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Directory >> /var/www/html/back/vendor/psy/psysh/src/ExecutionLoop/

File / Folder	Size	Action
.	-
AbstractListener.php	0.995KB	edt ren
ExecutionLoggingListene...	0.887KB	edt ren
InputLoggingListener.php	0.867KB	edt ren
Listener.php	1.872KB	edt ren
ProcessForker.php	13.969KB	edt ren
RunkitReloader.php	3.797KB	edt ren
SignalHandler.php	3.725KB	edt ren
UopzReloader.php	8.67KB	edt ren
UopzReloaderVisitor.php	21.401KB	edt ren

<?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;
    private ?string $originalStty = null;

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);
    }

/**
     * Save original stty state before the REPL starts.
     */
    public function beforeRun(Shell $shell)
    {
        if (@\posix_isatty(\STDIN)) {
            $this->originalStty = @\shell_exec('stty -g 2>/dev/null');
        }
    }

/**
     * 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;
        }
    }

/**
     * Restore original terminal state when the REPL exits.
     */
    public function afterRun(Shell $shell, int $exitCode = 0)
    {
        if ($this->originalStty !== null) {
            @\shell_exec('stty '.\escapeshellarg(\trim($this->originalStty)).' 2>/dev/null');
        }
    }
}

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