+static LIST_HEAD(closing);
+static LIST_HEAD(always);
+static struct timemono (*nowfn)(void) = time_mono;
+static int (*pollfn)(struct pollfd *fds, nfds_t nfds, int timeout) = poll;
+
+struct timemono (*io_time_override(struct timemono (*now)(void)))(void)
+{
+ struct timemono (*old)(void) = nowfn;
+ nowfn = now;
+ return old;
+}
+
+int (*io_poll_override(int (*poll)(struct pollfd *fds, nfds_t nfds, int timeout)))(struct pollfd *, nfds_t, int)
+{
+ int (*old)(struct pollfd *fds, nfds_t nfds, int timeout) = pollfn;
+ pollfn = poll;
+ return old;
+}