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<?php /* * This file is part of Psy Shell. * * (c) 2012-2025 Justin Hileman * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Psy\ExecutionLoop; use Psy\Exception\InterruptException; use Psy\Shell; use Psy\Util\DependencyChecker; /** * A signal handler for interrupting execution with Ctrl-C, used when process forking is disabled. */ class SignalHandler extends AbstractListener { private bool $sigintHandlerInstalled = false; private bool $restoreStty = false; private bool $wasInterrupted = false; public const PCNTL_FUNCTIONS = [ 'pcntl_signal', 'pcntl_async_signals', ]; public const POSIX_FUNCTIONS = [ 'posix_isatty', ]; /** * Signal handler is supported if pcntl and posix extensions are available. */ public static function isSupported(): bool { return DependencyChecker::functionsAvailable(self::PCNTL_FUNCTIONS) && DependencyChecker::functionsAvailable(self::POSIX_FUNCTIONS); } /** * Install SIGINT handler before executing user code. */ public function onExecute(Shell $shell, string $code) { $this->wasInterrupted = false; // Ensure signal processing is enabled so Ctrl-C can interrupt execution if (@\posix_isatty(\STDIN)) { @\shell_exec('stty isig 2>/dev/null'); $this->restoreStty = true; } \pcntl_async_signals(true); // Install SIGINT handler that throws exception during execution $interrupted = &$this->wasInterrupted; $this->sigintHandlerInstalled = \pcntl_signal(\SIGINT, function () use (&$interrupted) { $interrupted = true; throw new InterruptException('Ctrl+C'); }); return null; } /** * Called at the end of each loop. * * Restores terminal state and clears stdin if execution was interrupted. */ public function afterLoop(Shell $shell) { // Restore default SIGINT handler after execution if ($this->sigintHandlerInstalled) { \pcntl_signal(\SIGINT, \SIG_DFL); $this->sigintHandlerInstalled = false; } // Restore terminal to raw mode after execution // This prevents Ctrl-C at the prompt from generating SIGINT if ($this->restoreStty) { @\shell_exec('stty -isig 2>/dev/null'); $this->restoreStty = false; } // Clear any pending input from the interrupted stdin stream // The SIGINT may have left the stream in a bad state if ($this->wasInterrupted && \defined('STDIN') && \is_resource(\STDIN)) { // Check if the stream is still usable $meta = @\stream_get_meta_data(\STDIN); if ($meta && !($meta['eof'] ?? false)) { // Drain any buffered input, suppressing I/O errors @\stream_set_blocking(\STDIN, false); while (@\fgetc(\STDIN) !== false) { } @\stream_set_blocking(\STDIN, true); } $this->wasInterrupted = false; } } }