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author | Siep Kroonenberg <siepo@cybercomm.nl> | 2011-02-17 16:52:23 +0000 |
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committer | Siep Kroonenberg <siepo@cybercomm.nl> | 2011-02-17 16:52:23 +0000 |
commit | 8da2d23733595367fad869e5fbc6c9a87041879b (patch) | |
tree | 0f3719f4eea97f872b6347c6d9ff5aa2ccd38299 /Master/tlpkg/tlperl/lib/ops.pm | |
parent | 9d55a4cf517a832c74e85179eac4239f9be8d2e7 (diff) |
New tlperl part VIII
git-svn-id: svn://tug.org/texlive/trunk@21430 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Master/tlpkg/tlperl/lib/ops.pm')
-rw-r--r-- | Master/tlpkg/tlperl/lib/ops.pm | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/Master/tlpkg/tlperl/lib/ops.pm b/Master/tlpkg/tlperl/lib/ops.pm new file mode 100644 index 00000000000..4183669eb16 --- /dev/null +++ b/Master/tlpkg/tlperl/lib/ops.pm @@ -0,0 +1,47 @@ +package ops; + +our $VERSION = '1.02'; + +use Opcode qw(opmask_add opset invert_opset); + +sub import { + shift; + # Not that unimport is the preferred 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 C<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 + +L<Opcode>, L<Safe>, L<perlrun> + +=cut + |