UserApp

#include "character_dev.h"
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>

#define VM_READ 0x00000001
#define VM_WRITE 0x00000002
#define VM_EXEC 0x00000004

int main(int argc, char **argv)
{
    int fd;

    if (argc < 2 || (strcmp(argv[1], "help") == 0))
    {
        printf("Usage %s <PID> <PAGE-NUMBER>\n", argv[0]);
        printf("<PID> must be integer more than zero\n");

        return 0;
    }
    int pid = atoi(argv[1]);
    if (pid)
    {
        printf("Entered <PID> is %d\n", pid);
    }
    else
    {
        printf("Wrong <PID>\n");
        return 1;
    }

    fd = open(DEVICE_NAME, 0);

    if (fd < 0)
    {
        printf("Can't open device file: %s\n", DEVICE_NAME);
        exit(2);
    };

    struct pci_dev_info *pdi = malloc(sizeof(struct pci_dev_info));
    struct vm_area_struct_info *vasi = malloc(sizeof(struct vm_area_struct_info));

    vasi->pid = pid;

    int ret_val = ioctl(fd, IOCTL_GET_PCI_DEV, pdi);
    if (ret_val != 0)
    {
        printf("IOCTL_GET_PCI_DEV failed %d", ret_val);
        exit(ret_val);
    }
    printf("<-- PCI DEV -->\n");
    for (int i = 0; i < pdi->actual_count; i++)
    {
        printf("pci found [%d]\n", pdi->devices[i]);
    }
    ret_val = ioctl(fd, IOCTL_GET_VM_AREA_STRUCT, vasi);
    printf("<-- VM AREA STRUCT -->\n");
    if (ret_val != 0)
    {
        printf("IOCTL_GET_VM_AREA_STRUCT failed %d", ret_val);
        if (ret_val == 1)
        {
            printf("Process with <PID> = %d doesn't exist\n", vasi->pid);
        }
        if (ret_val == 2)
        {
            printf("Can't find vm_area_struct for Process with <PID> = %d\n",vasi->pid);
        }

        exit(ret_val);
    }

    for (int i = 0; i < vasi->actual_count; i++)
    {
        printf("0x%0.8hx-0x%0.8hx\t", vasi->vapi[i].vm_start, vasi->vapi[i].vm_end);
        printf("%c%c%c",
               (vasi->vapi[i].permissions & VM_READ) ? 'r' : '-',
               (vasi->vapi[i].permissions & VM_WRITE) ? 'w' : '-',
               (vasi->vapi[i].permissions & VM_EXEC) ? 'x' : '-');
        printf("\t%1d", vasi->vapi[i].rb_subtree_gap);
        printf("\n");
    }
    return 0;
}