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+.\" Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
+.\" Copyright (C) 2000, 2001  Internet Software Consortium.
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+.\" REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+.\" AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+.\" INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+.\" LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+.\" OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+.\" PERFORMANCE OF THIS SOFTWARE.
+.\"
+.\" $Id: lwres_getnameinfo.3,v 1.15.2.1.8.1 2004/03/06 07:41:43 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.