126 lines
2.7 KiB
PHP
126 lines
2.7 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2020, Friendica
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Util;
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/**
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* Pidfile class
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*/
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class PidFile
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{
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/**
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* Read the pid from a given pid file
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*
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* @param string $file Filename of pid file
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*
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* @return boolean|string PID or "false" if not existent
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*/
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static private function pidFromFile($file) {
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if (!file_exists($file)) {
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return false;
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}
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return trim(@file_get_contents($file));
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}
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/**
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* Is there a running process with the given pid file
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*
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* @param string $file Filename of pid file
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*
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* @return boolean Is it running?
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*/
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static public function isRunningProcess($file) {
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$pid = self::pidFromFile($file);
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if (!$pid) {
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return false;
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}
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// Is the process running?
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$running = posix_kill($pid, 0);
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// If not, then we will kill the stale file
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if (!$running) {
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self::delete($file);
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}
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return $running;
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}
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/**
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* Kills a process from a given pid file
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*
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* @param string $file Filename of pid file
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*
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* @return boolean Was it killed successfully?
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*/
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static public function killProcess($file) {
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$pid = self::pidFromFile($file);
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// We don't have a process id? then we quit
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if (!$pid) {
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return false;
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}
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// We now kill the process
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$killed = posix_kill($pid, SIGTERM);
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// If we killed the process successfully, we can remove the pidfile
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if ($killed) {
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self::delete($file);
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}
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return $killed;
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}
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/**
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* Creates a pid file
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*
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* @param string $file Filename of pid file
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*
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* @return boolean|string PID or "false" if not created
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*/
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static public function create($file) {
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$pid = self::pidFromFile($file);
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// We have a process id? then we quit
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if ($pid) {
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return false;
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}
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$pid = getmypid();
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file_put_contents($file, $pid);
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// Now we check if everything is okay
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return self::pidFromFile($file);
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}
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/**
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* Deletes a given pid file
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*
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* @param string $file Filename of pid file
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*
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* @return boolean Is it running?
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*/
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static public function delete($file) {
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return @unlink($file);
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}
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}
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