1/*	$OpenBSD: blocked_dup2.c,v 1.4 2012/02/20 17:06:11 kurt Exp $	*/
2/*
3 * Copyright (c) 2006 Kurt Miller <kurt@intricatesoftware.com>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18/*
19 * Test dup2() racing with other threads using the same file
20 * descriptor, with some of them blocking on data that will never
21 * arrive.
22 */
23
24#include <pthread.h>
25#include <unistd.h>
26#include <fcntl.h>
27#include <time.h>
28#include <sys/types.h>
29#include <sys/socket.h>
30#include <netinet/in.h>
31#include "test.h"
32
33#define ITERATIONS	100
34#define WAITING_THREADS	5
35
36static void *
37deadlock_detector(void *arg)
38{
39	sleep(15);
40	PANIC("deadlock detected");
41}
42
43static void *
44waiting_read(void *arg)
45{
46	int fd = *(int *)arg;
47	struct sockaddr remote_addr;
48	char readBuf;
49	int n, remote_addr_len = sizeof(struct sockaddr);
50
51	n = recvfrom(fd, &readBuf, 1, 0, &remote_addr, &remote_addr_len);
52
53	if (n == -1)
54		return ((caddr_t)NULL + errno);
55	else
56		return (NULL);
57}
58
59int
60main(int argc, char *argv[])
61{
62	pthread_t waiting_threads[WAITING_THREADS];
63	pthread_t deadlock_thread;
64	struct sockaddr_in addr;
65	int fd, newfd, i, j;
66	void *value_ptr;
67	struct timespec rqtp;
68
69	rqtp.tv_sec = 0;
70	rqtp.tv_nsec = 1000000;
71
72	bzero((char *) &addr, sizeof addr);
73	addr.sin_family = AF_INET;
74	addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
75	addr.sin_port = htons(0);
76
77	CHECKr(pthread_create(&deadlock_thread, NULL,
78	    deadlock_detector, NULL));
79
80	CHECKe(fd = socket(AF_INET, SOCK_DGRAM, 0));
81 	CHECKr(bind(fd, (struct sockaddr *)&addr, sizeof(addr)));
82
83	CHECKe(newfd = socket(AF_INET, SOCK_DGRAM, 0));
84 	CHECKr(bind(newfd, (struct sockaddr *)&addr, sizeof(addr)));
85
86	for (i = 0; i < ITERATIONS; i++) {
87		for (j = 0; j < WAITING_THREADS; j++)
88			CHECKr(pthread_create(&waiting_threads[j], NULL,
89			    waiting_read, (void *)&newfd));
90		nanosleep(&rqtp, NULL);
91		CHECKe(dup2(fd, newfd));
92		for (j = 0; j < WAITING_THREADS; j++) {
93			CHECKr(pthread_join(waiting_threads[j], &value_ptr));
94			ASSERT(value_ptr == (void *)EBADF);
95		}
96	}
97	SUCCEED;
98}
99