proc - PHP Script hangs when passing a param to process -


i have downloaded open-source terminal emulator github , modified little. class running process looks this:

<?php  class cprocess {     const proc_ok = true;     const proc_failed = false;      private static $instance = null;      public static function factory() {         if (!isset(self::$instance)) {             self::$instance = new cprocess();         }         return self::$instance;     }      private $pipes;     private $process;     private $stdinref;     private $stdoutref;     private $stderref;      private function __construct() {      }      public function __destruct() {         return $this->close();     }      public function open($command) {         $spec = array(             array("pty"), // stdin             array("pty"), // stdout             array("pty")  // stderr         );          if (!$this->process = proc_open($command, $spec, $this->pipes)) {             return self::proc_failed;         }         $this->stdinref = &$this->pipes[0];         $this->stdoutref = &$this->pipes[1];         $this->stderref = &$this->pipes[2];          $this->setblocking(0);         return self::proc_ok;     }      public function isresource() {         return is_resource($this->process);     }      public function setblocking($blocking = 1) {         return stream_set_blocking($this->stdoutref, $blocking);     }      public function getstatus() {         return proc_get_status($this->process);     }      public function get() {         $out = stream_get_contents($this->stdoutref);         return $out;     }      public function put($data) {         fwrite($this->stdinref, $data . "\n");         sleep(1);         fflush($this->stdinref);     }      public function close() {         if (is_resource($this->process)) {             fclose($this->stdinref);             fclose($this->stdoutref);             fclose($this->stderref);             return proc_close($this->process);         }     }      public function metadata() {         return stream_get_meta_data($this->stdoutref);     }  }

now want authenticate login/password pair using following method:

  public static function autenticate($login, $password) {         if (true === debug_mode) {             error_log("authenticate(): login={$login} password={$password}",0);         }         error_log("test");         self::$username = $login;         $process = cprocess::factory();         $cmd = "su " . escapeshellarg($login);         if (true === debug_mode) {             error_log("authenticate(): cmd={$cmd}", 0);         }          $rc = $process->open($cmd);         usleep(100000); // 500000         if ($rc === cprocess::proc_failed) {             if (true === debug_mode) {                 error_log("authenticate(): process_open() returns {$rc}", 0);             }              return false;         }         if (true === debug_mode) {             error_log("authenticate(): invoking process->put() param={$password}");         }          $process->put($password);         if (true === debug_mode) {             error_log("authenticate(): process->put() returned value");         }          usleep(100000);         return (bool) !$process->close();     }

the problem script hangs when getting $process->put($password);. browser shows 'waiting localhost' , lasts forever. in put(); method of class cprocess tried php_eol instead of \n result same. what's wrong code?

the pipes using should more like, read/write type options...

$spec = array(     0 => array("pipe", "r"),     1 => array("pipe", "w"),     2 => array("file", "/tmp/error-output.log", "a") );

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