X-Git-Url: http://git.cascardo.eti.br/?p=cascardo%2Fkernel%2Fsamples%2F01.hello%2F.git;a=blobdiff_plain;f=hello.c;h=b5c0a6d6cd88104bf427aa3fd1b2ca7cd4d90d39;hp=25c722d3ad97fa1f22e85b4284492e72c2ca74de;hb=HEAD;hpb=f3a30ce8f7efac8eb603d30d03cdce85eb26d970

diff --git a/hello.c b/hello.c
index 25c722d..b5c0a6d 100644
--- a/hello.c
+++ b/hello.c
@@ -1,22 +1,39 @@
 /* Must be included by every module. */
 #include <linux/module.h>
 
+/* Author name comes here. */
+MODULE_AUTHOR("Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>");
+/* Tell a user what this modules does. */
+MODULE_DESCRIPTION("Prints a friendly message.");
+/* Which version is this? */
+MODULE_VERSION("1.4.0");
 /* Should be declared to not taint the kernel. */
 MODULE_LICENSE("GPL");
 
+#ifndef SUBJECT
+#define SUBJECT "world"
+#endif
+
+static char *subject = SUBJECT;
+
+/* Define subject as a char pointer parameter. */
+module_param(subject, charp, 0664);
+/* Parameter description. */
+MODULE_PARM_DESC(subject, "Subject to say hello to.");
+
 /* Our init function: returns 0 if successfull, an error code, otherwise. */
-static int hello_init(void)
+static int __init hello_init(void)
 {
 	/* printk is just like printf, but without floating point support. */
-	printk(KERN_ALERT "Hello, world!\n");
+	printk(KERN_ALERT "Hello, %s!\n", subject);
 	return 0;
 }
 
 /* Our exit function: static is good, so we do not pollute namespace. */
-static void hello_exit(void)
+static void __exit hello_exit(void)
 {
 	/* KERN_ALERT is a string macro prepended to our message. */
-	printk(KERN_ALERT "Goodbye, cruel world!\n");
+	printk(KERN_ALERT "Goodbye, cruel %s!\n", subject);
 }
 
 /* Here, we declare our module init and exit functions. */