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 Perl/perl5#issues.