2f2318df87
For historical reasons (stream-interface and connections), we used to require two independent fields for the application level callbacks and the transport-level functions. Over time the distinction faded away so much that the low-level functions became specific to the application and conversely. For example, applets may only work with streams on top since they rely on the channels, and the stream-level functions differ between applets and connections. Right now the application level only contains a wake() callback and the low-level ones contain the functions that act at the lower level to perform the shutr/shutw and at the upper level to notify about readability and writability. Let's just merge them together into a single set and get rid of this confusing distinction. Note that the check ops do not define any app-level function since these are only called by streams.