add RES_DNSRCH

SCCS-vsn: lib/libc/net/resolver.3 1.8

diff --git a/usr/src/lib/libc/net/resolver.3 b/usr/src/lib/libc/net/resolver.3
index 54573cf..2e273e6 100644 (file)
--- a/usr/src/lib/libc/net/resolver.3
+++ b/usr/src/lib/libc/net/resolver.3
@@ -2,9 +2,9 @@
 .\" All rights reserved.  The Berkeley software License Agreement
 .\" specifies the terms and conditions for redistribution.
 .\"
 .\" All rights reserved.  The Berkeley software License Agreement
 .\" specifies the terms and conditions for redistribution.
 .\"

-.\"    @(#)resolver.3  1.7 (Berkeley) %G%
+.\"    @(#)resolver.3  1.8 (Berkeley) %G%

 .\"
 .\"

-.TH RESOLVER 3 "15 November 1985"
+.TH RESOLVER 3 ""

 .UC 4
 .SH NAME
 res_mkquery, res_send, res_init, dn_comp, dn_expand \- resolver routines
 .UC 4
 .SH NAME
 res_mkquery, res_send, res_init, dn_comp, dn_expand \- resolver routines


@@ -61,17 +61,20 @@ res_mkquery, res_send, res_init, dn_comp, dn_expand \- resolver routines
 .br
 .B int  length;
 .SH DESCRIPTION
 .br
 .B int  length;
 .SH DESCRIPTION

-These routines are used for making, sending and interpreting packets to
-Internet domain name servers. Global information that is used by the
+These routines are used for making, sending and interpreting packets
+for use with Internet domain name servers.
+Global information that is used by the

 resolver routines is kept in the variable
 .IR _res .
 resolver routines is kept in the variable
 .IR _res .

-Most of the values have reasonable defaults and can be ignored. Options
+Most of the values have reasonable defaults and can be ignored.
+Options

 stored in
 .I _res.options
 are defined in
 .I resolv.h
 stored in
 .I _res.options
 are defined in
 .I resolv.h

-and are as follows. Options are a simple bit mask and are or'ed in to
-enable.
+and are as follows.
+Options are stored a simple bit mask containing the bitwise ``or''
+of the options enabled.

 .IP RES_INIT
 True if the initial name server address and default domain name are
 initialized (i.e.,
 .IP RES_INIT
 True if the initial name server address and default domain name are
 initialized (i.e.,


@@ -81,11 +84,12 @@ has been called).
 Print debugging messages.
 .IP RES_AAONLY
 Accept authoritative answers only.
 Print debugging messages.
 .IP RES_AAONLY
 Accept authoritative answers only.

-.I Res_send
-will continue until it finds an authoritative answer or finds an error.
+With this option,
+.I res_send
+should continue until it finds an authoritative answer or finds an error.

 Currently this is not implemented.
 .IP RES_USEVC
 Currently this is not implemented.
 .IP RES_USEVC

-Use TCP connections for queries instead of UDP.
+Use TCP connections for queries instead of UDP datagrams.

 .IP RES_STAYOPEN
 Used with RES_USEVC to keep the TCP connection open between
 queries.
 .IP RES_STAYOPEN
 Used with RES_USEVC to keep the TCP connection open between
 queries.


@@ -94,19 +98,31 @@ UDP should be the normal mode used.
 .IP RES_IGNTC
 Unused currently (ignore truncation errors, i.e., don't retry with TCP).
 .IP RES_RECURSE
 .IP RES_IGNTC
 Unused currently (ignore truncation errors, i.e., don't retry with TCP).
 .IP RES_RECURSE

-Set the recursion desired bit in queries. This is the default.
+Set the recursion-desired bit in queries.
+This is the default.

 (
 .I res_send
 does not do iterative queries and expects the name server
 to handle recursion.)
 .IP RES_DEFNAMES
 (
 .I res_send
 does not do iterative queries and expects the name server
 to handle recursion.)
 .IP RES_DEFNAMES

-Append the default domain name to single label queries. This is the default.
+If set,
+.I res_mkquery
+will append the default domain name to single-component names
+(those that do not contain a dot).
+This is the default.
+.IP RES_DNSRCH
+If this option is set,
+the standard host lookup routine
+.IR gethostbyname (3)
+will search for host names in the current domain and in parent domains; see
+.IR hostname (7).

 .PP
 .I Res_init
 .PP
 reads the initialization file to get the default
 domain name and the Internet address of the initial hosts
 .PP
 .I Res_init
 .PP
 reads the initialization file to get the default
 domain name and the Internet address of the initial hosts

-running the name server. If this line does not exist, the host running
+running the name server.
+If this line does not exist, the host running

 the resolver is tried.
 .I Res_mkquery
 makes a standard query message and places it in
 the resolver is tried.
 .I Res_mkquery
 makes a standard query message and places it in


@@ -119,13 +135,14 @@ larger than
 is usually QUERY but can be any of the query types defined in
 .IR nameser.h .
 .I Dname
 is usually QUERY but can be any of the query types defined in
 .IR nameser.h .
 .I Dname

-is the domain name. If
+is the domain name.
+If

 .I dname
 consists of a single label and the RES_DEFNAMES flag is enabled
 .I dname
 consists of a single label and the RES_DEFNAMES flag is enabled

-(the default),
-.I dname
-will be appended with the current domain name. The current
-domain name is defined in a system file and can be overridden
+(the default), the current domain name will be appended to
+.IR dname .
+The current domain name is defined by the hostname
+or is specified in a system file; it can be overridden

 by the environment variable LOCALDOMAIN.
 .I Newrr
 is currently unused but is intended for making update messages.
 by the environment variable LOCALDOMAIN.
 .I Newrr
 is currently unused but is intended for making update messages.


@@ -135,7 +152,8 @@ sends a query to name servers and returns an answer.
 It will call
 .I res_init
 if RES_INIT is not set, send the query to the local name server, and
 It will call
 .I res_init
 if RES_INIT is not set, send the query to the local name server, and

-handle timeouts and retries. The length of the message is returned or
+handle timeouts and retries.
+The length of the message is returned, or

 \-1 if there were errors.
 .PP
 .I Dn_expand
 \-1 if there were errors.
 .PP
 .I Dn_expand


@@ -171,11 +189,15 @@ labels inserted into the message by
 as the name is compressed.
 If
 .I dnptr
 as the name is compressed.
 If
 .I dnptr

-is NULL, we don't try to compress names. If
+is NULL, names are not compressed.
+If

 .I lastdnptr
 .I lastdnptr

-is NULL, we don't update the list.
+is NULL, the list of labels is not updated.

 .SH FILES
 .SH FILES

-/etc/resolv.conf see resolver(5)
+/etc/resolv.conf       see resolver(5)

 .SH "SEE ALSO"
 .SH "SEE ALSO"

-named(8), resolver(5), RFC882, RFC883, RFC973, RFC974,
+gethostbyname(3), named(8), resolver(5), hostname(7),
+.br
+RFC882, RFC883, RFC973, RFC974,
+.br

 SMM:11 Name Server Operations Guide for BIND
 SMM:11 Name Server Operations Guide for BIND