accept_fd_leak.c revision 136843 
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 136843 2004-10-23 22:11:35Z rwatson $
27 */
28
29#include <sys/types.h>
30#include <sys/socket.h>
31
32#include <netinet/in.h>
33
34#include <err.h>
35#include <errno.h>
36#include <fcntl.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <unistd.h>
41
42#define	LOOPS	500
43
44/*
45 * This test is intended to detect a leak of a file descriptor in the process
46 * following a failed non-blocking accept.  It measures an available fd
47 * baseline, then performs 1000 failing accepts, then checks to see what the
48 * next fd is.  It relies on sequential fd allocation, and will test for it
49 * briefly before beginning (not 100% reliable, but a good start).
50 */
51int
52main(int argc, char *argv[])
53{
54	struct sockaddr_in sin;
55	socklen_t size;
56	int fd1, fd2, fd3, i, s;
57
58	/*
59	 * Check for sequential fd allocation, and give up early if not.
60	 */
61	fd1 = dup(STDIN_FILENO);
62	fd2 = dup(STDIN_FILENO);
63	if (fd2 != fd1 + 1)
64		errx(-1, "Non-sequential fd allocation\n");
65
66	s = socket(PF_INET, SOCK_STREAM, 0);
67	if (s == -1)
68		errx(-1, "socket: %s", strerror(errno));
69
70	bzero(&sin, sizeof(sin));
71	sin.sin_len = sizeof(sin);
72	sin.sin_family = AF_INET;
73	sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
74	sin.sin_port = htons(8080);
75
76	if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) != 0)
77		errx(-1, "bind: %s", strerror(errno));
78
79	if (listen(s, -1) != 0)
80		errx(-1, "listen: %s", strerror(errno));
81
82	i = fcntl(s, F_GETFL);
83	if (i == -1)
84		errx(-1, "ioctl(F_GETFL): %s", strerror(errno));
85	i |= O_NONBLOCK;
86	if (fcntl(s, F_SETFL, i) != 0)
87		errx(-1, "ioctl(F_SETFL): %s", strerror(errno));
88	i = fcntl(s, F_GETFL);
89	if (i == -1)
90		errx(-1, "ioctl(F_GETFL): %s", strerror(errno));
91	if ((i & O_NONBLOCK) != O_NONBLOCK)
92		errx(-1, "Failed to set O_NONBLOCK (i=0x%x)\n", i);
93
94	for (i = 0; i < LOOPS; i++) {
95		size = sizeof(sin);
96		if (accept(s, (struct sockaddr *)&sin, &size) != -1)
97			errx(-1, "accept succeeded\n");
98		if (errno != EAGAIN)
99			errx(-1, "accept: %s", strerror(errno));
100	}
101
102	/*
103	 * Allocate a file descriptor and make sure it's fd2+2.  2 because
104	 * we allocate an fd for the socket.
105	 */
106	fd3 = dup(STDIN_FILENO);
107	if (fd3 != fd2 + 2)
108		errx(-1, "FAIL (%d, %d, %d)\n", fd1, fd2, fd3);
109	else
110		fprintf(stderr, "PASS\n");
111
112	return (0);
113}
114