1 #include <stdio.h>
2 #include <stdlib.h>
3
4 #include <sys/types.h>
5 #include <sys/uio.h>
6 #include <unistd.h>
7
8 #include <darwintest.h>
9
10 static void
too_long(int ignored)11 too_long(int ignored)
12 {
13 T_ASSERT_FAIL("child readv is blocked");
14 }
15
16 T_DECL(pipe_read_infloop_55437634, "Infinite loop in pipe_read")
17 {
18 int p[2];
19 char c = 0;
20 struct iovec iov = {
21 .iov_base = &c,
22 .iov_len = 0x100000000UL
23 };
24 pid_t child;
25 int status = 0;
26
27 T_SETUPBEGIN;
28 /* create a pipe with some data in it: */
29 T_ASSERT_POSIX_SUCCESS(pipe(p), NULL);
30 T_ASSERT_POSIX_SUCCESS(write(p[1], "A", 1), NULL);
31 T_SETUPEND;
32
33 T_ASSERT_POSIX_SUCCESS(child = fork(), NULL);
34
35 if (!child) {
36 readv(p[0], &iov, 1);
37 exit(0);
38 }
39
40 /*
41 * if the waitpid takes too long, the child is probably stuck in the
42 * infinite loop, so fail via too_long.
43 */
44 T_ASSERT_NE(signal(SIGALRM, too_long), SIG_ERR, NULL);
45 T_ASSERT_POSIX_SUCCESS(alarm(10), NULL);
46
47 /* this will hang if the bug is there: */
48 T_ASSERT_POSIX_SUCCESS(waitpid(child, &status, 0), NULL);
49
50 /* expecting a clean, zero exit: */
51 T_ASSERT_TRUE(WIFEXITED(status), NULL);
52 T_ASSERT_EQ(WEXITSTATUS(status), 0, NULL);
53 }
54