Override each and every rc.d functions to be able to match on the user.

src/etc/rc.d/sndiod

@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# $OpenBSD: sndiod,v 1.2 2011/12/28 14:58:16 ajacoutot Exp $
+# $OpenBSD: sndiod,v 1.3 2016/04/27 17:29:08 ajacoutot Exp $
 
 daemon="/usr/bin/sndiod"
 
@@ -8,4 +8,16 @@ daemon="/usr/bin/sndiod"
 
 rc_reload=NO
 
+rc_check() {
+	pgrep -T "${daemon_rtable}" -U _sndio -q -xf "${pexp}"
+}
+
+rc_reload() {
+	pkill -T "${daemon_rtable}" -U _sndio -HUP -xf "${pexp}"
+}
+
+rc_stop() {
+	pkill -T "${daemon_rtable}" -U _sndio -xf "${pexp}"
+}
+
 rc_cmd $1