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<?php
##
## Copyright (c) 1998-2000 Sascha Schumann <sascha@schumann.cx>
##
## $Id: ct_shm.inc,v 1.2 2000/07/12 18:22:33 kk Exp $
##
## PHPLIB Data Storage Container using Shared Memory
##
class CT_Shm {
##
## Define these parameters by overwriting or by
## deriving your own class from it (recommened)
##
var $max_sessions = 500; ## maximum supported sessions
var $shm_key = 900000; ## key of shared memory segment (unique)
var $shm_size = 64000; ## size in bytes
## end of configuration
var $shmid; ## our shared memory handle
var $semid; ## our semaphore handle
function extract($id) {
return substr($id, 0, strpos($id, "_"));
}
function ac_start() {
$this->shmid = shm_attach($this->shm_key, $this->shm_size, 0600);
}
function ac_get_lock() {
$this->semid = sem_get($this->shm_key + 1);
sem_acquire($this->semid);
}
function ac_release_lock() {
shm_detach($this->shmid);
sem_release($this->semid);
}
function ac_newid($str, $name) {
for($i = 1; $i <= $this->max_sessions &&
(@shm_get_var($this->shmid, $i) != false); $i++);
$id = $i."_".$str;
$this->ac_store($id, $name, "");
return $id;
}
function ac_store($id, $name, $str) {
$val = "$id;".urlencode($name).";".urlencode($str).";".time();
shm_put_var($this->shmid, $this->extract($id), $val);
return true;
}
function ac_delete($id, $name) {
shm_remove_var($this->shmid, $this->extract($id));
}
function ac_gc($gc_time, $name) {
$cmp = time() - $gc_time * 60;
for($i = 1; $i <= $this->max_sessions; $i++)
if(($val = @shm_get_var($this->shmid, $i)) != false) {
$dat = explode(";", $val);
if($name == $dat[1] && strcmp($dat[3], $cmp) < 0)
shm_remove_var($this->shmid, $i);
}
}
function ac_halt($s) {
echo "<b>$s</b>";
exit;
}
function ac_get_value($id, $name) {
$i = $this->extract($id);
$var = shm_get_var($this->shmid, $i);
if($var == "") return("");
$dat = explode(";", $var);
## if classname or md5 id does not match...
if($name != urldecode($dat[1]) || $dat[0] != $id)
$this->ac_halt("security stop");
return urldecode($dat[2]);
}
}
?>
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