> Hi all,
> this is probably a simple question but I am not sure where to look for
> the answer. I have Rubini's Linux Device Drivers book, and I am trying
> to get his example Hello World module going. I am running Red Hat 6.2
> kernel 2.2.14-5.0. Here is the code that I use:
>
> #define MODULE
> #include <linux/module.h>
>
> int init_module(void) { printk("<1>Hello World\n"); return 0;}
> void cleanup_module(void) {printk("<1>Goodbye\n");}
>
> and this is what I type when I am logged in as root:
>
> # gcc -c hello.c
> # insmod hello.o
>
> the message "Hello World" does not get displayed
>
> then I type:
>
> #rmmod hello
>
> the message "Goodbye" does not get displayed.
>
> I can tell (I think) that the module is being inserted because if I try to
> insert it twice without removing it first, it says a module with that name
> already exists.
use the dmesg command to see the output or tail /var/log/messages. Printk
sends output to the console which you can't see if you're running an
xterm (for example).
+==================================================================+
Phil Daly, NOAO/AURA, 950 N. Cherry Avenue, Tucson AZ 85719, U S A
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