Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/**
* @file src/Util/Pidfile.php
*/
namespace Friendica\Util;
/**
* @brief Pidfile class
*/
class PidFile
{
/**
* @brief Read the pid from a given pid file
*
* @param string $file Filename of pid file
*
* @return boolean|string PID or "false" if not existent
*/
static private function pidFromFile($file) {
if (!file_exists($file)) {
return false;
}
return trim(@file_get_contents($file));
}
/**
* @brief Is there a running process with the given pid file
*
* @param string $file Filename of pid file
*
* @return boolean Is it running?
*/
static public function isRunningProcess($file) {
$pid = self::pidFromFile($file);
if (!$pid) {
return false;
}
// Is the process running?
$running = posix_kill($pid, 0);
// If not, then we will kill the stale file
if (!$running) {
self::delete($file);
}
return $running;
}
/**
* @brief Kills a process from a given pid file
*
* @param string $file Filename of pid file
*
* @return boolean Was it killed successfully?
*/
static public function killProcess($file) {
$pid = self::pidFromFile($file);
// We don't have a process id? then we quit
if (!$pid) {
return false;
}
// We now kill the process
$killed = posix_kill($pid, SIGTERM);
// If we killed the process successfully, we can remove the pidfile
if ($killed) {
self::delete($file);
}
return $killed;
}
/**
* @brief Creates a pid file
*
* @param string $file Filename of pid file
*
* @return boolean|string PID or "false" if not created
*/
static public function create($file) {
$pid = self::pidFromFile($file);
// We have a process id? then we quit
if ($pid) {
return false;
}
$pid = getmypid();
file_put_contents($file, $pid);
// Now we check if everything is okay
return self::pidFromFile($file);
}
/**
* @brief Deletes a given pid file
*
* @param string $file Filename of pid file
*
* @return boolean Is it running?
*/
static public function delete($file) {
return @unlink($file);
}
}