在debugfs中实现读取操作列表 [英] implement a read operation list in debugfs

问题描述

我正在实现一个内核模块.使用几种技术. 其中之一是对不同的模块变量进行读/写. 我能够读取/写入所有变量，但我模块中的列表除外. 链接列表:

i'm implementing a kernel module. using several techniques. 1 of them is to give read/write to different module variables. i was able to read/write all variables except the list i have in my module. the linked list:

    static struct node {
        struct list_head list;
        unsigned int x;
        struct tm time;
    };

我希望在debugfs中有一个相应的文件，该文件将打印完整列表. 我尝试了所有的简单"读取功能，但是它们都没有真正起作用..:(

i would like to have a corresponding file in debugfs that will print the full list. i tried all the 'simple' read functions , but none of them actually work.. :(

推荐答案

您可以使用与此功能类似的功能来阅读列表:

You can read list using function similar to this one:

struct k_list {                                                                 
        struct list_head links;                                                     
        int data;                                                                   
};                                                                              

struct k_list my_list;

static ssize_t pop_queue(struct file * file,                                       
                                char *buf,                                         
                                size_t count,                                      
                                loff_t *ppos)                                      
{                                                                                  
        struct list_head *pos, *q;                                                 
        struct k_list *tmp;                                                        

        printk(KERN_INFO "--Listing inserted numbers--");                          
        list_for_each_safe(pos, q, &my_list.links) {                               
                tmp = list_entry(pos, struct k_list, links);                       
                printk(KERN_INFO "object: %d ", tmp->data);                        
        }                                                                          
        printk(KERN_INFO "--End of list--");                                       

        return count;                                                              
} 

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