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96 lines
1.7 KiB
96 lines
1.7 KiB
7 months ago
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) International Business Machines Corp., 2002
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*/
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/*
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* Check that if a child has a "broken pipe", this information
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* is transmitted to the waiting parent.
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*/
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include "tst_test.h"
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#define SIZE 5
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static int fd[2];
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static char rdbuf[SIZE];
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static char wrbuf[SIZE];
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static void do_child(void)
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{
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SAFE_SIGNAL(SIGPIPE, SIG_DFL);
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SAFE_CLOSE(fd[0]);
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SAFE_WRITE(1, fd[1], wrbuf, SIZE);
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TST_CHECKPOINT_WAIT(0);
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SAFE_WRITE(1, fd[1], wrbuf, SIZE);
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exit(0);
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}
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static void verify_pipe(void)
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{
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int status;
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int sig = 0;
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pid_t pid;
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memset(wrbuf, 'a', SIZE);
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#ifdef UCLINUX
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maybe_run_child(&do_child, "dd", &fd[0], &fd[1]);
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#endif
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TEST(pipe(fd));
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if (TST_RET == -1) {
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tst_res(TFAIL|TERRNO, "pipe() failed");
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return;
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}
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pid = SAFE_FORK();
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if (pid == 0) {
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#ifdef UCLINUX
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if (self_exec(av[0], "dd", fd[0], fd[1]) < 0)
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tst_brk(TBROK, "self_exec failed");
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#else
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do_child();
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#endif
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}
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memset(rdbuf, 0, SIZE);
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SAFE_CLOSE(fd[1]);
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SAFE_READ(1, fd[0], rdbuf, SIZE);
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if (memcmp(wrbuf, rdbuf, SIZE) != 0) {
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tst_res(TFAIL, "pipe read data and pipe "
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"write data didn't match");
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return;
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}
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SAFE_CLOSE(fd[0]);
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TST_CHECKPOINT_WAKE(0);
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SAFE_WAIT(&status);
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if (!WIFSIGNALED(status)) {
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tst_res(TFAIL, "Child wasn't killed by signal");
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} else {
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sig = WTERMSIG(status);
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if (sig != SIGPIPE) {
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tst_res(TFAIL, "Child killed by %s expected SIGPIPE",
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tst_strsig(sig));
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} else {
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tst_res(TPASS, "Child killed by SIGPIPE");
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}
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}
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}
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static struct tst_test test = {
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.forks_child = 1,
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.needs_checkpoints = 1,
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.test_all = verify_pipe,
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};
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