積丹尼 Dan Jacobson wrote:
Add:

*GNU sleep will pass that floating number to the system, which might or
  might not ignore the time indicated after the decimal point.

OR

*GNU sleep will round / truncate? the number into a whole number, before
sending it to the system.

"sleep" has always been approximate. If you issue a "sleep X" command, all that you can count on is that you sleep for at least X seconds. We shouldn't document the internals of how "sleep" accomplishes this. That being said, it might make sense to say "sleep is approximate", if we're not saying it already.



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