#!/usr/bin/perl
use warnings FATAL => qw( all );
use strict;

use Test::More tests => 1;
use POSIX qw( _exit );

sub wrap_sigs {
        my $signals = shift;
        my $coderef = shift;

        my $died;
        my %old_sighandlers;
        eval {
                for my $sig (keys %$signals) {
                        $old_sighandlers{$sig} = ($SIG{$sig} || 'DEFAULT');
                        $SIG{$sig} =  sub {
                            for my $sig (keys %old_sighandlers) {
                                $SIG{$sig} = $old_sighandlers{$sig};
                            }
                            die ('SIG' . $sig . "\n");
                        };
                }

                $died = 1 unless eval { $coderef->(); 1 };

                for my $sig (keys %old_sighandlers) {
                        $SIG{$sig} = $old_sighandlers{$sig};
                }
        };

        return $died;
}

my $pid = fork;
if ($pid) {
        $SIG{ALRM} = sub { };
        my $timeout = time + 5;
        diag('parent entering wrap_sigs loop');
        while (time < $timeout) {
                wrap_sigs(
                        { ALRM => 1 },
                        sub { }
                );
        }
        diag('parent survived, killing child');
        kill TERM => $pid;
} else {
        sleep 1;
        diag('child starting signal storm');
        1 while kill ALRM => getppid;
        _exit(0);
}
ok(1, 'survived signal storm');

##</code><code>##

#!/usr/bin/perl
use warnings FATAL => qw( all );
use strict;

use Test::More tests => 1;
use POSIX qw( _exit );

$|=1;

sub wrap_sigs {
        my $signals = shift;
        my $coderef = shift;

        my $died;
        my %old_sighandlers;
        eval {
                print "entering eval\n";
                for my $sig (keys %$signals) {
                        $old_sighandlers{$sig} = ($SIG{$sig} || 'DEFAULT');
                        $SIG{$sig} =  sub {
                            print "caught signal with inner handler\n";
                            for my $sig (keys %old_sighandlers) {
                                $SIG{$sig} = $old_sighandlers{$sig};
                            }
                            die ('SIG' . $sig . "\n");
                        };
                }

                $died = 1 unless eval {
                    print "entering inner eval\n";
                    $coderef->();
                    print "leaving inner eval\n";
                    1
                };

                for my $sig (keys %old_sighandlers) {
                        $SIG{$sig} = $old_sighandlers{$sig};
                }
                print "leaving eval\n";
        };

        return $died;
}

my $pid = fork;
if ($pid) {
        $SIG{ALRM} = sub { print "caught signal with outer handler\n"; };
        my $timeout = time + 5;
        diag('parent entering wrap_sigs loop');
        while (time < $timeout) {
                wrap_sigs(
                        { ALRM => 1 },
                        sub { }
                );
        }
        diag('parent survived, killing child');
        kill TERM => $pid;
} else {
        sleep 1;
        $|=1;
        diag('child starting signal storm');
        print "killing...\n" while kill ALRM => getppid;
        _exit(0);
}
ok(1, 'survived signal storm');