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Full Discussion: Using socket to test a TCP port
Top Forums Programming Using socket to test a TCP port Post 302516979 by Loic Domaigne on Monday 25th of April 2011 04:25:37 PM
Old 04-25-2011
Assuming that you're implementing a TCP client, you have the following possibilities:

1) The connect() is carried out in a separate thread; another thread implements the timer. Upon timeout, the connect thread can be cancelled since connect() is a cancellation point.

2) You raise a signal when a timer expired to the thread calling connect(). This will cause connect() to be interrupted. Only useful for single threaded program; for multi-threaded program use 1) or 3).

3) You use non blocking socket, see a the snippet below
Code:
flags=fcntl(fd, F_GETFL, 0);
fcntl(fd, F_SETFL, flags | O_NONBLOCK);
connect(fd,&addr,len);
...

Then you need to poll() for both read/write events:
Code:
struct pollfd fds;
fds.fd = fd;
fds.events = POLLIN | POLLOUT;
poll(&fds,1,timeout)
...

Error checking is omitted for your convenient (DISCLAIMER: DON'T do this for production code)

HTH, Loïc
 

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LEARN ABOUT DEBIAN

net::proxy::connector::tcp

Net::Proxy::Connector::tcp(3pm) 			User Contributed Perl Documentation			   Net::Proxy::Connector::tcp(3pm)

NAME

       Net::Proxy::Connector::tcp - Net::Proxy connector for standard tcp proxies

SYNOPSIS

	   # sample proxy using Net::Proxy::Connector::tcp
	   use Net::Proxy;

	   my $proxy = Net::Proxy->new(
	       in  => { type => tcp, port => '6789' },
	       out => { type => tcp, host => 'remotehost', port => '9876' },
	   );
	   $proxy->register();

	   Net::Proxy->mainloop();

DESCRIPTION

       "Net::Proxy::Connector::tcp" is a connector for handling basic, standard TCP connections.

CONNECTOR OPTIONS

       The connector accept the following options:

   "in"
       o   host

	   The listening address. If not given, the default is "localhost".

       o   port

	   The listening port.

   "out"
       o   host

	   The remote host.

       o   port

	   The remote port.

       o   timeout

	   The socket timeout for connection ("out" only).

AUTHOR

       Philippe 'BooK' Bruhat, "<book@cpan.org>".

COPYRIGHT

       Copyright 2006 Philippe 'BooK' Bruhat, All Rights Reserved.

LICENSE

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.10.1							    2009-10-18					   Net::Proxy::Connector::tcp(3pm)
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