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<html><head>
<title>FBB::LocalServerSocket</title>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1>FBB::LocalServerSocket</h1>
<h2>libbobcat-dev_3.19.01-x.tar.gz</h2>
<h2>2005-2013</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::LocalServerSocket(3bobcat)</title>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1>FBB::LocalServerSocket(3bobcat)</h1>
<h2>libbobcat-dev_3.19.01-x.tar.gz Unix Domain Server Socket</h2>
<h2>2005-2013</h2>


<p>
<h2>NAME</h2>FBB::LocalServerSocket - Unix Domain Server socket accepting connection requests
<p>
<h2>SYNOPSIS</h2>
    <strong>#include &lt;bobcat/localserversocket&gt;</strong><br>
    Linking option: <em>-lbobcat</em> 
<p>
<h2>DESCRIPTION</h2>
    An <strong>FBB::LocalServerSocket</strong> defines a Unix Domain server socket,
listening for connection requests from the local host using a Unix Domain
socket. 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
requesting 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::LocalSocketBase</strong>
<p>
<h2>ENUMERATION</h2>
    The following enumeration is defined in th class
<strong>FBB::LocalServerSocket</strong>:
<p>
<strong>enum Socket</strong><br>
    This enumeration holds two values:
    <ul>
    <li> <strong>KEEP</strong>:<br>
        When this value is specified at construction time, the file
representing the Unix Domain Socket will not be removed when the
<strong>LocalServerSocket</strong> is destroyed. This is the default value used with the
<strong>LocalServerSocket</strong> constructor.
    <li> <strong>UNLINK</strong>:<br>
        When this value is specified at construction time, the file
representing the Unix Domain Socket will be removed when the
<strong>LocalServerSocket</strong> is destroyed.
    </ul>
<p>
<h2>CONSTRUCTOR</h2>
    <ul>
    <li> <strong>LocalServerSocket()</strong>:<br> 
        This constructor creates an empty (non-functioning)
<em>FBB::LocalServerSocket</em> object. Before it can be used, the <em>open()</em> member
must be called (see below).
    <li> <strong>LocalServerSocket(string const &amp;name, Socket action = KEEP) 
        throw (Exception)</strong>:<br>
        This constructor initializes an <strong>FBB::LocalServerSocket</strong> object,
which will listen for connection requests using the named Unix Domain
socket.  An <strong>FBB::Exception</strong> is thrown if the socket could not be
constructed. If the constructor is given a second argument
<em>FBB::LocalServerSocket::UNLINK</em>, the constructed socket will be unlinked
when the <strong>FBB::LocalServerSocket</strong> object is destroyed.  The construction of
the socket does not mean that the <strong>FBB::LocalServerSocket</strong> object is
actually listening for connections. To start listening, the member
<strong>listen()</strong> should be called.
    </ul>
    The copy constructor is not available.
<p>
<h2>MEMBER FUNCTIONS</h2>
    <ul>
    <li> <strong>size_t accept()</strong>:<br>
        The <strong>accept()</strong> member returns an <em>size_t</em> which is a file
descriptor (socket) that may be used to communicate with the client requesting
the connection. In more complex programs the returned file descriptor (socket)
could be passed to a class derived from <strong>FBB::Fork</strong>, handling the
communication with the child as a separate (child) process.
<p>
<li> <strong>void listen(size_t backlog = 5, bool blocking = true)</strong>:<br>
        The <strong>listen()</strong> member defines the way the <strong>FBB::LocalServerSocket</strong>
will listen for clients requesting a connection.  It can be used only once
with a <strong>FBB::LocalServerSocket</strong>. An <strong>FBB::Exception</strong> object is thrown if
listening fails.
<p>
The <strong>listen()</strong> member's <em>backlog</em> parameter defines the size of the
<strong>FBB::LocalServerSocket</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>void open(string const &amp;name, Socket action = KEEP)</strong>:<br>
        This member prepares a <strong>FBB::LocalServerSocket</strong> object for use. It
should only be used in combination with the default constructor. Following
<em>open()</em> the <em>FBB:::LocalServerSocket</em> object will be able to listen for
connection requests using the named Unix Domain socket.  An <strong>FBB::Exception</strong> is
thrown if the socket could not be constructed. If the a second argument
<em>FBB::LocalServerSocket::UNLINK</em>, is provided the constructed socket will be
unlinked when the <strong>FBB::LocalServerSocket</strong> object is destroyed.  The
construction of the socket does not mean that the <strong>FBB::LocalServerSocket</strong>
object is actually listening for connections. To start listening, the member
<strong>listen()</strong> should be called next.
    </ul>
<p>
<h2>EXAMPLE</h2>
    See also the <strong>localclientsocket</strong>(3bobcat) example.
        <pre>

    #include &lt;iostream&gt;
    #include &lt;bobcat/localserversocket&gt;
    #include &lt;bobcat/ifdstream&gt;
    #include &lt;bobcat/ofdstream&gt;
    
    using namespace std;
    using namespace FBB;
    
    int main(int argc, char **argv)
    try
    {
        if (argc == 1)
        {
            cerr &lt;&lt; "Provide local filename, e.g., /tmp/uds\n";
            return 1;
        }
    
        LocalServerSocket server(argv[1]);
    
        cerr &lt;&lt; "server using `" &lt;&lt; argv[1] &lt;&lt; "'" &lt;&lt; endl;
    
        cout &lt;&lt; 
            "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)
        {
            int fd = server.accept();
    
            cerr &lt;&lt; "Client FD = " &lt;&lt; fd &lt;&lt; ", " &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 (Exception 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>localclientsocket</strong>(3bobcat), <strong>fork</strong>(3bobcat),
<strong>ifdstream</strong>(3bobcat), <strong>ifdstreambuf</strong>(3bobcat),
<strong>localsocketbase</strong>(3bobcat), <strong>ofdstream</strong>(3bobcat), <strong>ofdstream</strong>(3bobcat),
<strong>select</strong>(2), <strong>selector</strong>(3bobcat), <strong>serversocket</strong>(3bobcat)
<p>
<h2>BUGS</h2>
    None Reported.
<p>

<h2>DISTRIBUTION FILES</h2>
    <ul>
    <li> <em>bobcat_3.19.01-x.dsc</em>: detached signature;
    <li> <em>bobcat_3.19.01-x.tar.gz</em>: source archive;
    <li> <em>bobcat_3.19.01-x_i386.changes</em>: change log;
    <li> <em>libbobcat1_3.19.01-x_*.deb</em>: debian package holding the
            libraries;
    <li> <em>libbobcat1-dev_3.19.01-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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