socket.cc revision 10412
1/* 2 * Copyright (c) 2002-2005 The Regents of The University of Michigan 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 are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Nathan Binkert 29 */ 30 31#include <netinet/in.h> 32#include <netinet/tcp.h> 33#include <sys/socket.h> 34#include <sys/types.h> 35#include <unistd.h> 36 37#include <cerrno> 38 39#include "base/misc.hh" 40#include "base/socket.hh" 41#include "base/types.hh" 42 43using namespace std; 44 45bool ListenSocket::listeningDisabled = false; 46bool ListenSocket::anyListening = false; 47 48void 49ListenSocket::disableAll() 50{ 51 if (anyListening) 52 panic("Too late to disable all listeners, already have a listener"); 53 listeningDisabled = true; 54} 55 56bool 57ListenSocket::allDisabled() 58{ 59 return listeningDisabled; 60} 61 62//////////////////////////////////////////////////////////////////////// 63// 64// 65 66ListenSocket::ListenSocket() 67 : listening(false), fd(-1) 68{} 69 70ListenSocket::~ListenSocket() 71{ 72 if (fd != -1) 73 close(fd); 74} 75 76// Create a socket and configure it for listening 77bool 78ListenSocket::listen(int port, bool reuse) 79{ 80 if (listening) 81 panic("Socket already listening!"); 82 83 fd = ::socket(PF_INET, SOCK_STREAM, 0); 84 if (fd < 0) 85 panic("Can't create socket:%s !", strerror(errno)); 86 87 if (reuse) { 88 int i = 1; 89 if (::setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&i, 90 sizeof(i)) < 0) 91 panic("ListenSocket(listen): setsockopt() SO_REUSEADDR failed!"); 92 } 93 94 struct sockaddr_in sockaddr; 95 sockaddr.sin_family = PF_INET; 96 sockaddr.sin_addr.s_addr = INADDR_ANY; 97 sockaddr.sin_port = htons(port); 98 // finally clear sin_zero 99 memset(&sockaddr.sin_zero, 0, sizeof(sockaddr.sin_zero)); 100 int ret = ::bind(fd, (struct sockaddr *)&sockaddr, sizeof (sockaddr)); 101 if (ret != 0) { 102 if (ret == -1 && errno != EADDRINUSE) 103 panic("ListenSocket(listen): bind() failed!"); 104 return false; 105 } 106 107 if (::listen(fd, 1) == -1) { 108 if (errno != EADDRINUSE) 109 panic("ListenSocket(listen): listen() failed!"); 110 111 return false; 112 } 113 114 listening = true; 115 anyListening = true; 116 return true; 117} 118 119 120// Open a connection. Accept will block, so if you don't want it to, 121// make sure a connection is ready before you call accept. 122int 123ListenSocket::accept(bool nodelay) 124{ 125 struct sockaddr_in sockaddr; 126 socklen_t slen = sizeof (sockaddr); 127 int sfd = ::accept(fd, (struct sockaddr *)&sockaddr, &slen); 128 if (sfd != -1 && nodelay) { 129 int i = 1; 130 if (::setsockopt(sfd, IPPROTO_TCP, TCP_NODELAY, (char *)&i, 131 sizeof(i)) < 0) 132 warn("ListenSocket(accept): setsockopt() TCP_NODELAY failed!"); 133 } 134 135 return sfd; 136} 137