PHP pcntl_get_last_error函数代码示例

 /**
  * Handle parent registered sigchild callbacks.
  *
  * @param int $signal_number is the signal that called this function.
  * @access public
  */
 public function signal_handler_sigchild($signal_number)
 {
     // do not allow signals to interrupt this
     declare (ticks=0) {
         // reap all child zombie processes
         if (self::$parent_pid == getmypid()) {
             $status = '';
             do {
                 // get child pid that exited
                 $child_pid = pcntl_waitpid(0, $status, WNOHANG);
                 if ($child_pid > 0) {
                     // child exited
                     $identifier = false;
                     if (!isset($this->forked_children[$child_pid])) {
                         $this->log("Cannot find {$child_pid} in array! (This may be a subprocess not in our fork)", self::LOG_LEVEL_INFO);
                         continue;
                     }
                     $child = $this->forked_children[$child_pid];
                     $identifier = $child['identifier'];
                     // call exit function if and only if its declared */
                     if ($child['status'] == self::WORKER) {
                         $this->invoke_callback($this->parent_function_child_exited[$this->forked_children[$child_pid]['bucket']], array($child_pid, $this->forked_children[$child_pid]['identifier']), true);
                     }
                     // stop the child pid
                     $this->forked_children[$child_pid]['status'] = self::STOPPED;
                     $this->forked_children_count--;
                     // respawn helper processes
                     if ($child['status'] == self::HELPER && $child['respawn'] === true) {
                         $this->log('Helper process ' . $child_pid . ' died, respawning', self::LOG_LEVEL_INFO);
                         $this->helper_process_spawn($child['function'], $child['arguments'], $child['identifier'], true);
                     }
                     // Poll for results from any children
                     $this->post_results($child['bucket']);
                 } elseif ($child_pid < 0) {
                     // ignore acceptable error 'No child processes' given we force this signal to run potentially when no children exist
                     if (pcntl_get_last_error() == 10) {
                         continue;
                     }
                     // pcntl_wait got an error
                     $this->log('pcntl_waitpid failed with error ' . pcntl_get_last_error() . ':' . pcntl_strerror(pcntl_get_last_error()), self::LOG_LEVEL_DEBUG);
                 }
             } while ($child_pid > 0);
         }
     }
 }

 /**
  * Daemonize the current process so it can run in the background.
  *
  * If $pidfile is supplied, the process ID is written there.
  * Provide absolute path names for the parameters to avoid file not found errors or logs inside the source code folder.
  *
  * If an error occurred, a RuntimeException is thrown.
  *
  * @param string $pidfile File to write the process ID of the daemon to
  * @param string $stderr File to redirect STDERR to
  * @param string $stdout File to redirect STDOUT to
  * @param string $stdin File to read STDIN from
  * @throws \RuntimeException
  * @return true
  */
 public static function daemonize($pidfile = null, $stderr = '/dev/null', $stdout = '/dev/null', $stdin = '/dev/null')
 {
     // Allow only cli scripts to daemonize, otherwise you may confuse your webserver
     if (\php_sapi_name() !== 'cli') {
         throw new \RuntimeException('Can only daemonize a CLI process!');
     }
     self::checkPID($pidfile);
     self::reopenFDs($stdin, $stdout, $stderr);
     if (($pid1 = @\pcntl_fork()) < 0) {
         throw new \RuntimeException('Failed to fork, reason: "' . \pcntl_strerror(\pcntl_get_last_error()) . '"');
     } elseif ($pid1 > 0) {
         exit;
     }
     if (@posix_setsid() === -1) {
         throw new \RuntimeException('Failed to become session leader, reason: "' . \posix_strerror(\posix_get_last_error()) . '"');
     }
     if (($pid2 = @\pcntl_fork()) < 0) {
         throw new \RuntimeException('Failed to fork, reason: "' . \pcntl_strerror(\pcntl_get_last_error()) . '"');
     } elseif ($pid2 > 0) {
         exit;
     }
     chdir('/');
     umask(022);
     self::writePID($pidfile);
     return true;
 }

 /**
  * @param \Extended\Process\Runnable $child
  *      A runnable process to fork
  */
 public function fork(Runnable $child)
 {
     $this->pid = pcntl_fork();
     if ($this->pid == -1) {
         $error = pcntl_strerror(pcntl_get_last_error());
         throw new ProcessException('Unable to fork the process: ' . $error);
     } elseif ($this->pid) {
         return pcntl_wait($this->pid);
     }
     self::$buffer->append($child->run());
 }

