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Make nanosleep and sleep handle interrupts correctly, plus fix alarm

Ron Williamsrequested to merge
rw_van/relibc:sleep-intr into master

There are bugs in alarm, nanosleep and sleep that make them behave differently from Linux native. The following fixes are provided:

  • alarm was failing to cause SIGALRM because the same pointer was being used for both write and read of the time value
  • sleep was not returning the remaining time after EINTR
  • nanosleep was not returning remaining time after EINTR (Redox implementation, not tested yet)

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