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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(3)


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 v5.24.0                      2016-02-05                     IO::Pipe(3pm)

perl 5.24 - Generated Sun Nov 13 19:43:00 CST 2016
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