Bug#42986: [Konsole-devel] Bug#42986: dup2() in freebsd

[Waldo Bastian]

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On Thursday 29 August 2002 11:07 pm, Michael Samuel wrote:
> Ok, I figured it out.
>
> The dup2() it's using is from libc_r, which is the thread library on
> FreeBSD.
>
> In the libc_r wrapper, there's this code:
>
>         /* Check if the file descriptor is out of range: */
>         if (newfd < 0 || newfd >= _thread_dtablesize ||
>             newfd == _thread_kern_pipe[0] || newfd == _thread_kern_pipe[1])
> { /* Return a bad file descriptor error: */
>                 errno = EBADF;
>                 ret = -1;
>         }
>
> Any guesses what numbers are in _thread_kern_pipe[0] and
> _thread_kern_pipe[1] (which are setup shortly after setting up stdin,
> stdout and stderr)?
>
> So, when I changed PTY_FILENO to 15, it now works :)

Remarkable.

> Of course, that doesn't fix the race condition still present on all
> systems. (what happens if somebody opens the tty device before we do the
> chown, but after we open the pty master?)

I have no idea how any of this is supposed to work.

Cheers,
Waldo
- -- 
bastian at kde.org  |   SuSE Labs KDE Developer  |  bastian at suse.com
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(Complete bug history is available at http://bugs.kde.org/db/42/42986.html)