based on a book i'm reading, apparently i can write a loadable
module whose entire source file is nothing more than:
=====
#include <linux/module.h>
#include <linux/jiffies.h>
module_param(jiffies, uint, 444) ;
MODULE_LICENSE("Dual BSD/GPL");
=====
as you can see, its entire purpose is to make the internal value
"jiffies" available to me under /sys/module and, sure enough, using
the standard kbuild structure, it builds and loads and seems to work.
but i wasn't aware that you could write a valid loadable module
without at least a call to module_init(). in fact, from
include/linux/init.h:
/* Each module must use one module_init(), or one no_module_init */
clearly, i'm not doing that. so, should i have been surprised that
the above is a valid loadable module? why does it load without a call
to module_init() that returns a success value of zero?
rday
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA
http://crashcourse.ca
========================================================================
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