[hurd,commited] htl: Add missing fork.h

[Adhemerval Zanella]

On 24/03/2021 10:04, Adhemerval Zanella wrote:
> 
> 
> On 24/03/2021 10:00, Samuel Thibault wrote:
>> Adhemerval Zanella, le mer. 24 mars 2021 09:56:47 -0300, a ecrit:
>>> On 24/03/2021 09:45, Samuel Thibault wrote:
>>>> Adhemerval Zanella, le mer. 24 mars 2021 09:40:36 -0300, a ecrit:
>>>>> Why exactly tst-atfork2 fails without this includes?
>>>>
>>>> It misses the atfork unregister hook called at module unload.
>>>
>>> Ok, but *why* exactly? The sysdeps/htl/pt-atfork.c already
>>> includes register-atfork.h after the fork.h inclusion.
>>
>> It's not pt-atfork.c which needs UNREGISTER_ATFORK, but
>> stdlib/cxa_finalize, which gets it from fork.h
> 
> Thanks, this is a good indication that is better to just remove
> the ifdef UNREGISTER_ATFORK from cxa_finalize (since now it is
> defined on generic implementation).

And I think the fork.h header is not really required here, it is
being used solely to define the NPTL specific __fork_generation,
which Florian recent patch moves to libc.so.  So I think we can
move this declaration to another internal header and remove
fork.h.