<?php


namespace Symfony\Component\Process;

use Symfony\Component\Process\Exception\InvalidArgumentException;
use Symfony\Component\Process\Exception\LogicException;
use Symfony\Component\Process\Exception\ProcessFailedException;
use Symfony\Component\Process\Exception\ProcessSignaledException;
use Symfony\Component\Process\Exception\ProcessTimedOutException;
use Symfony\Component\Process\Exception\RuntimeException;
use Symfony\Component\Process\Pipes\UnixPipes;
use Symfony\Component\Process\Pipes\WindowsPipes;


class Process implements \IteratorAggregate
{
    public const ERR = 'err';
    public const OUT = 'out';

    public const STATUS_READY = 'ready';
    public const STATUS_STARTED = 'started';
    public const STATUS_TERMINATED = 'terminated';

    public const STDIN = 0;
    public const STDOUT = 1;
    public const STDERR = 2;

    
    public const TIMEOUT_PRECISION = 0.2;

    public const ITER_NON_BLOCKING = 1; 
    public const ITER_KEEP_OUTPUT = 2;  
    public const ITER_SKIP_OUT = 4;     
    public const ITER_SKIP_ERR = 8;     

    private ?\Closure $callback = null;
    private array|string $commandline;
    private ?string $cwd;
    private array $env = [];
    
    private $input;
    private ?float $starttime = null;
    private ?float $lastOutputTime = null;
    private ?float $timeout = null;
    private ?float $idleTimeout = null;
    private ?int $exitcode = null;
    private array $fallbackStatus = [];
    private array $processInformation;
    private bool $outputDisabled = false;
    
    private $stdout;
    
    private $stderr;
    
    private $process;
    private string $status = self::STATUS_READY;
    private int $incrementalOutputOffset = 0;
    private int $incrementalErrorOutputOffset = 0;
    private bool $tty = false;
    private bool $pty;
    private array $options = ['suppress_errors' => true, 'bypass_shell' => true];

    private WindowsPipes|UnixPipes $processPipes;

    private ?int $latestSignal = null;

    private static ?bool $sigchild = null;

    
    public static $exitCodes = [
        0 => 'OK',
        1 => 'General error',
        2 => 'Misuse of shell builtins',

        126 => 'Invoked command cannot execute',
        127 => 'Command not found',
        128 => 'Invalid exit argument',

        
        129 => 'Hangup',
        130 => 'Interrupt',
        131 => 'Quit and dump core',
        132 => 'Illegal instruction',
        133 => 'Trace/breakpoint trap',
        134 => 'Process aborted',
        135 => 'Bus error: "access to undefined portion of memory object"',
        136 => 'Floating point exception: "erroneous arithmetic operation"',
        137 => 'Kill (terminate immediately)',
        138 => 'User-defined 1',
        139 => 'Segmentation violation',
        140 => 'User-defined 2',
        141 => 'Write to pipe with no one reading',
        142 => 'Signal raised by alarm',
        143 => 'Termination (request to terminate)',
        
        145 => 'Child process terminated, stopped (or continued*)',
        146 => 'Continue if stopped',
        147 => 'Stop executing temporarily',
        148 => 'Terminal stop signal',
        149 => 'Background process attempting to read from tty ("in")',
        150 => 'Background process attempting to write to tty ("out")',
        151 => 'Urgent data available on socket',
        152 => 'CPU time limit exceeded',
        153 => 'File size limit exceeded',
        154 => 'Signal raised by timer counting virtual time: "virtual timer expired"',
        155 => 'Profiling timer expired',
        
        157 => 'Pollable event',
        
        159 => 'Bad syscall',
    ];

    
    public function __construct(array $command, ?string $cwd = null, ?array $env = null, mixed $input = null, ?float $timeout = 60)
    {
        if (!\function_exists('proc_open')) {
            throw new LogicException('The Process class relies on proc_open, which is not available on your PHP installation.');
        }

        $this->commandline = $command;
        $this->cwd = $cwd;

        
        if (null === $this->cwd && (\defined('ZEND_THREAD_SAFE') || '\\' === \DIRECTORY_SEPARATOR)) {
            $this->cwd = getcwd();
        }
        if (null !== $env) {
            $this->setEnv($env);
        }

