218 lines
4.4 KiB
C
218 lines
4.4 KiB
C
/*
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*
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* Copyright (c) International Business Machines Corp., 2001
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* NAME
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* fork04.c
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*
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* DESCRIPTION
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* Check inheritance of file descriptor by children, they
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* should all be refering to the same file.
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*
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* ALGORITHM
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* Child reads several chars and exits.
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* Parent forks another child, have the child and parent attempt to use
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* that location
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*
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* USAGE
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* fork04
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*
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* HISTORY
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* 07/2001 Ported by Wayne Boyer
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*
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* RESTRICTIONS
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* None
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/wait.h>
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#include "test.h"
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#include "usctest.h"
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const char *TCID = "fork04";
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int TST_TOTAL = 1;
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extern int Tst_count;
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void setup(void);
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void cleanup(void) __attribute__((noreturn));
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char pidbuf[10];
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char fnamebuf[40];
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int
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main(int ac, char **av)
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{
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int status, pid, fildes;
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char parchar[2];
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char chilchar[2];
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long lseek();
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int lc; /* loop counter */
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const char *msg; /* message returned from parse_opts */
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/*
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* parse standard options
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*/
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if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
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tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
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/*NOTREACHED*/
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}
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/*
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* perform global setup for the test
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*/
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setup();
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/*
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* check looping state if -i option is given
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*/
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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/*
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* reset Tst_count in case we are looping.
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*/
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Tst_count = 0;
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if ((fildes = creat(fnamebuf, 0600)) < 0) {
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tst_brkm(TBROK, cleanup, "Parent: cannot open %s for "
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"write, errno = %d", fnamebuf, errno);
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/*NOTREACHED*/
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}
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write(fildes, "ABCDEFGHIJKLMNOPQRSTUVWXYZ\n", 27);
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close(fildes);
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if ((fildes = open(fnamebuf, 0)) == -1) {
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tst_brkm(TBROK, cleanup, "Parent: cannot open %s for "
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"reading", fnamebuf);
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/*NOTREACHED*/
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}
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if ((pid = fork()) == -1) {
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tst_brkm(TBROK, cleanup, "fork() #1 failed");
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/*NOTREACHED*/
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}
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if (pid == 0) { /* child */
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tst_resm(TINFO, "fork child A");
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if (lseek(fildes, 10L, 0) == -1L) {
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tst_resm(TFAIL, "bad lseek by child");
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exit(1);
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}
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exit(0);
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} else { /* parent */
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wait(&status);
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/* parent starts second child */
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if ((pid = fork()) == -1) {
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tst_brkm(TBROK, cleanup, "fork() #2 failed");
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/*NOTREACHED*/
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}
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if (pid == 0) { /* child */
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if (read(fildes, chilchar, 1) <= 0) {
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tst_resm(TFAIL, "Child can't read "
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"file");
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exit(1);
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} else {
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if (chilchar[0] != 'K') {
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chilchar[1] = '\n';
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exit(1);
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} else {
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exit(0);
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}
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}
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} else { /* parent */
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(void)wait(&status);
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if (status >> 8 != 0) {
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tst_resm(TFAIL, "Bad return from "
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"second child");
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continue;
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}
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/* parent reads */
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if (read(fildes, parchar, 1) <= 0) {
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tst_resm(TFAIL, "Parent cannot read "
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"file");
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continue;
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} else {
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write(fildes, parchar, 1);
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if (parchar[0] != 'L') {
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parchar[1] = '\n';
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tst_resm(TFAIL, "Test failed");
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continue;
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}
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}
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}
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}
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tst_resm(TPASS, "test 1 PASSED");
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close (fildes);
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}
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cleanup();
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/*NOTREACHED*/
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}
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/*
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* setup() - performs all ONE TIME setup for this test
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*/
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void
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setup()
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{
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/*
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* capture signals
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*/
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tst_sig(FORK, DEF_HANDLER, cleanup);
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umask(0);
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/*
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* Pause if that option was specified
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*/
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TEST_PAUSE;
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/*
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* make a temp directory and cd to it
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*/
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tst_tmpdir();
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strcpy(fnamebuf, "fork04.");
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sprintf(pidbuf, "%d", getpid());
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strcat(fnamebuf, pidbuf);
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}
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/*
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* cleanup() - performs all ONE TIME cleanup for this test at
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* completion or premature exit
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*/
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void
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cleanup()
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{
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/*
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* print timing stats if that option was specified.
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* print errno log if that option was specified.
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*/
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TEST_CLEANUP;
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/*
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* remove tmp dir and all files in it
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*/
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tst_rmdir();
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tst_exit();
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}
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