[musl] [PATCH] add support for POSIX_SPAWN_SETSID

[Rich Felker]

On Fri, Mar 31, 2017 at 12:01:56PM -0400, Rich Felker wrote:
> On Fri, Mar 31, 2017 at 04:02:43PM +1100, daurnimator wrote:
> > This patch adds support for the POSIX_SPAWN_SETSID flag.
> > 
> > It was recently accepted by the Austin Group:
> > http://austingroupbugs.net/view.php?id=1044
> > 
> > ---
> >  include/spawn.h           | 1 +
> >  src/process/posix_spawn.c | 4 ++++
> >  2 files changed, 5 insertions(+)
> > 
> > diff --git a/include/spawn.h b/include/spawn.h
> > index 29c799ee..7dee7cfa 100644
> > --- a/include/spawn.h
> > +++ b/include/spawn.h
> > @@ -21,6 +21,7 @@ struct sched_param;
> >  #define POSIX_SPAWN_SETSIGMASK 8
> >  #define POSIX_SPAWN_SETSCHEDPARAM 16
> >  #define POSIX_SPAWN_SETSCHEDULER 32
> > +#define POSIX_SPAWN_SETSID 64
> 
> This overlaps with the glibc value for POSIX_SPAWN_USEVFORK; while we
> don't implement it, we also don't want to have mismatched constant
> ABI.
> 
> I know this is asking a lot, but could you possibly submit a glibc
> patch too so the intended value (128 I guess?) is established on their
> side too, or (yay if you can!) poke somebody else to do it? In the
> past I've tried to just get them to casually agree to assigning values
> for things like this before they implement them, but I haven't had
> much luck.
> 
> Cc'ing libc-alpha too.

Thanks for all your work on this! Based on the glibc patch review, I'm
changing the error condition from !=0 to <0, and of course changing
the flag value to 128 to match.

Rich