        $this->setInput($input);
        $this->setTimeout($timeout);
        $this->pty = false;
    }

    
    public static function fromShellCommandline(string $command, ?string $cwd = null, ?array $env = null, mixed $input = null, ?float $timeout = 60): static
    {
        $process = new static([], $cwd, $env, $input, $timeout);
        $process->commandline = $command;

        return $process;
    }

    public function __serialize(): array
    {
        throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
    }

    public function __unserialize(array $data): void
    {
        throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
    }

    public function __destruct()
    {
        if ($this->options['create_new_console'] ?? false) {
            $this->processPipes->close();
        } else {
            $this->stop(0);
        }
    }

    public function __clone()
    {
        $this->resetProcessData();
    }

    
    public function run(?callable $callback = null, array $env = []): int
    {
        $this->start($callback, $env);

        return $this->wait();
    }

    
    public function mustRun(?callable $callback = null, array $env = []): static
    {
        if (0 !== $this->run($callback, $env)) {
            throw new ProcessFailedException($this);
        }

        return $this;
    }

    
    public function start(?callable $callback = null, array $env = [])
    {
        if ($this->isRunning()) {
            throw new RuntimeException('Process is already running.');
        }

        $this->resetProcessData();
        $this->starttime = $this->lastOutputTime = microtime(true);
        $this->callback = $this->buildCallback($callback);
        $descriptors = $this->getDescriptors(null !== $callback);

        if ($this->env) {
            $env += '\\' === \DIRECTORY_SEPARATOR ? array_diff_ukey($this->env, $env, 'strcasecmp') : $this->env;
        }

        $env += '\\' === \DIRECTORY_SEPARATOR ? array_diff_ukey($this->getDefaultEnv(), $env, 'strcasecmp') : $this->getDefaultEnv();

        if (\is_array($commandline = $this->commandline)) {
            $commandline = implode(' ', array_map($this->escapeArgument(...), $commandline));

            if ('\\' !== \DIRECTORY_SEPARATOR) {
                
                $commandline = 'exec '.$commandline;
            }
        } else {
            $commandline = $this->replacePlaceholders($commandline, $env);
        }

        if ('\\' === \DIRECTORY_SEPARATOR) {
            $commandline = $this->prepareWindowsCommandLine($commandline, $env);
        } elseif ($this->isSigchildEnabled()) {
            
            $descriptors[3] = ['pipe', 'w'];

            
            $commandline = '{ ('.$commandline.') <&3 3<&- 3>/dev/null & } 3<&0;';
            $commandline .= 'pid=$!; echo $pid >&3; wait $pid 2>/dev/null; code=$?; echo $code >&3; exit $code';
        }

        $envPairs = [];
        foreach ($env as $k => $v) {
            if (!\is_scalar($v ?? '') && !$v instanceof \Stringable) {
                continue;
            }

            if (false !== $v && !\in_array($k = (string) $k, ['', 'argc', 'argv', 'ARGC', 'ARGV'], true) && !str_contains($k, '=') && !str_contains($k, "\0")) {
                $envPairs[] = $k.'='.$v;
            }
        }

        if (!is_dir($this->cwd)) {
            throw new RuntimeException(\sprintf('The provided cwd "%s" does not exist.', $this->cwd));
        }

        $process = @proc_open($commandline, $descriptors, $this->processPipes->pipes, $this->cwd, $envPairs, $this->options);

        if (!$process) {
            throw new RuntimeException('Unable to launch a new process.');
        }
        $this->process = $process;
        $this->status = self::STATUS_STARTED;

        if (isset($descriptors[3])) {
            $this->fallbackStatus['pid'] = (int) fgets($this->processPipes->pipes[3]);
        }

        if ($this->tty) {
            return;
        }

        $this->updateStatus(false);
        $this->checkTimeout();
    }

    
    public function restart(?callable $callback = null, array $env = []): static
    {
        if ($this->isRunning()) {
            throw new RuntimeException('Process is already running.');
        }

        $process = clone $this;
        $process->start($callback, $env);

        return $process;
    }

    
    public function wait(?callable $callback = null): int
    {
        $this->requireProcessIsStarted(__FUNCTION__);

