Re: Not able to know the device is alive or not after rebooting...

From: Arjen Markus (arjen.markus_at_wldelft.nl)
Date: 02/02/05 

Date: Wed, 02 Feb 2005 16:11:22 +0100

Puneet wrote:
>
> Ok I tell in detail,
>
> - I am just spawn on that device and issuing the reboot command.
> - after issuing command devies has been rebooted.
> - reboot time not fixed it can varied.
> - but i am doing all these stuffs via tcl code. now i want to know that
> device (ip address) is alive or not (alive when device is up) through
> my code.
> so how i know that it is alive or not. Shell i do ping every time
> that ip address. or as you suggest and i also think that we can through
> a process in background of shell that ping that ip and whenever ip is
> enable it ends that process automatically.
>

ping can be run to see if the addressee is alive and then finish, right?
Then the sketch of a script that Chris gave (and my example when
properly
debugged :)) should give you a solution.

> For doing this thing i hear about fileevent utility in tcl but i dont
> able to understand how to use it. If you know some another way , please
> explain me with example :-)
>

fileevent does wonders, but it requires a socket or pipe that is alive.
During reboot there will be no such thing possible. So, you have to
try to connect, for instance, via ping - if that fails, the machine
is not up yet. If it succeeds, then you know it is up.

There is nothing fileevent can usefully do in these circumstances.

But for examples: see the Wiki - there are plenty of scripts that
use it out there - http://wiki.tcl.tk/880 discusses the command
as such.

Regards,

Arjen

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