創建外部進程，並等待5秒鐘殺死它在PHP

Question

我要殺了5秒鐘後它創造了一個外部進程 這個過程是javac Hello.java & java Hello

我想通了，是殺進程的PID的方法，但低於樣品不能得到pid。

<?php 
system('javac Hello.java & java Hello', $retval); 
popen('javac Hello.java & java Hello', 'w'); 
?> 

我不明白在PHP手冊中的proc_open（）和proc_get_status示例。 在我的情況下，該怎麼做？

Answer 1

這裏是如何使用proc_open（） https://www.sitepoint.com/proc-open-communicate-with-the-outside-world/

我做我的工作創造一個外部進程來編譯，運行java程序，等待秒，殺PHP的java運行過程中一個非常明確的解釋腳本。

這裏是一個腳本：

<?php 
/** 
    This is a judge script for verifying lab assignment 
    of NTU Civil Engineering Computer Programing with no testdata. 
    You can copy, redistribute, or modify it freely. 

    Tips: 
    It is not necessary to use file already provided. 
    Any related file can be uploaded via testdata field. 
    Then how to apply specific file uploaded to ./problem/testdata/[item]/[subitem] 
    completely depends on by how the judge file is defined. 
*/ 

// Error report mechanism of this script 
ini_set('display_errors', '1'); 
ERROR_REPORTING(E_ALL); 


// Auto load class definition file that this script will be using. 
function __autoload($class_name) { 
    include_once($class_name . '.php'); 
} 

class Java_No_Input { 

    private $stu_account; 
    private $item; 
    private $subitem; 
    private $main; 
    private $dir_name; 
    private $status; 
    private $solution_output; 
    private $student_output; 

    private $hookup; 

    public function __construct() { 

     // Arguments: student account, item, subitem 
     $this->stu_account = $_SERVER['argv'][1]; 
     $this->item = $_SERVER['argv'][2]; 
     $this->subitem = $_SERVER['argv'][3]; 

     try { 
      // Connect to MySQL database TAFreeDB 
      $this->hookup = UniversalConnect::doConnect();      

      // Create directory to put source codes temporarily 
      $this->createDir(); 

      // Fetch student and solution source from table [item]_[subitem] 
      $this->fetchSource(); 

      // Start judge 
      $this->startJudge(); 

      // Update judge status 
      $this->updateStatus(); 

      // Remove directory 
      $this->removeDir(); 

      $this->hookup = null; 

      exit(); 
     } 
     catch (PDOException $e) { 
      echo 'Error: ' . $e->getMessage() . '<br>'; 
     } 

    } 

    public function createDir() { 
     $this->dir_name = './process/' . uniqid(time(), true); 
     mkdir($this->dir_name); 
     mkdir($this->dir_name . '/student'); 
     mkdir($this->dir_name . '/solution'); 
    } 

    public function removeDir() { 
     system('rm -rf ' . $this->dir_name, $retval); 
     if ($retval !== 0) { 
      echo 'Directory can not be removed...'; 
      exit(); 
     } 
    } 

    public function fetchSource() { 
     $stmt = $this->hookup->prepare('SELECT main, classname, original_source, ' . $this->stu_account . ' FROM ' . $this->item . '_' . $this->subitem); 
     $stmt->execute(); 
     while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) { 
      if ($row['main'] === 'V') { 
       $this->main = $row['classname']; 
      } 
      $student = fopen($this->dir_name . '/student/' . $row['classname'], 'w'); 
      fwrite($student, $row[$this->stu_account]); 
      fclose($student); 

      $solution = fopen($this->dir_name . '/solution/' . $row['classname'], 'w'); 
      fwrite($solution, $row['original_source']); 
      fclose($solution); 

     } 
    } 

    public function startJudge() { 

     // Solution and student directory whose source is in 
     $solution_dir = $this->dir_name . '/solution'; 
     $student_dir = $this->dir_name . '/student'; 

     // Compile source code from both solution and student 
     $solution_CE = $this->compile($solution_dir); 
     if (!empty($solution_CE)) { 

      // Configure result that will response to client side 
      $error_msg = '<h1>Solution has compiler error</h1>' . '<pre><code>' . $solution_CE . '</code></pre>'; 
      $this->configureView($error_msg); 

      // System error 
      $this->status = 'SE'; 
      return; 

     } 
     $student_CE = $this->compile($student_dir); 
     if (!empty($student_CE)) { 

      // Configure result that will response to client side 
      $error_msg = '<h1>Your source code has compiler error</h1>' . '<pre><code>' . $student_CE . '</code></pre>'; 
      $this->configureView($error_msg); 

