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<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. / 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\PipesInterface; use Symfony\Component\Process\Pipes\UnixPipes; use Symfony\Component\Process\Pipes\WindowsPipes; /* * Process is a thin wrapper around proc_* functions to easily * start independent PHP processes. * * @author Fabien Potencier <fabien@symfony.com> * @author Romain Neutron <imprec@gmail.com> / 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; // Timeout Precision in seconds. public const TIMEOUT_PRECISION = 0.2; public const ITER_NON_BLOCKING = 1; // By default, iterating over outputs is a blocking call, use this flag to make it non-blocking public const ITER_KEEP_OUTPUT = 2; // By default, outputs are cleared while iterating, use this flag to keep them in memory public const ITER_SKIP_OUT = 4; // Use this flag to skip STDOUT while iterating public const ITER_SKIP_ERR = 8; // Use this flag to skip STDERR while iterating private $callback; private $hasCallback = false; private $commandline; private $cwd; private $env; private $input; private $starttime; private $lastOutputTime; private $timeout; private $idleTimeout; private $exitcode; private $fallbackStatus = []; private $processInformation; private $outputDisabled = false; private $stdout; private $stderr; private $process; private $status = self::STATUS_READY; private $incrementalOutputOffset = 0; private $incrementalErrorOutputOffset = 0; private $tty = false; private $pty; private $useFileHandles = false; /* @var PipesInterface / private $processPipes; private $latestSignal; private static $sigchild; /* * Exit codes translation table. * * User-defined errors must use exit codes in the 64-113 range. / 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', // signals 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)', // 144 - not defined 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', // 156 - not defined 157 => 'Pollable event', // 158 - not defined 159 => 'Bad syscall', ]; /** * @param array $command The command to run and its arguments listed as separate entries * @param string\|null $cwd The working directory or null to use the working dir of the current PHP process * @param array\|null $env The environment variables or null to use the same environment as the current PHP process * @param mixed $input The input as stream resource, scalar or \Traversable, or null for no input * @param int\|float\|null $timeout The timeout in seconds or null to disable * * @throws LogicException When proc_open is not installed / public function __construct($command, string $cwd = null, array $env = null, $input = null, ?float $timeout = 60) { if (!\function_exists('proc_open')) { throw new LogicException('The Process class relies on proc_open, which is not available on your PHP installation.'); } if (!\is_array($command)) { @trigger_error(sprintf('Passing a command as string when creating a "%s" instance is deprecated since Symfony 4.2, pass it as an array of its arguments instead, or use the "Process::fromShellCommandline()" constructor if you need features provided by the shell.', __CLASS__), \E_USER_DEPRECATED); } $this->commandline = $command; $this->cwd = $cwd; // on Windows, if the cwd changed via chdir(), proc_open defaults to the dir where PHP was started // on Gnu/Linux, PHP builds with --enable-maintainer-zts are also affected // @see : https://bugs.php.net/51800 // @see : https://bugs.php.net/50524 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->useFileHandles = '\\' === \DIRECTORY_SEPARATOR; $this->pty = false; } /* * Creates a Process instance as a command-line to be run in a shell wrapper. * * Command-lines are parsed by the shell of your OS (/bin/sh on Unix-like, cmd.exe on Windows.) * This allows using e.g. pipes or conditional execution. In this mode, signals are sent to the * shell wrapper and not to your commands. * * In order to inject dynamic values into command-lines, we strongly recommend using placeholders. * This will save escaping values, which is not portable nor secure anyway: * * $process = Process::fromShellCommandline('my_command "$MY_VAR"'); * $process->run(null, ['MY_VAR' => $theValue]); * * @param string $command The command line to pass to the shell of the OS * @param string\|null $cwd The working directory or null to use the working dir of the current PHP process * @param array\|null $env The environment variables or null to use the same environment as the current PHP process * @param mixed $input The input as stream resource, scalar or \Traversable, or null for no input * @param int\|float\|null $timeout The timeout in seconds or null to disable * * @return static * * @throws LogicException When proc_open is not installed / public static function fromShellCommandline(string $command, string $cwd = null, array $env = null, $input = null, ?float $timeout = 60) { $process = new static([], $cwd, $env, $input, $timeout); $process->commandline = $command; return $process; } public function __sleep() { throw new \BadMethodCallException('Cannot serialize '.__CLASS__); } public function __wakeup() { throw new \BadMethodCallException('Cannot unserialize '.__CLASS__); } public function __destruct() { $this->stop(0); } public function __clone() { $this->resetProcessData(); } /* * Runs the process. * * The callback receives the type of output (out or err) and * some bytes from the output in real-time. It allows to have feedback * from the independent process during execution. * * The STDOUT and STDERR are also available after the process is finished * via the getOutput() and getErrorOutput() methods. * * @param callable\|null $callback A PHP callback to run whenever there is some * output available on STDOUT or STDERR * * @return int The exit status code * * @throws RuntimeException When process can't be launched * @throws RuntimeException When process is already running * @throws ProcessTimedOutException When process timed out * @throws ProcessSignaledException When process stopped after receiving signal * @throws LogicException In case a callback is provided and output has been disabled * * @final / public function run(callable $callback = null, array $env = []): int { $this->start($callback, $env); return $this->wait(); } /* * Runs the process. * * This is identical to run() except that an exception is thrown if the process * exits with a non-zero exit code. * * @return $this * * @throws ProcessFailedException if the process didn't terminate successfully * * @final / public function mustRun(callable $callback = null, array $env = []): self { if (0 !== $this->run($callback, $env)) { throw new ProcessFailedException($this); } return $this; } /* * Starts the process and returns after writing the input to STDIN. * * This method blocks until all STDIN data is sent to the process then it * returns while the process runs in the background. * * The termination of the process can be awaited with wait(). * * The callback receives the type of output (out or err) and some bytes from * the output in real-time while writing the standard input to the process. * It allows to have feedback from the independent process during execution. * * @param callable\|null $callback A PHP callback to run whenever there is some * output available on STDOUT or STDERR * * @throws RuntimeException When process can't be launched * @throws RuntimeException When process is already running * @throws LogicException In case a callback is provided and output has been disabled / 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); $this->hasCallback = null !== $callback; $descriptors = $this->getDescriptors(); if ($this->env) { $env += $this->env; } $env += $this->getDefaultEnv(); if (\is_array($commandline = $this->commandline)) { $commandline = implode(' ', array_map([$this, 'escapeArgument'], $commandline)); if ('\\' !== \DIRECTORY_SEPARATOR) { // exec is mandatory to deal with sending a signal to the process $commandline = 'exec '.$commandline; } } else { $commandline = $this->replacePlaceholders($commandline, $env); } $options = ['suppress_errors' => true]; if ('\\' === \DIRECTORY_SEPARATOR) { $options['bypass_shell'] = true; $commandline = $this->prepareWindowsCommandLine($commandline, $env); } elseif (!$this->useFileHandles && $this->isSigchildEnabled()) { // last exit code is output on the fourth pipe and caught to work around --enable-sigchild $descriptors[3] = ['pipe', 'w']; // See https://unix.stackexchange.com/questions/71205/background-process-pipe-input $commandline = '{ ('.$commandline.') <&3 3<&- 3>/dev/null & } 3<&0;'; $commandline .= 'pid=$!; echo $pid >&3; wait $pid; code=$?; echo $code >&3; exit $code'; // Workaround for the bug, when PTS functionality is enabled. // @see : https://bugs.php.net/69442 $ptsWorkaround = fopen(__FILE__, 'r'); } $envPairs = []; foreach ($env as $k => $v) { if (false !== $v) { $envPairs[] = $k.'='.$v; } } if (!is_dir($this->cwd)) { throw new RuntimeException(sprintf('The provided cwd "%s" does not exist.', $this->cwd)); } $this->process = @proc_open($commandline, $descriptors, $this->processPipes->pipes, $this->cwd, $envPairs, $options); if (!\is_resource($this->process)) { throw new RuntimeException('Unable to launch a new 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(); } /* * Restarts the process. * * Be warned that the process is cloned before being started. * * @param callable\|null $callback A PHP callback to run whenever there is some * output available on STDOUT or STDERR * * @return static * * @throws RuntimeException When process can't be launched * @throws RuntimeException When process is already running * * @see start() * * @final / public function restart(callable $callback = null, array $env = []): self { if ($this->isRunning()) { throw new RuntimeException('Process is already running.'); } $process = clone $this; $process->start($callback, $env); return $process; } /* * Waits for the process to terminate. * * The callback receives the type of output (out or err) and some bytes * from the output in real-time while writing the standard input to the process. * It allows to have feedback from the independent process during execution. * * @param callable\|null $callback A valid PHP callback * * @return int The exitcode of the process * * @throws ProcessTimedOutException When process timed out * @throws ProcessSignaledException When process stopped after receiving signal * @throws LogicException When process is not yet started / public function wait(callable $callback = null) { $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 = '\\' === \DIRECTORY_SEPARATOR ? $this->isRunning() : $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; } /* * Waits until the callback returns true. * * The callback receives the type of output (out or err) and some bytes * from the output in real-time while writing the standard input to the process. * It allows to have feedback from the independent process during execution. * * @throws RuntimeException When process timed out * @throws LogicException When process is not yet started * @throws ProcessTimedOutException In case the timeout was reached / 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); } } /* * Returns the Pid (process identifier), if applicable. * * @return int\|null The process id if running, null otherwise / public function getPid() { return $this->isRunning() ? $this->processInformation['pid'] : null; } /* * Sends a POSIX signal to the process. * * @param int $signal A valid POSIX signal (see https://php.net/pcntl.constants) * * @return $this * * @throws LogicException In case the process is not running * @throws RuntimeException In case --enable-sigchild is activated and the process can't be killed * @throws RuntimeException In case of failure / public function signal($signal) { $this->doSignal($signal, true); return $this; } /* * Disables fetching output and error output from the underlying process. * * @return $this * * @throws RuntimeException In case the process is already running * @throws LogicException if an idle timeout is set / public function disableOutput() { if ($this->isRunning()) { throw new RuntimeException('Disabling output while the process is running is not possible.'); } if (null !