MAX_EVENTS
struct epoll_event ev, events[MAX_EVENTS];
err = epoll_wait(epollfd, events, MAX_EVENTS, -1);
struct epoll_event ev[MAX_EVENTS];
event_count = epoll_wait(epoll_fd, ev, MAX_EVENTS, -1);
struct epoll_event event, events[MAX_EVENTS];
c = epoll_wait(epoll_fd, events, MAX_EVENTS, 5000);
struct epoll_event events[MAX_EVENTS];
nfds = epoll_wait(epfd, events, MAX_EVENTS, timeout);