Allow multiple users to share the same aucat server. If aucat is

run by root, it binds a shared address to the socket, cranks the
process priority and drops privileges. sio_open(3) will try to
connect to the private socket first (if any), then to the shared
socket. Only one user may have connections to aucat at a given
time.
based on discussions with henning, pyr and others
ok jacek, deraadt

src/etc/ftpusers

@@ -1,4 +1,4 @@
-#	$OpenBSD: ftpusers,v 1.40 2010/02/22 15:16:45 claudio Exp $
+#	$OpenBSD: ftpusers,v 1.41 2010/04/22 17:43:30 ratchov Exp $
 #
 # list of users disallowed any ftp access.
 # read by ftpd(8).
@@ -50,3 +50,4 @@ _smtpd
 _rwalld
 _nsd
 _ldpd
+_sndio

src/etc/group

@@ -63,6 +63,7 @@ _smtpd:*:95:
 _rwalld:*:96:
 _nsd:*:97:
 _ldpd:*:98:
+_sndio:*:99:
 dialer:*:117:
 nogroup:*:32766:
 nobody:*:32767:

src/etc/mail/aliases

@@ -1,5 +1,5 @@
 #
-#	$OpenBSD: aliases,v 1.32 2010/02/22 15:16:45 claudio Exp $
+#	$OpenBSD: aliases,v 1.33 2010/04/22 17:43:30 ratchov Exp $
 #
 #  Aliases in this file will NOT be expanded in the header from
 #  Mail, but WILL be visible over networks or from /usr/libexec/mail.local.
@@ -50,6 +50,7 @@ _rtadvd: /dev/null
 _rusersd: /dev/null
 _rwalld: /dev/null
 _smtpd: /dev/null
+_sndio: /dev/null
 _snmpd: /dev/null
 _spamd: /dev/null
 _syslogd: /dev/null

src/etc/master.passwd

@@ -45,4 +45,5 @@ _smtpd:*:95:95::0:0:SMTP Daemon:/var/empty:/sbin/nologin
 _rwalld:*:96:96::0:0:rpc.rwalld:/var/empty:/sbin/nologin
 _nsd:*:97:97::0:0:NSD Daemon:/var/empty:/sbin/nologin
 _ldpd:*:98:98::0:0:LDP Daemon:/var/empty:/sbin/nologin
+_sndio:*:99:99::0:0:sndio privsep:/var/empty:/sbin/nologin
 nobody:*:32767:32767::0:0:Unprivileged user for NFS:/nonexistent:/sbin/nologin