Linux

Hi to all.
My first message here, but i following you via twitter feed from many time...

The question:
I need to delay 5-10 seconds the shutdown command executed when the user click on the power off/reboot in their session or at login screen.

I need that because i have in the background a process that need to comunicate with a remote MySQL server login or logout of the users. In the normal case the shutdown process bring the network interface down before the local script can set a new logout record on DB.

I don't know what gnome execute when system is halted o rebooted.

I have tried this solution:
mv /sbin/shutdown /sbin/shutdown.bin

pico /sbin/shutdown

Code:

sleep 10
/sbin/shutdown.bin "$1" "$2" "$3" "$4" "$5"

...but strangely the system wait 10 seconds then reboot even when i call shutdown from gnome...

Any help is greatly appreciated

Greetings from Italy.

If you strace the gnome into a file, you might find a point more upstream and effective.

Once you find it, you can create an IPC dialog of some sort to ensure the logout is in the DB.

Otherwise, have a server poll for logged in processes and log when they disappear, from the DB end.

Maybe MySQL has a facility when connections are made and broken that can or does log this.

How can i (s)trace what gnome do when call shutdown, the point is that need to intercept this signal, delay, then execute original signal...

How is your background process started, and how do you signal it to log out? Maybe a service script in /etc/init.d (with appropriate entries in the required runlevel(s)) would solve your problem better than tinkering with shutdown.

The script is launched via event.d (ubuntu 10.04)

/etc/init/checkuser.conf

Code:

description     "checkuser"
start on runlevel [2345]
respawn
exec /var/scripts/checkusers.sh

How can manage the shutdown of Pc making sure that this script report to mysql the logout of the user before shuttingdown?

I'm not that fit with upstart, but as far as I know the MySQL startup script can be made a dependency of your script. I think (but not sure) that the line should be something like this:

Code:

start on net-device-up IFACE=eth0 #example
stop on runlevel [01S6]

This should start your script as soon as the network interface becomes available, and stop it when the system starts to shutdown/reboot.

ok,
currently don't have declared any stop @ runlevel for this process.

The script must have the time to intercept the disconnection of 'user, which normally happens at shutdown.

At this point we think we need to play with the times, allowing the script to understand that the 'user is no longer connected and communicate to the MySQL server, the first turning off or disable the' network interface

Remember, the script generates a loop that repeats every three seconds to 'inside of which are recognized as the users who are connected or disconnected .. and communicates with mysql..