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In the current kernel there is potential for supporting the
sigaltstack() call, and struct sigaction contains an obsolete
field (sa_restorer) which could probably be changed to something
like sa_sigaltsp. Shouldn't this be moved out into the kernel
task_struct because according to the definition of sigaltstack()
the signal stack is not per sig-handler but 1 per process, even
though sigaltstack() can be called multiple times.

Am I wrong about this?

In any case, what would be the side effects? There is no sigaltstack()
in libc 5.3.12 as far as I can see so I dont see a problem with patching
it. I do see alternate stack stuff in elfcore struct elf_prstatus but
it is #if 0, (waiting for someone to imp? :) )


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