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Subjectsignal handlers not linked properly in do_fork()?

I've been looking at the code for do_fork() / copy_sighand() and am
mystified by the following. It seems that copy_sighand() only sets the
new task's sig member if it is not CLONEd from the parent.

If the signal_struct is CLONEd from the parent, it increments the parent's
signal_struct's reference count, but does not set the new task's sig
member. I see nowhere else in do_fork() where sig is set, either.
What gives?

-David Eger

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