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
36 static void *
deadlock_detector(void * arg)37 deadlock_detector(void *arg)
38 {
39 sleep(15);
40 PANIC("deadlock detected");
41 }
42
43 static void *
waiting_read(void * arg)44 waiting_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
59 int
main(int argc,char * argv[])60 main(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