[hurd, commited] hurd: make setpriority clamp nice values to 0..2*NZERO-1 [BZ #33614]

[Samuel Thibault]

Collin Funk, le dim. 09 nov. 2025 11:50:50 -0800, a ecrit:
> Samuel Thibault <samuel.thibault@ens-lyon.org> writes:
> 
> > ---
> >  sysdeps/mach/hurd/setpriority.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/sysdeps/mach/hurd/setpriority.c b/sysdeps/mach/hurd/setpriority.c
> > index f1ef46ca26..aff2014457 100644
> > --- a/sysdeps/mach/hurd/setpriority.c
> > +++ b/sysdeps/mach/hurd/setpriority.c
> > @@ -17,6 +17,7 @@
> >  
> >  #include <hurd.h>
> >  #include <hurd/resource.h>
> > +#include <sys/param.h>
> >  
> >  /* Set the priority of all processes specified by WHICH and WHO
> >     to PRIO.  Returns 0 on success, -1 on errors.  */
> > @@ -27,6 +28,8 @@ __setpriority (enum __priority_which which, id_t who, int prio)
> >    error_t pidloser, priloser;
> >    unsigned int npids, ntasks, nwin, nperm, nacces;
> >  
> > +  prio = MAX (0, MIN (2 * NZERO - 1, prio));
> > +
> >    error_t setonepriority (pid_t pid, struct procinfo *pi)
> >      {
> >        task_t task;
> 
> Isn't NZERO defined to 20 on Hurd? That means (2 * NZERO - 1) == 39, but
> Hurd's max niceness is 38.

I fixed that part in Gnumach.

Samuel