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On 64-bit UNIX and Windows, Haskell `Int` has 64 bits but C `int msecs` has 32 bits, resulting in an overflow. This commit fixes it by switching fdReady() to take int64_t, into which a Haskell `Int` will always fit. (Note we could not switch to `long long` because that is 32 bit on 64-bit Windows machines.) Further, to be able to actually wait longer than ~49 days, we put loops around the waiting syscalls (they all accept only 32-bit integers). Note the timer signal would typically interrupt the syscalls before the ~49 days are over, but you can run Haskell programs without the timer signal, an we want it to be correct in all cases. Reviewers: bgamari, austin, hvr, NicolasT, Phyx Reviewed By: bgamari, Phyx Subscribers: syd, Phyx, rwbarton, thomie GHC Trac Issues: #14262 Differential Revision: https://phabricator.haskell.org/D4011
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