== $this->idleTimeout) { throw new LogicException('Output can not be disabled while an idle timeout is set.'); } $this->outputDisabled = true; return $this; } /* * Enables fetching output and error output from the underlying process. * * @return $this * * @throws RuntimeException In case the process is already running / public function enableOutput() { if ($this->isRunning()) { throw new RuntimeException('Enabling output while the process is running is not possible.'); } $this->outputDisabled = false; return $this; } /* * Returns true in case the output is disabled, false otherwise. * * @return bool / public function isOutputDisabled() { return $this->outputDisabled; } /* * Returns the current output of the process (STDOUT). * * @return string The process output * * @throws LogicException in case the output has been disabled * @throws LogicException In case the process is not started / public function getOutput() { $this->readPipesForOutput(__FUNCTION__); if (false === $ret = stream_get_contents($this->stdout, -1, 0)) { return ''; } return $ret; } /* * Returns the output incrementally. * * In comparison with the getOutput method which always return the whole * output, this one returns the new output since the last call. * * @return string The process output since the last call * * @throws LogicException in case the output has been disabled * @throws LogicException In case the process is not started / public function getIncrementalOutput() { $this->readPipesForOutput(__FUNCTION__); $latest = stream_get_contents($this->stdout, -1, $this->incrementalOutputOffset); $this->incrementalOutputOffset = ftell($this->stdout); if (false === $latest) { return ''; } return $latest; } /* * Returns an iterator to the output of the process, with the output type as keys (Process::OUT/ERR). * * @param int $flags A bit field of Process::ITER_* flags * * @throws LogicException in case the output has been disabled * @throws LogicException In case the process is not started * * @return \Generator / public function getIterator($flags = 0) { $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); } } /* * Clears the process output. * * @return $this / public function clearOutput() { ftruncate($this->stdout, 0); fseek($this->stdout, 0); $this->incrementalOutputOffset = 0; return $this; } /* * Returns the current error output of the process (STDERR). * * @return string The process error output * * @throws LogicException in case the output has been disabled * @throws LogicException In case the process is not started / public function getErrorOutput() { $this->readPipesForOutput(__FUNCTION__); if (false === $ret = stream_get_contents($this->stderr, -1, 0)) { return ''; } return $ret; } /* * Returns the errorOutput incrementally. * * In comparison with the getErrorOutput method which always return the * whole error output, this one returns the new error output since the last * call. * * @return string The process error output since the last call * * @throws LogicException in case the output has been disabled * @throws LogicException In case the process is not started / public function getIncrementalErrorOutput() { $this->readPipesForOutput(__FUNCTION__); $latest = stream_get_contents($this->stderr, -1, $this->incrementalErrorOutputOffset); $this->incrementalErrorOutputOffset = ftell($this->stderr); if (false === $latest) { return ''; } return $latest; } /* * Clears the process output. * * @return $this / public function clearErrorOutput() { ftruncate($this->stderr, 0); fseek($this->stderr, 0); $this->incrementalErrorOutputOffset = 0; return $this; } /* * Returns the exit code returned by the process. * * @return int\|null The exit status code, null if the Process is not terminated / public function getExitCode() { $this->updateStatus(false); return $this->exitcode; } /* * Returns a string representation for the exit code returned by the process. * * This method relies on the Unix exit code status standardization * and might not be relevant for other operating systems. * * @return string\|null A string representation for the exit status code, null if the Process is not terminated * * @see http://tldp.org/LDP/abs/html/exitcodes.html * @see http://en.wikipedia.org/wiki/Unix_signal / public function getExitCodeText() { if (null === $exitcode = $this->getExitCode()) { return null; } return self::$exitCodes[$exitcode] ?? 'Unknown error'; } /* * Checks if the process ended successfully. * * @return bool true if the process ended successfully, false otherwise / public function isSuccessful() { return 0 === $this->getExitCode(); } /* * Returns true if the child process has been terminated by an uncaught signal. * * It always returns false on Windows. * * @return bool * * @throws LogicException In case the process is not terminated / public function hasBeenSignaled() { $this->requireProcessIsTerminated(__FUNCTION__); return $this->processInformation['signaled']; } /* * Returns the number of the signal that caused the child process to terminate its execution. * * It is only meaningful if hasBeenSignaled() returns true. * * @return int * * @throws RuntimeException In case --enable-sigchild is activated * @throws LogicException In case the process is not terminated / public function getTermSignal() { $this->requireProcessIsTerminated(__FUNCTION__); if ($this->isSigchildEnabled() && -1 === $this->processInformation['termsig']) { throw new RuntimeException('This PHP has been compiled with --enable-sigchild. Term signal can not be retrieved.'); } return $this->processInformation['termsig']; } /* * Returns true if the child process has been stopped by a signal. * * It always returns false on Windows. * * @return bool * * @throws LogicException In case the process is not terminated / public function hasBeenStopped() { $this->requireProcessIsTerminated(__FUNCTION__); return $this->processInformation['stopped']; } /* * Returns the number of the signal that caused the child process to stop its execution. * * It is only meaningful if hasBeenStopped() returns true. * * @return int * * @throws LogicException In case the process is not terminated / public function getStopSignal() { $this->requireProcessIsTerminated(__FUNCTION__); return $this->processInformation['stopsig']; } /* * Checks if the process is currently running. * * @return bool true if the process is currently running, false otherwise / public function isRunning() { if (self::STATUS_STARTED !== $this->status) { return false; } $this->updateStatus(false); return $this->processInformation['running']; } /* * Checks if the process has been started with no regard to the current state. * * @return bool true if status is ready, false otherwise / public function isStarted() { return self::STATUS_READY != $this->status; } /* * Checks if the process is terminated. * * @return bool true if process is terminated, false otherwise / public function isTerminated() { $this->updateStatus(false); return self::STATUS_TERMINATED == $this->status; } /* * Gets the process status. * * The status is one of: ready, started, terminated. * * @return string The current process status / public function getStatus() { $this->updateStatus(false); return $this->status; } /* * Stops the process. * * @param int\|float $timeout The timeout in seconds * @param int $signal A POSIX signal to send in case the process has not stop at timeout, default is SIGKILL (9) * * @return int\|null The exit-code of the process or null if it's not running / public function stop($timeout = 10, $signal = null) { $timeoutMicro = microtime(true) + $timeout; if ($this->isRunning()) { // given SIGTERM may not be defined and that "proc_terminate" uses the constant value and not the constant itself, we use the same here $this->doSignal(15, false); do { usleep(1000); } while ($this->isRunning() && microtime(true) < $timeoutMicro); if ($this->isRunning()) { // Avoid exception here: process is supposed to be running, but it might have stopped just // after this line. In any case, let's silently discard the error, we cannot do anything. $this->doSignal($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; } /* * Adds a line to the STDOUT stream. * * @internal / public function addOutput(string $line) { $this->lastOutputTime = microtime(true); fseek($this->stdout, 0, \SEEK_END); fwrite($this->stdout, $line); fseek($this->stdout, $this->incrementalOutputOffset); } /* * Adds a line to the STDERR stream. * * @internal / public function addErrorOutput(string $line) { $this->lastOutputTime = microtime(true); fseek($this->stderr, 0, \SEEK_END); fwrite($this->stderr, $line); fseek($this->stderr, $this->incrementalErrorOutputOffset); } /* * Gets the last output time in seconds. * * @return float\|null The last output time in seconds or null if it isn't started / public function getLastOutputTime(): ?float { return $this->lastOutputTime; } /* * Gets the command line to be executed. * * @return string The command to execute / public function getCommandLine() { return \is_array($this->commandline) ? implode(' ', array_map([$this, 'escapeArgument'], $this->commandline)) : $this->commandline; } /* * Sets the command line to be executed. * * @param string\|array $commandline The command to execute * * @return $this * * @deprecated since Symfony 4.2. / public function setCommandLine($commandline) { @trigger_error(sprintf('The "%s()" method is deprecated since Symfony 4.2.', __METHOD__), \E_USER_DEPRECATED); $this->commandline = $commandline; return $this; } /* * Gets the process timeout (max. runtime). * * @return float\|null The timeout in seconds or null if it's disabled / public function getTimeout() { return $this->timeout; } /* * Gets the process idle timeout (max. time since last output). * * @return float\|null The timeout in seconds or null if it's disabled / public function getIdleTimeout() { return $this->idleTimeout; } /* * Sets the process timeout (max. runtime) in seconds. * * To disable the timeout, set this value to null. * * @param int\|float\|null $timeout The timeout in seconds * * @return $this * * @throws InvalidArgumentException if the timeout is negative / public function setTimeout($timeout) { $this->timeout = $this->validateTimeout($timeout); return $this; } /* * Sets the process idle timeout (max. time since last output). * * To disable the timeout, set this value to null. * * @param int\|float\|null $timeout The timeout in seconds * * @return $this * * @throws LogicException if the output is disabled * @throws InvalidArgumentException if the timeout is negative / public function setIdleTimeout($timeout) { if (null !