child processes not responding to HUP signal when parent running in BG

Hi,

I have a script working as TCP socket server.

It is forking child processes. These child processes are using system
commands also.
As some point of time, I need to kill all the processes running under main
processes.

and I am using following piece of code for that Which means to Hang up all
sub processes.

        {
        local $SIG{HUP} = 'IGNORE';
        $cnt= kill HUP => -$$;
        print "$cnt returned by kill\n";
        }


It works find till the server is running in foreground. But The server is
running in the background, it stops responding to these interrupts. and I
have to run the server in the background according to the requirement,

Please help with some solution,

Thanks,

Pratibha.

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