What does it mean by "#define X X"?
In Linux header file epoll.h , I found the following code: enum EPOLL_EVENTS { EPOLLIN = 0x001, #define EPOLLIN EPOLLIN ... } What does it mean by #define EPOLLIN EPOLLIN ?
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In Linux header file epoll.h , I found the following code: enum EPOLL_EVENTS { EPOLLIN = 0x001, #define EPOLLIN EPOLLIN ... } What does it mean by #define EPOLLIN EPOLLIN ?