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