gnu-social/lib/util/daemon.php

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<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
defined('GNUSOCIAL') || die();
class Daemon
{
public $daemonize = true;
public $_id = 'generic';
public function __construct($daemonize = true)
{
$this->daemonize = $daemonize;
}
public function name()
{
return null;
}
public function get_id()
{
return $this->_id;
}
public function set_id($id)
{
$this->_id = $id;
}
public function background()
{
// Database connection will likely get lost after forking
$this->resetDb();
// Double-forking.
foreach (['single', 'double'] as $v) {
switch ($pid = pcntl_fork()) {
case -1: // error
common_log(LOG_ERR, 'Could not fork.');
return false;
case 0: // child
if ($v === 'single') {
posix_setsid();
}
break;
default: // parent
if ($v === 'double') {
common_log(LOG_INFO, 'Successfully forked.');
}
die();
}
}
return true;
}
public function alreadyRunning()
{
$pidfilename = $this->pidFilename();
if (!$pidfilename) {
return false;
}
if (!file_exists($pidfilename)) {
return false;
}
$contents = file_get_contents($pidfilename);
if (posix_kill(trim($contents), 0)) {
return true;
} else {
return false;
}
}
public function writePidFile()
{
$pidfilename = $this->pidFilename();
if (!$pidfilename) {
return false;
}
return file_put_contents($pidfilename, posix_getpid() . "\n");
}
public function clearPidFile()
{
$pidfilename = $this->pidFilename();
if (!$pidfilename) {
return false;
}
return unlink($pidfilename);
}
public function pidFilename()
{
$piddir = common_config('daemon', 'piddir');
if (!$piddir) {
return null;
}
$name = $this->name();
if (!$name) {
return null;
}
return $piddir . '/' . $name . '.pid';
}
public function changeUser()
{
$groupname = common_config('daemon', 'group');
if ($groupname) {
$group_info = posix_getgrnam($groupname);
if (!$group_info) {
common_log(
LOG_WARNING,
'Ignoring unknown group for daemon: ' . $groupname
);
} else {
common_log(LOG_INFO, "Setting group to " . $groupname);
posix_setgid($group_info['gid']);
}
}
$username = common_config('daemon', 'user');
if ($username) {
$user_info = posix_getpwnam($username);
if (!$user_info) {
common_log(
LOG_WARNING,
'Ignoring unknown user for daemon: ' . $username
);
} else {
common_log(LOG_INFO, "Setting user to " . $username);
posix_setuid($user_info['uid']);
}
}
}
public function runOnce()
{
if ($this->alreadyRunning()) {
common_log(LOG_INFO, $this->name() . ' already running. Exiting.');
exit(0);
}
if ($this->daemonize) {
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common_log(LOG_INFO, 'Backgrounding daemon "'.$this->name().'"');
$this->background();
}
$this->writePidFile();
$this->changeUser();
$this->run();
$this->clearPidFile();
}
public function run()
{
return true;
}
}