[issue18963] test_selectors test_above_fd_setsize cases fail on OS X due to infinite hard limit

[R. David Murray]

R. David Murray added the comment:

See also issue issue 17409.

The code isn't setting it to RLIM_INFINITY explicitly, though, so this must mean that OSX is reporting an infinite hard limit when the hard limit is not in fact infinite.  Seems like this is an OSX bug that we will have to work around somehow.  Maybe in getrlimit, by doing the max(OPEN_MAX, rlim_max) dance suggested by the osx man page.

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nosy: +r.david.murray

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