1#! /usr/bin/perl 2# ex:ts=8 sw=4: 3# $OpenBSD: Wrapper.pm,v 1.1 2019/07/09 13:49:47 espie Exp $ 4# 5# Copyright (c) 2010 Marc Espie <espie@openbsd.org> 6# 7# Permission to use, copy, modify, and distribute this software for any 8# purpose with or without fee is hereby granted, provided that the above 9# copyright notice and this permission notice appear in all copies. 10# 11# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 19use strict; 20use warnings; 21 22# injection fault wrapper 23package Wrapper; 24require Exporter; 25our @ISA = qw(Exporter); 26our @EXPORT = qw(wrap); 27 28sub wrap 29{ 30 my ($name, $sub) = @_; 31 my $typeglob = caller()."::$name"; 32 my $original; 33 { 34 no strict qw(refs); 35 $original = *$typeglob{CODE}; 36 } 37 my $imposter = sub { 38 return &$sub($original, @_); 39 }; 40 41 { 42 no strict qw(refs); 43 no warnings qw(redefine); 44 *{$typeglob} = $imposter; 45 } 46} 471; 48