lwres_getnameinfo man page on YellowDog
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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 Internet Systems Consortium, Inc. ("ISC")
BIND9 Jun 30, 2000 LWRES_GETNAMEINFO(3)
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