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
              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