Title: sr_rec()

The network service receives messages from the file system (FS), the ethernet task, the clock task, and the asynchronous alarm task. sr_rec() is called upon the receipt of a message from the file system in the endless loop within main().

If there are any messages in repl_queue, sr_rec() first calls sr_repl_queue() to process the messages in repl_queue before calling sr_open() (for open requests), sr_close() (for close requests), sr_rwio() (for read, write, and io requests), or sr_cancel() (for cancel requests) to further process the message.

Note that "rec" in "sr_rec" stands for "receive".