signal_handlers.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#############################################################################
#
# OnAirScreen
# Copyright (c) 2012-2026 Sascha Ludwig, astrastudio.de
# All rights reserved.
#
# signal_handlers.py
# This file is part of OnAirScreen
#
# You may use this file under the terms of the BSD license as follows:
#
# "Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#   * Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
#   * Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in
#     the documentation and/or other materials provided with the
#     distribution.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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#############################################################################

"""
Signal Handlers for OnAirScreen

This module handles system signals for graceful application shutdown.
"""

import sys

from PyQt6.QtWidgets import QApplication


def sigint_handler(*args) -> None:
    """
    Handler for SIGINT signal (Ctrl+C)
    
    Gracefully quits the application when interrupted.
    """
    sys.stderr.write("\n")
    QApplication.quit()


def setup_signal_handlers() -> None:
    """
    Setup signal handlers for the application
    
    Registers SIGINT handler for graceful shutdown on Ctrl+C.
    """
    import signal
    signal.signal(signal.SIGINT, sigint_handler)