Re: capturing on both interfaces simultaneously

[rixed () happyleptic org]

I did not remember what select() uses to return the readable file
descriptors, but I do remember that any select can be interrupted
while still waiting, and that the error is then EINTR, so you have
to catch this particular error and ignore it (ie. merely loop on
it).
Googling for "non-restartable system call" may provide you with more
detail.
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