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#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kdev_t.h>
#include <linux/module.h>
static struct kobject *echo_kobj;
static ssize_t echo_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return 0;
}
static ssize_t echo_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t count)
{
ssize_t ret;
if (count > INT_MAX) {
count = INT_MAX;
}
if (strcmp (attr->attr.name, "emergency") == 0) {
ret = printk(KERN_EMERG "%*s", (int) count, buf);
} else if (strcmp (attr->attr.name, "alert") == 0) {
ret = printk(KERN_ALERT "%*s", (int) count, buf);
} else if (strcmp (attr->attr.name, "critical") == 0) {
ret = printk(KERN_CRIT "%*s", (int) count, buf);
} else if (strcmp (attr->attr.name, "error") == 0) {
ret = printk(KERN_ERR "%*s", (int) count, buf);
} else if (strcmp (attr->attr.name, "warning") == 0) {
ret = printk(KERN_WARNING "%*s", (int) count, buf);
} else if (strcmp (attr->attr.name, "notice") == 0) {
ret = printk(KERN_NOTICE "%*s", (int) count, buf);
} else if (strcmp (attr->attr.name, "info") == 0) {
ret = printk(KERN_INFO "%*s", (int) count, buf);
} else if (strcmp (attr->attr.name, "debug") == 0) {
ret = printk(KERN_DEBUG "%*s", (int) count, buf);
} else {
ret = -EINVAL;
}
return ret;
}
static struct kobj_attribute emergency_attribute =
__ATTR(emergency, 0200, echo_show, echo_store);
static struct kobj_attribute alert_attribute =
__ATTR(alert, 0200, echo_show, echo_store);
static struct kobj_attribute critical_attribute =
__ATTR(critical, 0200, echo_show, echo_store);
static struct kobj_attribute error_attribute =
__ATTR(error, 0200, echo_show, echo_store);
static struct kobj_attribute warning_attribute =
__ATTR(warning, 0200, echo_show, echo_store);
static struct kobj_attribute notice_attribute =
__ATTR(notice, 0200, echo_show, echo_store);
static struct kobj_attribute info_attribute =
__ATTR(info, 0200, echo_show, echo_store);
static struct kobj_attribute debug_attribute =
__ATTR(debug, 0200, echo_show, echo_store);
static struct attribute *echo_attributes[] = {
&emergency_attribute.attr,
&alert_attribute.attr,
&critical_attribute.attr,
&error_attribute.attr,
&warning_attribute.attr,
¬ice_attribute.attr,
&info_attribute.attr,
&debug_attribute.attr,
NULL
};
static struct attribute_group echo_attribute_group = {
.attrs = echo_attributes
};
MODULE_LICENSE("GPL");
static int __init kecho_init(void)
{
int ret;
ret = 0;
echo_kobj = kobject_create_and_add("echo", kernel_kobj);
if (echo_kobj == NULL) {
ret = -ENOMEM;
}
if (!ret)
ret = sysfs_create_group(echo_kobj, &echo_attribute_group);
if (ret)
kobject_put(echo_kobj);
return ret;
}
static void __exit kecho_cleanup(void)
{
kobject_put(echo_kobj);
}
module_init(kecho_init);
module_exit(kecho_cleanup);
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