 /**
  * Fork.
  *
  * fork() helper method for php-resque
  *
  * @see pcntl_fork()
  *
  * @return Process|null An instance of Process representing the child in the parent, or null in the child.
  * @throws \Resque\Component\Core\Exception\ResqueRuntimeException when cannot fork, or fork failed.
  */
 public function fork()
 {
     if (!function_exists('pcntl_fork')) {
         throw new ResqueRuntimeException('pcntl_fork is not available');
     }
     $this->setPidFromCurrentProcess();
     $pid = pcntl_fork();
     if ($pid === -1) {
         throw new ResqueRuntimeException(sprintf('Unable to fork child. %s', pcntl_strerror(pcntl_get_last_error())));
     }
     if (0 === $pid) {
         // Forked and we're the child, so return nothing.
         return null;
     }
     $child = new self($pid);
     return $child;
 }

 public function testWrite()
 {
     $path = '/tmp/tmp.log';
     $count = 100;
     $workers = 10;
     if (is_file($path)) {
         unlink($path);
     }
     $message = '';
     for ($i = 0; $i < 1000; ++$i) {
         $message .= uniqid();
     }
     $message .= PHP_EOL;
     $pids = [];
     for ($w = 0; $w < $workers; ++$w) {
         $pid = pcntl_fork();
         if (function_exists('pcntl_get_last_error')) {
             $error_number = pcntl_get_last_error();
             $error = "[{$error_number}] " . pcntl_strerror($error_number);
         } else {
             $error = var_export(error_get_last(), true);
         }
         $this->assertNotSame(-1, $pid, "Can't fork: " . $error);
         if ($pid) {
             $pids[] = $pid;
         } else {
             $writer = new AppenderStream($path);
             $writer->setUseLock(true);
             $writer->setUseLockShortMessage(true);
             for ($i = 0; $i < $count; ++$i) {
                 $writer->write(1, $message);
             }
             die;
         }
     }
     foreach ($pids as $p) {
         pcntl_waitpid($p, $status);
     }
     $this->assertSame(13001, strlen($message));
     $c = str_pad('', $count * $workers * strlen($message), $message);
     $this->assertSame($c, file_get_contents($path));
     if (is_file($path)) {
         unlink($path);
     }
 }

 /**
  * @param callable $callable
  * @param array    $arguments
  *
  * @throws \Brick\Process\ProcessException
  */
 public function __construct(callable $callable, array $arguments = [])
 {
     self::checkExtensions();
     $pid = @pcntl_fork();
     if ($pid < 0) {
         $errorCode = pcntl_get_last_error();
         $errorMessage = pcntl_strerror($errorCode);
         throw ProcessException::forkingError($errorCode, $errorMessage);
     }
     if ($pid) {
         // Parent
         $this->pid = $pid;
     } else {
         // Child
         call_user_func_array($callable, $arguments);
         exit(0);
     }
 }

 public function run()
 {
     if ($this->stopped) {
         return 0;
     }
     $pid = pcntl_fork();
     if ($pid < 0) {
         $errno = pcntl_get_last_error();
         throw new \RuntimeException("Cannot fork process, error = " . pcntl_strerror($errno));
     } elseif ($pid == 0) {
         // in child process
         $now = time();
         if ($now < $this->nextRun) {
             if ($this->traceEnabled) {
                 mdebug("Will wait %d seconds for next run of %s", $this->nextRun - $now, $this->name);
             }
             sleep($this->nextRun - $now);
         }
         // run using application
         $this->application->setAutoExit(false);
         // we will handle exit on our own
         $this->application->setCatchExceptions(false);
         // we will catch on our own
         try {
             $ret = $this->application->run($this->input, $this->output);
         } catch (\Exception $e) {
             mtrace($e, "Exception while running command {$this->name}", "error");
             $ret = AbstractDaemonSentinelCommand::EXIT_CODE_COMMON_ERROR;
         }
         // Check if we should alert
         if ($ret != AbstractDaemonSentinelCommand::EXIT_CODE_OK && $this->alert) {
             // alert in child process is better, because we can get more trace here
             malert("Daemon command %s failed with exit code = %d", $this->name, $ret);
             exit(AbstractDaemonSentinelCommand::EXIT_CODE_OK);
             // exit OK because alert is already sent
         } else {
             exit($ret);
         }
     } else {
         $this->lastRun = $this->nextRun;
         return $pid;
     }
 }

