Read(2) will block if there is no data so there's no need to sleep.
Using select(2) is one way to go about it but with only one file
descriptor/socket, it seems pointless to me.
Select(2) makes timeout handling (mandatory for disconnectable
devices such as those attached by USB or serial interfaces) much
simpler.
I note in your example that you don't test for ret == 0, which in the
case
of a blocking read means that if the fd is closed for some reason
(e.g. the
device is destroyed due to removal) you will spin forever.
IMO, select with a non-blocking fd is a much cleaner way to implement
this; it also has the advantage of making additions to the code over
time much simpler, as it's an architectural stepping stone to a state-
machine.
= Mike
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