signal.py

import signal
import boto3
import os

def lambda_handler(event, context):
    signal.alarm(int(context.get_remaining_time_in_millis() / 1000) - 1)
    signal.signal(signal.SIGALRM, timeout_handler)
    
    # Do other stuff
    while True:
        pass
    
def timeout_handler(_signal, _frame):
    client = boto3.client('sns')
    LAMBDA_NAME = os.environ['AWS_LAMBDA_FUNCTION_NAME']
    response = client.publish(
        TopicArn = 'string',
        Subject = f'{LAMBDA_NAME} getting timeout.',
        Message = f'{LAMBDA_NAME} lambda getting timeout please review it.'
    )