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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
* fork06.c
*
* DESCRIPTION
* Test that a process can fork children a large number of
* times in succession
*
* ALGORITHM
* Attempt to fork a child that exits immediately
* Repeat it many times(1000), counting the number of successes and
* failures
*
* USAGE
* fork06
*
* HISTORY
* 07/2001 Ported by Wayne Boyer
*
* RESTRICTIONS
* None
*/
#include <stdio.h>
#include "test.h"
#include "usctest.h"
char *TCID = "fork06";
int TST_TOTAL = 1;
extern int Tst_count;
void setup(void);
void cleanup(void);
#define NUMFORKS 1000
main(int ac, char **av)
{
int i, pid, status, childpid, succeed, fail;
int lc; /* loop counter */
const 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);
/*NOTREACHED*/
}
/*
* perform global setup for the test
*/
setup();
/*
* check looping state if -i option is given
*/
for (lc = 0; TEST_LOOPING(lc); lc++) {
/*
* reset Tst_count in case we are looping.
*/
Tst_count = 0;
succeed = 0;
fail = 0;
for (i = 0; i < NUMFORKS; i++) {
if ((pid = fork()) == -1) {
fail++;
continue;
}
if (pid == 0) { /* child */
_exit(0);
}
/* parent */
childpid = wait(&status);
if (pid != childpid) {
tst_resm(TFAIL, "pid from wait %d", childpid);
}
succeed++;
}
tst_resm(TINFO, "tries %d", i);
tst_resm(TINFO, "successes %d", succeed);
tst_resm(TINFO, "failures %d", fail);
if ((wait(&status)) == -1) {
tst_resm(TINFO, "There were no children to wait for");
} else {
tst_resm(TINFO, "There were children left");
}
}
cleanup();
/*NOTREACHED*/
}
/*
* setup() - performs all ONE TIME setup for this test
*/
void
setup()
{
/*
* capture signals
*/
tst_sig(FORK, DEF_HANDLER, cleanup);
/*
* Pause if that option was specified
*/
TEST_PAUSE;
}
/*
* cleanup() - performs all ONE TIME cleanup for this test at
* completion or premature exit
*/
void
cleanup()
{
/*
* print timing stats if that option was specified.
* print errno log if that option was specified.
*/
TEST_CLEANUP;
tst_exit();
}
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