user.c

#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include "mem_ioctl.h"

#define PAGE_SIZE 4096

int main() {
    // 1. 커널 모듈이 생성한 proc 파일 열기
    int fd = open("/proc/malloc_monitor", O_RDWR);

    /* User space memory allocation */
    char *ptr = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE, 
        MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); // Allocate new memory space
    
    printf("user CMD_MALLOC\n");
    ioctl(fd, CMD_MALLOC, ptr); // Send signal to kernel module
    
    printf("user CMD_ACCESS\n");
    /* User space memory access */
    ptr[0] = 'A'; // Memory write
    ioctl(fd, CMD_ACCESS, ptr); // Send signal to kernel module

    printf("user CMD_KMALLOC\n");

    /* Kerel space memory allocation */
    ioctl(fd, CMD_KMALLOC); // Send signal to kernel module

    close(fd);
    return 0;
}