newlib-cygwin/winsup/testsuite/winsup.api/ltp/fork10.c

217 lines
4.4 KiB
C

/*
*
* 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
* fork04.c
*
* DESCRIPTION
* Check inheritance of file descriptor by children, they
* should all be refering to the same file.
*
* ALGORITHM
* Child reads several chars and exits.
* Parent forks another child, have the child and parent attempt to use
* that location
*
* USAGE
* fork04
*
* HISTORY
* 07/2001 Ported by Wayne Boyer
*
* RESTRICTIONS
* None
*/
#include <errno.h>
#include <fcntl.h>
#include <sys/wait.h>
#include "test.h"
#include "usctest.h"
const char *TCID = "fork04";
int TST_TOTAL = 1;
extern int Tst_count;
void setup(void);
void cleanup(void) __attribute__((noreturn));
char pidbuf[10];
char fnamebuf[40];
int
main(int ac, char **av)
{
int status, pid, fildes;
char parchar[2];
char chilchar[2];
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 ((fildes = creat(fnamebuf, 0600)) < 0) {
tst_brkm(TBROK, cleanup, "Parent: cannot open %s for "
"write, errno = %d", fnamebuf, errno);
/*NOTREACHED*/
}
write(fildes, "ABCDEFGHIJKLMNOPQRSTUVWXYZ\n", 27);
close(fildes);
if ((fildes = open(fnamebuf, 0)) == -1) {
tst_brkm(TBROK, cleanup, "Parent: cannot open %s for "
"reading", fnamebuf);
/*NOTREACHED*/
}
if ((pid = fork()) == -1) {
tst_brkm(TBROK, cleanup, "fork() #1 failed");
/*NOTREACHED*/
}
if (pid == 0) { /* child */
tst_resm(TINFO, "fork child A");
if (lseek(fildes, 10L, 0) == -1L) {
tst_resm(TFAIL, "bad lseek by child");
exit(1);
}
exit(0);
} else { /* parent */
wait(&status);
/* parent starts second child */
if ((pid = fork()) == -1) {
tst_brkm(TBROK, cleanup, "fork() #2 failed");
/*NOTREACHED*/
}
if (pid == 0) { /* child */
if (read(fildes, chilchar, 1) <= 0) {
tst_resm(TFAIL, "Child can't read "
"file");
exit(1);
} else {
if (chilchar[0] != 'K') {
chilchar[1] = '\n';
exit(1);
} else {
exit(0);
}
}
} else { /* parent */
(void)wait(&status);
if (status >> 8 != 0) {
tst_resm(TFAIL, "Bad return from "
"second child");
continue;
}
/* parent reads */
if (read(fildes, parchar, 1) <= 0) {
tst_resm(TFAIL, "Parent cannot read "
"file");
continue;
} else {
write(fildes, parchar, 1);
if (parchar[0] != 'L') {
parchar[1] = '\n';
tst_resm(TFAIL, "Test failed");
continue;
}
}
}
}
tst_resm(TPASS, "test 1 PASSED");
close (fildes);
}
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, "fork04.");
sprintf(pidbuf, "%d", getpid());
strcat(fnamebuf, pidbuf);
}
/*
* 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
*/
tst_rmdir();
tst_exit();
}