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| author | Michael Brown | 2006-03-23 23:07:21 +0100 |
|---|---|---|
| committer | Michael Brown | 2006-03-23 23:07:21 +0100 |
| commit | 508dcdb3035a2ef826e0feda39c7648df25c88ad (patch) | |
| tree | bda6ea8d0acafacff3519382568cb2a2f65c4de1 /src/include/stddef.h | |
| parent | Pick up the gPXE include files when building prototester. (diff) | |
| download | ipxe-508dcdb3035a2ef826e0feda39c7648df25c88ad.tar.gz ipxe-508dcdb3035a2ef826e0feda39c7648df25c88ad.tar.xz ipxe-508dcdb3035a2ef826e0feda39c7648df25c88ad.zip | |
Added container_of(). This seems about the best place to put it, since
the definition of it uses offsetof(), and the two concepts are related.
Diffstat (limited to 'src/include/stddef.h')
| -rw-r--r-- | src/include/stddef.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/include/stddef.h b/src/include/stddef.h index ee1f1541..6f91d219 100644 --- a/src/include/stddef.h +++ b/src/include/stddef.h @@ -2,12 +2,17 @@ #define STDDEF_H /* for size_t */ -#include "stdint.h" +#include <stdint.h> #undef NULL -#define NULL ((void *)0) +#define NULL ((void *)0) #undef offsetof #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) +#undef container_of +#define container_of(ptr, type, member) ({ \ + const typeof( ((type *)0)->member ) *__mptr = (ptr); \ + (type *)( (char *)__mptr - offsetof(type,member) );}) + #endif /* STDDEF_H */ |