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.\" Copyright (C) 2004, 2005, 2007, 2014 Internet Systems Consortium, Inc. ("ISC")
.\" Copyright (C) 2000, 2001 Internet Software Consortium.
.\" 
.\" Permission to use, copy, modify, and/or distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
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.\" 
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.\" PERFORMANCE OF THIS SOFTWARE.
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.\" $Id$
.\"
.hy 0
.ad l
.\"     Title: lwres_getnameinfo
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.71.1 <http://docbook.sf.net/>
.\"      Date: June 18, 2007
.\"    Manual: BIND9
.\"    Source: BIND9
.\"
.TH "LWRES_GETNAMEINFO" "3" "June 18, 2007" "BIND9" "BIND9"
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.SH "NAME"
lwres_getnameinfo \- lightweight resolver socket address structure to hostname and service name
.SH "SYNOPSIS"
.nf
#include <lwres/netdb.h>
.fi
.HP 22
.BI "int lwres_getnameinfo(const\ struct\ sockaddr\ *" "sa" ", size_t\ " "salen" ", char\ *" "host" ", size_t\ " "hostlen" ", char\ *" "serv" ", size_t\ " "servlen" ", int\ " "flags" ");"
.SH "DESCRIPTION"
.PP
This function is equivalent to the
\fBgetnameinfo\fR(3)
function defined in RFC2133.
\fBlwres_getnameinfo()\fR
returns the hostname for the
\fBstruct sockaddr\fR
\fIsa\fR
which is
\fIsalen\fR
bytes long. The hostname is of length
\fIhostlen\fR
and is returned via
\fI*host.\fR
The maximum length of the hostname is 1025 bytes:
\fBNI_MAXHOST\fR.
.PP
The name of the service associated with the port number in
\fIsa\fR
is returned in
\fI*serv.\fR
It is
\fIservlen\fR
bytes long. The maximum length of the service name is
\fBNI_MAXSERV\fR
\- 32 bytes.
.PP
The
\fIflags\fR
argument sets the following bits:
.PP
\fBNI_NOFQDN\fR
.RS 4
A fully qualified domain name is not required for local hosts. The local part of the fully qualified domain name is returned instead.
.RE
.PP
\fBNI_NUMERICHOST\fR
.RS 4
Return the address in numeric form, as if calling inet_ntop(), instead of a host name.
.RE
.PP
\fBNI_NAMEREQD\fR
.RS 4
A name is required. If the hostname cannot be found in the DNS and this flag is set, a non\-zero error code is returned. If the hostname is not found and the flag is not set, the address is returned in numeric form.
.RE
.PP
\fBNI_NUMERICSERV\fR
.RS 4
The service name is returned as a digit string representing the port number.
.RE
.PP
\fBNI_DGRAM\fR
.RS 4
Specifies that the service being looked up is a datagram service, and causes getservbyport() to be called with a second argument of "udp" instead of its default of "tcp". This is required for the few ports (512\-514) that have different services for UDP and TCP.
.RE
.SH "RETURN VALUES"
.PP
\fBlwres_getnameinfo()\fR
returns 0 on success or a non\-zero error code if an error occurs.
.SH "SEE ALSO"
.PP
\fBRFC2133\fR(),
\fBgetservbyport\fR(3),
\fBlwres\fR(3),
\fBlwres_getnameinfo\fR(3),
\fBlwres_getnamebyaddr\fR(3).
\fBlwres_net_ntop\fR(3).
.SH "BUGS"
.PP
RFC2133 fails to define what the nonzero return values of
\fBgetnameinfo\fR(3)
are.
.SH "COPYRIGHT"
Copyright \(co 2004, 2005, 2007, 2014 Internet Systems Consortium, Inc. ("ISC")
.br
Copyright \(co 2000, 2001 Internet Software Consortium.
.br