== $timeout && $this->outputDisabled) { throw new LogicException('Idle timeout can not be set while the output is disabled.'); } $this->idleTimeout = $this->validateTimeout($timeout); return $this; } /* * Enables or disables the TTY mode. * * @param bool $tty True to enabled and false to disable * * @return $this * * @throws RuntimeException In case the TTY mode is not supported / public function setTty($tty) { 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 = (bool) $tty; return $this; } /* * Checks if the TTY mode is enabled. * * @return bool true if the TTY mode is enabled, false otherwise / public function isTty() { return $this->tty; } /* * Sets PTY mode. * * @param bool $bool * * @return $this / public function setPty($bool) { $this->pty = (bool) $bool; return $this; } /* * Returns PTY state. * * @return bool / public function isPty() { return $this->pty; } /* * Gets the working directory. * * @return string\|null The current working directory or null on failure / public function getWorkingDirectory() { if (null === $this->cwd) { // getcwd() will return false if any one of the parent directories does not have // the readable or search mode set, even if the current directory does return getcwd() ?: null; } return $this->cwd; } /* * Sets the current working directory. * * @param string $cwd The new working directory * * @return $this / public function setWorkingDirectory($cwd) { $this->cwd = $cwd; return $this; } /* * Gets the environment variables. * * @return array The current environment variables / public function getEnv() { return $this->env; } /* * Sets the environment variables. * * Each environment variable value should be a string. * If it is an array, the variable is ignored. * If it is false or null, it will be removed when * env vars are otherwise inherited. * * That happens in PHP when 'argv' is registered into * the $_ENV array for instance. * * @param array $env The new environment variables * * @return $this / public function setEnv(array $env) { // Process can not handle env values that are arrays $env = array_filter($env, function ($value) { return !\is_array($value); }); $this->env = $env; return $this; } /* * Gets the Process input. * * @return resource\|string\|\Iterator\|null The Process input / public function getInput() { return $this->input; } /* * Sets the input. * * This content will be passed to the underlying process standard input. * * @param string\|int\|float\|bool\|resource\|\Traversable\|null $input The content * * @return $this * * @throws LogicException In case the process is running / public function setInput($input) { if ($this->isRunning()) { throw new LogicException('Input can not be set while the process is running.'); } $this->input = ProcessUtils::validateInput(__METHOD__, $input); return $this; } /* * Sets whether environment variables will be inherited or not. * * @param bool $inheritEnv * * @return $this * * @deprecated since Symfony 4.4, env variables are always inherited / public function inheritEnvironmentVariables($inheritEnv = true) { @trigger_error(sprintf('The "%s()" method is deprecated since Symfony 4.4, env variables are always inherited.', __METHOD__), \E_USER_DEPRECATED); if (!$inheritEnv) { throw new InvalidArgumentException('Not inheriting environment variables is not supported.'); } return $this; } /* * Performs a check between the timeout definition and the time the process started. * * In case you run a background process (with the start method), you should * trigger this method regularly to ensure the process timeout * * @throws ProcessTimedOutException In case the timeout was reached / 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); } } /* * Returns whether TTY is supported on the current operating system. / public static function isTtySupported(): bool { static $isTtySupported; if (null === $isTtySupported) { $isTtySupported = (bool) @proc_open('echo 1 >/dev/null', [['file', '/dev/tty', 'r'], ['file', '/dev/tty', 'w'], ['file', '/dev/tty', 'w']], $pipes); } return $isTtySupported; } /* * Returns whether PTY is supported on the current operating system. * * @return bool / public static function isPtySupported() { 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']], $pipes); } /* * Creates the descriptors needed by the proc_open. / private function getDescriptors(): array { if ($this->input instanceof \Iterator) { $this->input->rewind(); } if ('\\' === \DIRECTORY_SEPARATOR) { $this->processPipes = new WindowsPipes($this->input, !$this->outputDisabled \|\| $this->hasCallback); } else { $this->processPipes = new UnixPipes($this->isTty(), $this->isPty(), $this->input, !$this->outputDisabled \|\| $this->hasCallback); } return $this->processPipes->getDescriptors(); } /* * Builds up the callback used by wait(). * * The callbacks adds all occurred output to the specific buffer and calls * the user callback (if present) with the received output. * * @param callable\|null $callback The user defined PHP callback * * @return \Closure A PHP closure / protected function buildCallback(callable $callback = null) { if ($this->outputDisabled) { return function ($type, $data) use ($callback): bool { return 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); }; } /* * Updates the status of the process, reads pipes. * * @param bool $blocking Whether to use a blocking read call / protected function updateStatus($blocking) { if (self::STATUS_STARTED !== $this->status) { return; } $this->processInformation = proc_get_status($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) { $this->close(); } } /* * Returns whether PHP has been compiled with the '--enable-sigchild' option or not. * * @return bool / protected function isSigchildEnabled() { if (null !== self::$sigchild) { return self::$sigchild; } if (!\function_exists('phpinfo')) { return self::$sigchild = false; } ob_start(); phpinfo(\INFO_GENERAL); return self::$sigchild = false !== strpos(ob_get_clean(), '--enable-sigchild'); } /* * Reads pipes for the freshest output. * * @param string $caller The name of the method that needs fresh outputs * @param bool $blocking Whether to use blocking calls or not * * @throws LogicException in case output has been disabled or process is not started / private function readPipesForOutput(string $caller, bool $blocking = false) { if ($this->outputDisabled) { throw new LogicException('Output has been disabled.'); } $this->requireProcessIsStarted($caller); $this->updateStatus($blocking); } /* * Validates and returns the filtered timeout. * * @throws InvalidArgumentException if the given timeout is a negative number / 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; } /* * Reads pipes, executes callback. * * @param bool $blocking Whether to use blocking calls or not * @param bool $close Whether to close file handles or not / private function readPipes(bool $blocking, bool $close) { $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; } } } /* * Closes process resource, closes file handles, sets the exitcode. * * @return int The exitcode / private function close(): int { $this->processPipes->close(); if (\is_resource($this->process)) { proc_close($this->process); } $this->exitcode = $this->processInformation['exitcode']; $this->status = self::STATUS_TERMINATED; if (-1 === $this->exitcode) { if ($this->processInformation['signaled'] && 0 < $this->processInformation['termsig']) { // if process has been signaled, no exitcode but a valid termsig, apply Unix convention $this->exitcode = 128 + $this->processInformation['termsig']; } elseif ($this->isSigchildEnabled()) { $this->processInformation['signaled'] = true; $this->processInformation['termsig'] = -1; } } // Free memory from self-reference callback created by buildCallback // Doing so in other contexts like __destruct or by garbage collector is ineffective // Now pipes are closed, so the callback is no longer necessary $this->callback = null; return $this->exitcode; } /* * Resets data related to the latest run of the process. / private function resetProcessData() { $this->starttime = null; $this->callback = null; $this->exitcode = null; $this->fallbackStatus = []; $this->processInformation = null; $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; } /** * Sends a POSIX signal to the process. * * @param int $signal A valid POSIX signal (see https://php.net/pcntl.constants) * @param bool $throwException Whether to throw exception in case signal failed * * @return bool True if the signal was sent successfully, false otherwise * * @throws LogicException In case the process is not running * @throws RuntimeException In case --enable-sigchild is activated and the process can't be killed * @throws RuntimeException In case of failure / private function doSignal(int $signal, bool $throwException): bool { if (null === $pid = $this->getPid()) { if ($throwException) { throw new LogicException('Can not 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); $varCount = 0; $varCache = []; $cmd = preg_replace_callback( '/"(?:( [^"%!^]+ (?: (?: !LF! \| "(?:\^[%!^])?+" ) [^"%!^]+ )++ ) \| [^"]+ )"/x', function ($m) use (&$env, &$varCache, &$varCount, $uid) { if (!isset($m[1])) { return $m[0]; } if (isset($varCache[$m[0]])) { return $varCache[$m[0]]; } if (false !== strpos($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 ); $cmd = 'cmd /V:ON /E:ON /D /C ('.str_replace("\n", ' ', $cmd).')'; foreach ($this->processPipes->getFiles() as $offset => $filename) { $cmd .= ' '.$offset.'>"'.$filename.'"'; } return $cmd; } /* * Ensures the process is running or terminated, throws a LogicException if the process has a not started. * * @throws LogicException if the process has not run / private function requireProcessIsStarted(string $functionName) { if (!$this->isStarted()) { throw new LogicException(sprintf('Process must be started before calling "%s()".', $functionName)); } } /* * Ensures the process is terminated, throws a LogicException if the process has a status different than "terminated". * * @throws LogicException if the process is not yet terminated / private function requireProcessIsTerminated(string $functionName) { if (!$this->isTerminated()) { throw new LogicException(sprintf('Process must be terminated before calling "%s()".', $functionName)); } } /* * Escapes a string to be used as a shell argument. / private function escapeArgument(?string $argument): string { if ('' === $argument \|\| null === $argument) { return '""'; } if ('\\' !== \DIRECTORY_SEPARATOR) { return "'".str_replace("'", "'\\''", $argument)."'"; } if (false !== strpos($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 $env) { return preg_replace_callback('/"\$\{:([_a-zA-Z]++[_a-zA-Z0-9]+)\}"/', function ($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 { $env = []; foreach ($_SERVER as $k => $v) { if (\is_string($v) && false !== $v = getenv($k)) { $env[$k] = $v; } } foreach ($_ENV as $k => $v) { if (\is_string($v)) { $env[$k] = $v; } } return $env; } } Back

