126 lines
3.3 KiB
C
126 lines
3.3 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/sched.h>
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#include <linux/kallsyms.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/miscdevice.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 long
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hello_control_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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//int ret = -ENOTTY;
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//switch (cmd) {
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//}
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printk(KERN_INFO "[%s] received command: %d\n", __this_module.name, cmd);
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return 0;
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}
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static const struct file_operations hello_ctl_fops = {
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.unlocked_ioctl = hello_control_ioctl,
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.compat_ioctl = hello_control_ioctl,
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.owner = THIS_MODULE,
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.llseek = noop_llseek,
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};
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static struct miscdevice hello_misc = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "helloctl",
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.fops = &hello_ctl_fops,
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};
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MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR);
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MODULE_ALIAS("devname:helloctl");
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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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// module parameters
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static char *sym_name = "files";
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module_param(sym_name, charp, S_IRUGO);
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static void hello_fib_stuff(long f_cap, long f_start1, long f_start2) {
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long f_int;
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unsigned long jiffies_start, jiffies_diff;
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jiffies_start = jiffies;
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f_int = hello_fib(f_cap, f_start1, f_start2);
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jiffies_diff = jiffies - jiffies_start;
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printk("[%s] fib of %ld and %ld (up to %ld): %ld (in only %lu jiffies)\n",
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__this_module.name, f_start1, f_start2, f_cap, f_int, jiffies_diff);
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}
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#define FILENAME_LENGTH 255
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static int __init hello_init(void)
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{
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char filename[FILENAME_LENGTH];
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unsigned long sym_addr;
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// in linux/sched.h
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//struct task_struct *current;
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printk(KERN_INFO "[%s] pid: %d, comm: %s\n", __this_module.name, current->pid, current->comm);
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hello_print_hello();
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printk(KERN_INFO "[%s] looking up '%s'\n", __this_module.name, sym_name);
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sym_addr = kallsyms_lookup_name(sym_name);
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printk(KERN_INFO "[%s] %s 0x%lx\n", __this_module.name, sym_name, sym_addr);
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if ((char *)sym_addr != NULL) {
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strncpy(filename, (char *)sym_addr, FILENAME_LENGTH);
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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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}
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hello_fib_stuff(10000000, 0, 1);
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return misc_register(&hello_misc);
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}
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static void __exit hello_cleanup(void)
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{
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if (misc_deregister(&hello_misc) < 0) {
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printk(KERN_INFO "[%s] misc_deregister failed for control device.\n", __this_module.name);
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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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