kobject_uevent_env小例子

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
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#include
#include
#include
#include


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->kobj, KOBJ_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 = {
        .attrs = (struct attribute **) song_event_attr,
};


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


static int __init song_uevent_init(void)
{
int ret = 0;
ret = class_register(&song_event_class);
if (ret < 0) {
printk(KERN_ERR "song_event: class_register fail\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);
if(ret < 0) {
printk(KERN_ERR "song_event:sysfs_create_group fail\r\n");
return ret;
}
} else {
printk(KERN_ERR "song_event:device_create fail\r\n");
ret = -1;
return ret;
}


return 0;
}
module_init(song_uevent_init);
MODULE_AUTHOR("");
MODULE_DESCRIPTION("song self event driver");
MODULE_LICENSE("GPL");