To-Do list for the event driven I/O model

Convert old code to the new comm_read/comm_write calls

All old networking I/O needs to be converted to use the new comm_read/comm_write calls rather than read()/write() combined with comm_set_select().

Finish comm_connect

comm_connect is a "macro" call, creating a new socket connection

file_handle

Restructure the code to use a file_handle data type rather than the UNIX fd number. (cbdata)

Data buffers

Implement reference counted data buffers for I/O

...

There is probably many other functions in comm.c which needs to be rewritten/redesigned to fit the new model