base/socket.cc

   1 /*
   2  * Copyright (c) 2002-2003 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
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31
  32 #include <netinet/in.h>
  33 #include <netinet/tcp.h>
  34
  35 #include <errno.h>
  36 #include <unistd.h>
  37
  38 #include "sim/host.hh"
  39 #include "base/misc.hh"
  40 #include "base/socket.hh"
  41
  42 using namespace std;
  43
  44 ////////////////////////////////////////////////////////////////////////
  45 //
  46 //
  47
  48 ListenSocket::ListenSocket()
  49     : listening(false), fd(-1)
  50 {}
  51
  52 ListenSocket::~ListenSocket()
  53 {
  54     if (fd != -1)
  55         close(fd);
  56 }
  57
  58 // Create a socket and configure it for listening
  59 bool
  60 ListenSocket::listen(int port, bool reuse)
  61 {
  62     if (listening)
  63         panic("Socket already listening!");
  64
  65     fd = ::socket(PF_INET, SOCK_STREAM, 0);
  66     if (fd < 0)
  67         panic("Can't create socket!");
  68
  69     if (reuse) {
  70         int i = 1;
  71         if (::setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&i,
  72                          sizeof(i)) < 0)
  73             panic("ListenSocket(listen): setsockopt() SO_REUSEADDR failed!");
  74     }
  75
  76     struct sockaddr_in sockaddr;
  77     sockaddr.sin_family = PF_INET;
  78     sockaddr.sin_addr.s_addr = INADDR_ANY;
  79
  80     sockaddr.sin_port = htons(port);
  81     int ret = ::bind(fd, (struct sockaddr *)&sockaddr, sizeof (sockaddr));
  82     if (ret != 0) {
  83         if (ret == -1 && errno != EADDRINUSE)
  84             panic("ListenSocket(listen): bind() failed!");
  85         return false;
  86     }
  87
  88     if (::listen(fd, 1) == -1)
  89         panic("ListenSocket(listen): listen() failed!");
  90
  91     listening = true;
  92
  93     return true;
  94 }
  95
  96 #if !defined(__OpenBSD__) && !defined(linux)
  97 typedef int socklen_t;
  98 #endif
  99
 100 // Open a connection.  Accept will block, so if you don't want it to,
 101 // make sure a connection is ready before you call accept.
 102 int
 103 ListenSocket::accept(bool nodelay)
 104 {
 105     struct sockaddr_in sockaddr;
 106     socklen_t slen = sizeof (sockaddr);
 107     int sfd = ::accept(fd, (struct sockaddr *)&sockaddr, &slen);
 108     if (sfd != -1 && nodelay) {
 109         int i = 1;
 110         ::setsockopt(sfd, IPPROTO_TCP, TCP_NODELAY, (char *)&i, sizeof(i));
 111     }
 112
 113     return sfd;
 114 }