CONTAINER_OF.h

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#ifndef _AUX_CONTAINER_OF_H
#define _AUX_CONTAINER_OF_H 1
 
#include <stddef.h>
 
#define CONTAINER_OF(ptr, type, member) ((type*)((char*)(ptr) - offsetof(type, member)))
 
#define CONTAINER_OF_SAFE(ptr, type, member) \
    ({ \
        void* p = ptr; \
        ((p != NULL) ? CONTAINER_OF(p, type, member) : NULL); \
    })
 
#endif