--- a/greyhound.php	Tue Aug 05 13:17:57 2008 -0400
+++ b/greyhound.php	Fri Aug 15 23:22:30 2008 -0400
@@ -23,6 +23,7 @@
   // trap SIGTERM
   pcntl_signal(SIGTERM, 'sigterm');
   pcntl_signal(SIGINT,  'sigterm');
+  pcntl_signal(SIGUSR1, 'handle_refresh_signal');
 }
 
 //
@@ -154,3 +155,23 @@
 {
   burnout("Exception caught while running webserver:\n$e");
 }
+
+function handle_refresh_signal()
+{
+  global $httpd;
+  if ( !is_object($httpd) )
+    // we're not serving yet.
+    return false;
+    
+  // we've got an httpd instance; rebuild the playlist
+  rebuild_playlist();
+  
+  // if this is the parent, also ask the children to rebuild.
+  if ( !defined('HTTPD_WS_CHILD') )
+  {
+    foreach ( $httpd->child_list as $pid )
+    {
+      posix_kill($pid, SIGUSR1);
+    }
+  }
+}