diff options
| -rw-r--r-- | src/shared/util.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/shared/util.h b/src/shared/util.h index 17ffd19f55..0246dfd826 100644 --- a/src/shared/util.h +++ b/src/shared/util.h @@ -59,6 +59,17 @@ typedef struct dual_timestamp { #define USEC_PER_MONTH (2629800ULL*USEC_PER_SEC) #define USEC_PER_YEAR (31557600ULL*USEC_PER_SEC) +/* + * 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) );}) + /* What is interpreted as whitespace? */ #define WHITESPACE " \t\n\r" #define NEWLINE "\n\r" |