如何停止监控文件路径

Question

我正在使用此函数监视来自具有objective-c的数组的多个文件路径：

-(void)monitorPath:(NSString*)path{
    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    int fildes = open([path UTF8String], O_EVTONLY);

    __block typeof(self) blockSelf = self;
    __block dispatch_source_t source = dispatch_source_create(DISPATCH_SOURCE_TYPE_VNODE, fildes,
                                                              DISPATCH_VNODE_DELETE | DISPATCH_VNODE_WRITE | DISPATCH_VNODE_RENAME, queue);
    dispatch_source_set_event_handler(source, ^{
        unsigned long flags = dispatch_source_get_data(source);
            NSLog(@"Path altered");
    });
    dispatch_source_set_cancel_handler(source, ^(void) {
        close(fildes);
    });
    dispatch_resume(source);
}

是否有一种方法可以阻止所有文件路径被监控？