initial commit

this is a simple try of unuseful code in kernel space, debugfs is
used to create a dir and a file

1 files changed, 46 insertions, 0 deletions

diff --git a/main.c b/main.c
new file mode 100644
index 0000000..6a65f3c
--- /dev/null
+++ b/main.c
@@ -0,0 +1,46 @@
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/string.h>
+/* used for kmalloc */
+#include <linux/slab.h>
+
+#include <debug.h>
+
+char *debugmsg = "Tesla coil is a hi freq transformer";
+struct dentry *debug_dir = NULL;
+struct dentry *debug_file = NULL;
+
+/* __init is a hint that the func is only used at initialization time, then module
+ * loader drops the function after module is loaded making its memory available for other uses
+ */
+static int __init hello_init(void)
+{
+    int err = 0;
+    char *msg = (char *) kmalloc_array(128, sizeof(char), GFP_KERNEL /* kernel ram */);
+
+    printk("module named hello inserted\n");
+    strcpy(msg, "photon is the energy carrier particle for EM waves within light spectrum");
+    printk("%s\n", msg);
+    kfree(msg);
+
+    /* modifies passed in ptrs */
+    err = debug_init(&debug_dir, &debug_file);
+    if (err)
+        printk("debugfs might not have been mounted\n");
+
+    return 0;
+}
+ 
+static void __exit hello_exit(void)
+{
+    debug_destroy(debug_dir, debug_file);
+    printk("module named hello removed\n");
+}
+
+module_init(hello_init);
+module_exit(hello_exit);
+
+MODULE_LICENSE("GPL");
+