Function kern_syscall_module_handler

freebsd/kern/kern_syscalls.c:171–218

}

int
kern_syscall_module_handler(struct sysent *sysents, struct module *mod,
    int what, void *arg)
{
	struct syscall_module_data *data = arg;
	modspecific_t ms;
	int error;

	switch (what) {
	case MOD_LOAD:
		error = kern_syscall_register(sysents, data->offset,
		    data->new_sysent, &data->old_sysent, data->flags);
		if (error) {
			/* Leave a mark so we know to safely unload below. */
			data->offset = NULL;
			return (error);
		}
		ms.intval = *data->offset;
		MOD_XLOCK;
		module_setspecific(mod, &ms);
		MOD_XUNLOCK;
		if (data->chainevh)
			error = data->chainevh(mod, what, data->chainarg);
		return (error);
	case MOD_UNLOAD:
		/*
		 * MOD_LOAD failed, so just return without calling the
		 * chained handler since we didn't pass along the MOD_LOAD
		 * event.
		 */
		if (data->offset == NULL)
			return (0);
		if (data->chainevh) {
			error = data->chainevh(mod, what, data->chainarg);
			if (error)
				return error;
		}
		error = kern_syscall_deregister(sysents, *data->offset,
		    &data->old_sysent);
		return (error);
	default:
		if (data->chainevh)
			return (data->chainevh(mod, what, data->chainarg));
		return (EOPNOTSUPP);
	}

	/* NOTREACHED */
}

int
syscall_helper_register(struct syscall_helper_data *sd, int flags)