145 lines
3.6 KiB
PHP
145 lines
3.6 KiB
PHP
<?php
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/**
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* Laconica - a distributed open-source microblogging tool
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* Copyright (C) 2008, Control Yourself, Inc.
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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 published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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 <http://www.gnu.org/licenses/>.
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*/
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if (!defined('LACONICA')) {
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exit(1);
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}
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class Daemon
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{
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function name()
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{
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return null;
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}
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function background()
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{
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$pid = pcntl_fork();
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if ($pid < 0) { // error
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common_log(LOG_ERR, "Could not fork.");
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return false;
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} else if ($pid > 0) { // parent
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common_log(LOG_INFO, "Successfully forked.");
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exit(0);
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} else { // child
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return true;
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}
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}
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function alreadyRunning()
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{
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$pidfilename = $this->pidFilename();
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if (!$pidfilename) {
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return false;
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}
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if (!file_exists($pidfilename)) {
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return false;
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}
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$contents = file_get_contents($pidfilename);
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if (posix_kill(trim($contents), 0)) {
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return true;
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} else {
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return false;
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}
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}
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function writePidFile()
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{
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$pidfilename = $this->pidFilename();
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if (!$pidfilename) {
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return false;
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}
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return file_put_contents($pidfilename, posix_getpid() . "\n");
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}
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function clearPidFile()
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{
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$pidfilename = $this->pidFilename();
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if (!$pidfilename) {
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return false;
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}
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return unlink($pidfilename);
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}
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function pidFilename()
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{
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$piddir = common_config('daemon', 'piddir');
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if (!$piddir) {
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return null;
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}
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$name = $this->name();
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if (!$name) {
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return null;
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}
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return $piddir . '/' . $name . '.pid';
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}
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function changeUser()
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{
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$username = common_config('daemon', 'user');
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if ($username) {
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$user_info = posix_getpwnam($username);
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if (!$user_info) {
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common_log(LOG_WARNING,
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'Ignoring unknown user for daemon: ' . $username);
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} else {
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common_log(LOG_INFO, "Setting user to " . $username);
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posix_setuid($user_info['uid']);
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}
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}
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$groupname = common_config('daemon', 'group');
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if ($groupname) {
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$group_info = posix_getgrnam($groupname);
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if (!$group_info) {
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common_log(LOG_WARNING,
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'Ignoring unknown group for daemon: ' . $groupname);
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} else {
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common_log(LOG_INFO, "Setting group to " . $groupname);
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posix_setgid($group_info['gid']);
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}
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}
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}
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function runOnce()
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{
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if ($this->alreadyRunning()) {
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common_log(LOG_INFO, $this->name() . ' already running. Exiting.');
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exit(0);
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}
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if ($this->background()) {
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$this->writePidFile();
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$this->changeUser();
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$this->run();
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$this->clearPidFile();
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}
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}
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function run()
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{
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return true;
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}
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}
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