1 files changed, 5 insertions, 0 deletions
diff --git a/libports/manage-multithread.c b/libports/manage-multithread.c
index 1588f632..576e7670 100644
--- a/libports/manage-multithread.c
+++ b/libports/manage-multithread.c
@@ -68,6 +68,11 @@ adjust_priority (unsigned int totalthreads)
     goto error_pset_priv;
 
   err = thread_max_priority (self, pset_priv, 0);
+  /* If we are running in an unprivileged subhurd, we got a faked
+     privileged processor set port.  This is indeed a kind of
+     permission problem, and we treat it as such.  */
+  if (err == KERN_INVALID_ARGUMENT)
+    err = EPERM;
   if (err)
     goto error_max_priority;