printk(KERN_INFO "Hello, world 4\n");
return 0;
}
static void __exit cleanup_hello_4(void)
{
printk(KERN_INFO "Goodbye, world 4\n");
}
module_init(init_hello_4);
module_exit(cleanup_hello_4);
/*
* You can use strings, like this:
*/
/*
* Get rid of taint message by declaring code as GPL.
*/
MODULE_LICENSE("GPL");
/*
* Or with defines, like this:
*/
MODULE_AUTHOR(DRIVER_AUTHOR); /* Who wrote this module? */
MODULE_DESCRIPTION(DRIVER_DESC); /* What does this module do */
/*
* This module uses /dev/testdevice. The MODULE_SUPPORTED_DEVICE macro might
* be used in the future to help automatic configuration of modules, but is
* currently unused other than for documentation purposes.
*/
MODULE_SUPPORTED_DEVICE("testdevice");
2.6. Passing Command Line Arguments to a Module
Modules can take command line arguments, but not with the argc/argv you might be used to.
To allow arguments to be passed to your module, declare the variables that will take the values of the
command line arguments as global and then use the module_param() macro, (defined in
linux/moduleparam.h) to set the mechanism up. At runtime, insmod will fill the variables with any
command line arguments that are given, like ./insmod mymodule.ko myvariable=5. The variable
declarations and macros should be placed at the beginning of the module for clarity. The example code should
clear up my admittedly lousy explanation.
The module_param() macro takes 3 arguments: the name of the variable, its type and permissions for the
corresponding file in sysfs. Integer types can be signed as usual or unsigned. If you'd like to use arrays of
integers or strings see module_param_array() and module_param_string().
int myint = 3;
module_param(myint, int, 0);
Arrays are supported too, but things are a bit different now than they were in the 2.4. days. To keep track of
the number of parameters you need to pass a pointer to a count variable as third parameter. At your option,
you could also ignore the count and pass NULL instead. We show both possibilities here:
The Linux Kernel Module Programming Guide
Chapter 2. Hello World 11
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