 /**
  * @param callable $callable
  * @param PromiseInterface $promise
  * @return mixed The return value of the thread
  *
  * Method where all the implementation logic is to run the callable asynchronously.
  *
  * It must call $promise's setPromisedData when finished.
  */
 protected function runCallable(callable $callable, PromiseInterface $promise)
 {
     $this->callableToRun = $callable;
     fprintf(STDOUT, "Starting runCallable\n");
     if (null !== $this->currentChildPid) {
         // The deamon is already started, change the callable to execute
         $this->setTerminated(false);
         $this->hasToBeRun = true;
         return;
     }
     // Start the deamon.
     $this->currentChildPid = pcntl_fork();
     if (-1 === $this->currentChildPid) {
         throw new PcntlForkException(sprintf("The process could not be forked. Error message: %s", pcntl_get_last_error()));
     } elseif (0 === $this->currentChildPid) {
         fprintf(STDOUT, "Starting deamon\n");
         fprintf(STDOUT, "Has to be run: %b\n", $this->hasToBeRun);
         while (true) {
             if ($this->hasToBeRun) {
                 $this->currentChildPid = posix_getpid();
                 // Here is the child space
                 try {
                     $childValue = call_user_func($this->callableToRun);
                     $succeed = true;
                 } catch (\Throwable $e) {
                     $childValue = $e;
                     $succeed = false;
                 }
                 fprintf(STDOUT, "Got output: %s\n", $childValue);
                 $promise->setPromisedData($childValue, $succeed);
                 $this->setTerminated();
                 fprintf(STDOUT, "Terminated: %b\n", $this->isTerminated());
                 $this->hasToBeRun = false;
             }
         }
     }
 }

 /**
  * @param callable $callback
  * @param array $args
  * @throws Exception
  * @return int Child process PID
  */
 public static function run(callable $callback, $args = [])
 {
     if (!function_exists('pcntl_fork')) {
         throw new Exception('No pcntl is installed');
     }
     $pid = pcntl_fork();
     if (-1 == $pid) {
         throw new Exception('pcntl_fork() error: ' . pcntl_strerror(pcntl_get_last_error()));
     }
     if (0 != $pid) {
         return $pid;
     } else {
         register_shutdown_function(function () {
             ob_end_clean();
             posix_kill(getmypid(), SIGKILL);
         });
         if (empty($args)) {
             call_user_func($callback);
         } else {
             call_user_func_array($callback, $args);
         }
         exit(0);
     }
 }

 protected function waitForBackgroundProcesses()
 {
     //$lastMemory = memory_get_usage(true);
     while (true) {
         //$memory = memory_get_usage(true);
         //if ($memory != $lastMemory) {
         //    echo(
         //        sprintf("memory change: %d, from %d to %d", $memory - $lastMemory, $lastMemory, $memory)
         //        . PHP_EOL
         //    );
         //}
         //$lastMemory = $memory;
         pcntl_signal_dispatch();
         $status = 0;
         $pid = pcntl_waitpid(-1, $status, WNOHANG);
         if ($pid == 0) {
             // no child process has quit
             usleep(200 * 1000);
         } else {
             if ($pid > 0) {
                 // child process with pid = $pid exits
                 $exitStatus = pcntl_wexitstatus($status);
                 $runner = $this->runningProcesses[$pid];
                 if (!$runner instanceof CommandRunner) {
                     throw new \LogicException("Cannot find command runner for process pid = %d", $pid);
                 }
                 unset($this->runningProcesses[$pid]);
                 $runner->onProcessExit($exitStatus, $pid);
                 $newPid = $runner->run();
                 if ($newPid > 0) {
                     $this->runningProcesses[$newPid] = $runner;
                 }
             } else {
                 // error
                 $errno = pcntl_get_last_error();
                 if ($errno == PCNTL_ECHILD) {
                     // all children finished
                     mdebug("No more BackgroundProcessRunner children, continue ...");
                     break;
                 } else {
                     // some other error
                     throw new \RuntimeException("Error waiting for process, error = " . pcntl_strerror($errno));
                 }
             }
         }
     }
 }

 protected function doFork(InputInterface $input, OutputInterface $output)
 {
     $pid = pcntl_fork();
     if ($pid < 0) {
         $errno = pcntl_get_last_error();
         throw new \RuntimeException("Cannot fork process, error = " . pcntl_strerror($errno));
     } elseif ($pid == 0) {
         // in child process
         $ret = $this->doExecute($input, $output);
         exit(is_numeric($ret) ? $ret : 0);
     } else {
         return $pid;
     }
 }

 private function fork()
 {
     for ($i = 0; $i < 3; ++$i) {
         if (isset($pid)) {
             usleep(1000000);
         }
         $pid = pcntl_fork();
         if ($pid >= 0) {
             return $pid;
         }
         $error_number = pcntl_get_last_error();
         $error = "[{$error_number}] " . pcntl_strerror($error_number);
         Logger::getLogger('queue')->warn("Can`t fork, retryNumber={$i}, pid: '" . var_export($pid, true) . "', error: '{$error}'", new Exception());
     }
     throw new RuntimeException('Can`t fork');
 }

