如何在驱动程序模块中使用seq_file实现可写的proc文件 [英] How to implement a writable proc file by using seq_file in a driver module

问题描述

在 Linux Device Driver 3rd ed 的书中，/proc文件系统用作输出方法来导出某个设备驱动程序的运行状态.

In the book of Linux Device Driver 3rd ed, /proc file system is used as a output method to export the running state of a certain device driver.

但是，在某些情况下，/proc文件系统用作更改驱动程序模块内部参数的一个接口.

However, in some circumstances, /proc file system is used as one interface to change the internal parameters of a driver module.

我在Google上搜索了很多东西，发现Internet上的某些实现太旧了，以至于它们使用的是create_proc_entry()而不是proc_create().

I googled a lot, and found some implementations on the Internet are too old that they used create_proc_entry() rather than proc_create().

此外，我更喜欢通过seq_file来实现(实际上，我不确定是否可以实现).我检查了seq_write()函数，却一无所获.

What's more, I'm prefer to implement this by seq_file(actually, I'm not sure is it possible). I checked the seq_write() function, and obtained nothing.

有人可以给我示范一个完成任务的例子吗? seq_file实施是更可取的.

Can anyone show me an example to finish this mission? seq_file implementation is more preferred.

推荐答案

我绑了很多东西之后.我发现实际上没有seq版本写入功能.但是，您可以将/proc文件视为普通设备文件，可以通过file_operations中定义的方法进行操作.

After I tied a lot. I found there is actually no seq version write function. However, you can treat /proc file as a normal device file which can be operated by methods defined in file_operations.

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