[Asterisk-Dev] ast_hangup

[Martin Bangiev]

Hi guys,
I'm trying to write a simple application that hang's up the chanel in 
few seconds but I have a problem. When the application returns asterisk 
crashes with Segmentation Fault. Here is the source (pretty simple)

static int myhangup_exec(struct ast_channel *chan, void *data) {
        struct localuser *u;

        LOCAL_USER_ADD(u);
        sleep(3);
        ast_hangup(chan);
        LOCAL_USER_REMOVE(u);
        return(0);
}

Can you pelase tell me what the proper use of ast_hangup is?
Thanks in advance.