[Bug 13856] Wrong PID written by start-stop-daemon -S -b -m -p

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13856

--- Comment #1 from Denys Vlasenko <vda.linux at googlemail.com> ---
(In reply to mwadsten from comment #0)
> In any case, it is technically incorrect to use vfork the way
> that debianutils/start-stop-daemon.c does, because there is no
> defined guarantee that the result of getpid() in the grandchild process is correct.

Can you expand on this? Where does it say that getpid() after vfork() is not
guaranteed to return correct value?

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