rem: static int xl_get_pid(struct sip_msg *msg, str *res)
add: static int xl_get_pid(struct sip_msg *msg, str *res, str *hp, int hi)
context: static int xl_get_pid(struct sip_msg *msg, str *res){	int l = 0;	char *ch = NULL;	if(msg==NULL || res==NULL)		return -1;	if(cld_pid == 0)		cld_pid = (int)getpid();	ch = int2str(cld_pid, &l);	res->s = ch;	res->len = l;	return 0;}