I see your point. (Note that the behavior you had implemented in term was
no better on this mark. There has never been a check on the peropen
modes.) From what I can see, on Linux and FreeBSD select and poll will
tell you all about the states you don't have access to. So they don't give
us much advice. I am inclined to simply treat the disallowed accesses as
never happening, i.e. block forever if you select for read on an fd you
can't read. I think this is the most consistent way to best serve the
programs that e.g. request both readability and writability on all their
fds both read-only and write-only. Those programs want nothing select to
wake up only when some fd is ready for an allowed access.
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