NAME

Perl::Critic::Policy::InputOutput::RequireCheckedOpen - Write "my $error = open $fh, $mode, $filename;" instead of "open $fh, $mode, $filename;".

AFFILIATION

This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

The perl builtin I/O function "open" returns a false value on failure. That value should always be checked to ensure that the open was successful.

    my $error = open( $filehandle, $mode, $filename );                  # ok
    open( $filehandle, $mode, $filename ) or die "unable to open: $!";  # ok
    open( $filehandle, $mode, $filename );                              # not ok
    use autodie;
    open $filehandle, $mode, $filename;                                 # ok

You can use autodie, Fatal, or Fatal::Exception to get around this. Currently, autodie is not properly treated as a pragma; its lexical effects aren't taken into account.

CONFIGURATION

If you create a module that exports "autodie" you can tell this policy about it with the "autodie_modules" setting:

    [InputOutput::RequireCheckedSyscalls]
    autodie_modules = My::Thing

AUTHOR

Andrew Moore <amoore@mooresystems.com>

ACKNOWLEDGMENTS

This policy module is based heavily on policies written by Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>.

COPYRIGHT

Copyright (c) 2007-2011 Andrew Moore. All rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license can be found in the LICENSE file included with this module.