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$exitFlag = false;
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if (DIRECTORY_SEPARATOR != '\\') {
    pcntl_signal(SIGTERM, "sig_handler");
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}
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function sig_handler($signo)
{
    global $exitFlag;
    echo "signal handler...\n";
    switch ($signo) {
        case SIGTERM :
        case SIGHUP :
        case SIGINT :
            $exitFlag = true;
            break;
        default :
        // handle all other signals
    }
}
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