sub SigChildHandler {
    my $self = shift; my $ref = shift;
    return undef if $self->{'mode'} ne 'fork'; # Don't care for childs.
    return 'IGNORE' if $^O eq 'linux'; # We get zombies on Linux otherwise
    my $reaper;
    sub {
        $$ref = wait;
        $SIG{'CHLD'} = $reaper;
    };
}

sub Bind ($) {
    my $self = shift;
    my $fh;
    my $child_pid;

    my $reaper = $self->SigChildHandler(\$child_pid);
    $SIG{'CHLD'} = $reaper if $reaper;
...