Re: [BProc] BProc & /dev/tty - anything to watch out?

[Wilton W. <ww...@ha...>]

Try putting the setgpid callbefore the setsid call.. that I think  will at
least fix the bash error, but won't do anything about controlling tty..
setsid() and stuff is mostly voodoo magic as fas as I am concernerd.. 

- Wilton

On Thu, 16 May 2002, Erik Arjan Hendriks wrote:

> On Tue, May 14, 2002 at 05:30:22PM +0200, ha...@no... wrote:
> > Dear BProc users and gurus,
> > 
> > I am trying to setup occasional master->slave OpenSSH access (just for
> > the convenience of environment, pty etc. during service work on slave
> > node).
> > 
> > It works but it cannot use controlling tty. Server process complains:
> > 
> >  n1 sshd[19675]: error: ioctl(TIOCSCTTY): Operation not permitted 
> >  n1 sshd[19675]: error: open /dev/tty failed - could not set controlling tty: No such device or address 
> > 
> > and client process complains:
> > 
> >  bash: initialize_job_control: setpgid: Operation not permitted
> > 
> > Then it works OK, just job control is missing. Server process is able
> > to use /dev/ptmx to allocate /dev/pts/0, it opens /dev/tty but then it
> > is unable to use it. This seemes strange to me.
> > 
> > At this moment I am not sure whether I should continue looking for
> > missing files, kernel modules etc. on slave node (usual game when you
> > insist on running some daemon :-) or delve into kernel sources and
> > look for strange interactions of BProc and controlling tty.
> > 
> > So, my only question is: Is it likely that controlling terminal things
> > are a bit broken in BProc patched kernel?
> 
> I think the odds of some of the tty stuff being busted are very good.
> The TTY code is another chunk of kernel code which deals in process
> groups that I haven't modified for BProc.
> 
> The setpgid call *should* work as usual but it's possible that it's
> getting screwed up by earlier errors or it's just broken.  The process
> group rules are pretty arcane and I don't know exactly how they're
> supposed to work.
> 
> > Just give me some opinions to let me search in more likely
> > directions...
> 
> Personally, I'd hunt down the TTY issue before worrying about the
> process group thing.  There's almost certainly some brokeness in
> there.
> 
> - Erik
> -- 
> Erik Arjan Hendriks          Printed On 100 Percent Recycled Electrons
> er...@he...                   Contents may settle during shipment
> 
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