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.\" ========================================================================
.\"
.IX Title "IO::Pipe 3"
.TH IO::Pipe 3 "2019-10-24" "perl v5.30.2" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
IO::Pipe \- supply object methods for pipes
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& 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>) {
\& ...
\& }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\f(CW\*(C`IO::Pipe\*(C'\fR provides an interface to creating pipes between
processes.
.SH "CONSTRUCTOR"
.IX Header "CONSTRUCTOR"
.IP "new ( [\s-1READER, WRITER\s0] )" 4
.IX Item "new ( [READER, WRITER] )"
Creates an \f(CW\*(C`IO::Pipe\*(C'\fR, which is a reference to a newly created symbol
(see the \f(CW\*(C`Symbol\*(C'\fR package). \f(CW\*(C`IO::Pipe::new\*(C'\fR optionally takes two
arguments, which should be objects blessed into \f(CW\*(C`IO::Handle\*(C'\fR, or a
subclass thereof. These two objects will be used for the system call
to \f(CW\*(C`pipe\*(C'\fR. If no arguments are given then method \f(CW\*(C`handles\*(C'\fR is called
on the new \f(CW\*(C`IO::Pipe\*(C'\fR object.
.Sp
These two handles are held in the array part of the \s-1GLOB\s0 until either
\&\f(CW\*(C`reader\*(C'\fR or \f(CW\*(C`writer\*(C'\fR is called.
.SH "METHODS"
.IX Header "METHODS"
.IP "reader ([\s-1ARGS\s0])" 4
.IX Item "reader ([ARGS])"
The object is re-blessed into a sub-class of \f(CW\*(C`IO::Handle\*(C'\fR, and becomes a
handle at the reading end of the pipe. If \f(CW\*(C`ARGS\*(C'\fR are given then \f(CW\*(C`fork\*(C'\fR
is called and \f(CW\*(C`ARGS\*(C'\fR are passed to exec.
.IP "writer ([\s-1ARGS\s0])" 4
.IX Item "writer ([ARGS])"
The object is re-blessed into a sub-class of \f(CW\*(C`IO::Handle\*(C'\fR, and becomes a
handle at the writing end of the pipe. If \f(CW\*(C`ARGS\*(C'\fR are given then \f(CW\*(C`fork\*(C'\fR
is called and \f(CW\*(C`ARGS\*(C'\fR are passed to exec.
.IP "handles ()" 4
.IX Item "handles ()"
This method is called during construction by \f(CW\*(C`IO::Pipe::new\*(C'\fR
on the newly created \f(CW\*(C`IO::Pipe\*(C'\fR object. It returns an array of two objects
blessed into \f(CW\*(C`IO::Pipe::End\*(C'\fR, or a subclass thereof.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
IO::Handle
.SH "AUTHOR"
.IX Header "AUTHOR"
Graham Barr. Currently maintained by the Perl Porters. Please report all
bugs to <perlbug@perl.org>.
.SH "COPYRIGHT"
.IX Header "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.