2020-11-07使用内核链表

[root@localhost tst]# dmesg
[  668.111872] --------------------------------
[  668.111875] sxs4 val4 1
[  668.111876] sxs3 val3 1
[  668.111876] sxs2 val2 1
[  668.111877] sxs1 val1 1
[  668.111877] sxs0 val0 1
[  668.111878] --------------------------------
[  668.111879] sxs3 val3 1
[  668.111879] sxs2 val2 1
[  668.111880] sxs1 val1 1
[  668.111880] sxs0 val0 1

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/list.h>

typedef struct _krc_pcr_node
{
    char * path;
    char * value;
    long long cnt;
    struct list_head list;
} node_info;

struct list_head node_list;  

int mylist_init(void)
{
    int i = 0;
    node_info *node, *cur_node;
    struct list_head *pos, *another;    
    
    INIT_LIST_HEAD(&node_list);  
    
    
    
    for (i = 0; i < 5; i++) {
        node = vmalloc(sizeof(node_info));
        memset(node, 0, sizeof(node_info));
        node->path = vmalloc(8);
        memset(node->path, 0, 8);
        sprintf(node->path, "sxs%d", i);
        node->value = vmalloc(8);
        memset(node->value, 0, 8);
        sprintf(node->value, "val%d", i);
        node->cnt++;        
        list_add( &(node->list), &node_list);
    }
    
    printk("--------------------------------\n");
    list_for_each_safe(pos, another, &node_list) {
        cur_node = list_entry(pos, node_info, list);
        printk("%s %s %lld\n", cur_node->path, cur_node->value, cur_node->cnt);
        if (!strcmp(cur_node->path, "sxs4")) {
            list_del(&(cur_node->list));
        }
    }
    
    printk("--------------------------------\n");
    list_for_each(pos, &node_list) {
        cur_node = list_entry(pos, node_info, list);
        printk("%s %s %lld\n", cur_node->path, cur_node->value, cur_node->cnt);
    }
    
    return 0;
}

void mylist_exit(void)
{
    return;
}

module_init(mylist_init);
module_exit(mylist_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("SXS");
MODULE_DESCRIPTION("List Module");
MODULE_ALIAS("List module");

obj-m+=link.o
all:
    make -C /lib/modules/$(shell uname -r)/build/ M=$(PWD) modules
clean:
    make -C /lib/modules/$(shell uname -r)/build/ M=$(PWD) clean