Viewing file:  SignalHandler.php (3.97 KB) -rw-r--r--
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<?php declare(strict_types=1);
/*
* This file is part of the Monolog package.
*
* (c) Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Monolog;
use Psr\Log\LoggerInterface;
use Psr\Log\LogLevel;
use ReflectionExtension;
/**
* Monolog POSIX signal handler
*
* @author Robert Gust-Bardon <robert@gust-bardon.org>
*
* @phpstan-import-type Level from \Monolog\Logger
* @phpstan-import-type LevelName from \Monolog\Logger
*/
class SignalHandler
{
/** @var LoggerInterface */
private $logger;
/** @var array<int, callable|string|int> SIG_DFL, SIG_IGN or previous callable */
private $previousSignalHandler = [];
/** @var array<int, int> */
private $signalLevelMap = [];
/** @var array<int, bool> */
private $signalRestartSyscalls = [];
public function __construct(LoggerInterface $logger)
{
$this->logger = $logger;
}
/**
* @param int|string $level Level or level name
* @param bool $callPrevious
* @param bool $restartSyscalls
* @param bool|null $async
* @return $this
*
* @phpstan-param Level|LevelName|LogLevel::* $level
*/
public function registerSignalHandler(int $signo, $level = LogLevel::CRITICAL, bool $callPrevious = true, bool $restartSyscalls = true, ?bool $async = true): self
{
if (!extension_loaded('pcntl') || !function_exists('pcntl_signal')) {
return $this;
}
$level = Logger::toMonologLevel($level);
if ($callPrevious) {
$handler = pcntl_signal_get_handler($signo);
$this->previousSignalHandler[$signo] = $handler;
} else {
unset($this->previousSignalHandler[$signo]);
}
$this->signalLevelMap[$signo] = $level;
$this->signalRestartSyscalls[$signo] = $restartSyscalls;
if ($async !== null) {
pcntl_async_signals($async);
}
pcntl_signal($signo, [$this, 'handleSignal'], $restartSyscalls);
return $this;
}
/**
* @param mixed $siginfo
*/
public function handleSignal(int $signo, $siginfo = null): void
{
static $signals = [];
if (!$signals && extension_loaded('pcntl')) {
$pcntl = new ReflectionExtension('pcntl');
// HHVM 3.24.2 returns an empty array.
foreach ($pcntl->getConstants() ?: get_defined_constants(true)['Core'] as $name => $value) {
if (substr($name, 0, 3) === 'SIG' && $name[3] !== '_' && is_int($value)) {
$signals[$value] = $name;
}
}
}
$level = $this->signalLevelMap[$signo] ?? LogLevel::CRITICAL;
$signal = $signals[$signo] ?? $signo;
$context = $siginfo ?? [];
$this->logger->log($level, sprintf('Program received signal %s', $signal), $context);
if (!isset($this->previousSignalHandler[$signo])) {
return;
}
if ($this->previousSignalHandler[$signo] === SIG_DFL) {
if (extension_loaded('pcntl') && function_exists('pcntl_signal') && function_exists('pcntl_sigprocmask') && function_exists('pcntl_signal_dispatch')
&& extension_loaded('posix') && function_exists('posix_getpid') && function_exists('posix_kill')
) {
$restartSyscalls = $this->signalRestartSyscalls[$signo] ?? true;
pcntl_signal($signo, SIG_DFL, $restartSyscalls);
pcntl_sigprocmask(SIG_UNBLOCK, [$signo], $oldset);
posix_kill(posix_getpid(), $signo);
pcntl_signal_dispatch();
pcntl_sigprocmask(SIG_SETMASK, $oldset);
pcntl_signal($signo, [$this, 'handleSignal'], $restartSyscalls);
}
} elseif (is_callable($this->previousSignalHandler[$signo])) {
$this->previousSignalHandler[$signo]($signo, $siginfo);
}
}
}
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