IO::Pipe - perldoc.perl.org

Perl Programming Documentation
Download Perl
Explore

Manual

- Overview
- Tutorials
- FAQs
- History / Changes
- License

Reference

- Language
- Functions
- Operators
- Special Variables
- Pragmas
- Utilities
- Internals
- Platform Specific

Modules

- A • B • C • D • E
- F • G • H • I • L
- M • N • O • P • S
- T • U • X

Tools

- Preferences

# IO::Pipe

Perl 5 version 18.2 documentation
Go to top
Show page index • Show recent pages
Recently read

# IO::Pipe

- NAME
- SYNOPSIS
- DESCRIPTION
- CONSTRUCTOR
- METHODS
- SEE ALSO
- AUTHOR
- COPYRIGHT

# 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.

Page index

- NAME
- SYNOPSIS
- DESCRIPTION
- CONSTRUCTOR
- METHODS
- SEE ALSO
- AUTHOR
- COPYRIGHT