INFO: How Database WinSock APIs Are Implemented in Win NT 3.5

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Following are the steps taken by each API. In a case where more than one step may be taken to resolve the requested information, the process is not carried to the next step if the information is resolved in the current step.

gethostbyname():

1. Check the HOSTS file at %SystemRoot%\System32\DRIVERS\ETC.
2. Do a DNS query if the DNS server is configured for name resolution.
3. Query one or more WINS servers.

gethostbyaddr():

1. Check the HOSTENT cache.
2. Check the HOSTS file at %SystemRoot%\System32\DRIVERS\ETC.
3. Do a DNS query if the DNS server is configured for name resolution.
4. Do an additional NetBIOS remote adapter status to an IP address for its NetBIOS name table. This step is specific only to the Windows NT version 3.51 implementation.

getprotobyname() and getprotobynumber():

1. Check the PROTOCOL file at %SystemRoot%\System32\DRIVERS\ETC.

getservbyname() and getservebynumber():

1. Check the SERVICES files at %SystemRoot%\System32\DRIVERS\ETC.