accept_fd_leak.c revision 134238 
1/*-
2 * Copyright (c) 2004 Robert N. M. Watson
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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/tools/regression/sockets/accept_fd_leak/accept_fd_leak.c 134238 2004-08-24 04:59:26Z rwatson $
27 */
28
29#include <sys/types.h>
30#include <sys/socket.h>
31
32#include <netinet/in.h>
33
34#include <errno.h>
35#include <fcntl.h>
36#include <stdio.h>
37#include <stdlib.h>
38#include <string.h>
39#include <unistd.h>
40
41#define	LOOPS	500
42
43/*
44 * This test is intended to detect a leak of a file descriptor in the process
45 * following a failed non-blocking accept.  It measures an available fd
46 * baseline, then performs 1000 failing accepts, then checks to see what the
47 * next fd is.  It relies on sequential fd allocation, and will test for it
48 * briefly before beginning (not 100% reliable, but a good start).
49 */
50int
51main(int argc, char *argv[])
52{
53	struct sockaddr_in sin;
54	socklen_t size;
55	int fd1, fd2, fd3, i, s;
56
57	/*
58	 * Check for sequential fd allocation, and give up early if not.
59	 */
60	fd1 = dup(STDIN_FILENO);
61	fd2 = dup(STDIN_FILENO);
62	if (fd2 != fd1 + 1) {
63		fprintf(stderr, "Non-sequential fd allocation!\n");
64		exit(-1);
65	}
66
67	s = socket(PF_INET, SOCK_STREAM, 0);
68	if (s == -1) {
69		perror("socket");
70		exit(-1);
71	}
72
73	bzero(&sin, sizeof(sin));
74	sin.sin_len = sizeof(sin);
75	sin.sin_family = AF_INET;
76	sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
77	sin.sin_port = htons(8080);
78
79	if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
80		perror("bind");
81		exit(-1);
82	}
83
84	if (listen(s, -1) != 0) {
85		perror("listen");
86		exit(-1);
87	}
88
89	i = fcntl(s, F_GETFL);
90	if (i == -1) {
91		perror("F_GETFL");
92		exit(-1);
93	}
94	i |= O_NONBLOCK;
95	if (fcntl(s, F_SETFL, i) != 0) {
96		perror("F_SETFL");
97		exit(-1);
98	}
99	i = fcntl(s, F_GETFL);
100	if (i == -1) {
101		perror("F_GETFL");
102		exit(-1);
103	}
104	if ((i & O_NONBLOCK) != O_NONBLOCK) {
105		fprintf(stderr, "Failed to set O_NONBLOCK (i=%d)\n", i);
106		exit(-1);
107	}
108
109	for (i = 0; i < LOOPS; i++) {
110		size = sizeof(sin);
111		if (accept(s, (struct sockaddr *)&sin, &size) != -1) {
112			fprintf(stderr, "accept succeeded!\n");
113			exit(-1);
114		}
115		if (errno != EAGAIN) {
116			perror("accept");
117			exit(-1);
118		}
119	}
120
121	/*
122	 * Allocate a file descriptor and make sure it's fd2+2.  2 because
123	 * we allocate an fd for the socket.
124	 */
125	fd3 = dup(STDIN_FILENO);
126	if (fd3 != fd2 + 2) {
127		fprintf(stderr, "TEST FAILED (%d, %d, %d)\n", fd1, fd2, fd3);
128		exit(-1);
129	}
130
131	return (0);
132}
133