Edit File : Process.php | Size : 52.17 KB

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

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\PipesInterface;
use Symfony\Component\Process\Pipes\UnixPipes;
use Symfony\Component\Process\Pipes\WindowsPipes;

/**
 * Process is a thin wrapper around proc_* functions to easily
 * start independent PHP processes.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 * @author Romain Neutron <imprec@gmail.com>
 */
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;

// Timeout Precision in seconds.
    public const TIMEOUT_PRECISION = 0.2;

public const ITER_NON_BLOCKING = 1; // By default, iterating over outputs is a blocking call, use this flag to make it non-blocking
    public const ITER_KEEP_OUTPUT = 2;  // By default, outputs are cleared while iterating, use this flag to keep them in memory
    public const ITER_SKIP_OUT = 4;     // Use this flag to skip STDOUT while iterating
    public const ITER_SKIP_ERR = 8;     // Use this flag to skip STDERR while iterating

private $callback;
    private $hasCallback = false;
    private $commandline;
    private $cwd;
    private $env;
    private $input;
    private $starttime;
    private $lastOutputTime;
    private $timeout;
    private $idleTimeout;
    private $exitcode;
    private $fallbackStatus = [];
    private $processInformation;
    private $outputDisabled = false;
    private $stdout;
    private $stderr;
    private $process;
    private $status = self::STATUS_READY;
    private $incrementalOutputOffset = 0;
    private $incrementalErrorOutputOffset = 0;
    private $tty = false;
    private $pty;

private $useFileHandles = false;
    /** @var PipesInterface */
    private $processPipes;

private $latestSignal;

private static $sigchild;

