* Make things interesting by forking some children
* that will either attach or inherit the shared memory.
*/
void
stat_setup(void)
{
void *set_shmat(void);
pid_t pid;
/*
* The first time through, let the children attach the memory.
* The second time through, attach the memory first and let
* the children inherit the memory.
*/
if (stat_time == SECOND) {
/*
* use the global "set_shared" variable here so that
* it can be removed in the stat_func() routine.
*/
set_shared = set_shmat();
}
tst_flush();
for (stat_i=0; stat_i<N_ATTACH; stat_i++) {
if ((pid = fork()) == -1) {
tst_brkm(TBROK, cleanup, "could not fork");
}
if (pid == 0) { /* child */
#ifdef UCLINUX
if (self_exec(argv0, "ddd", stat_i, stat_time,
shm_id_1) < 0) {
tst_brkm(TBROK, cleanup, "could not self_exec");
}
#else
do_child();
#endif
} else { /* parent */
/* save the child's pid for cleanup later */
pid_arr[stat_i] = pid;
}
}
/* sleep briefly to ensure correct execution order */
usleep(250000);
}
/*
* do_child
*/
void
do_child()
{
int rval;
void *test;
if (stat_time == FIRST) {
test = set_shmat();
} else {
test = set_shared;
}
/* do an assignement for fun */
*(int *)test = stat_i;
/* pause until we get a signal from stat_cleanup() */
rval = pause();
/* now we're back - detach the memory and exit */
if (shmdt(test) == -1) {
tst_resm(TBROK, "shmdt() failed - %d", errno);
}
tst_exit();
}
/*
* func_stat() - check the functionality of the IPC_STAT command with shmctl()
* by looking at the pid of the creator, the segement size,
* the number of attaches and the mode.
*/
void
func_stat()
{
int fail = 0;
pid_t pid;
/* check perm, pid, nattach and size */
pid = getpid();
if (buf.shm_cpid != pid) {
tst_resm(TFAIL, "creator pid is incorrect");
fail = 1;
}
if (!fail && buf.shm_segsz != SHM_SIZE) {
tst_resm(TFAIL, "segment size is incorrect");
fail = 1;
}
/*
* The first time through, only the children attach the memory, so
* the attaches equal N_ATTACH + stat_time (0). The second time
* through, the parent attaches the memory and the children inherit
* that memory so the attaches equal N_ATTACH + stat_time (1).
*/
if (!fail && buf.shm_nattch != N_ATTACH + stat_time) {
tst_resm(TFAIL, "# of attaches is incorrect - %d",
buf.shm_nattch);
fail = 1;
}
/* use MODE_MASK to make sure we are comparing the last 9 bits */
if (!fail && (buf.shm_perm.mode & MODE_MASK) != ((SHM_RW) & MODE_MASK)) {
tst_resm(TFAIL, "segment mode is incorrect");
fail = 1;
}
stat_cleanup();
/* save the change time for use in the next test */
save_time = buf.shm_ctime;
if (fail) {
return;
}
tst_resm(TPASS, "pid, size, # of attaches and mode are correct "
"- pass #%d", stat_time);
}
/*
* stat_cleanup() - signal the children to clean up after themselves and
* have the parent make dessert, er, um, make that remove
* the shared memory that is no longer needed.
*/
void
stat_cleanup()
{
int i;
/* wake up the childern so they can detach the memory and exit */
for (i=0; i<N_ATTACH; i++) {
if(kill(pid_arr[i], SIGUSR1) == -1) {
tst_brkm(TBROK, cleanup, "kill failed");
}
}
/* remove the parent's shared memory the second time through */
if (stat_time == SECOND) {
if (shmdt(set_shared) == -1) {
tst_resm(TINFO, "shmdt() failed");
}
}
stat_time++;
}
/*
* set_setup() - set up for the IPC_SET command with shmctl()
*/
void
set_setup()
{
/* set up a new mode for the shared memory segment */
buf.shm_perm.mode = SHM_RW | NEWMODE;
/* sleep for one second to get a different shm_ctime value */
sleep(1);
}
/*
* func_set() - check the functionality of the IPC_SET command with shmctl()
*/
void
func_set()
{
int fail = 0;
/* first stat the shared memory to get the new data */
if (shmctl(shm_id_1, IPC_STAT, &buf) == -1) {
tst_resm(TBROK, "stat failed in func_set()");
return;
}
if ((buf.shm_perm.mode & MODE_MASK) !=
((SHM_RW | NEWMODE) & MODE_MASK)) {
tst_resm(TFAIL, "new mode is incorrect");
fail = 1;
}
if (!fail && save_time >= buf.shm_ctime) {
tst_resm(TFAIL, "change time is incorrect");
fail = 1;
}
if (fail) {
return;
}
tst_resm(TPASS, "new mode and change time are correct");
}
/*
* func_rmid() - check the functionality of the IPC_RMID command with shmctl()
*/
void
func_rmid()
{
/* Do another shmctl() - we should get EINVAL */
if (shmctl(shm_id_1, IPC_STAT, &buf) != -1) {
tst_brkm(TBROK, cleanup, "shmctl succeeded on expected fail");
}
if (errno != EINVAL) {
tst_resm(TFAIL, "returned unexpected errno %d", errno);
} else {
tst_resm(TPASS, "shared memory appears to be removed");
}
shm_id_1 = -1;
}
/*
* sighandler() - handle signals, in this case SIGUSR1 is the only one expected
*/
void
sighandler(sig)
{
if (sig != SIGUSR1) {
tst_resm(TINFO, "received unexpected signal %d", sig);
}
}
/*
* setup() - performs all the ONE TIME setup for this test.
*/
void
setup(void)
{
/* capture signals */
tst_sig(FORK, 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();
}
/*
* cleanup() - performs all the ONE TIME cleanup for this test at completion
* or premature exit.
*/
void
cleanup(void)
{
/* if it exists, remove the shared memory segment */
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();
}