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diff --git a/src/daemon/PhutilDaemonHandle.php b/src/daemon/PhutilDaemonHandle.php
--- a/src/daemon/PhutilDaemonHandle.php
+++ b/src/daemon/PhutilDaemonHandle.php
@@ -341,6 +341,34 @@
}
}
+ public function didReceiveReloadSignal($signo) {
+ $signame = phutil_get_signal_name($signo);
+ if ($signame) {
+ $sigmsg = pht(
+ 'Reloading in response to signal %d (%s).',
+ $signo,
+ $signame);
+ } else {
+ $sigmsg = pht(
+ 'Reloading in response to signal %d.',
+ $signo);
+ }
+
+ $this->logMessage('RELO', $sigmsg, $signo);
+
+ // This signal means "stop the current process gracefully, then launch
+ // a new identical process once it exits". This can be used to update
+ // daemons after code changes (the new processes will run the new code)
+ // without aborting any running tasks.
+
+ // We SIGINT the daemon but don't set the shutdown flag, so it will
+ // naturally be restarted after it exits, as though it had exited after an
+ // unhandled exception.
+
+ $pid = $this->pid;
+ exec("kill -INT {$pid}");
+ }
+
public function didReceiveGracefulSignal($signo) {
$this->shouldShutdown = true;
if (!$this->isRunning()) {
diff --git a/src/daemon/PhutilDaemonOverseer.php b/src/daemon/PhutilDaemonOverseer.php
--- a/src/daemon/PhutilDaemonOverseer.php
+++ b/src/daemon/PhutilDaemonOverseer.php
@@ -145,6 +145,7 @@
declare(ticks = 1);
pcntl_signal(SIGUSR2, array($this, 'didReceiveNotifySignal'));
+ pcntl_signal(SIGHUP, array($this, 'didReceiveReloadSignal'));
pcntl_signal(SIGINT, array($this, 'didReceiveGracefulSignal'));
pcntl_signal(SIGTERM, array($this, 'didReceiveTerminalSignal'));
}
@@ -346,6 +347,12 @@
}
}
+ public function didReceiveReloadSignal($signo) {
+ foreach ($this->getDaemonHandles() as $daemon) {
+ $daemon->didReceiveReloadSignal($signo);
+ }
+ }
+
public function didReceiveGracefulSignal($signo) {
// If we receive SIGINT more than once, interpret it like SIGTERM.
if ($this->inGracefulShutdown) {

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