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  1. or download this
    use POSIX 'setsid';
use Cwd 'chdir';

sub daemon_init {
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        my $pid = fork;
    exit 0 if $pid;
    exit 1 if not defined $pid;
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        setsid();
    $pid = fork;
    exit 0 if $pid;
    exit 1 if not defined $pid;
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        chdir '/' or die $!;
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        umask 0;
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        close $_ for @_;
}