gethostbyaddr Function in the SPI
The WSALookupServiceBegin query uses SVCID_INET_HOSTNAMEBYADDR as the service class GUID. The host address is supplied in lpszServiceInstanceName as a dotted internet string (for example, 192.9.200.120). The Ws2_32.dll specifies LUP_RETURN_BLOB and the NSP places a HOSTENT structure in the blob (using offsets instead of pointers as described above). NSPs should honor these other LUP_RETURN_* flags as well.
| Flag |
Description |
| LUP_RETURN_NAME |
Returns the h_name member from HOSTENT structure in lpszServiceInstanceName. |
| LUP_RETURN_ADDR |
Returns addressing information from HOSTENT in CSADDR_INFO structures, port information is defaulted to zero. |