08-27-2009
Client/Server Socket Application - Preventing Client from quitting on server crash
Problem
- Linux Client/Server Socket Application: Preventing Client from quitting on server crash
Hi,
I am writing a Linux socket Server and Client using TCP protocol on Ubuntu 9.04 x64.
I am having problem trying to implement a scenario where the client should keep running even when the server crashes(because of any reason).
By default, when server closes because of error or when killed by closing the window, the client also quits. I have to somehow handle this situation and make sure the client keeps on running and restarts under this scenario.
I think I need to do handle some unix signals in my client application, I am not sure which ones and how? Can anyone suggest how to go about doing this.
Thanks for suggestions in advance.
Regards
Varun
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LEARN ABOUT DEBIAN
net::smtp::server::client
Server::Client(3pm) User Contributed Perl Documentation Server::Client(3pm)
NAME
Net::SMTP::Server::Client - Client session handling for Net::SMTP::Server.
SYNOPSIS
use Carp;
use Net::SMTP::Server;
use Net::SMTP::Server::Client;
use Net::SMTP::Server::Relay;
$server = new Net::SMTP::Server('localhost', 25) ||
croak("Unable to handle client connection: $!
");
while($conn = $server->accept()) {
# We can perform all sorts of checks here for spammers, ACLs,
# and other useful stuff to check on a connection.
# Handle the client's connection and spawn off a new parser.
# This can/should be a fork() or a new thread,
# but for simplicity...
my $client = new Net::SMTP::Server::Client($conn) ||
croak("Unable to handle client connection: $!
");
# Process the client. This command will block until
# the connecting client completes the SMTP transaction.
$client->process || next;
# In this simple server, we're just relaying everything
# to a server. If a real server were implemented, you
# could save email to a file, or perform various other
# actions on it here.
my $relay = new Net::SMTP::Server::Relay($client->{FROM},
$client->{TO},
$client->{MSG});
}
DESCRIPTION
The Net::SMTP::Server::Client module implements all the session handling required for a Net::SMTP::Server::Client connection. The above
example demonstrates how to use Net::SMTP::Server::Client with Net::SMTP::Server to handle SMTP connections.
$client = new Net::SMTP::Server::Client($conn)
Net::SMTP::Server::Client accepts one argument that must be a handle to a connection that will be used for communication.
Once you have a new client session, simply call:
$client->process
This processes an SMTP transaction. THIS MAY APPEAR TO HANG -- ESPECIALLY IF THERE IS A LARGE AMOUNT OF DATA BEING SENT. Once this method
returns, the server will have processed an entire SMTP transaction, and is ready to continue.
Once $client->process returns, various fields have been filled in. Those are:
$client->{TO} -- This is an array containing the intended
recipients for this message. There may be
multiple recipients for any given message.
$client->{FROM} -- This is the sender of the given message.
$client->{MSG} -- The actual message data. :)
AUTHOR AND COPYRIGHT Net::SMTP::Server / SMTP::Server is Copyright(C) 1999, MacGyver (aka Habeeb J. Dihu) <macgyver@tos.net>. ALL RIGHTS
RESERVED.
You may distribute this package under the terms of either the GNU General Public License or the Artistic License, as specified in the Perl
README file.
SEE ALSO
Net::SMTP::Server::Server, Net::SMTP::Server::Relay
perl v5.10.1 1999-12-28 Server::Client(3pm)