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-rw-r--r--hurd/thread-cancel.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/hurd/thread-cancel.c b/hurd/thread-cancel.c
index 7fb8cd23b4..81828457d5 100644
--- a/hurd/thread-cancel.c
+++ b/hurd/thread-cancel.c
@@ -42,6 +42,8 @@ hurd_thread_cancel (thread_t thread)
 
   if (! ss)
     return EINVAL;
+  if (ss == _hurd_self_sigstate ())
+    return EINTR;		/* Bozo.  */
 
   __spin_lock (&ss->lock);
   assert (! ss->critical_section);