mask 或delmask ：添加或者删除的事件类型，AE_NONE表示没有任何事件；AE_READABLE表示可读事件；AE_WRITABLE表示可写事件；
如aeCreateFileEvent(loop,e->fd,AE_READABLE,redisAeReadEvent,e);

static int aeApiAddEvent(aeEventLoop *eventLoop, int fd, int mask) {aeApiState *state = eventLoop->apidata;struct kevent ke;if (mask & AE_READABLE) {EV_SET(&ke, fd, EVFILT_READ, EV_ADD, 0, 0, NULL);if (kevent(state->kqfd, &ke, 1, NULL, 0, NULL) == -1) return -1;}if (mask & AE_WRITABLE) {EV_SET(&ke, fd, EVFILT_WRITE, EV_ADD, 0, 0, NULL);if (kevent(state->kqfd, &ke, 1, NULL, 0, NULL) == -1) return -1;}return 0;
}static void aeApiDelEvent(aeEventLoop *eventLoop, int fd, int mask) {aeApiState *state = eventLoop->apidata;struct kevent ke;if (mask & AE_READABLE) {EV_SET(&ke, fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);kevent(state->kqfd, &ke, 1, NULL, 0, NULL);}if (mask & AE_WRITABLE) {EV_SET(&ke, fd, EVFILT_WRITE, EV_DELETE, 0, 0, NULL);kevent(state->kqfd, &ke, 1, NULL, 0, NULL);}
}