FBB::ServerSocket(3bobcat)					   Server Socket					FBB::ServerSocket(3bobcat)

NAME

       FBB::ServerSocket - Server socket accepting Internet connection requests

SYNOPSIS

       #include <bobcat/serversocket>
       Linking option: -lbobcat

DESCRIPTION

       An FBB::ServerSocket may be constructed to listen for connection requests from the Internet or from the local host. Connection requests may
       be accepted in either blocking or non-blocking modes. When a connection is accepted a socket is returned which may be used to read informa-
       tion  from  or  write information to the client that requested the connection. The socket that is made available is a file descriptor which
       may be used to initialize a std::istream and/or std::ostream. The std::istream is used to read information from	the  client  process;  the
       std::ostream  is used to send information to the client process.  Since a socket may be considered a file descriptor the avaiable FBB::IFd-
       Stream, FBB::IFdStreamBuf, FBB::OFdStream, and FBB::OFdStreamBuf 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.

NAMESPACE

       FBB
       All constructors, members, operators and manipulators, mentioned in this man-page, are defined in the namespace FBB.

INHERITS FROM

       FBB::SocketBase

CONSTRUCTOR

       o      ServerSocket(size_t  port):
	      This constructor initializes an FBB::ServerSocket object, which will listen for connections at the specified port.  The construction
	      of the socket does not mean that the FBB::ServerSocket object is actually listening for connections. To start listening, the  member
	      listen() should be used.	The copy constructor is not available.

MEMBER FUNCTIONS

       All members of FBB::SocketBase (and thus of FBB::InetAddress) are available, as FBB::ServerSocket inherits from FBB::SocketBase.

       o      void listen(size_t backlog = 5, bool blocking = true):
	      The listen() member defines the way the FBB::ServerSocket will listen for clients requesting a connection.  It can be used only once
	      with a FBB::ServerSocket. An FBB::Errno object is thrown if listening fails, if the constructor could not create a socket, or if the
	      SocketBase base class could not properly be constructed.

	      The  listen() member's backlog parameter defines the size of the FBB::ServerSocket's internal queue in which connection requests may
	      be stored waiting for their turn to be serviced. When backlog requests are waiting and another request arrives, then that request is
	      lost.

	      The  member's second parameter, blocking, is used to control the blocking mode. By default, blocking is used, and listen() will wait
	      until a connection is established. This is ok in situations where clients connect infrquently and for relatively short  time  inter-
	      vals. Otherwise, in more complex programs, an FBB::Selector object can be used to sense input on the server socket and/or on various
	      client sockets.

       o      SocketBase accept():
	      The accept() member returns an FBB::SocketBase object containing information about the client whose connection request was accepted.
	      The FBB::SocketBase object's socket value may be used to initialize streams that can be used to communicate with the client. In more
	      complex programs the FBB::SocketBase could be passed to a class derived from FBB::Fork, handling the communication with the child as
	      a separate (child) process.

EXAMPLE

       See also the clientsocket(3bobcat) example.

	   #include <iostream>
	   #include <bobcat/serversocket>
	   #include <bobcat/ifdstream>
	   #include <bobcat/ofdstream>

	   #include <bobcat/a2x>

	   using namespace std;
	   using namespace FBB;

	   int main(int argc, char **argv)
	   try
	   {
	       if (argc == 1)
	       {
		   cerr << "Provide server port number
";
		   return 1;
	       }

	       size_t portnr = A2x(argv[1]);

	       ServerSocket server(portnr);

	       cerr << "server listens on port " << argv[1] << endl;

	       cerr << "serversocket returns:
" <<
		   "address = " << server.dottedDecimalAddress() << "
"
		   "port    = " << server.port() << endl;

	       int fd = server.socket();       // open the socket's descriptor

	       cout << "File descriptor of the socket is " << fd << "
"
		   "The server terminates when it receives a "
					       "single `q' on a line
"
		   "A connection is terminated when no input "
					       "is received anymore.
"
		   "Then another connection is possible" << endl;

	       server.listen(); 	       // listen in blocking mode

	       while (true)
	       {
		   SocketBase fdb = server.accept();
		   int fd = fdb.socket();

		   cerr << "Client FD = " << fd << ", " << endl <<
			   "address = " << fdb.dottedDecimalAddress() << ", " <<
			   endl <<
			   "communication through port " << fdb.port() << endl;

		   IFdStream in(fd);	       // stream to read from client
		   OFdStream out(fd);	       // stream to write to client
		   string cmd;

		   while (getline(in, cmd))
		   {
		       cout << "Got: " << cmd << endl;
		       out << "Got: " << cmd << "
" << endl;

		       if (cmd[0] == 'q')
			   return 0;
		   }
		   cout << "Ready for another connection
";
	       }
	   }
	   catch (Errno const &err)
	   {
	       cerr <<
		   err.what() << endl <<
		   "Server socket on port " << argv[1] <<
		   " can't be opened" << endl;
	       return -1;
	   }

FILES

       bobcat/serversocket - defines the class interface

SEE ALSO

       bobcat(7),  clientsocket(3bobcat),  fork(3bobcat), ifdstream(3bobcat), ifdstreambuf(3bobcat), inetaddress(3bobcat), localserversocket(3bob-
       cat), ofdstream(3bobcat), ofdstream(3bobcat), select(2), selector(3bobcat), socketbase(3bobcat)

BUGS

       None Reported.

DISTRIBUTION FILES

       o      bobcat_3.01.00-x.dsc: detached signature;

       o      bobcat_3.01.00-x.tar.gz: source archive;

       o      bobcat_3.01.00-x_i386.changes: change log;

       o      libbobcat1_3.01.00-x_*.deb: debian package holding the libraries;

       o      libbobcat1-dev_3.01.00-x_*.deb: debian package holding the libraries, headers and manual pages;

       o      http://sourceforge.net/projects/bobcat: public archive location;

BOBCAT

       Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.

COPYRIGHT

       This is free software, distributed under the terms of the GNU General Public License (GPL).

AUTHOR

       Frank B. Brokken (f.b.brokken@rug.nl).

libbobcat1-dev_3.01.00-x.tar.gz 				     2005-2012						FBB::ServerSocket(3bobcat)