[RFC v2 08/20] sysdeps/wait: Use waitid if avaliable

[Florian Weimer]

* Arnd Bergmann:

> The kernel system call waitid() is a superset of glibc's wait4() and
> waitid(), it has an extra rusage argument.
>
> Originally, my plan was to replace kernel's waitid() with
> a waitid_time64() that takes an updated rusage structure,
> but that never happened.
>
> I still left wait4() commented out since it should not be
> needed when the kernel has waitid(). I have an implementation
> of wait4() based on waitid() that I did for musl and tested
> successfully with ltp, see [1].
> Unless I did something very wrong there, you should be able
> to use something like this in glibc.
>
> Similar coversions of timeval have to be done in getrusage(),
> getitimer() and setitimer(), all of which expect a 32-bit
> timeval couting elapsed time (so no overflow in y2038).
> These need to be converted to the 64-bit timeval in the
> public glibc interface.

Does this means that RV32 will use a 32-bit struct timeval in those
system calls?  Even if everything else 64-bit?

Thanks,
Florian