client: add refcount for clients

Signed-off-by: Julien Danjou <julien@danjou.info>

client.c

@@ -54,10 +54,12 @@ luaA_client_userdata_new(lua_State *L, client_t *p)
 {
     client_t **pp = lua_newuserdata(L, sizeof(client_t *));
     *pp = p;
+    client_ref(pp);
     return luaA_settype(L, "client");
 }
 
 DO_LUA_EQ(client_t, client, "client")
+DO_LUA_GC(client_t, client, "client", client_unref)
 
 /** Load windows properties, restoring client's tag
  * and floating state before awesome was restarted if any.
@@ -424,6 +426,7 @@ client_manage(xcb_window_t w, xcb_get_geometry_reply_t *wgeom, int screen)
     client_list_push(&globalconf.clients, c);
     /* Append client in history: it'll be last. */
     focus_client_append(c);
+    client_ref(&c);
     /* Push client in stack */
     client_raise(c);
 
@@ -669,6 +672,9 @@ client_unmanage(client_t *c)
 {
     tag_array_t *tags = &globalconf.screens[c->screen].tags;
 
+    if(globalconf.screens[c->screen].client_focus == c)
+        client_unfocus(c);
+
     /* call hook */
     luaA_client_userdata_new(globalconf.L, c);
     luaA_dofunction(globalconf.L, globalconf.hooks.unmanage, 1, 0);
@@ -707,7 +713,10 @@ client_unmanage(client_t *c)
     /* delete properties */
     xcb_delete_property(globalconf.connection, c->win, _AWESOME_PROPERTIES);
 
-    p_delete(&c);
+    /* set client as invalid */
+    c->invalid = true;
+
+    client_unref(&c);
 }
 
 /** Update the WM hints of a client.
@@ -1101,6 +1110,9 @@ luaA_client_newindex(lua_State *L)
     int i;
     titlebar_t **t = NULL;
 
+    if((*c)->invalid)
+        luaL_error(L, "client is invalid\n");
+
     switch(a_tokenize(buf, len))
     {
       case A_TK_NAME:
@@ -1230,6 +1242,9 @@ luaA_client_index(lua_State *L)
     xcb_get_property_cookie_t prop_c;
     xcb_get_property_reply_t *prop_r = NULL;
 
+    if((*c)->invalid)
+        luaL_error(L, "client is invalid\n");
+
     if(luaA_usemetatable(L, 1, 2))
         return 1;
 
@@ -1334,6 +1349,7 @@ const struct luaL_reg awesome_client_meta[] =
     { "__index", luaA_client_index },
     { "__newindex", luaA_client_newindex },
     { "__eq", luaA_client_eq },
+    { "__gc", luaA_client_gc },
     { "__tostring", luaA_client_tostring },
     { NULL, NULL }
 };

client.h

@@ -49,7 +49,7 @@ int luaA_client_newindex(lua_State *);
 
 int luaA_client_userdata_new(lua_State *, client_t *);
 
-DO_SLIST(client_t, client, p_delete)
+DO_SLIST(client_t, client, client_unref)
 
 #endif
 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80

common/xutil.h

@@ -123,10 +123,16 @@ xcb_cursor_t xutil_cursor_new(xcb_connection_t *, unsigned int);
 static inline xcb_screen_t *
 xutil_screen_get(xcb_connection_t *c, int screen)
 {
+    xcb_screen_t *s;
+
     if(xcb_connection_has_error(c))
         fatal("X connection invalid");
 
-    return xcb_aux_get_screen(c, screen);
+    s = xcb_aux_get_screen(c, screen);
+
+    assert(s);
+
+    return s;
 }
 
 #endif

structs.h

@@ -239,6 +239,10 @@ struct statusbar_t
 /** client_t type */
 struct client_t
 {
+    /** Ref counter */
+    int refcount;
+    /** Valid, or not ? */
+    bool invalid;
     /** Client name */
     char *name;
     /** Window geometry */
@@ -294,7 +298,18 @@ struct client_t
     /** Next and previous clients */
     client_t *prev, *next;
 };
+
+static void
+client_delete(client_t **c)
+{
+    button_list_wipe(&(*c)->buttons);
+    p_delete(&(*c)->icon_path);
+    p_delete(&(*c)->name);
+    p_delete(c);
+}
+
 DO_ARRAY(client_t *, client, DO_NOTHING)
+DO_RCNT(client_t, client, client_delete)
 
 struct client_node_t
 {