More info about kobj_attribute store and show functions

[Lucas Tanure <tanure@xxxxxxxxx>]

Hi, 

I'm looking for some information about :

struct kobj_attribute {
        struct attribute attr;
        ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr, char *buf);
        ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count);
};

My function to handle the operation:

static ssize_t my_store(struct kobject *kobj, struct kobj_attribute *attr,

const char *buf, size_t count)

{

char *buffer;

buffer = (char*) kcalloc(count, sizeof(char), GFP_KERNEL);

if (count == 13) {

if (buffer) {

       copy_from_user(buffer, buf, count);

printk("A %s",buffer);

if (0) {

if (strcmp(buffer, eudyptula_id) == 0)

return count;

       printk("erro na strcmp\n");

}

else

printk("erro na copia\n");

}

}

return -EINVAL;

}

So, this const char *buf, where ti come from ? Kernel space

--

Lucas Tanure 
+55 (19) 988176559

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