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
netsds::app::smtpd
NetSDS::App::SMTPD(3pm) User Contributed Perl Documentation NetSDS::App::SMTPD(3pm)
NAME
NetSDS::App::SMTPD
SYNOPSIS
use NetSDS::App::SMTPD
Packages
NetSDS::App::SMTPD::Socket
Needs for work with socket. This module is a parent for NetSDS::App::SMTPD and NetSDS::App::SMTPD::Client and a child of a NetSDS::APP
ITEMS
create_socket
Creating a simple socket which could be transformed into a listening in NetSDS::App::SMTPD and could be used in
NetSDS::App::SMTPD::Client for accept connection
can_read
This method uses for making a timeout before connections to the server: if there is no connections to accept, program would be just
waiting in select while the connection appeared.
close_socket
Close socket
NetSDS::App::SMTPD::Client
Provides the smtp protocol bu using Net::Server::Mail::SMTP. Had attributes: smtp - an object of Net::Server::Mail::SMTP, ip - ip of the
remote host, headers - ref hash with headers of a message, msg - a body of a message.
ITEMS
set_callback and process
All that subs do - its only call the methods of a Net::Server::Mail::SMTP with the same name.
get_mail
In this sub we parse message and set headers of the object and message body. This sub is call as a callback on event DATA
get_header and get_msg
Get methods that make you access to a header of a msg and message body. Example: $client->get_header('FROM') or
$client->get_header('to');
NetSDS::App::SMTPD
This module init a smtp-server.
ITEMS
create_socket
Init a listening socket by creating a simple socket Super::create_socket and make it listening.
data Takes - a message that has been received, parses them and prepare the structure of headers, body for next actions
accept Waiting for an smtp connection and that accept it.
data
process
Example
#!/usr/bin/env perl
use strict;
use warnings;
Receiver->run(
infinite => 1,
debug => 1,
verbose => 1,
conf_file => '../conf/mts-receiver.conf',
);
1;
package Receiver;
use base 'NetSDS::App::SMTPD';
sub process {
my $self = shift;
my $client = $self->SUPER::process;
#do something with msg;
my $from = $client->get_header('from');
my $msg = $client->get_msg;
.....
return $self;
};
or you could reinit process like this:
sub process {
my $self = shift;
my $client = $self->accept;
return unless $client;
$client->process;
#do something
......
$client->close;
return $self;
};
AUTHOR
Yana Kornienko <yana@netstyle.com.ua>
perl v5.10.1 2010-04-28 NetSDS::App::SMTPD(3pm)