stacktrace-on-sighup.php

gistfile1.txt

<?php

declare(strict_types=1);

pcntl_async_signals(true);

pcntl_signal(SIGHUP, function ($signal) {
    echo "HUP! {$signal} \n";
    error_log((new Exception())->getTraceAsString());
});

(new class
{
    function __invoke()
    {
        printf("kill -s HUP %d\n", getmypid());

        while (true) {
            sleep(255);
        }
    }
})();