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- package ops;
-
- use Opcode qw(opmask_add opset invert_opset);
-
- sub import {
- shift;
- # Not that unimport is the prefered form since import's don't
- # accumulate well owing to the 'only ever add opmask' rule.
- # E.g., perl -Mops=:set1 -Mops=:setb is unlikely to do as expected.
- opmask_add(invert_opset opset(@_)) if @_;
- }
-
- sub unimport {
- shift;
- opmask_add(opset(@_)) if @_;
- }
-
- 1;
-
- __END__
-
- =head1 NAME
-
- ops - Perl pragma to restrict unsafe operations when compiling
-
- =head1 SYNOPSIS
-
- perl -Mops=:default ... # only allow reasonably safe operations
-
- perl -M-ops=system ... # disable the 'system' opcode
-
- =head1 DESCRIPTION
-
- Since the ops pragma currently has an irreversible global effect, it is
- only of significant practical use with the C<-M> option on the command line.
-
- See the L<Opcode> module for information about opcodes, optags, opmasks
- and important information about safety.
-
- =head1 SEE ALSO
-
- Opcode(3), Safe(3), perlrun(3)
-
- =cut
-
-