lwres_getnameinfo man page on FreeBSD

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LWRES_GETNAMEINFO(3)		     BIND9		  LWRES_GETNAMEINFO(3)

NAME
       lwres_getnameinfo - lightweight resolver socket address structure to
       hostname and service name

SYNOPSIS
       #include <lwres/netdb.h>

       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
       sockaddr sa 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.

COPYRIGHT
       Copyright © 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
       Copyright © 2000, 2001 Internet Software Consortium.

BIND9				 Jun 30, 2000		  LWRES_GETNAMEINFO(3)
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