IO::Pipe(3p) · carta

Usage

        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>) {
            ...
        }

Overview

"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.

Releases

32 releases since OpenBSD 5.0; the text changed 20 times.