minix/test/ipc/msgget/msgget03.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
* msgget03.c
*
* DESCRIPTION
* msgget03 - test for an ENOSPC error by using up all available
* message queues.
*
* ALGORITHM
* Get all the message queues that can be allocated
* loop if that option was specified
* Try to get one more message queue
* check the errno value
* issue a PASS message if we get ENOSPC
* otherwise, the tests fails
* issue a FAIL message
* break any remaining tests
* call cleanup
*
* USAGE: <for command-line>
* msgget03 [-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
* none
*/
#include "test.h"
#include "usctest.h"
#include "ipcmsg.h"
char *TCID = "msgget03";
int TST_TOTAL = 1;
extern int Tst_count;
int maxmsgs = 0;
int exp_enos[] = {ENOSPC, 0}; /* 0 terminated list of expected errnos */
int *msg_q_arr = NULL; /* hold the id's that we create */
int num_queue = 0; /* count the queues created */
static int get_max_msgqueues();
int main(int ac, char **av)
{
int lc; /* loop counter */
char *msg; /* message returned from parse_opts */
/* 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;
/*
* Try to create another message queue. This should
* give us an ENOSPC error.
*/
TEST(msgget(msgkey + num_queue + 1, IPC_CREAT|IPC_EXCL));
if (TEST_RETURN != -1) {
tst_resm(TFAIL, "call succeeded when error expected");
continue;
}
TEST_ERROR_LOG(TEST_ERRNO);
switch(TEST_ERRNO) {
case ENOSPC:
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;
}
}
cleanup();
/*NOTREACHED*/
return(0);
}
/** Get the max number of message queues allowed on system */
int get_max_msgqueues()
{
FILE *f;
char buff[512];
/* Get the max number of message queues allowed on system */
f = fopen("/proc/sys/kernel/msgmni", "r");
if (!f){
tst_brkm(TBROK, cleanup, "Could not open /proc/sys/kernel/msgmni");
}
if (!fgets(buff, 512, f)) {
tst_brkm(TBROK, cleanup, "Could not read /proc/sys/kernel/msgmni");
}
fclose(f);
return atoi(buff);
}
/*
* setup() - performs all the ONE TIME setup for this test.
*/
void
setup(void)
{
int msg_q;
/* capture signals */
tst_sig(NOFORK, 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();
msgkey = getipckey();
maxmsgs = get_max_msgqueues();
msg_q_arr = (int *)calloc(maxmsgs, sizeof (int));
if (msg_q_arr == NULL) {
tst_brkm(TBROK, cleanup, "Couldn't allocate memory "
"for msg_q_arr: calloc() failed");
}
/*
* Use a while loop to create the maximum number of queues.
* When we get an error, check for ENOSPC.
*/
while((msg_q = msgget(msgkey + num_queue, IPC_CREAT|IPC_EXCL)) != -1) {
msg_q_arr[num_queue] = msg_q;
if (num_queue == maxmsgs) {
tst_resm(TINFO, "The maximum number of message"
" queues (%d) has been reached", maxmsgs);
break;
}
num_queue++;
}
/*
* if we have something other than ENOSPC, then something else is
* wrong.
*/
if (errno != ENOSPC) {
tst_brkm(TBROK, cleanup, "Didn't get ENOSPC in test setup"
" - errno = %d : %s", errno, strerror(errno));
}
}
/*
* cleanup() - performs all the ONE TIME cleanup for this test at completion
* or premature exit.
*/
void
cleanup(void)
{
int i;
/*
* remove the message queues if they were created
*/
if (msg_q_arr != NULL) {
for (i=0; i<num_queue; i++) {
rm_queue(msg_q_arr[i]);
}
(void) free(msg_q_arr);
}
/* 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();
}