/**
     * Exit codes translation table.
     *
     * User-defined errors must use exit codes in the 64-113 range.
     */
    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',

// signals
        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)',
        // 144 - not defined
        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',
        // 156 - not defined
        157 => 'Pollable event',
        // 158 - not defined
        159 => 'Bad syscall',
    ];

/**
     * @param array          $command The command to run and its arguments listed as separate entries
     * @param string|null    $cwd     The working directory or null to use the working dir of the current PHP process
     * @param array|null     $env     The environment variables or null to use the same environment as the current PHP process
     * @param mixed          $input   The input as stream resource, scalar or \Traversable, or null for no input
     * @param int|float|null $timeout The timeout in seconds or null to disable
     *
     * @throws LogicException When proc_open is not installed
     */
    public function __construct($command, string $cwd = null, array $env = null, $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.');
        }

if (!\is_array($command)) {
            @trigger_error(sprintf('Passing a command as string when creating a "%s" instance is deprecated since Symfony 4.2, pass it as an array of its arguments instead, or use the "Process::fromShellCommandline()" constructor if you need features provided by the shell.', __CLASS__), \E_USER_DEPRECATED);
        }

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

// on Windows, if the cwd changed via chdir(), proc_open defaults to the dir where PHP was started
        // on Gnu/Linux, PHP builds with --enable-maintainer-zts are also affected
        // @see : https://bugs.php.net/51800
        // @see : https://bugs.php.net/50524
        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->useFileHandles = '\\' === \DIRECTORY_SEPARATOR;
        $this->pty = false;
    }

/**
     * Creates a Process instance as a command-line to be run in a shell wrapper.
     *
     * Command-lines are parsed by the shell of your OS (/bin/sh on Unix-like, cmd.exe on Windows.)
     * This allows using e.g. pipes or conditional execution. In this mode, signals are sent to the
     * shell wrapper and not to your commands.
     *
     * In order to inject dynamic values into command-lines, we strongly recommend using placeholders.
     * This will save escaping values, which is not portable nor secure anyway:
     *
     *   $process = Process::fromShellCommandline('my_command "$MY_VAR"');
     *   $process->run(null, ['MY_VAR' => $theValue]);
     *
     * @param string         $command The command line to pass to the shell of the OS
     * @param string|null    $cwd     The working directory or null to use the working dir of the current PHP process
     * @param array|null     $env     The environment variables or null to use the same environment as the current PHP process
     * @param mixed          $input   The input as stream resource, scalar or \Traversable, or null for no input
     * @param int|float|null $timeout The timeout in seconds or null to disable
     *
     * @return static
     *
     * @throws LogicException When proc_open is not installed
     */
    public static function fromShellCommandline(string $command, string $cwd = null, array $env = null, $input = null, ?float $timeout = 60)
    {
        $process = new static([], $cwd, $env, $input, $timeout);
        $process->commandline = $command;

return $process;
    }

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

public function __wakeup()
    {
        throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
    }

public function __destruct()
    {
        $this->stop(0);
    }

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

/**
     * Runs the process.
     *
     * The callback receives the type of output (out or err) and
     * some bytes from the output in real-time. It allows to have feedback
     * from the independent process during execution.
     *
     * The STDOUT and STDERR are also available after the process is finished
     * via the getOutput() and getErrorOutput() methods.
     *
     * @param callable|null $callback A PHP callback to run whenever there is some
     *                                output available on STDOUT or STDERR
     *
     * @return int The exit status code
     *
     * @throws RuntimeException         When process can't be launched
     * @throws RuntimeException         When process is already running
     * @throws ProcessTimedOutException When process timed out
     * @throws ProcessSignaledException When process stopped after receiving signal
     * @throws LogicException           In case a callback is provided and output has been disabled
     *
     * @final
     */
    public function run(callable $callback = null, array $env = []): int
    {
        $this->start($callback, $env);

return $this->wait();
    }

/**
     * Runs the process.
     *
     * This is identical to run() except that an exception is thrown if the process
     * exits with a non-zero exit code.
     *
     * @return $this
     *
     * @throws ProcessFailedException if the process didn't terminate successfully
     *
     * @final
     */
    public function mustRun(callable $callback = null, array $env = []): self
    {
        if (0 !== $this->run($callback, $env)) {
            throw new ProcessFailedException($this);
        }

return $this;
    }

/**
     * Starts the process and returns after writing the input to STDIN.
     *
     * This method blocks until all STDIN data is sent to the process then it
     * returns while the process runs in the background.
     *
     * The termination of the process can be awaited with wait().
     *
     * The callback receives the type of output (out or err) and some bytes from
     * the output in real-time while writing the standard input to the process.
     * It allows to have feedback from the independent process during execution.
     *
     * @param callable|null $callback A PHP callback to run whenever there is some
     *                                output available on STDOUT or STDERR
     *
     * @throws RuntimeException When process can't be launched
     * @throws RuntimeException When process is already running
     * @throws LogicException   In case a callback is provided and output has been disabled
     */
    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);
        $this->hasCallback = null !== $callback;
        $descriptors = $this->getDescriptors();

if ($this->env) {
            $env += $this->env;
        }

$env += $this->getDefaultEnv();

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

if ('\\' !== \DIRECTORY_SEPARATOR) {
                // exec is mandatory to deal with sending a signal to the process
                $commandline = 'exec '.$commandline;
            }
        } else {
            $commandline = $this->replacePlaceholders($commandline, $env);
        }

$options = ['suppress_errors' => true];

if ('\\' === \DIRECTORY_SEPARATOR) {
            $options['bypass_shell'] = true;
            $commandline = $this->prepareWindowsCommandLine($commandline, $env);
        } elseif (!$this->useFileHandles && $this->isSigchildEnabled()) {
            // last exit code is output on the fourth pipe and caught to work around --enable-sigchild
            $descriptors[3] = ['pipe', 'w'];

// See https://unix.stackexchange.com/questions/71205/background-process-pipe-input
            $commandline = '{ ('.$commandline.') <&3 3<&- 3>/dev/null & } 3<&0;';
            $commandline .= 'pid=$!; echo $pid >&3; wait $pid; code=$?; echo $code >&3; exit $code';

// Workaround for the bug, when PTS functionality is enabled.
            // @see : https://bugs.php.net/69442
            $ptsWorkaround = fopen(__FILE__, 'r');
        }

$envPairs = [];
        foreach ($env as $k => $v) {
            if (false !== $v) {
                $envPairs[] = $k.'='.$v;
            }
        }

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

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

if (!\is_resource($this->process)) {
            throw new RuntimeException('Unable to launch a new 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();
    }

/**
     * Restarts the process.
     *
     * Be warned that the process is cloned before being started.
     *
     * @param callable|null $callback A PHP callback to run whenever there is some
     *                                output available on STDOUT or STDERR
     *
     * @return static
     *
     * @throws RuntimeException When process can't be launched
     * @throws RuntimeException When process is already running
     *
     * @see start()
     *
     * @final
     */
    public function restart(callable $callback = null, array $env = []): self
    {
        if ($this->isRunning()) {
            throw new RuntimeException('Process is already running.');
        }

