On Fri, Aug 26, 2016 at 6:35 AM, <martin.stre...@gmail.com> wrote:
>
> The reason for the morestack call is, that sigtramp is not called in my code
> example. The sa_tramp seems to be overwritten in my call to
> sigaction(int,struct sigaction*,struct sigaction*) and I cannot retrieve the
> original trampoline function via __sigaction(int, struct __sigaction*,
> struct sigaction*), to call it in my handler. Calling it directly would
> probably not work anyway, as sigtrampgo already calls sigreturn, but I want
> to be able to do calculations in the C handler if the Go handler has
> returned. So, I'm quite stuck here. Do you have any ideas?
Interesting. Maybe we need to change this line in setsig in
runtime/os_darwin.go
*(*uintptr)(unsafe.Pointer(&sa.__sigaction_u)) = fn
to be
*(*uintptr)(unsafe.Pointer(&sa.__sigaction_u)) =
unsafe.Pointer(funcPC(sigtramp))
We really don't ever want to call fn here.
Ian
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