Add a macro to define the size of a subsection of a structure.

Used in fork1() and thr_create()
2004-08-13 00:53:40 +00:00 · 2004-08-13 00:53:40 +00:00 · 622c9da995
commit 622c9da995
parent 4386366573
1 changed files with 2 additions and 0 deletions
--- a/sys/sys/cdefs.h
+++ b/sys/sys/cdefs.h
@ -241,6 +241,8 @@
 * require it.
 */
 #define	__offsetof(type, field)	((size_t)(&((type *)0)->field))
+#define	__rangeof(type, start, end) \
+	(__offsetof(type, end) - __offsetof(type, start))

 /*
 * Compiler-dependent macros to declare that functions take printf-like