77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
#include <linux/module.h> /* all kernel modules need this */
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#include <linux/init.h> /* provides initialization routines */
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#include <linux/kallsyms.h>
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#include <linux/string.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Vincent Batts <vbatts@hashbangbash.com>");
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MODULE_DESCRIPTION("just getting familiar");
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MODULE_VERSION("1.0");
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//static char __initdata hello_hellomsg[] = KERN_NOTICE "Hello, Kernel, I'm in\n";
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//static char __exitdata hello_byemsg[] = KERN_NOTICE "Bye, I'm out\n";
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static int hello_print_hello(void)
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{
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printk(KERN_INFO "[%s] module loaded.\n", __this_module.name);
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return 0;
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}
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long hello_fib(long times, long n1, long n2)
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{
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long i = 0;
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long prev = n1;
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long curr = n2;
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long next = 0;
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while (i < times)
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{
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next = (prev + curr);
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prev = curr;
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curr = next;
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i++;
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}
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return next;
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}
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static int __init hello_init(void)
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{
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long f_int, f_cap, f_start1, f_start2;
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unsigned long sym_addr;
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char *sym_name;
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char filename[255];
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hello_print_hello();
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sym_name = "files";
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printk("looking up '%s'\n", sym_name);
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sym_addr = kallsyms_lookup_name(sym_name);
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printk("%s 0x%lx\n", sym_name, sym_addr);
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strncpy(filename, (char *)sym_addr, 255);
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printk(KERN_INFO "[%s] %s (0x%lx): %s\n", __this_module.name, sym_name, sym_addr, filename);
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printk("[%s] jiffies: %lu\n", __this_module.name, jiffies);
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f_cap = 10000000;
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f_start1 = 0;
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f_start2 = 1;
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f_int = hello_fib(f_cap, f_start1, f_start2);
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printk("fib of %ld and %ld (up to %ld): %ld\n", f_start1, f_start2, f_cap, f_int);
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printk("[%s] jiffies: %lu\n", __this_module.name, jiffies);
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return 0;
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}
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static void __exit hello_cleanup(void)
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{
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printk(KERN_INFO "[%s] module unloaded.\n", __this_module.name);
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}
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module_init(hello_init);
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module_exit(hello_cleanup);
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// vim:set shiftwidth=4 softtabstop=4 expandtab:
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