getprotobynumber
The Windows
Sockets getprotobynumber function gets protocol information
corresponding to a protocol number.
struct protoent FAR * getprotobynumber (
|
int number |
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); |
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Parameters
number
[in] A
protocol number, in host byte order.
Remarks
This function
returns a pointer to a protoent structure as described above in getprotobyname.
The contents of the structure correspond to the given protocol number.
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.
Return Values
If no error
occurs, getprotobynumber returns a pointer to the protoent 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. |
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WSAENETDOWN |
The network
subsystem has failed. |
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WSAHOST_NOT_FOUND |
Authoritative
Answer Protocol not found. |
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WSATRY_AGAIN |
Non-Authoritative
Protocol not found, or server failure. |
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WSANO_RECOVERY |
Nonrecoverable
errors, the protocols database is not accessible. |
|
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. |
|
WSAEINTR |
The
(blocking) call was canceled through WSACancelBlockingCall. |
See Also