socket.cc revision 8229:78bf55f23338 
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
98    sockaddr.sin_port = htons(port);
99    int ret = ::bind(fd, (struct sockaddr *)&sockaddr, sizeof (sockaddr));
100    if (ret != 0) {
101        if (ret == -1 && errno != EADDRINUSE)
102            panic("ListenSocket(listen): bind() failed!");
103        return false;
104    }
105
106    if (::listen(fd, 1) == -1)
107        panic("ListenSocket(listen): listen() failed!");
108
109    listening = true;
110
111    anyListening = true;
112    return true;
113}
114
115
116// Open a connection.  Accept will block, so if you don't want it to,
117// make sure a connection is ready before you call accept.
118int
119ListenSocket::accept(bool nodelay)
120{
121    struct sockaddr_in sockaddr;
122    socklen_t slen = sizeof (sockaddr);
123    int sfd = ::accept(fd, (struct sockaddr *)&sockaddr, &slen);
124    if (sfd != -1 && nodelay) {
125        int i = 1;
126        ::setsockopt(sfd, IPPROTO_TCP, TCP_NODELAY, (char *)&i, sizeof(i));
127    }
128
129    return sfd;
130}
131