[OpenWrt-Devel] [PATCH procd 3/8] Fix curses applications to work with procd

[Gert Doering]

Hi,

On Thu, Oct 02, 2014 at 02:56:18PM +0200, Michel Stam wrote:
> The problem was caused by procd not opening /dev/tty* (which ever was specified in
> /etc/inittab), causing /proc/PID/fd to point to /console instead. /dev/console is a
> non-controlling tty (CTTY), and cannot be used as one, which is exactly what curses
> applications want. Since this is very likely to cause problems with other programs,
> procd now opens /dev/tty? when the ID field of the inittab assigns one, and forces
> this to be a CTTY.

I won't claim to understand the OpenWRT intricacies here, so take this with
a grain of salt.

In traditional unix systems, setting up a tty and acquiring a controlling
tty is getty's job, and not that of the init system - and init should not
start interactive programs (or "possibly interactive programs") from 
/etc/inittab.

Changing this is fairly invasive into the way the system works and what
programs can expect regarding signal delivery etc. - like, someone pressing
ctrl-c on a tty, and a background process being started on that tty will
get a SIGINT (while it normally wouldn't).

Genuinely curious: can you explain a bit better in which cases this change
would be needed and/or beneficial?

thanks,

gert
-- 
USENET is *not* the non-clickable part of WWW!
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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