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package ops; |
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|
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our $VERSION = '1.00'; |
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|
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use Opcode qw(opmask_add opset invert_opset); |
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|
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sub import { |
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shift; |
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# Not that unimport is the prefered form since import's don't |
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# accumulate well owing to the 'only ever add opmask' rule. |
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# E.g., perl -Mops=:set1 -Mops=:setb is unlikely to do as expected. |
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opmask_add(invert_opset opset(@_)) if @_; |
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} |
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|
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sub unimport { |
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shift; |
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opmask_add(opset(@_)) if @_; |
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} |
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|
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1; |
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|
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__END__ |
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|
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=head1 NAME |
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|
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ops - Perl pragma to restrict unsafe operations when compiling |
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|
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=head1 SYNOPSIS |
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|
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perl -Mops=:default ... # only allow reasonably safe operations |
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|
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perl -M-ops=system ... # disable the 'system' opcode |
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|
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=head1 DESCRIPTION |
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|
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Since the ops pragma currently has an irreversible global effect, it is |
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only of significant practical use with the C<-M> option on the command line. |
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|
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See the L<Opcode> module for information about opcodes, optags, opmasks |
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and important information about safety. |
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|
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=head1 SEE ALSO |
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|
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Opcode(3), Safe(3), perlrun(3) |
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|
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=cut |
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|
