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 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.