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util: add container_of() macro

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This commit is contained in:
Bert Belder 2017-09-04 07:27:11 +02:00
parent 0cd8b52b18
commit 45afb2268e
1 changed files with 5 additions and 0 deletions
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5
src/util.h
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@ -1,6 +1,8 @@
#ifndef EPOLL_UTIL_H_
#define EPOLL_UTIL_H_
#include <stddef.h>
#ifndef _SSIZE_T_DEFINED
#define SSIZE_T_DEFINED
typedef intptr_t ssize_t;
@ -8,4 +10,7 @@ typedef intptr_t ssize_t;
#define array_count(a) (sizeof(a) / (sizeof((a)[0])))
#define container_of(ptr, type, member) \
((type*) ((char*) (ptr) -offsetof(type, member)))
#endif /* EPOLL_UTIL_H_ */