        $this->updateStatus(false);

        if (null !== $callback) {
            if (!$this->processPipes->haveReadSupport()) {
                $this->stop(0);
                throw new LogicException('Pass the callback to the "Process::start" method or call enableOutput to use a callback with "Process::wait".');
            }
            $this->callback = $this->buildCallback($callback);
        }

        do {
            $this->checkTimeout();
            $running = $this->isRunning() && ('\\' === \DIRECTORY_SEPARATOR || $this->processPipes->areOpen());
            $this->readPipes($running, '\\' !== \DIRECTORY_SEPARATOR || !$running);
        } while ($running);

        while ($this->isRunning()) {
            $this->checkTimeout();
            usleep(1000);
        }

        if ($this->processInformation['signaled'] && $this->processInformation['termsig'] !== $this->latestSignal) {
            throw new ProcessSignaledException($this);
        }

        return $this->exitcode;
    }

    
    public function waitUntil(callable $callback): bool
    {
        $this->requireProcessIsStarted(__FUNCTION__);
        $this->updateStatus(false);

        if (!$this->processPipes->haveReadSupport()) {
            $this->stop(0);
            throw new LogicException('Pass the callback to the "Process::start" method or call enableOutput to use a callback with "Process::waitUntil".');
        }
        $callback = $this->buildCallback($callback);

        $ready = false;
        while (true) {
            $this->checkTimeout();
            $running = '\\' === \DIRECTORY_SEPARATOR ? $this->isRunning() : $this->processPipes->areOpen();
            $output = $this->processPipes->readAndWrite($running, '\\' !== \DIRECTORY_SEPARATOR || !$running);

            foreach ($output as $type => $data) {
                if (3 !== $type) {
                    $ready = $callback(self::STDOUT === $type ? self::OUT : self::ERR, $data) || $ready;
                } elseif (!isset($this->fallbackStatus['signaled'])) {
                    $this->fallbackStatus['exitcode'] = (int) $data;
                }
            }
            if ($ready) {
                return true;
            }
            if (!$running) {
                return false;
            }

            usleep(1000);
        }
    }

    
    public function getPid(): ?int
    {
        return $this->isRunning() ? $this->processInformation['pid'] : null;
    }

    
    public function signal(int $signal): static
    {
        $this->doSignal($signal, true);

        return $this;
    }

    
    public function disableOutput(): static
    {
        if ($this->isRunning()) {
            throw new RuntimeException('Disabling output while the process is running is not possible.');
        }
        if (null !== $this->idleTimeout) {
            throw new LogicException('Output cannot be disabled while an idle timeout is set.');
        }

        $this->outputDisabled = true;

        return $this;
    }

    
    public function enableOutput(): static
    {
        if ($this->isRunning()) {
            throw new RuntimeException('Enabling output while the process is running is not possible.');
        }

        $this->outputDisabled = false;

        return $this;
    }

    
    public function isOutputDisabled(): bool
    {
        return $this->outputDisabled;
    }

    
    public function getOutput(): string
    {
        $this->readPipesForOutput(__FUNCTION__);

        if (false === $ret = stream_get_contents($this->stdout, -1, 0)) {
            return '';
        }

        return $ret;
    }

    
    public function getIncrementalOutput(): string
    {
        $this->readPipesForOutput(__FUNCTION__);

        $latest = stream_get_contents($this->stdout, -1, $this->incrementalOutputOffset);
        $this->incrementalOutputOffset = ftell($this->stdout);

        if (false === $latest) {
            return '';
        }

        return $latest;
    }

    
    public function getIterator(int $flags = 0): \Generator
    {
        $this->readPipesForOutput(__FUNCTION__, false);

