lwres_getnameinfo (3) - Linux Man Pages
lwres_getnameinfo: lightweight resolver socket address structure to hostname and service name
lwres_getnameinfo - lightweight resolver socket address structure to hostname and service name
int lwres_getnameinfo(const struct sockaddr
*sa, size_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags);
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:
- A fully qualified domain name is not required for local hosts. The local part of the fully qualified domain name is returned instead.
- Return the address in numeric form, as if calling inet_ntop(), instead of a host name.
- 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.
- The service name is returned as a digit string representing the port number.
- 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.
RFC2133 fails to define what the nonzero return values of getnameinfo(3) are.
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