133 lines
2.4 KiB
Perl
133 lines
2.4 KiB
Perl
# Copyright © 2002 Adam Heath <doogie@debian.org>
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# Copyright © 2012-2013 Guillem Jover <guillem@debian.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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=encoding utf8
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=head1 NAME
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Dpkg::Exit - program exit handlers
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=head1 DESCRIPTION
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The Dpkg::Exit module provides support functions to run handlers on exit.
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=cut
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package Dpkg::Exit 2.00;
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use strict;
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use warnings;
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our @EXPORT_OK = qw(
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push_exit_handler
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pop_exit_handler
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run_exit_handlers
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);
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use Exporter qw(import);
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my @handlers = ();
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=head1 FUNCTIONS
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=over 4
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=item push_exit_handler($func)
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Register a code reference into the exit function handlers stack.
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=cut
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sub push_exit_handler {
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my ($func) = shift;
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_setup_exit_handlers() if @handlers == 0;
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push @handlers, $func;
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}
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=item pop_exit_handler()
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Pop the last registered exit handler from the handlers stack.
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=cut
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sub pop_exit_handler {
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_reset_exit_handlers() if @handlers == 1;
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pop @handlers;
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}
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=item run_exit_handlers()
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Run the registered exit handlers.
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=cut
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sub run_exit_handlers {
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while (my $handler = pop @handlers) {
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$handler->();
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}
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_reset_exit_handlers();
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}
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sub _exit_handler {
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run_exit_handlers();
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exit(127);
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}
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my @SIGNAMES = qw(INT HUP QUIT);
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my %SIGOLD;
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sub _setup_exit_handlers
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{
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foreach my $signame (@SIGNAMES) {
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$SIGOLD{$signame} = $SIG{$signame};
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$SIG{$signame} = \&_exit_handler;
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}
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}
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sub _reset_exit_handlers
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{
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foreach my $signame (@SIGNAMES) {
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$SIG{$signame} = $SIGOLD{$signame};
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}
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}
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END {
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local $?;
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run_exit_handlers();
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}
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=back
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=head1 CHANGES
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=head2 Version 2.00 (dpkg 1.20.0)
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Hide variable: @handlers.
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=head2 Version 1.01 (dpkg 1.17.2)
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New functions: push_exit_handler(), pop_exit_handler(), run_exit_handlers()
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Deprecated variable: @handlers
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=head2 Version 1.00 (dpkg 1.15.6)
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Mark the module as public.
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=cut
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1;
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