内核进程如何异步发送一些数据到用户级进程
我在一次采访中被问到这个问题。但我唯一能想到的就是分配一个共享内存段，并通过某种方式将内核和用户级进程写入该段。即使我对这个答案不满意。有人可以吗请解释一些其他机制来做到这一点？ 任何帮助将不胜感激。
问候，
I was asked this question in an interview.But the only thing I could think of is allocating a shared memory segment and by some means both kernel and user level processes to write to that segment.Even I am not satisfied with that answer.Can someone please expalin some other mechanism to do so?
Any help will be appreciated.
Regards,
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我认为他们可能想了解 NetLink 接口。该接口为内核进程和用户进程提供了一个API，通过它看起来就像一个套接字，并且被认为是ioctl的继承者，它更易于使用和异步。
此处概述：http://www.linuxjournal.com/article/7356
I would think they probably wanted to hear about the NetLink Interface. This interface provides an API for a kernel process and user process to communicate through which looks just like a socket, and is considered a successor to ioctl which is easier to use and asynchronous.
Overview here: http://www.linuxjournal.com/article/7356
他们可能想了解 APC (异步过程调用）。
They probably wanted to hear about APC (Asynchronous Procedure Call).
使用 proc 文件作为消息传递机制怎么样？它可以从内核和用户空间访问吗？
How about having a proc file as message passing mechanism. It can be accessible from both kernel and user space?