Re: [TTY] exclusive mode question

[Frederik Deweerdt <dev.deweerdt@laposte.net>]

Le 09/06/05 11:59 +0200, moreau francis écrivit:
> 
> --- Frederik Deweerdt <dev.deweerdt@laposte.net> a écrit :
> 
> > I've just greped and I found :
> > 
> > if (!retval && test_bit(TTY_EXCLUSIVE, &tty->flags) &&
> > !capable(CAP_SYS_ADMIN))
> > 	retval = -EBUSY;
> > in drivers/char/tty_io.c:tty_open
> > 
> > Which sources are you looking at?
> > 
> 
> same source code but if another process has previously open the tty, how does
> this source code detect it ?
> 
Sorry I misunderstood your question, there's no check on previous opens:
from man tty_ioctl:

       TIOCEXCL  void
              Put the tty into exclusive mode.  No _further_ open(2) operations  on  the  terminal  are  permitted.
              (They will fail with EBUSY, except for root.)

Emphasis mine.
Regards,
Frederik Deweerdt
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