        $clearOutput = !(self::ITER_KEEP_OUTPUT & $flags);
        $blocking = !(self::ITER_NON_BLOCKING & $flags);
        $yieldOut = !(self::ITER_SKIP_OUT & $flags);
        $yieldErr = !(self::ITER_SKIP_ERR & $flags);

        while (null !== $this->callback || ($yieldOut && !feof($this->stdout)) || ($yieldErr && !feof($this->stderr))) {
            if ($yieldOut) {
                $out = stream_get_contents($this->stdout, -1, $this->incrementalOutputOffset);

                if (isset($out[0])) {
                    if ($clearOutput) {
                        $this->clearOutput();
                    } else {
                        $this->incrementalOutputOffset = ftell($this->stdout);
                    }

                    yield self::OUT => $out;
                }
            }

            if ($yieldErr) {
                $err = stream_get_contents($this->stderr, -1, $this->incrementalErrorOutputOffset);

                if (isset($err[0])) {
                    if ($clearOutput) {
                        $this->clearErrorOutput();
                    } else {
                        $this->incrementalErrorOutputOffset = ftell($this->stderr);
                    }

                    yield self::ERR => $err;
                }
            }

            if (!$blocking && !isset($out[0]) && !isset($err[0])) {
                yield self::OUT => '';
            }

            $this->checkTimeout();
            $this->readPipesForOutput(__FUNCTION__, $blocking);
        }
    }

    
    public function clearOutput(): static
    {
        ftruncate($this->stdout, 0);
        fseek($this->stdout, 0);
        $this->incrementalOutputOffset = 0;

        return $this;
    }

    
    public function getErrorOutput(): string
    {
        $this->readPipesForOutput(__FUNCTION__);

        if (false === $ret = stream_get_contents($this->stderr, -1, 0)) {
            return '';
        }

        return $ret;
    }

    
    public function getIncrementalErrorOutput(): string
    {
        $this->readPipesForOutput(__FUNCTION__);

        $latest = stream_get_contents($this->stderr, -1, $this->incrementalErrorOutputOffset);
        $this->incrementalErrorOutputOffset = ftell($this->stderr);

        if (false === $latest) {
            return '';
        }

        return $latest;
    }

    
    public function clearErrorOutput(): static
    {
        ftruncate($this->stderr, 0);
        fseek($this->stderr, 0);
        $this->incrementalErrorOutputOffset = 0;

        return $this;
    }

    
    public function getExitCode(): ?int
    {
        $this->updateStatus(false);

        return $this->exitcode;
    }

    
    public function getExitCodeText(): ?string
    {
        if (null === $exitcode = $this->getExitCode()) {
            return null;
        }

        return self::$exitCodes[$exitcode] ?? 'Unknown error';
    }

    
    public function isSuccessful(): bool
    {
        return 0 === $this->getExitCode();
    }

    
    public function hasBeenSignaled(): bool
    {
        $this->requireProcessIsTerminated(__FUNCTION__);

        return $this->processInformation['signaled'];
    }

    
    public function getTermSignal(): int
    {
        $this->requireProcessIsTerminated(__FUNCTION__);

        if ($this->isSigchildEnabled() && -1 === $this->processInformation['termsig']) {
            throw new RuntimeException('This PHP has been compiled with --enable-sigchild. Term signal cannot be retrieved.');
        }

        return $this->processInformation['termsig'];
    }

    
    public function hasBeenStopped(): bool
    {
        $this->requireProcessIsTerminated(__FUNCTION__);

        return $this->processInformation['stopped'];
    }

    
    public function getStopSignal(): int
    {
        $this->requireProcessIsTerminated(__FUNCTION__);

        return $this->processInformation['stopsig'];
    }

    
    public function isRunning(): bool
    {
        if (self::STATUS_STARTED !== $this->status) {
            return false;
        }

        $this->updateStatus(false);

        return $this->processInformation['running'];
    }

    
    public function isStarted(): bool
    {
        return self::STATUS_READY != $this->status;
    }

    
    public function isTerminated(): bool
    {
        $this->updateStatus(false);

        return self::STATUS_TERMINATED == $this->status;
    }

    
    public function getStatus(): string
    {
        $this->updateStatus(false);

        return $this->status;
    }

    
    public function stop(float $timeout = 10, ?int $signal = null): ?int
    {
        $timeoutMicro = microtime(true) + $timeout;
        if ($this->isRunning()) {
            
