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- Copyright (C) 2000, 2001, 2004, 2005, 2007, 2014-2016, 2018-2020 Internet Systems Consortium, Inc. ("ISC")
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-
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- This Source Code Form is subject to the terms of the Mozilla Public
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- License, v. 2.0. If a copy of the MPL was not distributed with this
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- file, You can obtain one at http://mozilla.org/MPL/2.0/.
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-->
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>lwres_getnameinfo</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Name
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lwres_getnameinfo
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— lightweight resolver socket address structure to hostname and
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service name
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Synopsis
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#include <lwres/netdb.h>
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int
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lwres_getnameinfo(
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const struct sockaddr *sa,
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size_t salen,
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char *host,
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size_t hostlen,
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char *serv,
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size_t servlen,
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int flags);
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DESCRIPTION
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This function is equivalent to the
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getnameinfo(3)
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function defined in RFC2133.
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lwres_getnameinfo() returns the
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hostname for the
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struct sockaddr sa which
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is
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salen bytes long. The hostname is of
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length
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hostlen and is returned via
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*host. The maximum length of the
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hostname is
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1025 bytes: NI_MAXHOST.
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The name of the service associated with the port number in
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sa is returned in *serv.
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It is servlen bytes long. The
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maximum length
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of the service name is NI_MAXSERV - 32
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bytes.
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The flags argument sets the
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following
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bits:
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NI_NOFQDN
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A fully qualified domain name is not required for local hosts.
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The local part of the fully qualified domain name is returned
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instead.
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NI_NUMERICHOST
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Return the address in numeric form, as if calling inet_ntop(),
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instead of a host name.
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NI_NAMEREQD
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A name is required. If the hostname cannot be found in the DNS
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and
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this flag is set, a non-zero error code is returned.
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If the hostname is not found and the flag is not set, the
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address is returned in numeric form.
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NI_NUMERICSERV
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The service name is returned as a digit string representing the
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port number.
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NI_DGRAM
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Specifies that the service being looked up is a datagram
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service, and causes getservbyport() to be called with a second
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argument of "udp" instead of its default of "tcp". This is
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required
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for the few ports (512-514) that have different services for UDP
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and
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TCP.
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RETURN VALUES
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lwres_getnameinfo()
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returns 0 on success or a non-zero error code if an error occurs.
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SEE ALSO
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RFC2133
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,
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getservbyport(3)
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,
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lwres(3)
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,
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lwres_getnameinfo(3)
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,
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lwres_getnamebyaddr(3)
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.
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lwres_net_ntop(3)
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.
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BUGS
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RFC2133 fails to define what the nonzero return values of
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getnameinfo(3)
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are.
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</body>
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