스트림 소켓 상태 알아보기


## stream socket resource state, such as fsockopen(), stream_socket_client()
##
## return value
##   -1 : $handle is empty or is not resource or unknown
##    0 : $handle is not ESTABLISHED
##    1 : $handle is ESTABLISHED
## misc
##    @file_exists('/proc/net/tcp') ? define('_PROCTCP','/proc/net/tcp') : '';
##
function stream_socket_state(&$handle, $inode=NULL)
{
  global $__proctcpfp; // self fp of /proc/net/tcp

  if(!defined('_PROCTCP')) return -1;
  if(!$handle || !@is_resource($handle)) return -1;
  if(!is_resource($__proctcpfp) && !$__proctcpfp = fopen(_PROCTCP,'r')) return -1;

  if(!$inode)
  {
    $fstat = @fstat($handle);
    $inode = $fstat['ino'];
    if($inode === FALSE) return -1;
  }

  rewind($__proctcpfp);
  @fgets($__proctcpfp); // firest line to delete
  while(!feof($__proctcpfp)) // fscanf() best speed
  {
    if(fscanf($__proctcpfp,"%d: %s %s %X %s %s %s %d %d %d %x %s %64s\n",
        $null,$null,$null,$st,$null,$null,$null,$null,$null,$ino,$null,$null,$null)
< 13)
        continue;
    if($inode == $ino)
    {
        $st = hexdec($st); // 1 == ESTABLISHED
        break;
    }
  }
  //fclose($__proctcpfp);

  return ($st===1) ? 1 : FALSE;
}


## example

@file_exists('/proc/net/tcp') ? define('_PROCTCP','/proc/net/tcp') : '';
$fp = fsockopen(....);
$state = stream_socket_state($fp);
echo $state;
fclose($fp);