            $this->doSignal(15, false);
            do {
                usleep(1000);
            } while ($this->isRunning() && microtime(true) < $timeoutMicro);

            if ($this->isRunning()) {
                
                
                $this->doSignal($signal ?: 9, false);
            }
        }

        if ($this->isRunning()) {
            if (isset($this->fallbackStatus['pid'])) {
                unset($this->fallbackStatus['pid']);

                return $this->stop(0, $signal);
            }
            $this->close();
        }

        return $this->exitcode;
    }

    
    public function addOutput(string $line): void
    {
        $this->lastOutputTime = microtime(true);

        fseek($this->stdout, 0, \SEEK_END);
        fwrite($this->stdout, $line);
        fseek($this->stdout, $this->incrementalOutputOffset);
    }

    
    public function addErrorOutput(string $line): void
    {
        $this->lastOutputTime = microtime(true);

        fseek($this->stderr, 0, \SEEK_END);
        fwrite($this->stderr, $line);
        fseek($this->stderr, $this->incrementalErrorOutputOffset);
    }

    
    public function getLastOutputTime(): ?float
    {
        return $this->lastOutputTime;
    }

    
    public function getCommandLine(): string
    {
        return \is_array($this->commandline) ? implode(' ', array_map($this->escapeArgument(...), $this->commandline)) : $this->commandline;
    }

    
    public function getTimeout(): ?float
    {
        return $this->timeout;
    }

    
    public function getIdleTimeout(): ?float
    {
        return $this->idleTimeout;
    }

    
    public function setTimeout(?float $timeout): static
    {
        $this->timeout = $this->validateTimeout($timeout);

        return $this;
    }

    
    public function setIdleTimeout(?float $timeout): static
    {
        if (null !== $timeout && $this->outputDisabled) {
            throw new LogicException('Idle timeout cannot be set while the output is disabled.');
        }

        $this->idleTimeout = $this->validateTimeout($timeout);

        return $this;
    }

    
    public function setTty(bool $tty): static
    {
        if ('\\' === \DIRECTORY_SEPARATOR && $tty) {
            throw new RuntimeException('TTY mode is not supported on Windows platform.');
        }

        if ($tty && !self::isTtySupported()) {
            throw new RuntimeException('TTY mode requires /dev/tty to be read/writable.');
        }

        $this->tty = $tty;

        return $this;
    }

    
    public function isTty(): bool
    {
        return $this->tty;
    }

    
    public function setPty(bool $bool): static
    {
        $this->pty = $bool;

        return $this;
    }

    
    public function isPty(): bool
    {
        return $this->pty;
    }

    
    public function getWorkingDirectory(): ?string
    {
        if (null === $this->cwd) {
            
            
            return getcwd() ?: null;
        }

        return $this->cwd;
    }

    
    public function setWorkingDirectory(string $cwd): static
    {
        $this->cwd = $cwd;

        return $this;
    }

    
    public function getEnv(): array
    {
        return $this->env;
    }

    
    public function setEnv(array $env): static
    {
        $this->env = $env;

        return $this;
    }

    
    public function getInput()
    {
        return $this->input;
    }

    
    public function setInput(mixed $input): static
    {
        if ($this->isRunning()) {
            throw new LogicException('Input cannot be set while the process is running.');
        }

        $this->input = ProcessUtils::validateInput(__METHOD__, $input);

        return $this;
    }

    
    public function checkTimeout()
    {
        if (self::STATUS_STARTED !== $this->status) {
            return;
        }

        if (null !== $this->timeout && $this->timeout < microtime(true) - $this->starttime) {
            $this->stop(0);

            throw new ProcessTimedOutException($this, ProcessTimedOutException::TYPE_GENERAL);
        }

        if (null !== $this->idleTimeout && $this->idleTimeout < microtime(true) - $this->lastOutputTime) {
            $this->stop(0);

            throw new ProcessTimedOutException($this, ProcessTimedOutException::TYPE_IDLE);
        }
    }

    
    public function getStartTime(): float
    {
        if (!$this->isStarted()) {
            throw new LogicException('Start time is only available after process start.');
        }

        return $this->starttime;
    }

    
    public function setOptions(array $options)
    {
        if ($this->isRunning()) {
            throw new RuntimeException('Setting options while the process is running is not possible.');
        }

