EPOLL_CLOEXEC
if (flags & EPOLL_CLOEXEC) {
flags ^= EPOLL_CLOEXEC;
fd = epoll_create1(EPOLL_CLOEXEC);
fd = epoll_create1(EPOLL_CLOEXEC * 3);
fd = epoll_create1(EPOLL_CLOEXEC * 2);