1 files changed, 70 insertions, 0 deletions
diff --git a/sem1/osc/mm1/mm1/jmod.c b/sem1/osc/mm1/mm1/jmod.c
new file mode 100644
index 0000000..a07077c
--- /dev/null
+++ b/sem1/osc/mm1/mm1/jmod.c
@@ -0,0 +1,70 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <asm/uaccess.h>
+
+static int major_num;
+static int busy;
+
+
+static int cool_open(struct inode *inode, struct file *file) {
+	/* Check if we are already serving someone */
+	if (busy) {
+		return -EBUSY;
+	}
+
+	busy = 1;
+	return 0;
+}
+
+static int cool_release (struct inode *inode, struct file *file) {
+	busy = 0;
+
+	return 0;
+}
+
+static ssize_t cool_read (struct file *filp, char *buffer, size_t len, loff_t *offset) {
+
+	char str[12] = "hej med dig";
+	int i;
+
+	for (i = 0; i < len; i++) {
+		put_user(str[i % 12], buffer++);
+	}
+
+	return i;
+}
+
+static struct file_operations file_ops = {
+	.owner = THIS_MODULE,
+	.read = cool_read,
+	.open = cool_open,
+	.release = cool_release
+};
+
+static int __init jmod_init(void) 
+{
+	printk(KERN_INFO "COOL_MODULE: Registering cooldev\n");
+	
+	major_num = register_chrdev(0, "cooldev", &file_ops);
+	if (major_num < 0) {
+		printk(KERN_ERR "COOL_MODULE: Could not register major\n");
+		return 1;
+	}
+
+	printk(KERN_INFO "COOL_MODULE: Got major %d\n", major_num);
+
+	return 0;
+}
+
+
+static void __exit jmod_exit(void) 
+{
+	printk(KERN_INFO "COOL_MODULE: Nou moe\n");
+	unregister_chrdev(major_num, "cooldev");
+}
+
+module_init( jmod_init );
+module_exit( jmod_exit );
+