Function loadWinsockExtensionFunction [src]

Loads a Winsock extension function in runtime specified by a GUID.

Prototype

pub fn loadWinsockExtensionFunction(comptime T: type, sock: ws2_32.SOCKET, guid: GUID) !T

Parameters

T: typesock: ws2_32.SOCKETguid: GUID

Source

  pub fn loadWinsockExtensionFunction(comptime T: type, sock: ws2_32.SOCKET, guid: GUID) !T {
    var function: T = undefined;
    var num_bytes: DWORD = undefined;

    const rc = ws2_32.WSAIoctl(
        sock,
        ws2_32.SIO_GET_EXTENSION_FUNCTION_POINTER,
        &guid,
        @sizeOf(GUID),
        @as(?*anyopaque, @ptrFromInt(@intFromPtr(&function))),
        @sizeOf(T),
        &num_bytes,
        null,
        null,
    );

    if (rc == ws2_32.SOCKET_ERROR) {
        return switch (ws2_32.WSAGetLastError()) {
            .WSAEOPNOTSUPP => error.OperationNotSupported,
            .WSAENOTSOCK => error.FileDescriptorNotASocket,
            else => |err| unexpectedWSAError(err),
        };
    }

    if (num_bytes != @sizeOf(T)) {
        return error.ShortRead;
    }

    return function;
}  