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package Devel::NoGlobalSig; |
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$VERSION = v0.0.1; |
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use warnings; |
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use strict; |
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use Carp; |
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=head1 NAME |
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Devel::NoGlobalSig - croak when a global %SIG is installed |
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=head1 SYNOPSIS |
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This is a diagnostic tool for detecting where some code has over-written |
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a singnal handler (in the global %SIG) without using local(). |
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perl -MDevel::NoGlobalSig=die your_program |
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=head1 ABOUT |
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The installation of global signal handlers by some distant code can be |
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rather surprising. This gives you a way to detect where this happened |
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by installing an exploding subroutine in the handler slot. |
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This is a diagnostic tool. It is not recommended to employ this in |
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production code (but if you find a good reason to do that, please drop |
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me a note.) |
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=head1 USAGE |
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Typically, you will simply want to import this from the command line, |
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e.g. when running some test which is mysteriously failing after |
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integrating two pieces of previously working code. |
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perl -MDevel::NoGlobalSig=die t/never_failed_before.t |
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If your frontend code installs its own global handler for good reason, |
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you'll want to import this after that happens (your handler will be |
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wrapped in a protective exploding shell.) |
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BEGIN {$SIG{__DIE__} = \&my_die_handler}; |
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use Devel::NoGlobalSig qw(die warn hup); |
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=head2 Signal Names |
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The arguments to import() may be a list of upper-case or lower-case |
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versions of the handler names. The special signals __WARN__ and __DIE__ |
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may be passed as simply 'warn' and 'die', respectively. |
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See L for details. |
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=cut |
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use overload '&{}' => sub { shift->{'sub'} }, fallback => 1; |
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sub import { |
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1388
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my $package = shift; |
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my (@args) = @_; |
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@args or return; # XXX croak? |
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foreach my $name (@args) { |
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$name = '__' . $name . '__' if($name eq 'warn' or $name eq 'die'); |
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$name = uc($name); |
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my $self = { |
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name => $name, |
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'sub'=> $SIG{$name} || sub {}, |
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}; |
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$SIG{$name} = bless($self, $package); |
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} |
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} |
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my $ended = 0; END {$ended = 1}; |
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sub DESTROY { |
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1641
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return if($ended); |
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3
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my $self = shift; |
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80
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3
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Carp::carp("BZZT: non-localized \$SIG{$self->{name}} assignment"); |
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3
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exit(1); |
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} |
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84
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85
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=head1 AUTHOR |
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87
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Eric Wilhelm @ |
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http://scratchcomputing.com/ |
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91
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=head1 BUGS |
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93
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If you found this module on CPAN, please report any bugs or feature |
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requests through the web interface at L. I will be |
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notified, and then you'll automatically be notified of progress on your |
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bug as I make changes. |
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98
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If you pulled this development version from my /svn/, please contact me |
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directly. |
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101
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=head1 COPYRIGHT |
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103
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Copyright (C) 2009 Eric L. Wilhelm, All Rights Reserved. |
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105
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=head1 NO WARRANTY |
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107
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Absolutely, positively NO WARRANTY, neither express or implied, is |
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offered with this software. You use this software at your own risk. In |
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case of loss, no person or entity owes you anything whatsoever. You |
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have been warned. |
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112
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=head1 LICENSE |
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114
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This program is free software; you can redistribute it and/or modify it |
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under the same terms as Perl itself. |
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117
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=cut |
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# vi:ts=2:sw=2:et:sta |
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1; |