[BRLTTY] Re: More then one connection to brlapi

[Samuel Thibault]

Milan Zamazal, le Thu 24 Nov 2005 13:56:19 +0100, a écrit :
> Sorry, yet another question:
> 
> >>>>> "ST" == Samuel Thibault <samuel.thibault at ens-lyon.org> writes:
> 
>     ST> - Else (i.e. running on the linux text console), determine the
>     ST> controlling tty by looking in /proc/self/stat the major and
>     ST> minor number of the controlling tty (7th part)
> 
> Could you be more specific about how to get the information from there,
> please?  I can't identify it.

There is code for this in brltty/Programs/api_client.c:
getControllingTty(), in the #ifdef linux statement. You need to check
the major part against TTY_MAJOR, and then the minor part is the tty
number.

Mmm, thinking twice about it, a more generic way (but less prone
to succeed) would be to call stat() on STDERR_FILENO, and get the
major/minor number from there. But since stderr could be redirected, it
may fail. The problem is that I don't know any standard way to get an fd
of the controlling tty (and major/minor numbers are no standards
anyway).

Regards,
Samuel