I emailed a Linux kernel dev about a 3 line change they made almost 24 years ago (Oct 1993), and got a detailed reply in 1 hr.
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I wondered about that. UNINTERRUPTIBLE during fork() has been there a long time, saw it in 0.99.14: http://kernelhistory.sourcentral.org/linux-0.99.14/?f=/linux-0.99.14/S/306.html%23L138 …
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Normal fork is only momentarily uninterruptible. But vfork is uninterruptible until the child execs or exits, arbitrarily long.
End of conversation
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