In core.sys.linux.epoll.d, struct epoll_event is declared as follows.


struct epoll_event 
{ 
     uint events;
     epoll_data_t data;
};

But C declaration is packed in epoll.h as follows.

struct epoll_event
{
  uint32_t events;	/* Epoll events */
  epoll_data_t data;	/* User data variable */
} __attribute__ ((__packed__));

So, I think the declaration must be modified in D as follows.

extern(C) align(1) struct epoll_event
{
align(1):
  uint events;	/* Epoll events */
  epoll_data_t data;	/* User data variable */
}

Because of this mismatch in alignment between C and D, epoll_wait in D reports abnormal event user data.(especially u64).

I confirmed this malfunction on code test.