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	PerlMonks

by root (Monk)

on Dec 23, 1999 at 00:52 UTC ( [id://1220]=perlfunc: print w/replies, xml )

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IO::Pipe

See the current Perl documentation for IO::Pipe.

Here is our local, out-dated (pre-5.6) version:

IO::pipe - supply object methods for pipes

        use IO::Pipe;

        $pipe = new IO::Pipe;

        if($pid = fork()) { # Parent
            $pipe->reader();

            while(<$pipe> {
                ....
            }

IO::Pipe provides an interface to createing pipes between processes.

CONSTRCUTOR

new ( [READER, WRITER] ): Creates a 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.

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.