160 lines
3.3 KiB
C
160 lines
3.3 KiB
C
/*
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*
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* NAME
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* fork10.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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* fork10
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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 <sys/types.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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#include "test.h"
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#include "safe_macros.h"
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char *TCID = "fork10";
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int TST_TOTAL = 1;
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static void setup(void);
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static void cleanup(void);
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static char pidbuf[10];
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static char fnamebuf[40];
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int 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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int lc;
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fildes = -1;
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tst_parse_opts(ac, av, NULL, NULL);
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setup();
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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tst_count = 0;
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fildes = SAFE_CREAT(cleanup, fnamebuf, 0600);
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write(fildes, "ABCDEFGHIJKLMNOPQRSTUVWXYZ\n", 27);
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close(fildes);
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fildes = SAFE_OPEN(cleanup, fnamebuf, 0);
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pid = fork();
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if (pid == -1)
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tst_brkm(TBROK, cleanup, "fork() #1 failed");
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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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pid = fork();
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if (pid == -1)
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tst_brkm(TBROK, cleanup, "fork() #2 failed");
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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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}
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close(fildes);
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cleanup();
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tst_exit();
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}
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static void setup(void)
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{
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tst_sig(FORK, DEF_HANDLER, cleanup);
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umask(0);
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TEST_PAUSE;
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tst_tmpdir();
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strcpy(fnamebuf, "fork10.");
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sprintf(pidbuf, "%d", getpid());
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strcat(fnamebuf, pidbuf);
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}
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static void cleanup(void)
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{
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tst_rmdir();
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}
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