table of contents
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 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
NI_NUMERICHOST
NI_NAMEREQD
NI_NUMERICSERV
NI_DGRAM
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 © 2000, 2001, 2004, 2005, 2007, 2014-2016, 2018 Internet Systems Consortium, Inc. ("ISC")
2007-06-18 | ISC |