Let a receiver whose app is full keep what came, and say so

A link's delivery the app had no room for was handed over again at the
next turn: a receiver over its memory budget would refuse the same
records as fast as the owner could apply them. And its sender, seeing
records received but not stored for a second, sent the whole window
again every second.

Now a host says a delivery found it full (PureLinkDone.full). The
receiver keeps the records and hands them over again after a pause, 100
ms doubling to 500 ms, and meanwhile its STORED frames carry flag 2: the
app is full and what came is kept. A sender hearing it starts its
one-second wait for the save again, and sends none of it again. The
spec (012) says both sides; the pause is a local choice that must stay
under the sender's wait.

pure_link_done takes the PureLinkDone itself. test-link's new case keeps
the app full for 5 s: 12 hand-overs meanwhile, taken within 0.5 s of
having room, and no record sent again (21,640 without the flag).

1 files changed, 2 insertions, 2 deletions

diff --git a/link/link.h b/link/link.h
index afe1430..3390a82 100644
--- a/link/link.h
+++ b/link/link.h
@@ -38,7 +38,7 @@ void pure_link_close(PureLink *);
 typedef struct PureLinkListener PureLinkListener;
 PureLinkListener *pure_link_listen(PureLinkReceiver *, unsigned port, char *error, size_t size);
 bool pure_link_serve(PureLinkListener *, char *error, size_t size);
-/* stored: the delivery's save succeeded; gap: it stopped at a gap. */
-void pure_link_done(PureLinkListener *, void *token, uint64_t heard, bool stored, bool gap);
+/* How a delivery went: link-protocol.h's PureLinkDone, with its token. */
+void pure_link_done(PureLinkListener *, PureLinkDone);
 void pure_link_listener_close(PureLinkListener *, PureLinkCounts *counts);
 #endif