mongoc_cursor_set_max_await_time_ms(3) on Linux
The text 0dae16eb5d9f, as Debian 9 (Stretch) shipped it.
The maximum amount of time for the server to wait on new documents to satisfy a tailable cursor query. Only applies if the cursor is created from mongoc_collection_find with the query flags MONGOC_QUERY_TAILABLE_CURSOR and MONGOC_QUERY_AWAIT_DATA, and the server is MongoDB 3.2 or later. See the documentation for maxTimeMS and the "getMore" command.