        $defaultOptions = $this->options;
        $existingOptions = ['blocking_pipes', 'create_process_group', 'create_new_console'];

        foreach ($options as $key => $value) {
            if (!\in_array($key, $existingOptions)) {
                $this->options = $defaultOptions;
                throw new LogicException(\sprintf('Invalid option "%s" passed to "%s()". Supported options are "%s".', $key, __METHOD__, implode('", "', $existingOptions)));
            }
            $this->options[$key] = $value;
        }
    }

    
    public static function isTtySupported(): bool
    {
        static $isTtySupported;

        return $isTtySupported ??= ('/' === \DIRECTORY_SEPARATOR && stream_isatty(\STDOUT) && @is_writable('/dev/tty'));
    }

    
    public static function isPtySupported(): bool
    {
        static $result;

        if (null !== $result) {
            return $result;
        }

        if ('\\' === \DIRECTORY_SEPARATOR) {
            return $result = false;
        }

        return $result = (bool) @proc_open('echo 1 >/dev/null', [['pty'], ['pty'], ['pty']], $pipes);
    }

    
    private function getDescriptors(bool $hasCallback): array
    {
        if ($this->input instanceof \Iterator) {
            $this->input->rewind();
        }
        if ('\\' === \DIRECTORY_SEPARATOR) {
            $this->processPipes = new WindowsPipes($this->input, !$this->outputDisabled || $hasCallback);
        } else {
            $this->processPipes = new UnixPipes($this->isTty(), $this->isPty(), $this->input, !$this->outputDisabled || $hasCallback);
        }

        return $this->processPipes->getDescriptors();
    }

    
    protected function buildCallback(?callable $callback = null): \Closure
    {
        if ($this->outputDisabled) {
            return static fn ($type, $data): bool => null !== $callback && $callback($type, $data);
        }

        $out = self::OUT;

        return function ($type, $data) use ($callback, $out): bool {
            if ($out == $type) {
                $this->addOutput($data);
            } else {
                $this->addErrorOutput($data);
            }

            return null !== $callback && $callback($type, $data);
        };
    }

    
    protected function updateStatus(bool $blocking)
    {
        if (self::STATUS_STARTED !== $this->status) {
            return;
        }

        if ($this->processInformation['running'] ?? true) {
            $this->processInformation = proc_get_status($this->process);
        }
        $running = $this->processInformation['running'];

        $this->readPipes($running && $blocking, '\\' !== \DIRECTORY_SEPARATOR || !$running);

        if ($this->fallbackStatus && $this->isSigchildEnabled()) {
            $this->processInformation = $this->fallbackStatus + $this->processInformation;
        }

        if (!$running) {
            $this->close();
        }
    }

    
    protected function isSigchildEnabled(): bool
    {
        if (null !== self::$sigchild) {
            return self::$sigchild;
        }

        if (!\function_exists('phpinfo')) {
            return self::$sigchild = false;
        }

        ob_start();
        phpinfo(\INFO_GENERAL);

        return self::$sigchild = str_contains(ob_get_clean(), '--enable-sigchild');
    }

    
    private function readPipesForOutput(string $caller, bool $blocking = false): void
    {
        if ($this->outputDisabled) {
            throw new LogicException('Output has been disabled.');
        }

        $this->requireProcessIsStarted($caller);

        $this->updateStatus($blocking);
    }

    
    private function validateTimeout(?float $timeout): ?float
    {
        $timeout = (float) $timeout;

        if (0.0 === $timeout) {
            $timeout = null;
        } elseif ($timeout < 0) {
            throw new InvalidArgumentException('The timeout value must be a valid positive integer or float number.');
        }

        return $timeout;
    }

    
    private function readPipes(bool $blocking, bool $close): void
    {
        $result = $this->processPipes->readAndWrite($blocking, $close);

        $callback = $this->callback;
        foreach ($result as $type => $data) {
            if (3 !== $type) {
                $callback(self::STDOUT === $type ? self::OUT : self::ERR, $data);
            } elseif (!isset($this->fallbackStatus['signaled'])) {
                $this->fallbackStatus['exitcode'] = (int) $data;
            }
        }
    }

    
    private function close(): int
    {
        $this->processPipes->close();
        if ($this->process) {
            proc_close($this->process);
            $this->process = null;
        }
        $this->exitcode = $this->processInformation['exitcode'];
        $this->status = self::STATUS_TERMINATED;

        if (-1 === $this->exitcode) {
            if ($this->processInformation['signaled'] && 0 < $this->processInformation['termsig']) {
                
