function watchdog()
{
$childpid = 0;
$signals = array(SIGINT, SIGCHLD);
pcntl_sigprocmask(SIG_BLOCK, $signals);
do {
printf("%s watchdog launching daemon...\n", @date('r'));
if (0 === ($childpid = pcntl_fork())) {
unreliable_daemon();
exit(1);
}
$signal = pcntl_sigwaitinfo($signals, $info);
} while ($signal != SIGINT);
echo "watchdog got SIGINT. killing child...\n";
posix_kill($childpid, SIGKILL);
echo "watchdog exiting...\n";
}
/**
* 运行守护进程，监控有变化的日志文件。
*
* @see ZtChart_Model_Monitor_Abstract::daemon()
*/
public function run()
{
if (0 == ($pid = pcntl_fork())) {
// 子进程负责处理当前日志
try {
$this->tail($this->_console->getLogPaths());
} catch (ZtChart_Model_Monitor_Exception $e) {
$this->_logger->err($e->getMessage());
exit(1);
}
} else {
if (0 < $pid) {
pcntl_setpriority(-1);
// 父进程负责把子进产生的数据写入数据库
if (pcntl_sigprocmask(SIG_BLOCK, array(SIGCHLD, SIGALRM, SIGINT, SIGTERM))) {
$interval = 10;
// 10秒写一次
pcntl_alarm($interval);
while ($signo = pcntl_sigwaitinfo(array(SIGCHLD, SIGALRM, SIGINT, SIGTERM))) {
if (SIGALRM == $signo) {
pcntl_alarm($interval);
}
try {
$this->extract($interval);
} catch (ZtChart_Model_Monitor_Exception $e) {
posix_kill($pid, 9);
exit(1);
}
if (SIGCHLD == $signo || SIGINT == $signo || SIGTERM == $signo) {
break;
}
}
}
}
}
exit(0);
}
/**
* Sig Wait Info
*
* @param array $set Array of signals to wait for.
* @param array $siginfo The siginfo parameter is set to an array containing informations about the signal.
*
* @return int On success, pcntl_sigwaitinfo() returns a signal number.
*/
public function sigWaitInfo(array $set, array $siginfo)
{
return pcntl_sigwaitinfo($set, $siginfo);
}
/**
* Приостанавливает работу демона
*
* @return void
*/
public function __sleep()
{
$this->iNumberOfWorkers = 0;
foreach ($this->aInstances as $iPID => $sValue) {
pcntl_waitpid($iPID, $iStatus);
if ($iStatus === 0) {
$this->aStopped[$this->aInstances[$iPID]] = $this->aInstances[$iPID];
unset($this->aInstances[$iPID]);
}
}
pcntl_sigwaitinfo(array(SIGCONT), $aInfo);
$this->iNumberOfWorkers = count($this->aWorkers);
}
echo "Got signal from child1\n";
$firstChildIsFree = true;
} elseif ($siginfo['signo'] == SIGUSR2) {
echo "Got signal from child2\n";
$secondChildIsFree = true;
}
}
sleep(1);
}
} else {
pcntl_setpriority(5);
echo "Child2 waiting for SIGHUP\n";
while (true) {
pcntl_sigwaitinfo(array(SIGHUP));
echo "Child2 has been activated\n";
sleep(10);
echo "Child2 is now free, notify parent #{$parentPid}\n";
posix_kill($parentPid, SIGUSR2);
}
}
} else {
pcntl_setpriority(5);
echo "Child1 waiting for SIGHUP\n";
while (true) {
pcntl_sigwaitinfo(array(SIGHUP));
echo "Child1 has been activated\n";
sleep(10);
echo "Child1 is now free, notify parent #{$parentPid}\n";
posix_kill($parentPid, SIGUSR1);
}
}
echo "signo === SIGCHLD\n";
var_dump($siginfo['signo'] === SIGCHLD);
echo "signo === uid\n";
var_dump($siginfo['uid'] === posix_getuid());
echo "signo === pid\n";
var_dump($siginfo['pid'] === $pid);
pcntl_waitpid($pid, $status);
set_error_handler(function ($errno, $errstr) {
echo "Error triggered\n";
}, E_WARNING);
echo "sigprocmask with invalid arguments\n";
/* Valgrind expectedly complains about this:
* "sigprocmask: unknown 'how' field 2147483647"
* Skip */
if (getenv("USE_ZEND_ALLOC") !== '0') {
var_dump(pcntl_sigprocmask(PHP_INT_MAX, array(SIGTERM)));
} else {
echo "Error triggered\n";
echo "bool(false)\n";
}
var_dump(pcntl_sigprocmask(SIG_SETMASK, array(0)));
echo "sigwaitinfo with invalid arguments\n";
var_dump(pcntl_sigwaitinfo(array(0)));
echo "sigtimedwait with invalid arguments\n";
var_dump(pcntl_sigtimedwait(array(SIGTERM), $signo, PHP_INT_MAX, PHP_INT_MAX));
} else {
$siginfo = NULL;
pcntl_sigtimedwait(array(SIGINT), $siginfo, 3600, 0);
exit;
}
}
