in resolver(3), document that _EDNS0 and _DNSSEC are no ops;

diff from kirill miazine

while here, bump all the no op texts to one standard blurb;
help/ok jca

1 files changed, 17 insertions, 6 deletions

diff --git a/src/lib/libc/net/resolver.3 b/src/lib/libc/net/resolver.3
index 74604b9577..c395c9929b 100644
--- a/src/lib/libc/net/resolver.3
+++ b/src/lib/libc/net/resolver.3
@@ -1,4 +1,4 @@
-.\"     $OpenBSD: resolver.3,v 1.34 2016/08/05 16:16:06 schwarze Exp $
+.\"     $OpenBSD: resolver.3,v 1.35 2017/01/24 12:43:00 jmc Exp $
 .\"
 .\" Copyright (c) 1985, 1991, 1993
 .\"     The Regents of the University of California.  All rights reserved.
@@ -27,7 +27,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: August 5 2016 $
+.Dd $Mdocdate: January 24 2017 $
 .Dt RES_INIT 3
 .Os
 .Sh NAME
@@ -130,12 +130,16 @@ Accept authoritative answers only.
 With this option,
 .Fn res_send
 should continue until it finds an authoritative answer or finds an error.
-Currently this is not implemented.
+On
+.Ox
+this option does nothing.
 .It Dv RES_USEVC
 Use TCP connections for queries instead of UDP datagrams.
 .It Dv RES_PRIMARY
 Query the primary name server only.
-Currently this is not implemented.
+On
+.Ox
+this option does nothing.
 .It Dv RES_IGNTC
 Ignore truncation errors, i.e. don't retry with TCP.
 .It Dv RES_RECURSE
@@ -178,8 +182,9 @@ feature.
 Enables support for IPv6-only applications.
 This causes IPv4 addresses to be returned as an IPv4 mapped address.
 For example, 10.1.1.1 will be returned as ::ffff:10.1.1.1.
-The option is not meaningful on
-.Ox .
+On
+.Ox
+this option does nothing.
 .It Dv RES_USE_EDNS0
 Attach an OPT pseudo-RR for the EDNS0 extension,
 as specified in RFC 2671.
@@ -188,10 +193,16 @@ allowing them to take advantage of a non-default receive buffer size,
 and thus to send larger replies.
 DNS query packets with the EDNS0 extension are not compatible with
 non-EDNS0 DNS servers.
+On
+.Ox
+this option does nothing.
 .It Dv RES_USE_DNSSEC
 Request that the resolver uses
 Domain Name System Security Extensions (DNSSEC),
 as defined in RFCs 4033, 4034, and 4035.
+On
+.Ox
+this option does nothing.
 .El
 .Pp
 The