ontroller interface for * the eventpoll file that enables the insertion/removal/change of * file descriptors inside the interest set. */SYSCALL_DEFINE4(epoll_ctl, int, epfd, int, op, int, fd, ... INIT_LIST_HEAD(&epi->fllink); INIT_LIST_HEAD(&epi->pwqlist); epi->ep = ep; /* 设置epitem在RB-Tree中的key */ ep_set_ffd(&epi->ffd, tfile, fd); epi->event = *event; epi->nwait = 0; epi->next ...