.\" Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
.\" Copyright (C) 2000, 2001  Internet Software Consortium.
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.\" $Id: lwres_getnameinfo.3,v 1.15.2.2 2004/03/15 04:45:02 marka Exp $
.\"
.TH "LWRES_GETNAMEINFO" "3" "Jun 30, 2000" "BIND9" ""
.SH NAME
lwres_getnameinfo \- lightweight resolver socket address structure to hostname and service name
.SH SYNOPSIS
\fB#include <lwres/netdb.h>
.sp
.na
int
lwres_getnameinfo(const struct sockaddr *sa, size_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags);
.ad
\fR
.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: NI_MAXHOST.
.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 NI_MAXSERV - 32 bytes.
.PP
The \fIflags\fR argument sets the following
bits:
.TP
\fBNI_NOFQDN\fR
A fully qualified domain name is not required for local hosts.
The local part of the fully qualified domain name is returned instead.
.TP
\fBNI_NUMERICHOST\fR
Return the address in numeric form, as if calling inet_ntop(),
instead of a host name.
.TP
\fBNI_NAMEREQD\fR
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.
.TP
\fBNI_NUMERICSERV\fR
The service name is returned as a digit string representing the port number.
.TP
\fBNI_DGRAM\fR
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.
.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.