                $this->exitcode = 128 + $this->processInformation['termsig'];
            } elseif ($this->isSigchildEnabled()) {
                $this->processInformation['signaled'] = true;
                $this->processInformation['termsig'] = -1;
            }
        }

        
        $this->callback = null;

        return $this->exitcode;
    }

    
    private function resetProcessData(): void
    {
        $this->starttime = null;
        $this->callback = null;
        $this->exitcode = null;
        $this->fallbackStatus = [];
        $this->processInformation = [];
        $this->stdout = fopen('php://temp/maxmemory:'.(1024 * 1024), 'w+');
        $this->stderr = fopen('php://temp/maxmemory:'.(1024 * 1024), 'w+');
        $this->process = null;
        $this->latestSignal = null;
        $this->status = self::STATUS_READY;
        $this->incrementalOutputOffset = 0;
        $this->incrementalErrorOutputOffset = 0;
    }

    
    private function doSignal(int $signal, bool $throwException): bool
    {
        if (null === $pid = $this->getPid()) {
            if ($throwException) {
                throw new LogicException('Cannot send signal on a non running process.');
            }

            return false;
        }

        if ('\\' === \DIRECTORY_SEPARATOR) {
            exec(\sprintf('taskkill /F /T /PID %d 2>&1', $pid), $output, $exitCode);
            if ($exitCode && $this->isRunning()) {
                if ($throwException) {
                    throw new RuntimeException(\sprintf('Unable to kill the process (%s).', implode(' ', $output)));
                }

                return false;
            }
        } else {
            if (!$this->isSigchildEnabled()) {
                $ok = @proc_terminate($this->process, $signal);
            } elseif (\function_exists('posix_kill')) {
                $ok = @posix_kill($pid, $signal);
            } elseif ($ok = proc_open(\sprintf('kill -%d %d', $signal, $pid), [2 => ['pipe', 'w']], $pipes)) {
                $ok = false === fgets($pipes[2]);
            }
            if (!$ok) {
                if ($throwException) {
                    throw new RuntimeException(\sprintf('Error while sending signal "%s".', $signal));
                }

                return false;
            }
        }

        $this->latestSignal = $signal;
        $this->fallbackStatus['signaled'] = true;
        $this->fallbackStatus['exitcode'] = -1;
        $this->fallbackStatus['termsig'] = $this->latestSignal;

        return true;
    }

    private function prepareWindowsCommandLine(string $cmd, array &$env): string
    {
        $uid = uniqid('', true);
        $cmd = preg_replace_callback(
            '/"(?:(
                [^"%!^]*+
                (?:
                    (?: !LF! | "(?:\^[%!^])?+" )
                    [^"%!^]*+
                )++
            ) | [^"]*+ )"/x',
            static function ($m) use (&$env, $uid) {
                static $varCount = 0;
                static $varCache = [];
                if (!isset($m[1])) {
                    return $m[0];
                }
                if (isset($varCache[$m[0]])) {
                    return $varCache[$m[0]];
                }
                if (str_contains($value = $m[1], "\0")) {
                    $value = str_replace("\0", '?', $value);
                }
                if (false === strpbrk($value, "\"%!\n")) {
                    return '"'.$value.'"';
                }

                $value = str_replace(['!LF!', '"^!"', '"^%"', '"^^"', '""'], ["\n", '!', '%', '^', '"'], $value);
                $value = '"'.preg_replace('/(\\\\*)"/', '$1$1\\"', $value).'"';
                $var = $uid.++$varCount;

