#!/usr/bin/env python3

import os
import select

path = '/proc/pressure/memory'
some_or_full = 'some'
stall_amount_in_us = '500'
time_window_in_us = '1000000'

s = '{} {} {}\n'.format(some_or_full, stall_amount_in_us, time_window_in_us)

try:
    fd = os.open(path, os.O_RDWR | os.O_NONBLOCK, mode=0o777)
    os.write(fd, s.encode())
    epoll = select.epoll()
    epoll.register(fd, select.POLLPRI)
    print('waiting for events...')
    while True:
        events = epoll.poll(1)
        if len(events) != 0:
            print('event triggered!')
except Exception as e:
    print(e)
finally:
    try:
        os.close(fd)
    except NameError:
        pass