socket.cc revision 11793
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 "base/socket.hh" 32 33#include <netinet/in.h> 34#include <netinet/tcp.h> 35#include <sys/socket.h> 36#include <sys/types.h> 37#include <unistd.h> 38 39#include <cerrno> 40 41#include "base/misc.hh" 42#include "base/types.hh" 43 44using namespace std; 45 46bool ListenSocket::listeningDisabled = false; 47bool ListenSocket::anyListening = false; 48 49void 50ListenSocket::disableAll() 51{ 52 if (anyListening) 53 panic("Too late to disable all listeners, already have a listener"); 54 listeningDisabled = true; 55} 56 57bool 58ListenSocket::allDisabled() 59{ 60 return listeningDisabled; 61} 62 63//////////////////////////////////////////////////////////////////////// 64// 65// 66 67ListenSocket::ListenSocket() 68 : listening(false), fd(-1) 69{} 70 71ListenSocket::~ListenSocket() 72{ 73 if (fd != -1) 74 close(fd); 75} 76 77// Create a socket and configure it for listening 78bool 79ListenSocket::listen(int port, bool reuse) 80{ 81 if (listening) 82 panic("Socket already listening!"); 83 84 fd = ::socket(PF_INET, SOCK_STREAM, 0); 85 if (fd < 0) 86 panic("Can't create socket:%s !", strerror(errno)); 87 88 if (reuse) { 89 int i = 1; 90 if (::setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&i, 91 sizeof(i)) < 0) 92 panic("ListenSocket(listen): setsockopt() SO_REUSEADDR failed!"); 93 } 94 95 struct sockaddr_in sockaddr; 96 sockaddr.sin_family = PF_INET; 97 sockaddr.sin_addr.s_addr = INADDR_ANY; 98 sockaddr.sin_port = htons(port); 99 // finally clear sin_zero 100 memset(&sockaddr.sin_zero, 0, sizeof(sockaddr.sin_zero)); 101 int ret = ::bind(fd, (struct sockaddr *)&sockaddr, sizeof (sockaddr)); 102 if (ret != 0) { 103 if (ret == -1 && errno != EADDRINUSE) 104 panic("ListenSocket(listen): bind() failed!"); 105 return false; 106 } 107 108 if (::listen(fd, 1) == -1) { 109 if (errno != EADDRINUSE) 110 panic("ListenSocket(listen): listen() failed!"); 111 112 return false; 113 } 114 115 listening = true; 116 anyListening = true; 117 return true; 118} 119 120 121// Open a connection. Accept will block, so if you don't want it to, 122// make sure a connection is ready before you call accept. 123int 124ListenSocket::accept(bool nodelay) 125{ 126 struct sockaddr_in sockaddr; 127 socklen_t slen = sizeof (sockaddr); 128 int sfd = ::accept(fd, (struct sockaddr *)&sockaddr, &slen); 129 if (sfd != -1 && nodelay) { 130 int i = 1; 131 if (::setsockopt(sfd, IPPROTO_TCP, TCP_NODELAY, (char *)&i, 132 sizeof(i)) < 0) 133 warn("ListenSocket(accept): setsockopt() TCP_NODELAY failed!"); 134 } 135 136 return sfd; 137} 138