Way to prevent SIGKILL

[karaoke_jj]

I want to make a Client-Server Application in which once a client Application is connected to Server, user at client side should not be able to terminate it unless permission is given by server.
Client side User should not be able to terminate Client Application by kill -9 <pid> or Force Quit from Activity monitor

I have trapped all other signals but not able to find a way to prevent SIGKILL to my Application ?

I want to implement this functionality on BSD UNIX system

Any help would be really great Thanks

[gerard4143]

SIGKILL can't be caught or ignored...Sorry Gerard4143

(unless you defeat the OS...)

[Cabhan]

Indeed, SIGKILL is specifically designed to be unignorable.

I guess I'm confused about why you would want this behaviour. You can still provide a signal handler for SIGKILL so as to at least notify the server that the process is dying, so it won't be an unclean shutdown. Your server will need to be able to handle suddenly-vanishing clients in any case: what if the client machine loses power or something like that?