1This is a simple example of reading/writing messages back and forth.
2
3The program assumes that it starts up with a handle value to a channel and
4that something on the other end of that channel is sending some number of
5Echo calls along the pipe. The program:
6*) waits for the channel to be readable
7*) reads an incoming message
8*) validates that it seems sane
9*) formats a reply message
10*) sends the reply
11*) goes back to waiting
12until the channel peer is closed or any other error is encountered.
13