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kudo.c

@@ -9,14 +9,16 @@ int main(int argc, char **argv){
 
      FILE *fptr;
 
-    // Open a file in writing mode
+    // Open the file in writing mode
     fptr = fopen("/proc/kudo_interface", "w");
 
+    // Make sure the file opened
     if (fptr == NULL){
         fprintf(stderr, "Insufficient Permissions.\n");
         return 1;
     }
 
+    // Write all arguments to the file
     for (int i = 1; i < argc; i++){
         fprintf(fptr, "%s", argv[i]);
         fprintf(fptr, " ");

kudo_mod.c

@@ -1,31 +1,38 @@
+// Includes
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/module.h>
 
 #include <linux/proc_fs.h>
 #include <linux/vmalloc.h>
 
+// Predeclares
 ssize_t kudo_read(struct file *file, char __user *user, size_t size, loff_t *off);
 ssize_t kudo_write(struct file *file, const char __user *user, size_t size, loff_t *off);
 
+// The Global Proc File Reference
 static struct proc_dir_entry *kudo_proc = NULL;
 
+// On Read
 ssize_t kudo_read(struct file *file, char __user *user, size_t size, loff_t *off)
 {
     return 0;
 }
 
+// On Write
 ssize_t kudo_write(struct file *file, const char __user *user, size_t size, loff_t *off)
 {
     char *user_buffer;
     short use_multipage = 0;
+    // Whether to use k or vmalloc
     if (size > PAGE_SIZE) {
         use_multipage = 1;
         user_buffer = vmalloc(size);
     }else{
         user_buffer = kmalloc(size, GFP_KERNEL);
     }
 
+    // Memory allocation fails
     if (user_buffer == NULL){
         printk(KERN_ERR "Failed to allocate %lu bytes of memory.", size);
         return size;
@@ -63,6 +70,7 @@ static const struct proc_ops kudo_proc_fops =
     .proc_write = kudo_write,
 };
 
+// On Load
 static int __init kudo_init(void)
 {
     printk(KERN_INFO "Kudo Module Loaded\n");
@@ -75,12 +83,14 @@ static int __init kudo_init(void)
     return 0;
 }
 
+// On Unload
 static void __exit kudo_exit(void)
 {
     printk(KERN_INFO "Kudo Module Unloaded\n");
     proc_remove(kudo_proc);
 }
 
+// Metadata
 module_init(kudo_init);
 module_exit(kudo_exit);