[PATCH] Cygwin: Fix return value of sched_getaffinity

[Corinna Vinschen]

Hi Mark,

On Jun 24 22:25, Mark Geisert wrote:
> Return what the documentation says, instead of a misreading of it.
> ---
>  winsup/cygwin/sched.cc | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/winsup/cygwin/sched.cc b/winsup/cygwin/sched.cc
> index e7b44d319..8f24bf80d 100644
> --- a/winsup/cygwin/sched.cc
> +++ b/winsup/cygwin/sched.cc
> @@ -608,7 +608,7 @@ done:
>    else
>      {
>        /* Emulate documented Linux kernel behavior on successful return */
> -      status = wincap.cpu_count ();
> +      status = sizeof (cpu_set_t);

Wait... what docs are you referring to?  The Linux man page in Fedora 29
says

 On success, sched_setaffinity() and sched_getaffinity() return  0.   On
 error, -1 is returned, and errno is set appropriately.

Also, while at it, would you mind to rearrange the code a bit at this
point?  I think it's a bit puzzeling that status indicates an error code
as well as the non-errno return code from this function.  Kind of like
this:

  if (status)
    {
      set_errno (status)
      return -1;
    }
  return 0;


Thanks,
Corinna

-- 
Corinna Vinschen
Cygwin Maintainer
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