oracular (3) IO::Pipe.3perl.gz

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 at
       <https://github.com/Perl/perl5/issues>.

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.