[GRASS5] Windows native Xdriver

[Mike Thomas]

Hi Glynn.

Thanks for the help.

> I can think of one change which might cause this. When no client is
> connected, XDRIVER no longer polls the monitor socket; instead, it
> uses select() to wait until either a client connects, or until an
> event can be read from the connection to the X server.
>
> For this to work with libW11, the descriptor returned by
> ConnectionNumber() would have to be readable according to select().
>
> Currently, libW11/w32/xlib.c has:
>
> int
> XConnectionNumber(Display* display)
> {
> int fd;
> NT_debug ("XConnectionNumber\n");
> fd = open ("/tmp/windows", O_NONBLOCK, 0);
> return 999;
> }
>
> This won't work, but returning "fd" might.

I was afraid you might say this, as I was getting nonsense from the call to
open() when I tried returning the fd instead of 999 (and also in a small
test program which I am following up in more detail).

I was hoping that this might not have been relevant to the problem, but it
seems that we have both arrived at the same place.

Cheers

Mike Thomas.