Which POSIX abstractions are still being used and relevant
for today’s application workloads?
Which abstractions are being replaced by new and nonstandard
abstractions?
Are there any specific limitations of traditional abstractions
that motivate these transitions?
Are the replacement abstractions similar in the various
OSes, or are the abstractions diverging?
Are there any blatantly missing abstractions in POSIX,
which modern workloads appear to require? If so, how
are the gaps currently being filled?
Are any traditional abstractions being used in ways for
which they were not intended? If so, what are the performance
or security implications of these uses?