#lists client information

import fcntl
import json
import os


def read_data():
    try:
        with open('/tmp/ssh_sessions.json', 'r') as f:
            # Get shared lock for reading
            fcntl.flock(f.fileno(), fcntl.LOCK_SH)
            try:
                return json.load(f)
            finally:
                fcntl.flock(f.fileno(), fcntl.LOCK_UN)
    except (FileNotFoundError, ValueError):
        return {}

print(read_data())