fpm: Convert to new internal polling API#22796
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You may need to hack up the poll backends to not return an error on EINTR. Passes a lot of tests, but need to deal with leak strategy.
Allocate the buffer at the beginning. There is a bit of glue for going between the linked list that FPM uses for record keeping vs. the buffer of FDs that poll API returns, but it's minimal. This does leak memory, so a few more tests fail. Need to figure out strategy for that.
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Very hacky first pass! Gets rid of FPM's own polling backends (only select is the casualty, everything else is handled by the new polling API). The polling API also has some stuff for persistent allocations, and FPM is the first internal consumer it seems.
Testing so far on macOS (kqueue) and Linux (epoll),
Concerns so far:
EINTR, internal polling API does not. Does result in some test failures.