                $env[$var] = $value;

                return $varCache[$m[0]] = '!'.$var.'!';
            },
            $cmd
        );

        static $comSpec;

        if (!$comSpec && $comSpec = (new ExecutableFinder())->find('cmd.exe')) {
            
            $comSpec = '"'.preg_replace('{(\\\\*+)"}', '$1$1\"', $comSpec).'"';
        }

        $cmd = ($comSpec ?? 'cmd').' /V:ON /E:ON /D /C ('.str_replace("\n", ' ', $cmd).')';
        foreach ($this->processPipes->getFiles() as $offset => $filename) {
            $cmd .= ' '.$offset.'>"'.$filename.'"';
        }

        return $cmd;
    }

    
    private function requireProcessIsStarted(string $functionName): void
    {
        if (!$this->isStarted()) {
            throw new LogicException(\sprintf('Process must be started before calling "%s()".', $functionName));
        }
    }

    
    private function requireProcessIsTerminated(string $functionName): void
    {
        if (!$this->isTerminated()) {
            throw new LogicException(\sprintf('Process must be terminated before calling "%s()".', $functionName));
        }
    }

    
    private function escapeArgument(?string $argument): string
    {
        if ('' === $argument || null === $argument) {
            return '""';
        }
        if ('\\' !== \DIRECTORY_SEPARATOR) {
            return "'".str_replace("'", "'\\''", $argument)."'";
        }
        if (str_contains($argument, "\0")) {
            $argument = str_replace("\0", '?', $argument);
        }
        if (!preg_match('/[()%!^"<>&|\s[\]=;*?\'$]/', $argument)) {
            return $argument;
        }
        $argument = preg_replace('/(\\\\+)$/', '$1$1', $argument);

        return '"'.str_replace(['"', '^', '%', '!', "\n"], ['""', '"^^"', '"^%"', '"^!"', '!LF!'], $argument).'"';
    }

    private function replacePlaceholders(string $commandline, array $env): string
    {
        return preg_replace_callback('/"\$\{:([_a-zA-Z]++[_a-zA-Z0-9]*+)\}"/', function ($matches) use ($commandline, $env) {
            if (!isset($env[$matches[1]]) || false === $env[$matches[1]]) {
                throw new InvalidArgumentException(\sprintf('Command line is missing a value for parameter "%s": ', $matches[1]).$commandline);
            }

            return $this->escapeArgument($env[$matches[1]]);
        }, $commandline);
    }

    private function getDefaultEnv(): array
    {
        $env = getenv();
        $env = ('\\' === \DIRECTORY_SEPARATOR ? array_intersect_ukey($env, $_SERVER, 'strcasecmp') : array_intersect_key($env, $_SERVER)) ?: $env;
        $env = $_ENV + ('\\' === \DIRECTORY_SEPARATOR ? array_diff_ukey($env, $_ENV, 'strcasecmp') : $env);

        if (\in_array(\PHP_SAPI, ['cli', 'phpdbg', 'embed'], true)) {
            return $env;
        }

        
        foreach ($env as $k => $v) {
            if (str_starts_with($k, 'HTTP_')
                || str_starts_with($k, 'ORIG_')
                || str_starts_with($k, 'REDIRECT_')
                || \in_array($k, [
                    'AUTH_TYPE', 'CONTENT_LENGTH', 'CONTENT_TYPE', 'DOCUMENT_ROOT',
                    'DOCUMENT_URI', 'GATEWAY_INTERFACE', 'HTTPS', 'PATH_INFO',
                    'PATH_TRANSLATED', 'PHP_AUTH_DIGEST', 'PHP_AUTH_PW', 'PHP_AUTH_USER',
                    'PHP_SELF', 'QUERY_STRING', 'REMOTE_ADDR', 'REMOTE_HOST',
                    'REMOTE_IDENT', 'REMOTE_PORT', 'REMOTE_USER', 'REQUEST_METHOD',
                    'REQUEST_SCHEME', 'REQUEST_TIME', 'REQUEST_TIME_FLOAT', 'REQUEST_URI',
                    'SCRIPT_FILENAME', 'SCRIPT_NAME', 'SCRIPT_URI', 'SCRIPT_URL',
                    'SERVER_ADDR', 'SERVER_ADMIN', 'SERVER_NAME', 'SERVER_PORT',
                    'SERVER_PROTOCOL', 'SERVER_SIGNATURE', 'SERVER_SOFTWARE',
                ], true)
            ) {
                unset($env[$k]);
            }
        }

        return $env;
    }
}