On Fri, Aug 26, 2016 at 7:36 AM, <martin.stre...@gmail.com> wrote:
>> 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))
>
>
> That's not possible, the signatures of sa_tramp and sa_sigaction do not
> match:
>
> /* union for signal handlers */
> union __sigaction_u {
> void (*__sa_handler)(int);
> void (*__sa_sigaction)(int, struct __siginfo *, void *);
> };
>
> /* Signal vector template for Kernel user boundary */
> struct __sigaction {
> union __sigaction_u __sigaction_u; /* signal handler */
> void (*sa_tramp)(void *, int, int, siginfo_t *, void *);
> sigset_t sa_mask; /* signal mask to apply */
> int sa_flags; /* see signal options below */
> };
Good point. OK, then perhaps we need setsig in os_darwin.go to set
the sigaction field to a new function, written in assembler, like
sigtramp, but taking just the sigaction arguments. And presumably not
calling sigreturn.
Ian
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