Re: Use tcdrain() instead of tcflush() to implement FlushFileBuffers() for a COM port.

[Alexandre Julliard]

Wolfgang Walter  writes:
> @@ -2749,19 +2752,46 @@ NTSTATUS WINAPI NtFlushBuffersFile( HANDLE hFile, IO_STATUS_BLOCK* IoStatusBlock
>  {
>      NTSTATUS ret;
>      HANDLE hEvent = NULL;
> -
> - SERVER_START_REQ( flush_file )
> - {
> -
>    req->handle = wine_server_obj_handle( hFile );
> -
>    ret = wine_server_call( req );
> -
>    hEvent = wine_server_ptr_handle( reply->event );
> - enum server_fd_type type;
> - unsigned int options;
> - int needs_close;
> - int unix_handle;
> -
> - ret = server_get_unix_fd( hFile, FILE_WRITE_DATA, &unix_handle,
> -
>                          &needs_close, &type, &options );
> - if (ret) return ret;

You probably don't want to fail just because there's no unix fd.
> - if (ret == STATUS_SUCCESS && IoStatusBlock) {
> -
>    IoStatusBlock->u.Status = ret;
> }

This is an unrelated change and should be a separate patch, with tests
(also for failures cases),