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15_sysfsLinux内核模块

news 来源：原创 2025/5/11 2:28:40

01_basicLinux内核模块_the kernel was built by-CSDN博客文章浏览阅读989次，点赞3次，收藏3次。环境ID=ubuntuMakefilemodules:clean:basic.creturn 0;运行效果。_the kernel was built byhttps://blog.csdn.net/m0_37132481/article/details/136157384

环境

root@auto:/media/sf_D_DRIVE/kmodule/15_sysfs# cat /etc/os-release
PRETTY_NAME="Ubuntu 24.04.1 LTS"
NAME="Ubuntu"
VERSION_ID="24.04"
VERSION="24.04.1 LTS (Noble Numbat)"
VERSION_CODENAME=noble
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=noble
LOGO=ubuntu-logo

mysysfs.c

root@auto:/media/sf_D_DRIVE/kmodule/15_sysfs# cat mysysfs.c
#include <linux/module.h>
#include <linux/kobject.h>// implement ref:kernel/ksysfs.c
#define TAG "hello# "static struct kobject *hello_kobj;static ssize_t hello1_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{return sprintf(buf, "%s\n", __func__);
}static ssize_t hello1_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count)
{return count;
}static struct kobj_attribute hello_attr1 = {.attr = {.name = "hello1",.mode = 0777},.show = hello1_show,.store = hello1_store
};static struct attribute * hello_attrs[] = {&hello_attr1.attr,{},
};static const struct attribute_group hello_attr_group = {.attrs = hello_attrs,
};static int mysysfs_init(void)
{int error;printk(TAG "%s called\n", __func__);hello_kobj = kobject_create_and_add("hello", NULL);if (!hello_kobj) {error = -ENOMEM;goto exit;}error = sysfs_create_group(hello_kobj, &hello_attr_group);if (error)goto kset_exit;return 0;
kset_exit:kobject_put(hello_kobj);
exit:return error;
}static void mysysfs_exit(void)
{printk(TAG "%s called\n", __func__);sysfs_remove_group(hello_kobj, &hello_attr_group);kobject_put(hello_kobj);
}module_init(mysysfs_init);
module_exit(mysysfs_exit);MODULE_LICENSE("GPL");

效果