waiting prosun
On Mon, 14 Feb 2005 08:08:50 +0530, Rajiv Lodha <[EMAIL PROTECTED]> wrote:
instead of "C" program, you can write a unix shell script ... make a smart use of CRON(TAB), we used to do this with our fellow students at our institue.
but instead of 1 hr ... we did the same for 1 min ;-)
He He He.
rajiv
On Mon, 14 Feb 2005 05:16:29 +0530, Anshul <[EMAIL PROTECTED]> wrote:On Sun, 13 Feb 2005 13:09:21 +0530, Manas Laha
<[EMAIL PROTECTED]> wrote:
>
> Abhijit Banerjee wrote:
>
> >prosun try this
> >in bashrc add at the end
> >
> >sleep 3600
> >logout
> >
> >
> Won't work, unfortunately! All this will do is block the terminal for
> one hour and then log the user out. Not quite what Prosun desires.
>
> Also, any modifications made to the user's .bashrc or .bash_profile can
> be undone by the user any time in the one hour available to him. So, the
> modifications should be made to the system-wide /etc/profile file. This
> file, along with the user's own .bash_profile and .bashrc are read in
> during every login.
>
> Here's an outline of what _probably_ has to be added in /etc/profile in
> order to achieve what Prosun desires:
>
> 1. The process-id of the user's login shell has to be obtained.
> 2. A shell script has to be started in the background and given this
> process-id. This background process will sleep for 1 hr (Abhijit's sleep
> 3600) and, on waking up, will kill the process whose process-id it knows.
>
> Even then, clever users may be able to get around this.
>
> Would others like to share their ideas too?
>
> - Manas Laha
>
Maybe one should write a small C program to do 2 and make it suid 755 and call it from etc profile. That will be beyond the users manipulation.
etc profile can easily find the id using 'id -u'
(A more professional design for a web kiosk operation could use a modified code of xscreensaver and call it from etc profile in the above way to lock the screen instead of logging a user out, so that you could remotely authorize and record a second hour! )
Anshul
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