ReadFile and other issues

eric pouech eric.pouech at
Tue Aug 21 14:58:33 CDT 2001

> I'm not sure I understand you right; are you suggesting that
> get_handle_fd should return an fd from which you can read input
> records in the case of a console?  
no, reading of input_records would be sone as it is today, with
the specific console request 'read_console_input'

> It would seem preferable to have
> get_handle_fd simply fail with a special error code saying that the
> handle is a console, and then ReadFile can fall back to using
> ReadConsoleInput which doesn't require an fd at all.
ReadFile should (if we do so) fall back to ReadConsoleA (not 
ReadConsoleInput), but it doesn't matter here

the only thing we'd have to have is another request to get the fd from
a console input handle (get_handle_fd would no longer work), and we
still need a (background) mechanism to convert the unix xterm characters
into INPUT_RECORD (a get_console_fd should do). Anyway, those fd are
even rather static (they only change on Alloc|Free Console and at
process startup if we inherit them from parent), so we can savely keep
them around, process wide

I'll try that.

> > - this type of feature would help in other areas too. For example, we
> > never check that Comm functions really get a Comm handle...
> Well, we check by the fact that we then do a serial ioctl on the fd,
> which will fail if it isn't serial. I'm not sure we need more checks.

Eric Pouech (
"The future will be better tomorrow", Vice President Dan Quayle

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