From e824f8f30d3f797374f6597baf4fb70f48f51b25 Mon Sep 17 00:00:00 2001
From: Uli Schlachter <psychon@znc.in>
Date: Sat, 10 Oct 2015 21:59:12 +0200
Subject: [PATCH] Exit when we loose the WM_Sn selection

Signed-off-by: Uli Schlachter <psychon@znc.in>
---
 awesome.c    |  6 +++---
 event.c      | 11 +++++++++++
 globalconf.h |  2 ++
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/awesome.c b/awesome.c
index 0a19a792..5953f811 100644
--- a/awesome.c
+++ b/awesome.c
@@ -227,7 +227,6 @@ acquire_WM_Sn(void)
 {
     xcb_intern_atom_cookie_t atom_q;
     xcb_intern_atom_reply_t *atom_r;
-    xcb_atom_t atom;
     char *atom_name;
 
     /* Get the WM_Sn atom */
@@ -251,11 +250,12 @@ acquire_WM_Sn(void)
     if(!atom_r)
         fatal("error getting WM_Sn atom");
 
-    atom = atom_r->atom;
+    globalconf.selection_atom = atom_r->atom;
     p_delete(&atom_r);
 
     /* Acquire the selection */
-    xcb_set_selection_owner(globalconf.connection, globalconf.selection_owner_window, atom, XCB_CURRENT_TIME);
+    xcb_set_selection_owner(globalconf.connection, globalconf.selection_owner_window,
+                            globalconf.selection_atom, XCB_CURRENT_TIME);
 }
 
 static void
diff --git a/event.c b/event.c
index 1246772d..44139ccf 100644
--- a/event.c
+++ b/event.c
@@ -862,6 +862,16 @@ event_handle_reparentnotify(xcb_reparent_notify_event_t *ev)
     }
 }
 
+static void
+event_handle_selectionclear(xcb_selection_clear_event_t *ev)
+{
+    if(ev->selection == globalconf.selection_atom)
+    {
+        warn("Lost WM_Sn selection, exiting...");
+        g_main_loop_quit(globalconf.loop);
+    }
+}
+
 /** \brief awesome xerror function.
  * There's no way to check accesses to destroyed windows, thus those cases are
  * ignored (especially on UnmapNotify's).
@@ -921,6 +931,7 @@ void event_handle(xcb_generic_event_t *event)
         EVENT(XCB_PROPERTY_NOTIFY, property_handle_propertynotify);
         EVENT(XCB_REPARENT_NOTIFY, event_handle_reparentnotify);
         EVENT(XCB_UNMAP_NOTIFY, event_handle_unmapnotify);
+        EVENT(XCB_SELECTION_CLEAR, event_handle_selectionclear);
 #undef EVENT
     }
 
diff --git a/globalconf.h b/globalconf.h
index 2299a502..344cfe5f 100644
--- a/globalconf.h
+++ b/globalconf.h
@@ -84,6 +84,8 @@ typedef struct
     key_array_t keys;
     /** Root window mouse bindings */
     button_array_t buttons;
+    /** Atom for WM_Sn */
+    xcb_atom_t selection_atom;
     /** Window owning the WM_Sn selection */
     xcb_window_t selection_owner_window;
     /** Modifiers masks */