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<html><head>
<title>FBB::ServerSocket</title>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1>FBB::ServerSocket</h1>
<h2>libbobcat1-dev_2.20.01-x.tar.gz</h2>
<h2>2005-2011</h2>

<html><head>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1></h1>

<html><head>
<title>FBB::ServerSocket(3bobcat)</title>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1>FBB::ServerSocket(3bobcat)</h1>
<h2>libbobcat1-dev_2.20.01-x.tar.gz Server Socket</h2>
<h2>2005-2011</h2>


<p>
<h2>NAME</h2>FBB::ServerSocket - Server socket accepting Internet connection requests
<p>
<h2>SYNOPSIS</h2>
    <strong>#include &lt;bobcat/serversocket&gt;</strong><br>
    Linking option: <em>-lbobcat</em> 
<p>
<h2>DESCRIPTION</h2>
    An <strong>FBB::ServerSocket</strong> may be constructed to listen for connection
requests from the Internet or from the local host. Connection requests may be
accepted in either <em>blocking</em> or <em>non-blocking</em> modes. When a connection
is accepted a socket is returned which may be used to read information from or
write information to the client that requested the connection. The socket that
is made available is a <em>file descriptor</em> which may be used to initialize a
<strong>std::istream</strong> and/or <strong>std::ostream</strong>. The <strong>std::istream</strong> is used to read
information from the client process; the <strong>std::ostream</strong> is used to send
information to the client process.  Since a socket may be considered a <em>file
descriptor</em> the avaiable <strong>FBB::IFdStream</strong>, <strong>FBB::IFdStreamBuf</strong>,
<strong>FBB::OFdStream</strong>, and <strong>FBB::OFdStreamBuf</strong> classes may be used profitably
here. Note that having available a socket does not mean that this defines the
communication protocol. It is (still) the responsibility of the programmer to
comply with an existing protocol or to implement a tailor-made protocol. The
latter situation implies that the sequence of input- and output operations is
defined by the programmer.
<p>
<h2>NAMESPACE</h2>
    <strong>FBB</strong><br>
    All constructors, members, operators and manipulators, mentioned in this
man-page, are defined in the namespace <strong>FBB</strong>.
<p>
<h2>INHERITS FROM</h2>
    <strong>FBB::SocketBase</strong>
<p>
<h2>CONSTRUCTOR</h2>
    <ul>
    <li> <strong>ServerSocket(size_t  port)</strong>:<br>
        This constructor initializes an <strong>FBB::ServerSocket</strong> object, which
will listen for connections at the specified port.  The construction of the
socket does not mean that the <strong>FBB::ServerSocket</strong> object is actually
listening for connections. To start listening, the member <strong>listen()</strong> should
be used.
    </ul>
    The copy constructor is not available.
<p>
<h2>MEMBER FUNCTIONS</h2>
     All members of <strong>FBB::SocketBase</strong> (and thus of <strong>FBB::InetAddress</strong>) are
available, as <strong>FBB::ServerSocket</strong> inherits from <strong>FBB::SocketBase</strong>.
    <ul>
    <li> <strong>void listen(size_t backlog = 5, bool blocking = true)</strong>:<br>
        The <strong>listen()</strong> member defines the way the <strong>FBB::ServerSocket</strong> will
listen for clients requesting a connection.  It can be used only once with a
<strong>FBB::ServerSocket</strong>. An <strong>FBB::Errno</strong> object is thrown if listening fails,
if the constructor could not create a socket, or if the <strong>SocketBase</strong> base
class could not properly be constructed.
<p>
The <strong>listen()</strong> member's <em>backlog</em> parameter defines the size of the
<strong>FBB::ServerSocket</strong>'s internal queue in which connection requests may be
stored waiting for their turn to be serviced. When <em>backlog</em> requests are
waiting and another request arrives, then that request is lost. 
<p>
The member's second parameter, <em>blocking</em>, is used to control the
blocking mode. By default, blocking is used, and <em>listen()</em> will wait until
a connection is established. This is ok in situations where clients connect
infrquently and for relatively short time intervals. Otherwise, in more
complex programs, an <strong>FBB::Selector</strong> object can be used to sense input on
the server socket and/or on various client sockets.
<p>
<li> <strong>SocketBase accept()</strong>:<br>
        The <strong>accept()</strong> member returns an <strong>FBB::SocketBase</strong> object
containing information about the client whose connection request was
accepted. The <strong>FBB::SocketBase</strong> object's socket value may be used to
initialize streams that can be used to communicate with the client. In more
complex programs the <strong>FBB::SocketBase</strong> could be passed to a class derived
from <strong>FBB::Fork</strong>, handling the communication with the child as a separate
(child) process. 
    </ul>
<p>
<h2>EXAMPLE</h2>
    See also the <strong>clientsocket</strong>(3bobcat) example.
        <pre>