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

return $process;
    }

/**
     * Waits for the process to terminate.
     *
     * The callback receives the type of output (out or err) and some bytes
     * from the output in real-time while writing the standard input to the process.
     * It allows to have feedback from the independent process during execution.
     *
     * @param callable|null $callback A valid PHP callback
     *
     * @return int The exitcode of the process
     *
     * @throws ProcessTimedOutException When process timed out
     * @throws ProcessSignaledException When process stopped after receiving signal
     * @throws LogicException           When process is not yet started
     */
    public function wait(callable $callback = null)
    {
        $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 = '\\' === \DIRECTORY_SEPARATOR ? $this->isRunning() : $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;
    }

/**
     * Waits until the callback returns true.
     *
     * The callback receives the type of output (out or err) and some bytes
     * from the output in real-time while writing the standard input to the process.
     * It allows to have feedback from the independent process during execution.
     *
     * @throws RuntimeException         When process timed out
     * @throws LogicException           When process is not yet started
     * @throws ProcessTimedOutException In case the timeout was reached
     */
    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);
        }
    }

/**
     * Returns the Pid (process identifier), if applicable.
     *
     * @return int|null The process id if running, null otherwise
     */
    public function getPid()
    {
        return $this->isRunning() ? $this->processInformation['pid'] : null;
    }

/**
     * Sends a POSIX signal to the process.
     *
     * @param int $signal A valid POSIX signal (see https://php.net/pcntl.constants)
     *
     * @return $this
     *
     * @throws LogicException   In case the process is not running
     * @throws RuntimeException In case --enable-sigchild is activated and the process can't be killed
     * @throws RuntimeException In case of failure
     */
    public function signal($signal)
    {
        $this->doSignal($signal, true);

return $this;
    }

/**
     * Disables fetching output and error output from the underlying process.
     *
     * @return $this
     *
     * @throws RuntimeException In case the process is already running
     * @throws LogicException   if an idle timeout is set
     */
    public function disableOutput()
    {
        if ($this->isRunning()) {
            throw new RuntimeException('Disabling output while the process is running is not possible.');
        }
        if (null !== $this->idleTimeout) {
            throw new LogicException('Output can not be disabled while an idle timeout is set.');
        }

$this->outputDisabled = true;

return $this;
    }

/**
     * Enables fetching output and error output from the underlying process.
     *
     * @return $this
     *
     * @throws RuntimeException In case the process is already running
     */
    public function enableOutput()
    {
        if ($this->isRunning()) {
            throw new RuntimeException('Enabling output while the process is running is not possible.');
        }

$this->outputDisabled = false;

return $this;
    }

/**
     * Returns true in case the output is disabled, false otherwise.
     *
     * @return bool
     */
    public function isOutputDisabled()
    {
        return $this->outputDisabled;
    }

/**
     * Returns the current output of the process (STDOUT).
     *
     * @return string The process output
     *
     * @throws LogicException in case the output has been disabled
     * @throws LogicException In case the process is not started
     */
    public function getOutput()
    {
        $this->readPipesForOutput(__FUNCTION__);

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

return $ret;
    }

/**
     * Returns the output incrementally.
     *
     * In comparison with the getOutput method which always return the whole
     * output, this one returns the new output since the last call.
     *
     * @return string The process output since the last call
     *
     * @throws LogicException in case the output has been disabled
     * @throws LogicException In case the process is not started
     */
    public function getIncrementalOutput()
    {
        $this->readPipesForOutput(__FUNCTION__);

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

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

return $latest;
    }

/**
     * Returns an iterator to the output of the process, with the output type as keys (Process::OUT/ERR).
     *
     * @param int $flags A bit field of Process::ITER_* flags
     *
     * @throws LogicException in case the output has been disabled
     * @throws LogicException In case the process is not started
     *
     * @return \Generator
     */
    public function getIterator($flags = 0)
    {
        $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);
        }
    }

/**
     * Clears the process output.
     *
     * @return $this
     */
    public function clearOutput()
    {
        ftruncate($this->stdout, 0);
        fseek($this->stdout, 0);
        $this->incrementalOutputOffset = 0;

return $this;
    }

/**
     * Returns the current error output of the process (STDERR).
     *
     * @return string The process error output
     *
     * @throws LogicException in case the output has been disabled
     * @throws LogicException In case the process is not started
     */
    public function getErrorOutput()
    {
        $this->readPipesForOutput(__FUNCTION__);

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

return $ret;
    }

/**
     * Returns the errorOutput incrementally.
     *
     * In comparison with the getErrorOutput method which always return the
     * whole error output, this one returns the new error output since the last
     * call.
     *
     * @return string The process error output since the last call
     *
     * @throws LogicException in case the output has been disabled
     * @throws LogicException In case the process is not started
     */
    public function getIncrementalErrorOutput()
    {
        $this->readPipesForOutput(__FUNCTION__);

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

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

return $latest;
    }

/**
     * Clears the process output.
     *
     * @return $this
     */
    public function clearErrorOutput()
    {
        ftruncate($this->stderr, 0);
        fseek($this->stderr, 0);
        $this->incrementalErrorOutputOffset = 0;

return $this;
    }

/**
     * Returns the exit code returned by the process.
     *
     * @return int|null The exit status code, null if the Process is not terminated
     */
    public function getExitCode()
    {
        $this->updateStatus(false);

return $this->exitcode;
    }

/**
     * Returns a string representation for the exit code returned by the process.
     *
     * This method relies on the Unix exit code status standardization
     * and might not be relevant for other operating systems.
     *
     * @return string|null A string representation for the exit status code, null if the Process is not terminated
     *
     * @see http://tldp.org/LDP/abs/html/exitcodes.html
     * @see http://en.wikipedia.org/wiki/Unix_signal
     */
    public function getExitCodeText()
    {
        if (null === $exitcode = $this->getExitCode()) {
            return null;
        }

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

/**
     * Checks if the process ended successfully.
     *
     * @return bool true if the process ended successfully, false otherwise
     */
    public function isSuccessful()
    {
        return 0 === $this->getExitCode();
    }

/**
     * Returns true if the child process has been terminated by an uncaught signal.
     *
     * It always returns false on Windows.
     *
     * @return bool
     *
     * @throws LogicException In case the process is not terminated
     */
    public function hasBeenSignaled()
    {
        $this->requireProcessIsTerminated(__FUNCTION__);

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

/**
     * Returns the number of the signal that caused the child process to terminate its execution.
     *
     * It is only meaningful if hasBeenSignaled() returns true.
     *
     * @return int
     *
     * @throws RuntimeException In case --enable-sigchild is activated
     * @throws LogicException   In case the process is not terminated
     */
    public function getTermSignal()
    {
        $this->requireProcessIsTerminated(__FUNCTION__);

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

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

/**
     * Returns true if the child process has been stopped by a signal.
     *
     * It always returns false on Windows.
     *
     * @return bool
     *
     * @throws LogicException In case the process is not terminated
     */
    public function hasBeenStopped()
    {
        $this->requireProcessIsTerminated(__FUNCTION__);

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

/**
     * Returns the number of the signal that caused the child process to stop its execution.
     *
     * It is only meaningful if hasBeenStopped() returns true.
     *
     * @return int
     *
     * @throws LogicException In case the process is not terminated
     */
    public function getStopSignal()
    {
        $this->requireProcessIsTerminated(__FUNCTION__);

