For mgetty users with non-trusted shell logins

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On 28 Jan 1999, Marc SCHAEFER wrote:

> l41484@alfa.ist.utl.pt wrote:
> > Wasn't aware of such a beast. Which combination is it, and where is it
> > used?
> 
> To my knowledge it's something coming from SYSV, where it could have
> been assigned to the Break (ie transmit level LOW for > 0.5 sec)
> key.

ah.

> On Linux it's the Magic SysRq + a few key strokes (like shift-control-alt-
> sysreq-f5-mouse-down-1).

Well i guess we can press it and still have one or two fingers to spare.
:-)

> However I have no idea of the state of implementation. Anyway, if
> it doesn't implement root-only-reopen it's useless (except if
> ptylogin and mgetty is also run on vcon).

I don't understand how this root-only-reopen works. Let me see how i
understand it.

fcntl to the open tty that only root can reopen.
hangup
file is closed. (refering to dev off course)
since the file has closed, the reference that it can only be reopen by
root is lost

I thought that fcntl only applies to files, and not to devices. Or you are
somehow trying to implement this at the driver level? (the one that
manages the device)

--
Tiago Pascoal  (l41484@alfa.ist.utl.pt)               FAX : +351-1-7273394
Politicamente incorrecto, e membro (nao muito) proeminente da geracao rasca.