lib/test_module.c

   1 /*
   2  * This module emits "Hello, world" on printk when loaded.
   3  *
   4  * It is designed to be used for basic evaluation of the module loading
   5  * subsystem (for example when validating module signing/verification). It
   6  * lacks any extra dependencies, and will not normally be loaded by the
   7  * system unless explicitly requested by name.
   8  */
   9
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/printk.h>
  15
  16 static int __init test_module_init(void)
  17 {
  18         pr_warn("Hello, world\n");
  19
  20         return 0;
  21 }
  22
  23 module_init(test_module_init);
  24
  25 static void __exit test_module_exit(void)
  26 {
  27         pr_warn("Goodbye\n");
  28 }
  29
  30 module_exit(test_module_exit);
  31
  32 MODULE_AUTHOR("Kees Cook <keescook@chromium.org>");
  33 MODULE_LICENSE("GPL");