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