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Title: lwres_getnameinfo
Author:
Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
Date: 2007-06-18
Manual: BIND9
Source: ISC
Language: English

"LWRES_GETNAMEINFO" "3" "2007-06-18" "ISC" "BIND9"
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"NAME"
lwres_getnameinfo - lightweight resolver socket address structure to hostname and service name
"SYNOPSIS"
#include <lwres/netdb.h>

\w'int lwres_getnameinfo('u "int lwres_getnameinfo(const struct sockaddr *" "sa" ", size_t " "salen" ", char *" "host" ", size_t " "hostlen" ", char *" "serv" ", size_t " "servlen" ", int " "flags" ");"

"DESCRIPTION"

This function is equivalent to the getnameinfo(3) function defined in RFC2133. lwres_getnameinfo() returns the hostname for the struct sockaddrsa which is salen bytes long. The hostname is of length hostlen and is returned via *host. The maximum length of the hostname is 1025 bytes: NI_MAXHOST.

The name of the service associated with the port number in sa is returned in *serv. It is servlen bytes long. The maximum length of the service name is NI_MAXSERV - 32 bytes.

The flags argument sets the following bits:

NI_NOFQDN

A fully qualified domain name is not required for local hosts. The local part of the fully qualified domain name is returned instead.

NI_NUMERICHOST

Return the address in numeric form, as if calling inet_ntop(), instead of a host name.

NI_NAMEREQD

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.

NI_NUMERICSERV

The service name is returned as a digit string representing the port number.

NI_DGRAM

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.

"RETURN VALUES"

lwres_getnameinfo() returns 0 on success or a non-zero error code if an error occurs.

"SEE ALSO"

RFC2133(), getservbyport(3), lwres(3), lwres_getnameinfo(3), lwres_getnamebyaddr(3). lwres_net_ntop(3).

"BUGS"

RFC2133 fails to define what the nonzero return values of getnameinfo(3) are.

"AUTHOR"

Internet Systems Consortium, Inc.

"COPYRIGHT"

Copyright \(co 2000, 2001, 2004, 2005, 2007, 2014-2016 Internet Systems Consortium, Inc. ("ISC")