Document SOCK_DNS flag

ok guenther tedu semarie

diff --git a/lib/libc/sys/socket.2 b/lib/libc/sys/socket.2
index cb62cb4..af3147e 100644 (file)
--- a/lib/libc/sys/socket.2
+++ b/lib/libc/sys/socket.2
@@ -1,4 +1,4 @@
-.\"    $OpenBSD: socket.2,v 1.39 2015/02/28 21:51:57 bentley Exp $
+.\"    $OpenBSD: socket.2,v 1.40 2015/10/20 18:11:53 deraadt Exp $
 .\"    $NetBSD: socket.2,v 1.5 1995/02/27 12:37:53 cgd Exp $
 .\"
 .\" Copyright (c) 1983, 1991, 1993
@@ -30,7 +30,7 @@
 .\"
 .\"     @(#)socket.2   8.1 (Berkeley) 6/4/93
 .\"
-.Dd $Mdocdate: February 28 2015 $
+.Dd $Mdocdate: October 20 2015 $
 .Dt SOCKET 2
 .Os
 .Sh NAME
@@ -105,6 +105,17 @@ argument:
 Set close-on-exec flag on the new descriptor.
 .It SOCK_NONBLOCK
 Set non-blocking I/O mode on the new socket.
+.It SOCK_DNS
+For domains
+.Dv AF_INET
+or
+.Dv AF_INET6 ,
+only allow
+.Xr connect 2 ,
+.Xr sendto 2 ,
+or
+.Xr sendmsg 2
+to the DNS port (typically 53).
 .El
 .Pp
 The