#define MADV_WILLNEED 0x3 /* pre-fault pages */
#define MADV_DONTNEED 0x4 /* discard these pages */
#define MADV_FREE 0x5 /* (Solaris) contents can be freed */
+#define MADV_REMOVE 0x6 /* remove these pages & resources */
/* compatibility flags */
#define MAP_ANON MAP_ANONYMOUS