With the current "optimistic" implementation he will get back non null
but may crash on attempt to write to that memory.
I don't believe that will actually ever happen (if it does, it's a bug;
it _should_ never happen). If you overcommit your memory usage such
that there's not enough disk space to fulfull it, the kernel will start
blocking the threads of non-essential applications, allowing
loginwindow to put up the "you've filled up your disk; please quit some
apps" dialog box, which will free up enough memory to allow apps to
continue running.
-eric
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