      // Compiler error 
      $this->status = 'CE'; 
      return; 

     } 

     // Execute source code from both solution and student 
     $solution_RE = $this->execute($solution_dir, 2); 
     if (!empty($solution_RE)) { 

      // Configure result that will response to client side 
      $error_msg = '<h1>Solution has runtime error</h1>' . '<pre><code>' . $solution_RE . '</code></pre>'; 
      $this->configureView($error_msg); 

      // System error 
      $this->status = 'SE'; 
      return; 

     } 
     $student_RE = $this->execute($student_dir, 2); 
     if (!empty($student_RE)) { 

      // Configure result that will response to client side 
      $error_msg = '<h1>Your source code has runtime error</h1>' . '<pre><code>' . $student_RE . '</code></pre>'; 
      $this->configureView($error_msg); 

      // Runtime error 
      $this->status = 'RE'; 
      return; 

     } 

     // Compare output from both solution and student 
     $this->solution_output = $this->execute($solution_dir, 1); 
     $this->student_output = $this->execute($student_dir, 1); 
     $retval = strcmp($this->solution_output, $this->student_output); 
     if ($retval === 0) { 
      // Accept 
      $this->status = 'AC'; 
     } 
     else { 
      // Wrong Answer 
      $this->status = 'WA'; 
     } 

     // Configure result that will response to client side 
     $error_msg = null; 
     $this->configureView($error_msg); 

     return; 

    } 

    public function compile ($dir) { 
     // Configure descriptor array 
     $desc = array (
       0 => array ('pipe', 'r'), // STDIN for process 
       1 => array ('pipe', 'w'), // STDOUT for process 
       2 => array ('pipe', 'w') // STDERR for process 
     ); 

     // Configure compilation command 
     $cmd = 'javac -d ' . $dir . ' '; 
     $source = glob($dir . '/*'); 
     foreach ($source as $key => $value) { 
      $cmd .= $value . ' '; 
     } 

     // Create compilation process 
     $process = proc_open($cmd, $desc, $pipes); 

     // Close STDIN pipe 
     fclose($pipes[0]); 

     // Get output of STDERR pipe 
     $error = stream_get_contents($pipes[2]); 

     // Close STDOUT and STDERR pipe 
     fclose($pipes[1]); 
     fclose($pipes[2]); 

     // Close process 
     proc_close($process); 

     return $error; 
    } 

    public function execute ($dir, $pipe_id) { 
     // Configure descriptor array 
     $desc = array (
       0 => array ('pipe', 'r'), // STDIN for process 
       1 => array ('pipe', 'w'), // STDOUT for process 
       2 => array ('pipe', 'w') // STDERR for process 
     ); 

     // Configure execution command 
     $cmd = 'exec java -classpath ' . $dir . ' '; 
      $last_pos = strrpos($this->main, '.java'); 
      $classname = substr($this->main, 0, $last_pos); 
      $cmd .= $classname; 

     // Create execution process 
     $process = proc_open($cmd, $desc, $pipes); 

     // Get pid of execution process 
     $process_status = proc_get_status($process); 
     $pid = $process_status['pid']; 

     // Close STDIN pipe 
     fclose($pipes[0]); 

     // Wait seconds 
     sleep(1); 

     // Kill execution process 
     posix_kill($pid, SIGTERM); 

     // Get output of STDOUT or STDERR pipe 
     $output = stream_get_contents($pipes[$pipe_id]); 

     // Close STDOUT and STDERR pipe 
     fclose($pipes[1]); 
     fclose($pipes[2]); 

     return $output; 
    } 

    public function updateStatus() { 
     $stmt = $this->hookup->prepare('UPDATE ' . $this->item . ' SET ' . $this->stu_account . '=\'' . $this->status . '\' WHERE subitem=\'' . $this->subitem . '\''); 
     $stmt->execute(); 
    } 

    public function configureView ($error_msg) { 
     if (!is_null($error_msg)) { 
      echo $error_msg; 
     } 
     else { 
      $result = ''; 
      if ($this->status === 'WA') { 
       $result = 'Wrong Answer'; 
      } 
      if ($this->status === 'AC') { 
       $result = 'Accept'; 
      } 
      echo<<<EOF 
<h1>$result</h1> 
<div class='WHOSE_DIV'> 
<img class='UP_DOWN_IMG' src='./tafree-svg/attention.svg'> 
<div class='RES_DIV'> 
<div class='SOL_DIV'>{$this->solution_output}</div> 
<div class='STU_DIV'>{$this->student_output}</div> 
</div> 
</div> 
EOF; 

     } 
     return; 
    } 

} 

$judger = new Java_No_Input(); 

?>