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File Name : RequireCheckedOpen.pm

package Perl::Critic::Policy::InputOutput::RequireCheckedOpen;

use 5.010001;
use strict;
use warnings;
use Readonly;

use Perl::Critic::Utils qw{ :severities :classification };
use parent 'Perl::Critic::Policy';

our $VERSION = '1.156';

#-----------------------------------------------------------------------------

Readonly::Scalar my $DESC => q{Return value of "open" ignored};
Readonly::Scalar my $EXPL => q{Check the return value of "open" for success};

#-----------------------------------------------------------------------------

sub supported_parameters {
    return (
        {
            name            => 'autodie_modules',
            description     => 'Modules which export autodie.',
            default_string  => 'autodie',
            behavior        => 'string list',
        },
    );
}

sub default_severity     { return $SEVERITY_MEDIUM       }
sub default_themes       { return qw( core maintenance certrule ) }
sub applies_to           { return 'PPI::Token::Word'     }

#-----------------------------------------------------------------------------

sub violates {
    my ( $self, $elem, undef ) = @_;

return if $elem->content() ne 'open';
    return if ! is_unchecked_call( $elem, [ keys %{ $self->{_autodie_modules} } ] );

return $self->violation( $DESC, $EXPL, $elem );

}

__END__

#-----------------------------------------------------------------------------

=pod

=for stopwords autodie

=head1 NAME

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

=head1 AFFILIATION

This Policy is part of the core L<Perl::Critic|Perl::Critic>
distribution.

=head1 DESCRIPTION

The perl builtin I/O function C<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 L<autodie|autodie>, L<Fatal|Fatal>, or
L<Fatal::Exception|Fatal::Exception> to get around
this.  Currently, L<autodie|autodie> is not properly treated as a pragma; its
lexical effects aren't taken into account.

=head1 CONFIGURATION

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

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

=head1 AUTHOR

Andrew Moore <amoore@mooresystems.com>

=head1 ACKNOWLEDGMENTS

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

=head1 COPYRIGHT

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.

=cut

##############################################################################
# Local Variables:
#   mode: cperl
#   cperl-indent-level: 4
#   fill-column: 78
#   indent-tabs-mode: nil
#   c-indentation-style: bsd
# End:
# ex: set ts=8 sts=4 sw=4 tw=78 ft=perl expandtab shiftround :

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ProhibitInteractiveTest.pm	text/plain	1.97 KB	0/0	0644	2025-02-23 11:43:43
ProhibitJoinedReadline.pm	text/plain	3.29 KB	0/0	0644	2025-02-23 11:43:43
ProhibitOneArgSelect.pm	text/plain	2.48 KB	0/0	0644	2025-02-23 11:43:43
ProhibitReadlineInForLoop.pm	text/plain	2.65 KB	0/0	0644	2025-02-23 11:43:43
ProhibitTwoArgOpen.pm	text/plain	3.84 KB	0/0	0644	2025-02-23 11:43:43
RequireBracedFileHandleWithPrint.pm	text/plain	4 KB	0/0	0644	2025-02-23 11:43:43
RequireBriefOpen.pm	text/plain	11.27 KB	0/0	0644	2025-02-23 11:43:43
RequireCheckedClose.pm	text/plain	3.24 KB	0/0	0644	2025-02-23 11:43:43
RequireCheckedOpen.pm	text/plain	3.34 KB	0/0	0644	2025-02-23 11:43:43
RequireCheckedSyscalls.pm	text/plain	6.93 KB	0/0	0644	2025-02-23 11:43:43
RequireEncodingWithUTF8Layer.pm	text/plain	5.3 KB	0/0	0644	2025-02-23 11:43:43