File Coverage

File:Dpkg/Exit.pm
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1# Copyright © 2002 Adam Heath <doogie@debian.org>
2# Copyright © 2012-2013 Guillem Jover <guillem@debian.org>
3#
4# This program is free software; you can redistribute it and/or modify
5# it under the terms of the GNU General Public License as published by
6# the Free Software Foundation; either version 2 of the License, or
7# (at your option) any later version.
8#
9# This program is distributed in the hope that it will be useful,
10# but WITHOUT ANY WARRANTY; without even the implied warranty of
11# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12# GNU General Public License for more details.
13#
14# You should have received a copy of the GNU General Public License
15# along with this program.  If not, see <https://www.gnu.org/licenses/>.
16
17=encoding utf8
18
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=head1 NAME

Dpkg::Exit - program exit handlers

=head1 DESCRIPTION

The Dpkg::Exit module provides support functions to run handlers on exit.

=cut
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29package Dpkg::Exit 2.00;
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use strict;
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use warnings;
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34our @EXPORT_OK = qw(
35    push_exit_handler
36    pop_exit_handler
37    run_exit_handlers
38);
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use Exporter qw(import);
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42my @handlers = ();
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=head1 FUNCTIONS

=over 4

=item push_exit_handler($func)

Register a code reference into the exit function handlers stack.

=cut
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54sub 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;
59}
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=item pop_exit_handler()

Pop the last registered exit handler from the handlers stack.

=cut
66
67sub pop_exit_handler {
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    _reset_exit_handlers() if @handlers == 1;
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    pop @handlers;
70}
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=item run_exit_handlers()

Run the registered exit handlers.

=cut
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78sub run_exit_handlers {
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    while (my $handler = pop @handlers) {
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        $handler->();
81    }
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    _reset_exit_handlers();
83}
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85sub _exit_handler {
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    run_exit_handlers();
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    exit(127);
88}
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90my @SIGNAMES = qw(INT HUP QUIT);
91my %SIGOLD;
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93sub _setup_exit_handlers
94{
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    foreach my $signame (@SIGNAMES) {
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        $SIGOLD{$signame} = $SIG{$signame};
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        $SIG{$signame} = \&_exit_handler;
98    }
99}
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101sub _reset_exit_handlers
102{
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    foreach my $signame (@SIGNAMES) {
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        $SIG{$signame} = $SIGOLD{$signame};
105    }
106}
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108END {
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    local $?;
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    run_exit_handlers();
111}
112
113=back
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=head1 CHANGES

=head2 Version 2.00 (dpkg 1.20.0)

Hide variable: @handlers.

=head2 Version 1.01 (dpkg 1.17.2)

New functions: push_exit_handler(), pop_exit_handler(), run_exit_handlers()

Deprecated variable: @handlers

=head2 Version 1.00 (dpkg 1.15.6)

Mark the module as public.

=cut
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1331;