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IO::Pipe

Perl 5 version 18.0 documentation
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IO::Pipe

NAME

IO::Pipe - supply object methods for pipes

SYNOPSIS

  1. 	use IO::Pipe;
  3. 	$pipe = IO::Pipe->new();
  5. 	if($pid = fork()) { # Parent
  6. 	    $pipe->reader();
  8. 	    while(<$pipe>) {
  9. 		...
  10. 	    }
  12. 	}
  13. 	elsif(defined $pid) { # Child
  14. 	    $pipe->writer();
  16. 	    print $pipe ...
  17. 	}
  19. 	or
  21. 	$pipe = IO::Pipe->new();
  23. 	$pipe->reader(qw(ls -l));
  25. 	while(<$pipe>) {
  26. 	    ...
  27. 	}

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.

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