list: New macro OVS_LIST_POISON for initializing a poisoned list.

To be used in an upcoming commit. Signed-off-by: Ben Pfaff <[email protected]> Acked-by: Jarno Rajahalme <[email protected]>
dhanunjaya · Jul 31, 2015 · 7b71784 · 7b71784
1 parent e467ea4
commit 7b71784
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/lib/list.h b/lib/list.h
@@ -23,6 +23,12 @@
 #include "util.h"
 #include "openvswitch/list.h"
 
+/* "struct ovs_list" with pointers that will (probably) cause segfaults if
+ * dereferenced and, better yet, show up clearly in a debugger. */
+#define OVS_LIST_POISON \
+    (struct ovs_list) { (void *) (uintptr_t) 0xccccccccccccccccULL, \
+                        (void *) (uintptr_t) 0xccccccccccccccccULL }
+
 static inline void list_init(struct ovs_list *);
 static inline void list_poison(struct ovs_list *);
 
@@ -91,7 +97,7 @@ list_init(struct ovs_list *list)
 static inline void
 list_poison(struct ovs_list *list)
 {
-    memset(list, 0xcc, sizeof *list);
+    *list = OVS_LIST_POISON;
 }
 
 /* Inserts 'elem' just before 'before'. */