    #include &lt;iostream&gt;
    #include &lt;bobcat/serversocket&gt;
    #include &lt;bobcat/ifdstream&gt;
    #include &lt;bobcat/ofdstream&gt;
    
    #include &lt;bobcat/a2x&gt;
    
    using namespace std;
    using namespace FBB;
    
    int main(int argc, char **argv)
    try
    {
        if (argc == 1)
        {
            cerr &lt;&lt; "Provide server port number\n";
            return 1;
        }
    
        size_t portnr = A2x(argv[1]);
    
        ServerSocket server(portnr);
    
        cerr &lt;&lt; "server listens on port " &lt;&lt; argv[1] &lt;&lt; endl;
    
        cerr &lt;&lt; "serversocket returns:\n" &lt;&lt;
            "address = " &lt;&lt; server.dottedDecimalAddress() &lt;&lt; "\n"
            "port    = " &lt;&lt; server.port() &lt;&lt; endl;
    
        int fd = server.socket();       // open the socket's descriptor
    
        cout &lt;&lt; "File descriptor of the socket is " &lt;&lt; fd &lt;&lt; "\n"
            "The server terminates when it receives a "
                                        "single `q' on a line\n"
            "A connection is terminated when no input "
                                        "is received anymore.\n"
            "Then another connection is possible" &lt;&lt; endl;
    
        server.listen();                // listen in blocking mode
    
        while (true)
        {
            SocketBase fdb = server.accept();
            int fd = fdb.socket();
    
            cerr &lt;&lt; "Client FD = " &lt;&lt; fd &lt;&lt; ", " &lt;&lt; endl &lt;&lt;
                    "address = " &lt;&lt; fdb.dottedDecimalAddress() &lt;&lt; ", " &lt;&lt; 
                    endl &lt;&lt;
                    "communication through port " &lt;&lt; fdb.port() &lt;&lt; endl;
    
            IFdStream in(fd);           // stream to read from client
            OFdStream out(fd);          // stream to write to client
            string cmd;
            
            while (getline(in, cmd))
            {
                cout &lt;&lt; "Got: " &lt;&lt; cmd &lt;&lt; endl;
                out &lt;&lt; "Got: " &lt;&lt; cmd &lt;&lt; "\r" &lt;&lt; endl;
    
                if (cmd[0] == 'q')
                    return 0;
            }
            cout &lt;&lt; "Ready for another connection\n";
        }
    }
    catch (Errno const &amp;err)
    {
        cerr &lt;&lt;
            err.what() &lt;&lt; endl &lt;&lt;
            "Server socket on port " &lt;&lt; argv[1] &lt;&lt; 
            " can't be opened" &lt;&lt; endl;
        return -1;
    }        
        
</pre>

<p>
<h2>FILES</h2>
    <em>bobcat/serversocket</em> - defines the class interface
<p>
<h2>SEE ALSO</h2>
    <strong>bobcat</strong>(7), <strong>clientsocket</strong>(3bobcat), <strong>fork</strong>(3bobcat),
<strong>ifdstream</strong>(3bobcat), <strong>ifdstreambuf</strong>(3bobcat), <strong>inetaddress</strong>(3bobcat),
<strong>localserversocket</strong>(3bobcat), <strong>ofdstream</strong>(3bobcat),
<strong>ofdstream</strong>(3bobcat), <strong>select</strong>(2), <strong>selector</strong>(3bobcat),
<strong>socketbase</strong>(3bobcat)
<p>
<h2>BUGS</h2>
    None Reported.
<p>

<h2>DISTRIBUTION FILES</h2>
    <ul>
    <li> <em>bobcat_2.20.01-x.dsc</em>: detached signature;
    <li> <em>bobcat_2.20.01-x.tar.gz</em>: source archive;
    <li> <em>bobcat_2.20.01-x_i386.changes</em>: change log;
    <li> <em>libbobcat1_2.20.01-x_*.deb</em>: debian package holding the
            libraries;
    <li> <em>libbobcat1-dev_2.20.01-x_*.deb</em>: debian package holding the
            libraries, headers and manual pages;
    <li> <em>http://sourceforge.net/projects/bobcat</em>: public archive location;
    </ul>
<p>
<h2>BOBCAT</h2>
    Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.
<p>
<h2>COPYRIGHT</h2>
    This is free software, distributed under the terms of the 
    GNU General Public License (GPL).
<p>
<h2>AUTHOR</h2>
    Frank B. Brokken (<strong>f.b.brokken@rug.nl</strong>).
<p>

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