Signal Handler

A simple cross-platform¹ signal handler.

¹ It does not actually work on windows as the pcntl extension is not available, but it will silently fail to work so you can use it without caring for windows, and you can use signal names as strings to avoid undefined constant errors on windows. So it is a best-effort cross-platform that does not get in your way.

Usage

Default usage, listen to SIGTERM, SIGINT (i.e. Ctrl+C / ^C interrupts)

use Seld\Signal\SignalHandler;

$signal = SignalHandler::create();

while (true) {
    // do some work here ...

    // exit gracefully at the end of an iteration if the process interruption was called for
    if ($signal->isTriggered()) {
        break;
    }
}

Listen to custom signals and reset the handler to handle the same signal multiple times

use Seld\Signal\SignalHandler;

// using strings for the constant names makes sure it will work on Windows and
// OSX even if the signal is missing on those platforms
$signal = SignalHandler::create([SignalHandler::SIGHUP, SignalHandler::SIGUSR1]);

while (true) {
    // do some work here ...

    // reload the config when the signal was triggered
    if ($signal->isTriggered()) {
        $this->reloadConfiguration();

        // reset the handler so next time you check isTriggered() it
        // will be false, until SIGHUP/SIGUSR1 is signaled again
        $signal->reset();
    }
}

Passing in a PSR-3 Logger will make it log ->info('Received '.$signalName)

use Seld\Signal\SignalHandler;

$signal = SignalHandler::create(null, new PSR3Logger());

Passing in a callback you can react to the signal as well

use Seld\Signal\SignalHandler;

$signal = SignalHandler::create([SignalHandler::SIGINT], function ($signal, $signalName) {
    echo 'Received ' . $signalName . PHP_EOL;
});

Installation

For a quick install with Composer use:

$ composer require seld/signal-handler

Requirements

• PHP 5.4+

Submitting bugs and feature requests

Bugs and feature request are tracked on GitHub

Author

Jordi Boggiano - [email protected] - http://twitter.com/seldaek

License

signal-handler is licensed under the MIT License - see the LICENSE file for details