minix3/tests/ipc/semget/semget05.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
* semget05.c
*
* DESCRIPTION
* semget05 - test for ENOSPC error
*
* ALGORITHM
* create semaphore sets in a loop until the system limit is reached
* loop if that option was specified
* attempt to create yet another semaphore set
* check the errno value
* issue a PASS message if we get ENOSPC
* otherwise, the tests fails
* issue a FAIL message
* call cleanup
*
* USAGE: <for command-line>
* semget05 [-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
* 07/2006 - Changes By Michael Reed
* - Changed the value of MAXIDS for the specific machine by reading
* the system limit for SEMMNI - The maximum number of sempahore sets
*
* RESTRICTIONS
* none
*/
#include "../lib/ipcsem.h"
char *TCID = "semget05";
int TST_TOTAL = 1;
extern int Tst_count;
/*
* The MAXIDS value is somewhat arbitrary and may need to be increased
* depending on the system being tested.
*/
int MAXIDS=2048;
int exp_enos[] = {ENOSPC, 0}; /* 0 terminated list of expected errnos */
int *sem_id_arr;
int num_sems = 0; /* count the semaphores created */
int main(int ac, char **av)
{
int lc,getmaxid=0; /* loop counter */
char *msg; /* message returned from parse_opts */
FILE *fp;
/* parse standard options */
if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
}
/* Set the MAXIDS for the specific machine by reading the system limit
for SEMMNI - The maximum number of sempahore sets */
if((fp = fopen("/proc/sys/kernel/sem", "r")) != NULL)
{
for(lc= 0; lc < 4; lc++)
{
if(lc == 3)
{
if(getmaxid > MAXIDS)
MAXIDS=getmaxid;
}
}
}
if(fp)
fclose(fp);
sem_id_arr = (int*)malloc(sizeof(int)*MAXIDS);
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 the TEST macro to make the call */
TEST(semget(semkey + num_sems, PSEMS,
IPC_CREAT | IPC_EXCL | SEM_RA));
/* printf("rc = %ld \n", TEST_RETURN); */
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, "unexpected error - %d : %s",
TEST_ERRNO, strerror(TEST_ERRNO));
break;
}
}
cleanup();
/*NOTREACHED*/
return(0);
}
/*
* setup() - performs all the ONE TIME setup for this test.
*/
void
setup(void)
{
int sem_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();
/* get an IPC resource key */
semkey = getipckey();
/*
* Use a while loop to create the maximum number of semaphore sets.
* If the loop exceeds MAXIDS, then break the test and cleanup.
*/
while((sem_q =
semget(semkey + num_sems, PSEMS, IPC_CREAT|IPC_EXCL)) != -1) {
sem_id_arr[num_sems++] = sem_q;
if (num_sems == MAXIDS) {
tst_brkm(TBROK, cleanup, "The maximum number of "
"semaphore ID's has been\n\t reached. Please "
"increase the MAXIDS value in the test.");
}
}
/*
* If the errno is 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 semaphore resources that were created */
for (i=0; i<num_sems; i++) {
rm_sema(sem_id_arr[i]);
}
/* 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();
}