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add container_of macro. Needed for list implementation

This commit is contained in:
Sascha Hauer 2007-10-11 15:59:01 +02:00
parent 7a0d5c47c9
commit 996eb57938
1 changed files with 11 additions and 0 deletions
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11
include/common.h
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@ -171,4 +171,15 @@ int run_shell(void);
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
/**
* container_of - cast a member of a structure out to the containing structure
* @ptr: the pointer to the member.
* @type: the type of the container struct this is embedded in.
* @member: the name of the member within the struct.
*
*/
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
#endif /* __COMMON_H_ */