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

/**
     * Checks if the process is currently running.
     *
     * @return bool true if the process is currently running, false otherwise
     */
    public function isRunning()
    {
        if (self::STATUS_STARTED !== $this->status) {
            return false;
        }

$this->updateStatus(false);

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

/**
     * Checks if the process has been started with no regard to the current state.
     *
     * @return bool true if status is ready, false otherwise
     */
    public function isStarted()
    {
        return self::STATUS_READY != $this->status;
    }

/**
     * Checks if the process is terminated.
     *
     * @return bool true if process is terminated, false otherwise
     */
    public function isTerminated()
    {
        $this->updateStatus(false);

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

/**
     * Gets the process status.
     *
     * The status is one of: ready, started, terminated.
     *
     * @return string The current process status
     */
    public function getStatus()
    {
        $this->updateStatus(false);

return $this->status;
    }

/**
     * Stops the process.
     *
     * @param int|float $timeout The timeout in seconds
     * @param int       $signal  A POSIX signal to send in case the process has not stop at timeout, default is SIGKILL (9)
     *
     * @return int|null The exit-code of the process or null if it's not running
     */
    public function stop($timeout = 10, $signal = null)
    {
        $timeoutMicro = microtime(true) + $timeout;
        if ($this->isRunning()) {
            // given SIGTERM may not be defined and that "proc_terminate" uses the constant value and not the constant itself, we use the same here
            $this->doSignal(15, false);
            do {
                usleep(1000);
            } while ($this->isRunning() && microtime(true) < $timeoutMicro);

if ($this->isRunning()) {
                // Avoid exception here: process is supposed to be running, but it might have stopped just
                // after this line. In any case, let's silently discard the error, we cannot do anything.
                $this->doSignal($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;
    }

/**
     * Adds a line to the STDOUT stream.
     *
     * @internal
     */
    public function addOutput(string $line)
    {
        $this->lastOutputTime = microtime(true);

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

/**
     * Adds a line to the STDERR stream.
     *
     * @internal
     */
    public function addErrorOutput(string $line)
    {
        $this->lastOutputTime = microtime(true);

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

/**
     * Gets the last output time in seconds.
     *
     * @return float|null The last output time in seconds or null if it isn't started
     */
    public function getLastOutputTime(): ?float
    {
        return $this->lastOutputTime;
    }

/**
     * Gets the command line to be executed.
     *
     * @return string The command to execute
     */
    public function getCommandLine()
    {
        return \is_array($this->commandline) ? implode(' ', array_map([$this, 'escapeArgument'], $this->commandline)) : $this->commandline;
    }

/**
     * Sets the command line to be executed.
     *
     * @param string|array $commandline The command to execute
     *
     * @return $this
     *
     * @deprecated since Symfony 4.2.
     */
    public function setCommandLine($commandline)
    {
        @trigger_error(sprintf('The "%s()" method is deprecated since Symfony 4.2.', __METHOD__), \E_USER_DEPRECATED);

$this->commandline = $commandline;

return $this;
    }

/**
     * Gets the process timeout (max. runtime).
     *
     * @return float|null The timeout in seconds or null if it's disabled
     */
    public function getTimeout()
    {
        return $this->timeout;
    }

/**
     * Gets the process idle timeout (max. time since last output).
     *
     * @return float|null The timeout in seconds or null if it's disabled
     */
    public function getIdleTimeout()
    {
        return $this->idleTimeout;
    }

/**
     * Sets the process timeout (max. runtime) in seconds.
     *
     * To disable the timeout, set this value to null.
     *
     * @param int|float|null $timeout The timeout in seconds
     *
     * @return $this
     *
     * @throws InvalidArgumentException if the timeout is negative
     */
    public function setTimeout($timeout)
    {
        $this->timeout = $this->validateTimeout($timeout);

return $this;
    }

/**
     * Sets the process idle timeout (max. time since last output).
     *
     * To disable the timeout, set this value to null.
     *
     * @param int|float|null $timeout The timeout in seconds
     *
     * @return $this
     *
     * @throws LogicException           if the output is disabled
     * @throws InvalidArgumentException if the timeout is negative
     */
    public function setIdleTimeout($timeout)
    {
        if (null !== $timeout && $this->outputDisabled) {
            throw new LogicException('Idle timeout can not be set while the output is disabled.');
        }

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

return $this;
    }

/**
     * Enables or disables the TTY mode.
     *
     * @param bool $tty True to enabled and false to disable
     *
     * @return $this
     *
     * @throws RuntimeException In case the TTY mode is not supported
     */
    public function setTty($tty)
    {
        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 = (bool) $tty;

return $this;
    }

/**
     * Checks if the TTY mode is enabled.
     *
     * @return bool true if the TTY mode is enabled, false otherwise
     */
    public function isTty()
    {
        return $this->tty;
    }

/**
     * Sets PTY mode.
     *
     * @param bool $bool
     *
     * @return $this
     */
    public function setPty($bool)
    {
        $this->pty = (bool) $bool;

return $this;
    }

/**
     * Returns PTY state.
     *
     * @return bool
     */
    public function isPty()
    {
        return $this->pty;
    }

/**
     * Gets the working directory.
     *
     * @return string|null The current working directory or null on failure
     */
    public function getWorkingDirectory()
    {
        if (null === $this->cwd) {
            // getcwd() will return false if any one of the parent directories does not have
            // the readable or search mode set, even if the current directory does
            return getcwd() ?: null;
        }

return $this->cwd;
    }

/**
     * Sets the current working directory.
     *
     * @param string $cwd The new working directory
     *
     * @return $this
     */
    public function setWorkingDirectory($cwd)
    {
        $this->cwd = $cwd;

return $this;
    }

/**
     * Gets the environment variables.
     *
     * @return array The current environment variables
     */
    public function getEnv()
    {
        return $this->env;
    }

/**
     * Sets the environment variables.
     *
     * Each environment variable value should be a string.
     * If it is an array, the variable is ignored.
     * If it is false or null, it will be removed when
     * env vars are otherwise inherited.
     *
     * That happens in PHP when 'argv' is registered into
     * the $_ENV array for instance.
     *
     * @param array $env The new environment variables
     *
     * @return $this
     */
    public function setEnv(array $env)
    {
        // Process can not handle env values that are arrays
        $env = array_filter($env, function ($value) {
            return !\is_array($value);
        });

$this->env = $env;

return $this;
    }

/**
     * Gets the Process input.
     *
     * @return resource|string|\Iterator|null The Process input
     */
    public function getInput()
    {
        return $this->input;
    }

/**
     * Sets the input.
     *
     * This content will be passed to the underlying process standard input.
     *
     * @param string|int|float|bool|resource|\Traversable|null $input The content
     *
     * @return $this
     *
     * @throws LogicException In case the process is running
     */
    public function setInput($input)
    {
        if ($this->isRunning()) {
            throw new LogicException('Input can not be set while the process is running.');
        }

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

return $this;
    }

/**
     * Sets whether environment variables will be inherited or not.
     *
     * @param bool $inheritEnv
     *
     * @return $this
     *
     * @deprecated since Symfony 4.4, env variables are always inherited
     */
    public function inheritEnvironmentVariables($inheritEnv = true)
    {
        @trigger_error(sprintf('The "%s()" method is deprecated since Symfony 4.4, env variables are always inherited.', __METHOD__), \E_USER_DEPRECATED);

if (!$inheritEnv) {
            throw new InvalidArgumentException('Not inheriting environment variables is not supported.');
        }

return $this;
    }

/**
     * Performs a check between the timeout definition and the time the process started.
     *
     * In case you run a background process (with the start method), you should
     * trigger this method regularly to ensure the process timeout
     *
     * @throws ProcessTimedOutException In case the timeout was reached
     */
    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);
        }
    }

