UNIX for Advanced & Expert Users

Hello folks,

Have a process which needs to lock files to prevent simultaneous access.
I could catch Ctrl + C, etc signals via the trap command.

Often sessions get hung due to network disconnect leaving the lock file in place.
Is there a way to catch network disconnects, etc.

Thanks in advance

---------- Post updated at 09:08 PM ---------- Previous update was at 04:55 PM ----------

Request admins to move it to Expert section.
Mistakenly it got submitted here.

Moved it for you, thanks for asking instead of duplicating.

How to detect it depends on what you've done. How are these processes created? Do users launch them from an ssh session? etc.

If they're launched from inside an SSH session, I'd expect them to be killed with SIGHUP when the session closes. If you've blocked that, that may be the reason they don't die.

Yes they are launched from an SSH session.

Let me try capturing the SIGHUP.
Will update soon.

Do you guys read each & every thread?
How did you manage to find the request in middle of a post

You want it to NOT be captured, so when it happens, the process gets killed.

You could trap it and take extra measures to kill the process when it happens, though, if ordinary SIGHUP won't do it. A line in their profile or somesuch.

It was pretty simple.
Just caught the SIGHUP & cleaned up the lock.

So many signals in UNIX.
Thanks for the help