Re: Console driver behaviour?

James Simmons (jsimmons@transvirtual.com)
Thu, 31 Jan 2002 16:48:07 -0800 (PST)


> How can I determine that the program is run via ssh or on
> a headless box?

Hm. I never seen a clean way to do this :-(

> The problem is with Linux Console Tools. It tries opening
> /dev/tty, /dev/tty0 and /dev/console respectively upon the
> start, and it fails on ssh'ed or headless boxes. Is there
> any way to catch the situation? I've thought that open should
> return ENODEV in these cases, but it doesn't..

/dev/console -> System console. printk messages are sent to these devices.
It is always there.

/dev/tty -> The TTY device associated with the current process

/dev/tty0 -> Only related to VTs. This is the foreground virtual
termial (made from a graphics card and a regular keyboard)

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