IO::Pipe

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



NAME
       IO::pipe - supply object methods for pipes

SYNOPSIS
               use IO::Pipe;

               $pipe = new IO::Pipe;

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

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

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

                   print $pipe ....
               }

               or

               $pipe = new IO::Pipe;

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

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


DESCRIPTION
       IO::Pipe provides an interface to createing pipes between processes.

CONSTRCUTOR
       new ( [READER, WRITER] )
           Creates a 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
       the IO::Handle manpage

AUTHOR
       Graham Barr <bodg@tiuk.ti.com>

COPYRIGHT
       Copyright (c) 1996 Graham Barr. All rights reserved. This program is
       free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.

















3rd Berkeley Distribution    perl 5.005, patch 02                  IO::Pipe(3)