1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2002
4 */
5
6 /*
7 * Check that if a child has a "broken pipe", this information
8 * is transmitted to the waiting parent.
9 */
10
11 #include <errno.h>
12 #include <string.h>
13 #include <unistd.h>
14 #include <stdlib.h>
15 #include <sys/wait.h>
16 #include "tst_test.h"
17
18 #define SIZE 5
19
20 static int fd[2];
21 static char rdbuf[SIZE];
22 static char wrbuf[SIZE];
23
do_child(void)24 static void do_child(void)
25 {
26 SAFE_SIGNAL(SIGPIPE, SIG_DFL);
27 SAFE_CLOSE(fd[0]);
28 SAFE_WRITE(1, fd[1], wrbuf, SIZE);
29
30 TST_CHECKPOINT_WAIT(0);
31
32 SAFE_WRITE(1, fd[1], wrbuf, SIZE);
33 exit(0);
34 }
35
verify_pipe(void)36 static void verify_pipe(void)
37 {
38 int status;
39 int sig = 0;
40 pid_t pid;
41
42 memset(wrbuf, 'a', SIZE);
43
44 #ifdef UCLINUX
45 maybe_run_child(&do_child, "dd", &fd[0], &fd[1]);
46 #endif
47
48 TEST(pipe(fd));
49 if (TST_RET == -1) {
50 tst_res(TFAIL|TTERRNO, "pipe() failed");
51 return;
52 }
53
54 pid = SAFE_FORK();
55 if (pid == 0) {
56 #ifdef UCLINUX
57 if (self_exec(av[0], "dd", fd[0], fd[1]) < 0)
58 tst_brk(TBROK, "self_exec failed");
59 #else
60 do_child();
61 #endif
62 }
63
64 memset(rdbuf, 0, SIZE);
65 SAFE_CLOSE(fd[1]);
66 SAFE_READ(1, fd[0], rdbuf, SIZE);
67
68 if (memcmp(wrbuf, rdbuf, SIZE) != 0) {
69 tst_res(TFAIL, "pipe read data and pipe "
70 "write data didn't match");
71 return;
72 }
73
74 SAFE_CLOSE(fd[0]);
75 TST_CHECKPOINT_WAKE(0);
76 SAFE_WAIT(&status);
77
78 if (!WIFSIGNALED(status)) {
79 tst_res(TFAIL, "Child wasn't killed by signal");
80 } else {
81 sig = WTERMSIG(status);
82 if (sig != SIGPIPE) {
83 tst_res(TFAIL, "Child killed by %s expected SIGPIPE",
84 tst_strsig(sig));
85 } else {
86 tst_res(TPASS, "Child killed by SIGPIPE");
87 }
88 }
89 }
90
91 static struct tst_test test = {
92 .forks_child = 1,
93 .needs_checkpoints = 1,
94 .test_all = verify_pipe,
95 };
96