libcbfwr/comms.php

   1 <?php
   2 // C = msg key
   3 // L = locking key
   4 $MESSAGE_KEY = ftok(realpath(dirname(__FILE__)), "c"); // to daemon
   5 $LOCKING_KEY = ftok(realpath(dirname(__FILE__)), "l");
   6 $STORE_KEY = ftok(realpath(dirname(__FILE__)), "s");
   7 $CONF_STORE_SIZE = 16777216; // 16M by default
   8
   9 global $MESSAGE_KEY, $LOCKING_KEY, $STORE_KEY, $CONF_STORE_SIZE;
  10
  11 class Comms {
  12         function __construct()
  13         {
  14                 global $MESSAGE_KEY, $LOCKING_KEY, $STORE_KEY;
  15                 $this->semres = sem_get($LOCKING_KEY, 0666);
  16                 $this->msgres = msg_get_queue($MESSAGE_KEY, 0666);
  17         }
  18
  19         function getConfig($type=0)
  20         {
  21                 global $MESSAGE_KEY, $LOCKING_KEY, $STORE_KEY, $CONF_STORE_SIZE;
  22                 sem_acquire($this->semres);
  23                 $shm_space = shm_attach($STORE_KEY, $CONF_STORE_SIZE);
  24                 $config = shm_get_var($shm_space, $type);
  25                 sem_release($this->semres);
  26
  27                 return $config;
  28         }
  29
  30         function lockConfigs()
  31         {
  32                 sem_acquire($this->semres);
  33         }
  34
  35         function unlockConfigs()
  36         {
  37                 sem_release($this->semres);
  38         }
  39
  40
  41         // type = 0 for the fs config
  42         // type = 1 for the boot hardware config
  43         // type = 2 for running config
  44         // type = 3 for web config
  45         function putConfig($config, $type=0)
  46         {
  47                 global $MESSAGE_KEY, $LOCKING_KEY, $STORE_KEY, $CONF_STORE_SIZE;
  48                 sem_acquire($this->semres);
  49                 $shm_space = shm_attach($STORE_KEY, $CONF_STORE_SIZE);
  50                 shm_put_var($shm_space, $type, $config);
  51                 sem_release($this->semres);
  52         }
  53
  54         function waitForMessage()
  55         {
  56                 global $MESSAGE_KEY, $LOCKING_KEY, $STORE_KEY;
  57                 $queue = msg_get_queue($MESSAGE_KEY);
  58                 msg_receive($queue, 0, $msgtype, 1024, $msg);
  59
  60                 return $msg;
  61         }
  62
  63         function sendMessage($msg)
  64         {
  65                 global $MESSAGE_KEY, $LOCKING_KEY, $STORE_KEY;
  66                 $queue = msg_get_queue($MESSAGE_KEY);
  67                 msg_send($queue, 1, $msg);
  68
  69         }
  70
  71         private $semres, $msgres;
  72
  73 }
  74
  75 ?>