pcntl_signal_get_handler

Supported Versions: PHP 7 >= 7.1.0, PHP 8
Get the current handler for specified signal
pcntl_signal_get_handler(int $signal): callable|int
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        $windowsHandler = null;

        if ($handleInterruptsUnix) {

            pcntl_async_signals(true);

            $prevHandler = pcntl_signal_get_handler(SIGINT);

            pcntl_signal(SIGINT, function ($sig) use ($runCleanup, $prevHandler, $io) {

                $io->writeError('Received SIGINT, aborting', true, IOInterface::DEBUG);

                $runCleanup();
src/Composer/Installer/InstallationManager.php