[eluser]Unknown[/eluser]
Hi,
I'm trying to write a daemon process using code igniter library, and the problem is when I fork the daemon process it can no longer access the CI instance and all the libraries which were initialized in __construct are also inaccessible plus if I create a new CI instance in the child process, I still can't access any library and I get following errors:
ERROR - 2012-02-27 00:13:07 --> Severity: Warning --> include(application/errors/error_general.php): failed to open stream: No such file or directory /srv/http/FreeFileConvert/system/core/Exceptions.php 146
ERROR - 2012-02-27 00:13:07 --> Severity: Warning --> include(): Failed opening 'application/errors/error_general.php' for inclusion (include_path='.:/usr/share/pear') /srv/http/FreeFileConvert/system/core/Exceptions.php 146
Here's my code:
Code:
class Conversion_workers
{
function __construct() {
$this->ci =& get_instance();
$this->ci->load->library('Gearman');
}
private function is_locked($lock_file) {
if(file_exists($lock_file)) {
$lock = fopen($lock_file,"c+"); // open it for WRITING ("w")
if (! flock($lock, LOCK_EX | LOCK_NB)) {
flock($lock, LOCK_UN);
return TRUE;
}
}
return FALSE;
}
private function lock_file($lock_file, &$lock) {
$lock = fopen($lock_file,"c+"); // open it for WRITING ("w")
if (! flock($lock, LOCK_EX | LOCK_NB)) {
//error_log('Unable to lock file.');
return FALSE;
}
fseek($lock, 0);
ftruncate($lock, 0);
fwrite($lock, posix_getpid());
fflush($lock);
return TRUE;
}
private function daemonize($lock_file, &$lock, &$parent)
{
// TODO: In the install check if pcntl_fork supported
if($this->is_locked($lock_file)) {
$parent = TRUE;
return FALSE;
}
$pid = pcntl_fork();
if($pid < 0) {
log_message('error', 'Unable to fork process');
return FALSE;
}
// If we got a good PID, then we can exit the parent process.
if($pid > 0) {
log_message('info', 'Exiting parent as process forked successfully');
$parent = TRUE;
return FALSE;
}
ob_start();
// Change the file mode mask
umask(0);
// Create a new SID for the child process
if (posix_setsid() < 0) {
//error_log('Unable to create a new SID for child process');
return FALSE;
}
// Change the current working directory
if(chdir("/tmp") < 0) {
//error_log('Unable to change directory of the daemonize process');
return FALSE;
}
// Lock in child process to get correct pid in lock file
if(!$this->lock_file($lock_file, $lock)) {
exit;
}
fclose(STDIN); // Close all of the standard
fclose(STDOUT); // file descriptors as we
fclose(STDERR); // are running as a daemon.
register_shutdown_function(create_function('$pars',
'ob_end_clean();posix_kill(posix_getpid(), SIGKILL);'), array());
// Might be good idea to have register_shutdown_function() here if we want to
// check status when the daemon terminates.
return TRUE;
}
private function start_workers() {
$lock_file = $this->ci->config->item('lock_file');
$parent = FALSE;
if(! $this->daemonize($lock_file, $lock, $parent)) {
if($parent)
return;
} else {
// Start a worker
$this->ci->gearman->gearman_worker();
$this->ci->gearman->add_worker_function('some_function', 'some_function_fn');
error_log('Starting worker ['.posix_getpid().']');
while($this->ci->gearman->work());
}
error_log('Exiting worker');
exit;
}
function add_to_queue($function_name, $params) {
$this->start_workers();
$this->ci->gearman->gearman_client();
return $this->ci->gearman->do_job_background($function_name, serialize($params));
}
} // END class Controller
The function "add_to_queue()" works fine but the problem is with "start_worker" which after forking just stops working, I cannot even access log helper functions, that's why I'm using error_log() in my code.
I would be grateful if anyone could help please.
