kobj_change

#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/semaphore.h>
#include <linux/mutext.h>
#include <asm/unistd.h>
#include <asm/uaccess.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/device.h>
#include <linux/kdev_t.h>
#include <linux/i2c.h>
#include <linux/input.h>

struct device *dev = NULL;
char *s_c[2];

static ssize_t send(struct device* dev, struct device_attribute *attr, const char *buf, size_t count)
{
    s_c[0] = "song_hello";
    s_c[1] = NULL;
    kobject_uevent_env(&dev->kobject, KOBJECT_CHANGE, s_c);
    return count;
}

static DEVICE_ATTR(S, S_IRUGO|S_IWUSR, NULL, send);

static const struct attribute *song_event_attr[] = {
    &dev_attr_S.attr,
    NULL,
};

static const struct attribute_group song_event_attr_group = {
    .attr = (struct attribute **) song_event_attr,
};

static struct class song_event_class = {
    .name = "song_event",
    .owner = THIS_MODULE,
};

static int __init song_uevent_init(void)
{
    ret = 0;
    ret = class_register(&song_evnent_class);
    if (ret < 0) 
    {
        printk(KERN_ALERT "song_event: class register failed\n");
        return ret;
    }

    dev = device_create(&song_event_class, NULL, MKDEV(0, 0), NULL, "song_event");
    
    if (dev) {
        ret = sysfs_create_group(&dev->kobj, &song_event_attr_group);
        return ret;
    }else {
        printk(KERN_ALERT "song_event: device_create failed\n");
        return ret;
    }

    return 0;
}

module_init(song_uevent_init);

  

网上看到的一个程序，在/sys/class/song_event/song_event创建相应的文件结构

问题是KOBJ_CHANGE, 在应用空间哪儿接收的呢？

“song_hello” 又在哪儿？

 

-------------------------------------------------------------------------

分隔

-------------------------------------------------------------------------