gethostbyname
The Windows Sockets
gethostbyname function gets host information corresponding to a hostname.
struct hostent FAR * gethostbyname (
Parameters
name
[out] A pointer to the null terminated name of the host.
Remarks
gethostbyname returns a pointer to a
hostent structure. The contents of this structure correspond to the hostname
name.
The pointer which is returned points to a structure which is allocated by
Windows Sockets. The application must never attempt to modify this structure or to
free any of its components. Furthermore, only one copy of this structure is
allocated per thread, and so the application should copy any information which it
needs before issuing any other Windows Sockets function calls.
gethostbyname does not resolve IP address strings passed to it. Such a request is treated
exactly as if an unknown host name were passed. An application with an IP address
string to resolve should use
inet_addr to convert the string to an IP address, then
gethostbyaddr to obtain the hostent structure.
gethostbyname will resolve the string returned by a successful call to
gethostname.
Return Values
If no error occurs,
gethostbyname 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 failure.
|
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.
|
WSAEFAULT
| The name argument is not a valid part of the user address space.
|
WSAEINTR
| The (blocking) call was canceled through WSACancelBlockingCall.
|
See Also
gethostbyaddr,
WSAAsyncGetHostByName
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