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 * $FreeBSD$ 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 */ 50 int 51 main(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 if (accept(s, (struct sockaddr *)&sin, &size) != -1) { 111 fprintf(stderr, "accept succeeded!\n"); 112 exit(-1); 113 } 114 if (errno != EAGAIN) { 115 perror("accept"); 116 exit(-1); 117 } 118 } 119 120 /* 121 * Allocate a file descriptor and make sure it's fd2+2. 2 because 122 * we allocate an fd for the socket. 123 */ 124 fd3 = dup(STDIN_FILENO); 125 if (fd3 != fd2 + 2) { 126 fprintf(stderr, "TEST FAILED (%d, %d, %d)\n", fd1, fd2, fd3); 127 exit(-1); 128 } 129 130 return (0); 131 } 132