From owner-cvs-all  Mon Jun 11  2: 8:58 2001
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From: Poul-Henning Kamp <phk@FreeBSD.org>
Date: Mon, 11 Jun 2001 02:08:52 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/kern tty_pty.c
X-FreeBSD-CVS-Branch: RELENG_4
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phk         2001/06/11 02:08:52 PDT

  Modified files:        (Branch: RELENG_4)
    sys/kern             tty_pty.c 
  Log:
  MFC:
         With the new kernel dev_t conversions done at release 4.X,
         it becomes possible to trap in ptsstop() in kern/tty_pty.c
         if the slave side has never been opened during the life of a kernel.
  
         What happens is that calls to ttyflush() done from ptyioctl() for the
         controlling side end up calling ptsstop() [via (*tp->t_stop)(tp, <X>)]
         which evaluates the following:
  
               struct pt_ioctl *pti = tp->t_dev->si_drv1;
  
         In order for tp->t_dev to be set, the slave device must first be
         opened in ttyopen() [kern/tty.c].
  
         It appears that the only problem is calls to (*tp->t_stop)(tp, <n>),
         so this could also happen with other ioctls initiated by the
         controlling side before the slave has been opened.
  
  Revision  Changes    Path
  1.74.2.2  +2 -1      src/sys/kern/tty_pty.c


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