디바이스 드라이버 컴파일 문제입니다.

디바이스 드라이버를 만드는데 컴파일이 안되네요
read할때 랜덤한 값을 생성하는 건데 stdlib.h파일도 못읽고
에러가 생기네요..

어떻게 해야죠?

#include linux/kernel.h> #include linux/fs.h> #include linux/module.h> #include linux/init.h> #include asm/uaccess.h> #include stdlib.h>

#define Dev_name "divemod"

int divemod_major = 0;
int result;

int dive_init(void);
void clean_mod(void);

int dive_open(struct inode *inode, struct file *filp);
ssize_t dive_read(struct file *filp, void *buf, size_t count, loff_t *f_pos);
int dive_release(struct inode *inode, struct file *filp);

int dive_open(struct inode *inode, struct file *filp)
{
MOD_INC_USE_COUNT;
return 0;
}

int dive_release(struct inode *inode, struct file *filp)
{
MOD_DEC_USE_COUNT;
return 0;
}

ssize_t dive_read(struct file *filp, void *buf, size_t count, loff_t *f_pos)
{
unsigned int buffer[4];

buffer[0] = rand() % 100; // Death
buffer[1] = rand() % 10 + 15; // water temp
buffer[2] = rand() % 3 + 35; // body heat
buffer[3] = rand() % 20 + 60; // heart rate

copy_to_user(buf, buffer, count);

return count;
}

struct file_operations dive_fops = {
.open = dive_open,
.release = dive_release,
.read = dive_read,
};

int dive_init(void)
{
result = register_chrdev(divemod_major, Dev_name, &dive_fops);
if(result < 0)
{
printk(KERN_WARNING "%s: can't get major %d\n",Dev_name, divemod_major);
return result;
}
return 0;
}

void clean_mod(void)
{
if(!unregister_chrdev(result, Dev_name))
printk("%s cleanup_module success...\n", Dev_name);
else
printk("%s cleanup_module fail...\n", Dev_name);
}

module_init(dive_init);
module_exit(clean_mod);

Makefile..

obj-m := divemod.o

KDIR := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)

default:
$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules

error message..

make -C /lib/modules/2.6.8-2-386/build SUBDIRS=/root/project/dd modules
make[1]: Entering directory `/usr/src/kernel-headers-2.6.8-2'
CC [M] /root/project/dd/divemod.o
/root/project/dd/divemod.c:1:20: stdlib.h: 그런 파일이나 디렉토리가 없음
/root/project/dd/divemod.c: In function `dive_open':
/root/project/dd/divemod.c:22: warning: `MOD_INC_USE_COUNT' is deprecated (declared at include/linux/module.h:555)
/root/project/dd/divemod.c: In function `dive_release':
/root/project/dd/divemod.c:28: warning: `MOD_DEC_USE_COUNT' is deprecated (declared at include/linux/module.h:567)
/root/project/dd/divemod.c: In function `dive_read':
/root/project/dd/divemod.c:36: warning: implicit declaration of function `rand'
/root/project/dd/divemod.c: At top level:
/root/project/dd/divemod.c:49: warning: initialization from incompatible pointer type
make[2]: *** [/root/project/dd/divemod.o] 오류 1
make[1]: *** [_module_/root/project/dd] 오류 2
make[1]: Leaving directory `/usr/src/kernel-headers-2.6.8-2'
make: *** [default] 오류 2