The getservbyname and getservbyport functions
query uses SVCID_INET_SERVICEBYNAME as the service class GUID. The lpszServiceInstanceName
field references a string which indicates the service name or service port,
and (optionally) the service protocol. The formatting of the string is
illustrated as "ftp/tcp" or "21/tcp" or just "ftp". The string is not case sensitive.
The slash mark, if present, separates the protocol identifier from the preceding
part of the string. The WS2_32.DLL will specify LUP_RETURN_BLOB and the NSP
will place a servent struct in the blob (using offsets instead of pointers as
described above). NSPs should honor these other LUP_RETURN_* flags as well:
||return the s_name field from servent struct in lpszServiceInstanceName.
||return canonical GUID in lpServiceClassId It is understood that a service identified either as "ftp" or "21" may in
fact be on some other port according to locally established conventions. The s_port field of the servent structure should indicate where the service can be
contacted in the local environment. The canonical GUID returned when LUP_RETURN_TYPE
is set should be one of the predefined GUIDs from svcs.h that corresponds to
the port number indicated in the servent structure.
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