1 /*
2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <assert.h>
29 #include <stdlib.h>
30 #include <unistd.h>
31 #include <pthread.h>
32 #include <sys/wait.h>
33
34 #define P 16
35 #define T 7
36
37 static void *
thread(void * arg)38 thread(void *arg)
39 {
40 assert(write(1, "", 1) == 1);
41 pause();
42 return arg;
43 }
44
45 static int
process(void)46 process(void)
47 {
48 int i;
49 int fds[2];
50 pthread_t t;
51 struct timespec ts = { .tv_nsec = 10000000 };
52
53 (void) close(0);
54 (void) close(1);
55 assert(pipe(fds) == 0 && fds[0] == 0 && fds[1] == 1);
56
57 for (i = 0; i < T; ++i)
58 assert(pthread_create(&t, NULL, thread, NULL) == 0);
59 for (i = 0; i < T; ++i)
60 assert(read(0, fds, 1) == 1);
61
62 (void) nanosleep(&ts, 0);
63 return 0;
64 }
65
66 int
main(void)67 main(void)
68 {
69 int i, s;
70 pid_t p;
71
72 for (i = 0; i < P; ++i) {
73 assert((p = fork()) >= 0);
74 if (p == 0)
75 return process();
76 assert(waitpid(p, &s, 0) == p && WIFEXITED(s));
77 if (WEXITSTATUS(s))
78 return WEXITSTATUS(s);
79 }
80 return 0;
81 }
82