daemon: timeout structure for IO.

For better or worse, the ccan/timer structure is completely minimal,
and designed to be wrapped inside a container structure.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

daemon/timeout.c

@@ -0,0 +1,18 @@
+#include "lightningd.h"
+#include "timeout.h"
+
+void init_timeout_(struct timeout *t, unsigned int interval,
+		   void (*cb)(void *), void *arg)
+{
+	timer_init(&t->timer);
+	t->interval = time_from_sec(interval);
+	t->cb = cb;
+	t->arg = arg;
+}
+ 
+void refresh_timeout(struct lightningd_state *state, struct timeout *t)
+{
+	timer_del(&state->timers, &t->timer);
+	timer_add(&state->timers, &t->timer,
+		  timeabs_add(time_now(), t->interval));
+}