gethostbyaddr

The Windows Sockets gethostbyaddr function gets host information corresponding to an address.

struct hostent FAR * gethostbyaddr (

const char FAR * addr,
int len,
int type
);

Parameters

addr

[in] A pointer to an address in network byte order.

len

[in] The length of the address.

type

[in] The type of the address.

Remarks

gethostbyaddr returns a pointer to the following hostent structure which contains the name(s) and address which correspond to the given address. All strings are null terminated.

Return Values

If no error occurs, gethostbyaddr returns a pointer to the hostent structure described above. Otherwise, it returns a NULL pointer and a specific error number can be retrieved by calling WSAGetLastError.

Error Codes

WSANOTINITIALISED	A successful WSAStartup must occur before using this function.
WSAENETDOWN	The network subsystem has failed.
WSAHOST_NOT_FOUND	Authoritative Answer Host not found.
WSATRY_AGAIN	Non-Authoritative Host not found, or server failed.
WSANO_RECOVERY	Nonrecoverable error occurred.
WSANO_DATA	Valid name, no data record of requested type.
WSAEINPROGRESS	A blocking Windows Sockets 1.1 call is in progress, or the service provider is still processing a callback function.
WSAEAFNOSUPPORT	The type specified is not supported by the Windows Sockets implementation.
WSAEFAULT	The addr argument is not a valid part of the user address space, or the len argument is too small.
WSAEINTR	The (blocking) call was canceled through WSACancelBlockingCall.

See Also

gethostbyname, hostent, WSAAsyncGetHostByAddr

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