#ifndef __KERNEL__
#define __KERNEL__
#endif
#ifndef MODULE
#define MODULE
#endif

#include <linux/module.h>
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <asm/uaccess.h>
#include <linux/vt_kern.h>
#include <linux/kmod.h>
#include <linux/sysctl.h>

static int proc_info[4] = {0,0,0,0};

static ctl_table ctl_kd_mksound[2] = {
        {0x19091977, "kd_mksound", &proc_info, 4*sizeof(int),
         0444, NULL, &proc_dointvec},
        {0}
};

static struct ctl_table_header* p;

/* FIXME! */
//static void (*kd_mksound)(unsigned int hz, unsigned int ticks) = NULL;
static void (*original_kd_mksound)(unsigned int hz, unsigned int ticks);

static void my_kd_mksound(unsigned int hz, unsigned int ticks)
{
	++proc_info[0];
	proc_info[1]=current->pid;
	proc_info[2]=hz;
	proc_info[3]=ticks;
	original_kd_mksound(hz,ticks);
}

static int can_unload()
{
	return (kd_mksound != my_kd_mksound);
}

static int init_kd_mksound_cmd(void)
{
	if (!mod_member_present(&__this_module, can_unload)) {
		return -EBUSY;
	}
	__this_module.can_unload = can_unload;

        p=register_sysctl_table(ctl_kd_mksound, 1);
	if (!p) return -EBUSY;

	original_kd_mksound=kd_mksound;
	kd_mksound=my_kd_mksound;
	return 0;
}

static void exit_kd_mksound_cmd(void)
{
        unregister_sysctl_table(p);
	kd_mksound=original_kd_mksound;
//	kd_mksound=kd_mksound;
}

module_init(init_kd_mksound_cmd);
module_exit(exit_kd_mksound_cmd);

/*
 * Local variables:
 * c-file-style: "linux"
 * End:
 */