[系统运维]linux sys节点创建

static ssize_t display_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
    //unsigned long val;
    //if (kstrtoul(buf, 10, &val))
    //    return -EINVAL;
    pr_err("displayd write debug buf\n");
    return count;
}

static ssize_t display_show(struct device *dev, struct device_attribute *attr, char *buf)
{
    pr_err("displayd read debug buf\n");
    return 0;
}
static DEVICE_ATTR(displayd, 0660, display_show, display_store);

static int init_sys_node()
{
   int ret;
    struct kobject *kobj = kobject_create_and_add("displayd_debug", NULL);
    if(kobj == NULL){
        return -ENOMEM;
    }

    ret = sysfs_create_file(kobj, &dev_attr_displayd.attr);
    
    if(ret < 0) {
        return -1;
    }
    return ret;
}

调用init_sys_node 函数即可创建文件节点：/sys/displayd_debug/displayd

next：sysfs_create_group批量创建sys文件节点.