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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
* fork07.c
*
* DESCRIPTION
* Check that all children inherit parent's file descriptor
*
* ALGORITHM
* Parent opens a file, writes to it; forks processes until
* -1 is returned. Each child attempts to read the file then returns.
*
* USAGE
* fork07
*
* HISTORY
* 07/2001 Ported by Wayne Boyer
*
* RESTRICTIONS
* None
*/
#include <sys/wait.h>
#include <sys/stat.h>
#include "test.h"
#include "usctest.h"
const char *TCID = "fork07";
int TST_TOTAL = 1;
extern int Tst_count;
void setup(void);
void cleanup(void) __attribute__((noreturn));
char pbuf[10];
char fnamebuf[40];
int
main(int ac, char **av)
{
int status, count, forks, pid1;
int ch_r_stat;
FILE *rea = NULL, *writ = NULL;
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;
if ((writ = fopen(fnamebuf, "w")) == NULL)
tst_resm(TFAIL, "failed to fopen file for write");
if ((rea = fopen(fnamebuf, "r")) == NULL)
tst_resm(TFAIL, "failed to fopen file for read");
fprintf(writ,"abcdefghijklmnopqrstuv") ;
fflush(writ);
sleep(1);
if ((getc(rea)) != 'a')
tst_resm(TFAIL, "getc from read side was confused");
forks = 0;
forkone:
++forks;
pid1 = -1;
if ( forks >= 1000 || (pid1 = fork()) != 0) { /* parent */
if (pid1 > 0) {
goto forkone;
} else if (pid1 < 0) {
tst_resm(TINFO, "last child forked");
}
} else { /* child */
ch_r_stat = getc(rea);
#ifdef DEBUG
tst_resm(TINFO, "Child got char: %c", ch_r_stat);
tst_resm(TINFO, "integer value of getc in child "
"expected %d got %d", 'b', ch_r_stat);
#endif
if (ch_r_stat != EOF) { /* for error or EOF */
tst_resm(TPASS, "test passed in child no %d",
forks);
exit(0);
} else {
tst_resm(TFAIL, "Test failed in child no. %d",
forks);
exit(-1);
}
}
/* parent */
--forks;
for (count = 0; count <= forks; count++) {
wait(&status);
#ifdef DEBUG
tst_resm(TINFO, " exit status of wait "
" expected 0 got %d", status);
#endif
if (status == 0) {
tst_resm(TPASS, "parent test passed");
} else {
tst_resm(TFAIL, "parent test failed");
}
}
tst_resm(TINFO, "Number of processes forked is %d", forks);
}
fclose (writ);
fclose (rea);
cleanup();
/*NOTREACHED*/
}
/*
* setup() - performs all ONE TIME setup for this test
*/
void
setup()
{
/*
* capture signals
*/
tst_sig(FORK, DEF_HANDLER, cleanup);
umask(0);
/*
* Pause if that option was specified
*/
TEST_PAUSE;
/*
* make a temp directory and cd to it
*/
tst_tmpdir();
strcpy(fnamebuf, "fork07.");
sprintf(pbuf, "%d", getpid());
strcat(fnamebuf, pbuf);
}
/*
* 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;
/*
* remove tmp dir and all files in it
*/
unlink(fnamebuf);
tst_rmdir();
tst_exit();
}
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