HW1

Makefile

@@ -0,0 +1,9 @@
+obj-m := sample.o
+PWD := $(shell pwd)
+KERNEL_VERSION := $(shell uname -r)
+KERNEL_DIR := /usr/src/linux-headers-$(KERNEL_VERSION)/
+all:
+	make -C $(KERNEL_DIR) M=$(PWD) modules
+
+clean:
+	make -C $(KERNEL_DIR) M=$(PWD) clean

sample.c

@@ -0,0 +1,68 @@
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+
+struct birthday
+{
+    int day;
+    int month;
+    int year;
+    struct list_head list;
+};
+
+static LIST_HEAD(birthday_list);
+
+/* This function is called when the module is loaded. */
+
+int sample_init(void)
+{
+    printk(KERN_INFO "Loading Module\n");
+
+    struct birthday *person;
+    int i = 0;
+
+    for (i = 0; i < 5; i++)
+    {
+        person = kmalloc(sizeof(*person), GFP_KERNEL);
+        person->day = 2;
+        person->month = 8 + i ;
+        person->year = 1995 + i;
+
+        INIT_LIST_HEAD(&person->list);
+        list_add_tail(&person->list, &birthday_list);
+    }
+
+    list_for_each_entry(person, &birthday_list, list)
+    {
+        printk(KERN_INFO "Birthday: %1d/%1d/%1d\n", person->year, person->month, person->day);
+    }
+
+    printk(KERN_INFO "Module Loaded\n");
+    return 0;
+}
+
+/* This function is called when the module is removed. */
+
+void sample_exit(void)
+{
+    printk(KERN_INFO "Removing Module\n");
+    struct birthday *person, *next;
+
+    list_for_each_entry_safe(person, next, &birthday_list, list)
+    {
+        list_del(&person->list);
+        kfree(person);
+    }
+
+    printk(KERN_INFO "Module Removed\n");
+}
+
+/* Macros for registering module entry and exit points. */
+module_init(sample_init);
+module_exit(sample_exit);
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Sample Module");
+MODULE_AUTHOR("SGG");