/**
     * Returns whether TTY is supported on the current operating system.
     */
    public static function isTtySupported(): bool
    {
        static $isTtySupported;

if (null === $isTtySupported) {
            $isTtySupported = (bool) @proc_open('echo 1 >/dev/null', [['file', '/dev/tty', 'r'], ['file', '/dev/tty', 'w'], ['file', '/dev/tty', 'w']], $pipes);
        }

return $isTtySupported;
    }

/**
     * Returns whether PTY is supported on the current operating system.
     *
     * @return bool
     */
    public static function isPtySupported()
    {
        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);
    }

/**
     * Creates the descriptors needed by the proc_open.
     */
    private function getDescriptors(): array
    {
        if ($this->input instanceof \Iterator) {
            $this->input->rewind();
        }
        if ('\\' === \DIRECTORY_SEPARATOR) {
            $this->processPipes = new WindowsPipes($this->input, !$this->outputDisabled || $this->hasCallback);
        } else {
            $this->processPipes = new UnixPipes($this->isTty(), $this->isPty(), $this->input, !$this->outputDisabled || $this->hasCallback);
        }

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

/**
     * Builds up the callback used by wait().
     *
     * The callbacks adds all occurred output to the specific buffer and calls
     * the user callback (if present) with the received output.
     *
     * @param callable|null $callback The user defined PHP callback
     *
     * @return \Closure A PHP closure
     */
    protected function buildCallback(callable $callback = null)
    {
        if ($this->outputDisabled) {
            return function ($type, $data) use ($callback): bool {
                return 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);
        };
    }

/**
     * Updates the status of the process, reads pipes.
     *
     * @param bool $blocking Whether to use a blocking read call
     */
    protected function updateStatus($blocking)
    {
        if (self::STATUS_STARTED !== $this->status) {
            return;
        }

$this->processInformation = proc_get_status($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();
        }
    }

/**
     * Returns whether PHP has been compiled with the '--enable-sigchild' option or not.
     *
     * @return bool
     */
    protected function isSigchildEnabled()
    {
        if (null !== self::$sigchild) {
            return self::$sigchild;
        }

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

ob_start();
        phpinfo(\INFO_GENERAL);

return self::$sigchild = false !== strpos(ob_get_clean(), '--enable-sigchild');
    }

/**
     * Reads pipes for the freshest output.
     *
     * @param string $caller   The name of the method that needs fresh outputs
     * @param bool   $blocking Whether to use blocking calls or not
     *
     * @throws LogicException in case output has been disabled or process is not started
     */
    private function readPipesForOutput(string $caller, bool $blocking = false)
    {
        if ($this->outputDisabled) {
            throw new LogicException('Output has been disabled.');
        }

$this->requireProcessIsStarted($caller);

$this->updateStatus($blocking);
    }

/**
     * Validates and returns the filtered timeout.
     *
     * @throws InvalidArgumentException if the given timeout is a negative number
     */
    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;
    }

/**
     * Reads pipes, executes callback.
     *
     * @param bool $blocking Whether to use blocking calls or not
     * @param bool $close    Whether to close file handles or not
     */
    private function readPipes(bool $blocking, bool $close)
    {
        $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;
            }
        }
    }

/**
     * Closes process resource, closes file handles, sets the exitcode.
     *
     * @return int The exitcode
     */
    private function close(): int
    {
        $this->processPipes->close();
        if (\is_resource($this->process)) {
            proc_close($this->process);
        }
        $this->exitcode = $this->processInformation['exitcode'];
        $this->status = self::STATUS_TERMINATED;

if (-1 === $this->exitcode) {
            if ($this->processInformation['signaled'] && 0 < $this->processInformation['termsig']) {
                // if process has been signaled, no exitcode but a valid termsig, apply Unix convention
                $this->exitcode = 128 + $this->processInformation['termsig'];
            } elseif ($this->isSigchildEnabled()) {
                $this->processInformation['signaled'] = true;
                $this->processInformation['termsig'] = -1;
            }
        }

// Free memory from self-reference callback created by buildCallback
        // Doing so in other contexts like __destruct or by garbage collector is ineffective
        // Now pipes are closed, so the callback is no longer necessary
        $this->callback = null;

return $this->exitcode;
    }

/**
     * Resets data related to the latest run of the process.
     */
    private function resetProcessData()
    {
        $this->starttime = null;
        $this->callback = null;
        $this->exitcode = null;
        $this->fallbackStatus = [];
        $this->processInformation = null;
        $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;
    }

/**
     * Sends a POSIX signal to the process.
     *
     * @param int  $signal         A valid POSIX signal (see https://php.net/pcntl.constants)
     * @param bool $throwException Whether to throw exception in case signal failed
     *
     * @return bool True if the signal was sent successfully, false otherwise
     *
     * @throws LogicException   In case the process is not running
     * @throws RuntimeException In case --enable-sigchild is activated and the process can't be killed
     * @throws RuntimeException In case of failure
     */
    private function doSignal(int $signal, bool $throwException): bool
    {
        if (null === $pid = $this->getPid()) {
            if ($throwException) {
                throw new LogicException('Can not 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);
        $varCount = 0;
        $varCache = [];
        $cmd = preg_replace_callback(
            '/"(?:(
                [^"%!^]*+
                (?:
                    (?: !LF! | "(?:\^[%!^])?+" )
                    [^"%!^]*+
                )++
            ) | [^"]*+ )"/x',
            function ($m) use (&$env, &$varCache, &$varCount, $uid) {
                if (!isset($m[1])) {
                    return $m[0];
                }
                if (isset($varCache[$m[0]])) {
                    return $varCache[$m[0]];
                }
                if (false !== strpos($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
        );

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

return $cmd;
    }

/**
     * Ensures the process is running or terminated, throws a LogicException if the process has a not started.
     *
     * @throws LogicException if the process has not run
     */
    private function requireProcessIsStarted(string $functionName)
    {
        if (!$this->isStarted()) {
            throw new LogicException(sprintf('Process must be started before calling "%s()".', $functionName));
        }
    }

/**
     * Ensures the process is terminated, throws a LogicException if the process has a status different than "terminated".
     *
     * @throws LogicException if the process is not yet terminated
     */
    private function requireProcessIsTerminated(string $functionName)
    {
        if (!$this->isTerminated()) {
            throw new LogicException(sprintf('Process must be terminated before calling "%s()".', $functionName));
        }
    }

/**
     * Escapes a string to be used as a shell argument.
     */
    private function escapeArgument(?string $argument): string
    {
        if ('' === $argument || null === $argument) {
            return '""';
        }
        if ('\\' !== \DIRECTORY_SEPARATOR) {
            return "'".str_replace("'", "'\\''", $argument)."'";
        }
        if (false !== strpos($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 $env)
    {
        return preg_replace_callback('/"\$\{:([_a-zA-Z]++[_a-zA-Z0-9]*+)\}"/', function ($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 = [];

foreach ($_SERVER as $k => $v) {
            if (\is_string($v) && false !== $v = getenv($k)) {
                $env[$k] = $v;
            }
        }

foreach ($_ENV as $k => $v) {
            if (\is_string($v)) {
                $env[$k] = $v;
            }
        }

return $env;
    }
}

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