PerlIO::Util - A selection of general PerlIO utilities

This document describes PerlIO::Util version 0.72.

	use PerlIO::Util;

    # utility layers

	# open and flock(IN, LOCK_EX)
	$io = PerlIO::Util->open('+< :flock', $file);

	# open with O_CREAT | O_EXCL
	$io = PerlIO::Util->open('+<:creat :excl', $file);

    my $out = PerlIO::Util->open('>:tee', 'file.txt', \$scalar, \*STDERR);
    print $out 'foo'; # print to 'file.txt', $scalar and *STDERR

    # utility routines

    *STDOUT->push_layer(scalar => \$scalar); # it dies on fail
    print 'foo'; # to $scalar

    print *STDOUT->pop_layer(); # => scalar
    print $scalar; # to *STDOUT

PerlIO::Util provides general PerlIO utilities: utility layers and utility methods.

Utility layers are a part of PerlIO::Util, but you don't need to say use PerlIO::Util for loading them. They will be automatically loaded.

Easy interface to flock().

See PerlIO::flock.

Use of O_CREAT without Fcntl.

See PerlIO::creat.

Use of O_EXCL without Fcntl.

See PerlIO::excl.

Multiplex output stream.

See PerlIO::tee.

PerlIO interface to directory functions.

See PerlIO::dir.

Reverse input stream.

See PerlIO::reverse.

Mediation of filesystem encoding.

This layer was split into an independent distribution, PerlIO::fse.

See PerlIO::fse.

Calls built-in open(), and returns an IO::Handle instance named args. It dies on fail.

Unlike Perl's open() (nor IO::File's), mode is always required.

Returns the known layer names.

Returns the names of the PerlIO layers on FILEHANDLE.

See Querying the layers of filehandles in PerlIO.

Almost equivalent to binmode(FILEHANDLE, ':layer(arg)'), but accepts any type of arg, e.g. a scalar reference to the :scalar layer.

This method dies on fail. Otherwise, it returns FILEHANDLE.

Equivalent to binmode(FILEHANDLE, ':pop'). It removes a top level layer from FILEHANDLE, but note that you cannot remove dummy layers such as :utf8 or :flock.

This method returns the name of the popped layer.

Perl 5.8.1 or later, and a C compiler.

No bugs have been reported.

Please report any bugs or feature requests to <gfuji(at)cpan.org>, or through the web interface at http://rt.cpan.org/.

PerlIO::flock, PerlIO::creat, PerlIO::excl, PerlIO::tee, PerlIO::dir, PerlIO::reverse, PerlIO::fse.

PerlIO for push_layer() and pop_layer().

perliol for implementation details.

open in perlfunc.

perlopentut.

Goro Fuji (藤 吾郎) <gfuji(at)cpan.org>.

Copyright (c) 2008-2010, Goro Fuji <gfuji(at)cpan.org>. Some rights reserved.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.