gethostbyaddr
This function retrieves the host information corresponding to a network address.
struct hostent FAR* gethostbyaddr(
const char FAR* addr,
int len,
int type
);
Parameters
- addr
[in] Pointer to an address in network byte order. - len
[in] Length of the address. - type
[in] Type of the address, such as the AF_INET address family type (defined as TCP, UDP, and other associated Internet protocols). Address family types and their corresponding values are defined in the winsock2.h header file.
Return Values
If no error occurs, this function returns a pointer to the hostent structure that contains the name and address corresponding to the given network address. If an error occurs, it returns a NULL pointer, and a specific error code can be retrieved by calling WSAGetLastError.
The following table shows a list of possible error codes.
| Error code | Description |
|---|---|
| WSANOTINITIALISED | A successful WSAStartup call must occur before using this function. |
| WSAENETDOWN | The network subsystem has failed. |
| WSAHOST_NOT_FOUND | An authoritative answer host was not found. |
| WSATRY_AGAIN | A nonauthoritative host was not found, or the server failed. |
| WSANO_RECOVERY | A nonrecoverable error occurred. |
| WSANO_DATA | A valid name exists, but no data record of the requested type exists. |
| WSAEINPROGRESS | A blocking Winsock 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 parameter is not a valid part of the user address space, or the len parameter is too small. |
| WSAEINTR | The socket was closed. |
Requirements
OS Versions: Windows CE 1.0 and later.
Header: Winsock2.h.
Link Library: Ws2.lib.
See Also
gethostbyname | hostent | WSAGetLastError | WSAStartup
Last updated on Saturday, April 10, 2004
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