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69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/*
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* hello-5.c - Demonstrates command line argument passing to a module.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h> /* for ARRAY_SIZE() */
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/printk.h>
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#include <linux/stat.h>
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MODULE_LICENSE("GPL");
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static short int myshort = 1;
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static int myint = 420;
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static long int mylong = 9999;
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static char *mystring = "blah";
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static int myintarray[2] = { 420, 420 };
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static int arr_argc = 0;
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/* module_param(foo, int, 0000)
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* The first param is the parameter's name.
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* The second param is its data type.
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* The final argument is the permissions bits,
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* for exposing parameters in sysfs (if non-zero) at a later stage.
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*/
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module_param(myshort, short, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
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MODULE_PARM_DESC(myshort, "A short integer");
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module_param(myint, int, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
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MODULE_PARM_DESC(myint, "An integer");
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module_param(mylong, long, S_IRUSR);
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MODULE_PARM_DESC(mylong, "A long integer");
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module_param(mystring, charp, 0000);
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MODULE_PARM_DESC(mystring, "A character string");
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/* module_param_array(name, type, num, perm);
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* The first param is the parameter's (in this case the array's) name.
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* The second param is the data type of the elements of the array.
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* The third argument is a pointer to the variable that will store the number
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* of elements of the array initialized by the user at module loading time.
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* The fourth argument is the permission bits.
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*/
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module_param_array(myintarray, int, &arr_argc, 0000);
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MODULE_PARM_DESC(myintarray, "An array of integers");
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static int __init hello_5_init(void)
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{
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int i;
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pr_info("Hello, world 5\n=============\n");
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pr_info("myshort is a short integer: %hd\n", myshort);
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pr_info("myint is an integer: %d\n", myint);
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pr_info("mylong is a long integer: %ld\n", mylong);
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pr_info("mystring is a string: %s\n", mystring);
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for (i = 0; i < ARRAY_SIZE(myintarray); i++)
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pr_info("myintarray[%d] = %d\n", i, myintarray[i]);
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pr_info("got %d arguments for myintarray.\n", arr_argc);
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return 0;
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}
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static void __exit hello_5_exit(void)
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{
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pr_info("Goodbye, world 5\n");
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}
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module_init(hello_5_init);
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module_exit(hello_5_exit);
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