DEVICE = "/dev/variable_monitor"
import os, sys
import ctypes
from ctypes import *
import fcntl

file_desc = None


def open_device():
    global file_desc
    if file_desc is None:
        try:
            file_desc = os.open(DEVICE, os.O_RDWR)
        except OSError:
            print(f"Can't open device file: {DEVICE}")
            return -1
    return 0


def close_device():
    global file_desc
    if file_desc is None:
        print(f"Device not open: {DEVICE}, {file_desc}")
        return file_desc

    os.close(file_desc)
    file_desc = None
    return 0


class ioctl_pid(Structure):
    _fields_ = [
        ("pid", c_int),
    ]


def ioctl(pid: int):
    pidc = ioctl_pid(
        pid=c_int(pid),
    )
    ret = fcntl.ioctl(file_desc, 0, pidc)
    if ret == 0:
        print("success")


pid = int(sys.argv[1])

open_device()

ioctl(pid)

close_device()