poe::pipe::twoway(3pm) [debian man page]

POE::Pipe::TwoWay(3pm)					User Contributed Perl Documentation				    POE::Pipe::TwoWay(3pm)

NAME

       POE::Pipe::TwoWay - a portable API for two-way pipes

SYNOPSIS

	 my ($a_read, $a_write, $b_read, $b_write) = POE::Pipe::TwoWay->new();
	 die "couldn't create a pipe: $!" unless defined $a_read;

DESCRIPTION

       Pipes are troublesome beasts because there are a few different, incompatible ways to create them, and many operating systems implement some
       subset of them.	Therefore it's impossible to rely on a particular method for their creation.

       POE::Pipe::TwoWay will attempt to create a bidirectional pipe using an appropriate method.  If that fails, it will fall back to some other
       means until success or all methods have been exhausted.	Some operating systems require certain exceptions, which are hardcoded into the
       library.

       The upshot of all this is that an application can use POE::Pipe::TwoWay to create a bidirectional pipe without worrying about the mechanism
       that works in the current run-time environment.

       By the way, POE::Pipe::TwoWay doesn't use POE internally, so it may be used in stand-alone applications without POE.

PUBLIC METHODS

   new [TYPE]
       Create a new two-way pipe, optionally constraining it to a particular TYPE of pipe.  Two-way pipes have two ends, both of which can be read
       from and written to.  Therefore, a successful new() call will return four handles: read and write for one end, and read and write for the
       other.  On failure, new() sets $! to describe the error and returns nothing.

	 my ($a_read, $a_write, $b_read, $b_write) = POE::Pipe::TwoWay->new();
	 die $! unless defined $a_read;

       TYPE may be one of "pipe", "socketpair", or "inet".  When set, POE::Pipe::TwoWay will constrain its search to either "pipe()", a UNIX-
       domain "socketpair()", or plain old sockets, respectively.  Otherwise new() will try each method in order, or a particular method
       predetermined to be the best one for the current operating environment.

BUGS

       POE::Pipe::OneWay may block up to one second on some systems if failure occurs while trying to create "inet" sockets.

SEE ALSO

       POE::Pipe, POE::Pipe::OneWay.

AUTHOR &; COPYRIGHT
       POE::Pipe::TwoWay is copyright 2000-2008 by Rocco Caputo.  All rights reserved.	POE::Pipe::TwoWay is free software; you may redistribute
       it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2012-05-15						    POE::Pipe::TwoWay(3pm)

Check Out this Related Man Page

IO::Pipe(3pm)						 Perl Programmers Reference Guide					     IO::Pipe(3pm)

NAME

       IO::Pipe - supply object methods for pipes

SYNOPSIS

	       use IO::Pipe;

	       $pipe = IO::Pipe->new();

	       if($pid = fork()) { # Parent
		   $pipe->reader();

		   while(<$pipe>) {
		       ...
		   }

	       }
	       elsif(defined $pid) { # Child
		   $pipe->writer();

		   print $pipe ...
	       }

	       or

	       $pipe = IO::Pipe->new();

	       $pipe->reader(qw(ls -l));

	       while(<$pipe>) {
		   ...
	       }

DESCRIPTION

       "IO::Pipe" provides an interface to creating pipes between processes.

CONSTRUCTOR

       new ( [READER, WRITER] )
	   Creates an "IO::Pipe", which is a reference to a newly created symbol (see the "Symbol" package). "IO::Pipe::new" optionally takes two
	   arguments, which should be objects blessed into "IO::Handle", or a subclass thereof. These two objects will be used for the system call
	   to "pipe". If no arguments are given then method "handles" is called on the new "IO::Pipe" object.

	   These two handles are held in the array part of the GLOB until either "reader" or "writer" is called.

METHODS

       reader ([ARGS])
	   The object is re-blessed into a sub-class of "IO::Handle", and becomes a handle at the reading end of the pipe. If "ARGS" are given
	   then "fork" is called and "ARGS" are passed to exec.

       writer ([ARGS])
	   The object is re-blessed into a sub-class of "IO::Handle", and becomes a handle at the writing end of the pipe. If "ARGS" are given
	   then "fork" is called and "ARGS" are passed to exec.

       handles ()
	   This method is called during construction by "IO::Pipe::new" on the newly created "IO::Pipe" object. It returns an array of two objects
	   blessed into "IO::Pipe::End", or a subclass thereof.

SEE ALSO

       IO::Handle

AUTHOR

       Graham Barr. Currently maintained by the Perl Porters.  Please report all bugs to <perlbug@perl.org>.

COPYRIGHT

       Copyright (c) 1996-8 Graham Barr <gbarr@pobox.com>. All rights reserved.  This program is free software; you can redistribute it and/or
       modify it under the same terms as Perl itself.

perl v5.16.3							    2013-03-04							     IO::Pipe(3pm)

Linux and UNIX Man Pages

poe::pipe::twoway(3pm) [debian man page]

Check Out this Related Man Page