$OpenBSD$
--- src/testzzuf/socat.c.orig	Thu Feb 20 11:13:00 2014
+++ src/testzzuf/socat.c	Mon Apr  6 11:06:03 2015
@@ -89,7 +89,7 @@ zzuf_socat_start ()
         }
       return;
     }
-  setpgrp ();
+  setpgrp (0, 0);
   execvp ("zzuf", args);
   fprintf (stderr, "execution of `zzuf' failed: %s\n", strerror (errno));
   zzuf_pid = 0;                 /* fork failed */