 /**
  * 监控worker进程状态，退出重启
  * @param resource $channel
  * @param int $flag
  * @param int $pid 退出的进程id
  * @return mixed
  */
 public static function checkWorkerExit()
 {
     // 由于SIGCHLD信号可能重叠导致信号丢失，所以这里要循环获取所有退出的进程id
     while (($pid = pcntl_waitpid(-1, $status, WUNTRACED | WNOHANG)) != 0) {
         // 如果是重启的进程，则继续重启进程
         if (isset(self::$workerToRestart[$pid]) && self::$serverStatus != self::STATUS_SHUTDOWN) {
             unset(self::$workerToRestart[$pid]);
             self::restartWorkers();
         }
         // 出错
         if ($pid == -1) {
             // 没有子进程了,可能是出现Fatal Err 了
             if (pcntl_get_last_error() == 10) {
                 self::notice('Server has no workers now');
             }
             return -1;
         }
         // 查找子进程对应的woker_name
         $pid_workname_map = self::getPidWorkerNameMap();
         $worker_name = isset($pid_workname_map[$pid]) ? $pid_workname_map[$pid] : '';
         // 没找到worker_name说明出错了 哪里来的野孩子？
         if (empty($worker_name)) {
             self::notice("child exist but not found worker_name pid:{$pid}");
             break;
         }
         // 进程退出状态不是0，说明有问题了
         if ($status !== 0) {
             self::notice("worker exit status {$status} pid:{$pid} worker:{$worker_name}");
         }
         // 记录进程退出状态
         self::$serverStatusInfo['worker_exit_code'][$worker_name][$status] = isset(self::$serverStatusInfo['worker_exit_code'][$worker_name][$status]) ? self::$serverStatusInfo['worker_exit_code'][$worker_name][$status] + 1 : 1;
         // 更新状态到共享内存
         self::updateStatusToShm();
         // 清理这个进程的数据
         self::clearWorker($worker_name, $pid);
         // 如果服务是不是关闭中
         if (self::$serverStatus != self::STATUS_SHUTDOWN) {
             // 重新创建worker
             self::createWorkers();
         } else {
             $all_worker_pid = self::getPidWorkerNameMap();
             if (empty($all_worker_pid)) {
                 // 删除共享内存
                 self::removeShmAndQueue();
                 // 发送提示
                 self::notice("Server stoped");
                 // 删除pid文件
                 @unlink(WORKERMAN_PID_FILE);
                 exit(0);
             }
         }
         //end if
     }
     //end while
 }

 /**
  * 监控worker进程状态，退出重启
  * @param resource $channel
  * @param int $flag
  * @param int $pid 退出的进程id
  * @return mixed
  */
 public static function checkWorkerExit()
 {
     // 由于SIGCHLD信号可能重叠导致信号丢失，所以这里要循环获取所有退出的进程id
     while (($pid = pcntl_waitpid(-1, $status, WUNTRACED | WNOHANG)) != 0) {
         // 如果是重启的进程，则继续重启进程
         if (isset(self::$pidsToRestart[$pid]) && self::$serviceStatus != self::STATUS_SHUTDOWN) {
             unset(self::$pidsToRestart[$pid]);
             self::restartPids();
         }
         // 出错
         if ($pid < 0) {
             self::notice('pcntl_waitpid return ' . $pid . ' and pcntl_get_last_error = ' . pcntl_get_last_error());
             return $pid;
         }
         // 查找子进程对应的woker_name
         $pid_workname_map = self::getPidWorkerNameMap();
         $worker_name = isset($pid_workname_map[$pid]) ? $pid_workname_map[$pid] : '';
         // 没找到worker_name说明出错了
         if (empty($worker_name)) {
             self::notice("child exist but not found worker_name pid:{$pid}");
             break;
         }
         // 进程退出状态不是0，说明有问题了
         if ($status !== 0) {
             self::notice("worker[{$pid}:{$worker_name}] exit with status {$status}");
         }
         // 记录进程退出状态
         self::$serviceStatusInfo['worker_exit_code'][$worker_name][$status] = isset(self::$serviceStatusInfo['worker_exit_code'][$worker_name][$status]) ? self::$serviceStatusInfo['worker_exit_code'][$worker_name][$status] + 1 : 1;
         // 更新状态到共享内存
         self::updateStatusToShm();
         // 清理这个进程的数据
         self::clearWorker($worker_name, $pid);
         // 如果服务是不是关闭中
         if (self::$serviceStatus != self::STATUS_SHUTDOWN) {
             // 重新创建worker
             self::spawnWorkers();
         } else {
             $all_worker_pid = self::getPidWorkerNameMap();
             if (empty($all_worker_pid)) {
                 // 删除共享内存
                 self::removeShmAndQueue();
                 // 发送提示
                 self::notice("Workerman stoped");
                 // 删除pid文件
                 @unlink(WORKERMAN_PID_FILE);
                 exit(0);
             }
         }
         //end if
     }
     //end while
 }

 /**
  * Get Last Error
  *
  * @return int Returns error code.
  */
 public function getLastError()
 {
     return pcntl_get_last_error();
 }