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gethostname Function in the API

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The gethostname function uses the WSALookupServiceBegin function to query SVCID_HOSTNAME as the service class GUID. If the lpszServiceInstanceName member of the WSAQUERYSET structure passed to the WSALookupServiceBegin function is NULL or references a NULL string (that is . ""), the local host is to be resolved. Otherwise, a lookup on a specified host name occurs. For the purposes of emulating gethostname the Ws2_32.dll specifies a NULL pointer for the lpszServiceInstanceName member, and specifies LUP_RETURN_NAME so that the host name is returned in the lpszServiceInstanceName member. If an application uses this query and specifies LUP_RETURN_ADDR then the host address is provided in a CSADDR_INFO structure. The LUP_RETURN_BLOB action is undefined for this query. Port information is defaulted to zero unless the lpszQueryString member of the WSAQUERYSET structure passed to the WSALookupServiceBegin function references a service such as FTP, in which case the complete transport address of the indicated service is supplied.

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