Re: APIs in New POSIX Edition

[Corinna Vinschen <vinschen@redhat.com>]

On Apr  8 06:38, Joel Sherrill wrote:
> On Thu, Apr 8, 2021, 6:19 AM Corinna Vinschen <vinschen@redhat.com> wrote:
> 
> > On Apr  7 18:26, Joel Sherrill wrote:
> > > Hi
> > >
> > > https://www.opengroup.org/austin/docs/austin_1110.pdf includes a set of
> > new
> > > methods to be added to the POSIX standard. RTEMS has a potential GSoC
> > > student interested in working down the list for RTEMS. Some of these make
> > > sense to be implemented in newlib. All will end up being prototyped in
> > > newlib headers somewhere.
> > >
> > > >From the document and the formatting is completely lost.
> > >
> > >  The additional APIs proposed by participants in the Austin Group that
> > The
> > > Open Group has agreed to sponsor are as follows:
> >
> > > getentropy()
> > > memmem()
> > > reallocarray()
> > > strlcat()
> > > strlcpy()
> > > wcslcat()
> > > wcslcpy()
> >
> > Already in newlib.
> >
> > > ppoll()
> >
> > Already defined in Cygwin.  We don't have a generic poll.h header in
> > newlib.
> >
> > > dladdr()
> >
> > Already defined in Cygwin.  We don't have a generic dlfcn.h header in
> > newlib.  It's questionable if this really belongs in newlib.
> >
> > > getlocalename_l()
> > > posix_getdents()
> > > sig2str()
> > > str2sig()
> >
> > No worries as soon as the API is stable.
> >
> > > pthread_cond_clockwait()
> > > pthread_mutex_clocklock()
> > > pthread_rwlock_clockrdlock()
> > > pthread_rwlock_clockwrlock()
> > > qsort_r()
> > > sem_clockwait()
> >
> > No worries, these APIs won't change compared to their already
> > existing implementations in GLibc.
> >
> 
> Great.
> 
> What feature guard should these be behind? Will it change for the ones
> already in place?

There will be a matching POSIX.1-2021 or so, given by date/month,
with guards along the lines of _POSIX_C_SOURCE >= 202107L.

APIS we already have should keep their current guard or'ed with
the above _POSIX_C_SOURCE test.

APIs we already have but have no guard should get _DEFAULT_SOURCE
or'ed with the above _POSIX_C_SOURCE test.


Yaakov?  Does that make sense?


Thanks,
Corinna