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ca0f572)
This macro is a variant on CONTAINER_OF that takes an object pointer
instead of a type name as its second argument. In the following commit
this will simplify many users of CONTAINER_OF.
#define CONTAINER_OF(POINTER, STRUCT, MEMBER) \
((STRUCT *) (void *) ((char *) (POINTER) - offsetof (STRUCT, MEMBER)))
#define CONTAINER_OF(POINTER, STRUCT, MEMBER) \
((STRUCT *) (void *) ((char *) (POINTER) - offsetof (STRUCT, MEMBER)))
+/* Given POINTER, the address of the given MEMBER within an object of the type
+ * that that OBJECT points to, returns OBJECT as a "void *" pointer. OBJECT
+ * must be an lvalue.
+ *
+ * This is the same as CONTAINER_OF except that it infers the structure type
+ * from the type of '*OBJECT'. */
+#define OBJECT_CONTAINING(POINTER, OBJECT, MEMBER) \
+ ((void *) ((char *) (POINTER) \
+ - ((char *) &(OBJECT)->MEMBER - (char *) (OBJECT))))
+
#ifdef __cplusplus
extern "C" {
#endif
#ifdef __cplusplus
extern "C" {
#endif