commit 9e093f0b4cc5a5fc455a4893d73dc0f2c5355161
Author: Osier Yang <jyang@redhat.com>
Date:   Mon Aug 15 15:40:46 2011 +0800

    daemon: Fix regression of libvirtd reloading support
    
    This is introduced by commit df0b57a95a, which forgot to
    add signal handler for SIGHUP.
    
    A simple reproduce method:
    
    1) Create a domain XML under /etc/libvirt/qemu
    2) % kill -SIGHUP $(pidof libvirtd)
    3) % virsh list --all (the new created domain XML is not listed)

Index: libvirt-0.9.4/daemon/libvirtd.c
===================================================================
--- libvirt-0.9.4.orig/daemon/libvirtd.c
+++ libvirt-0.9.4/daemon/libvirtd.c
@@ -1139,6 +1139,17 @@ static void daemonShutdownHandler(virNet
     virNetServerQuit(srv);
 }
 
+static void daemonReloadHandler(virNetServerPtr srv ATTRIBUTE_UNUSED,
+                                siginfo_t *sig ATTRIBUTE_UNUSED,
+                                void *opaque ATTRIBUTE_UNUSED)
+{
+        VIR_INFO("Reloading configuration on SIGHUP");
+        virHookCall(VIR_HOOK_DRIVER_DAEMON, "-",
+                    VIR_HOOK_DAEMON_OP_RELOAD, SIGHUP, "SIGHUP", NULL);
+        if (virStateReload() < 0)
+            VIR_WARN("Error while reloading drivers");
+}
+
 static int daemonSetupSignals(virNetServerPtr srv)
 {
     if (virNetServerAddSignalHandler(srv, SIGINT, daemonShutdownHandler, NULL) < 0)
@@ -1147,6 +1158,8 @@ static int daemonSetupSignals(virNetServ
         return -1;
     if (virNetServerAddSignalHandler(srv, SIGTERM, daemonShutdownHandler, NULL) < 0)
         return -1;
+    if (virNetServerAddSignalHandler(srv, SIGHUP, daemonReloadHandler, NULL) < 0)
+        return -1;
     return 0;
 }