Provided by: libbobcat-dev_3.19.01-1ubuntu1_amd64 
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 information 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::IFdStream,
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::Exception 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 intervals. 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\n";
return 1;
}
size_t portnr = A2x(argv[1]);
ServerSocket server(portnr);
cerr << "server listens on port " << argv[1] << endl;
cerr << "serversocket returns:\n" <<
"address = " << server.dottedDecimalAddress() << "\n"
"port = " << server.port() << endl;
int fd = server.socket(); // open the socket’s descriptor
cout << "File descriptor of the socket is " << fd << "\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" << 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 << "\r" << endl;
if (cmd[0] == ’q’)
return 0;
}
cout << "Ready for another connection\n";
}
}
catch (Exception 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(3bobcat),
ofdstream(3bobcat), ofdstream(3bobcat), select(2), selector(3bobcat), socketbase(3bobcat)
BUGS
None Reported.
DISTRIBUTION FILES
o bobcat_3.19.01-x.dsc: detached signature;
o bobcat_3.19.01-x.tar.gz: source archive;
o bobcat_3.19.01-x_i386.changes: change log;
o libbobcat1_3.19.01-x_*.deb: debian package holding the libraries;
o libbobcat1-dev_3.19.01-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).