- 1 year ago
Handling SIGINT and SIGBREAK signals in Python on WIndows
In Python, you can handle the SIGINT (Ctrl+C) and SIGBREAK (Ctrl+Break) signals on Windows using the signal
module. However, it's important to note that signal handling in Python on Windows has some limitations compared to Unix-based systems.
Here's an example of how you can handle these signals in Python on Windows:
pythonimport signal
import sys
# Define signal handlers
def sigint_handler(signal, frame):
print("SIGINT received")
# Perform any cleanup or exit actions here
sys.exit(0)
def sigbreak_handler(signal, frame):
print("SIGBREAK received")
# Perform any cleanup or exit actions here
sys.exit(0)
# Set the signal handlers
signal.signal(signal.SIGINT, sigint_handler)
signal.signal(signal.SIGBREAK, sigbreak_handler)
# Your main program logic here
while True:
pass # Or perform some other tasks
In the above code, we define two signal handler functions: sigint_handler()
for SIGINT and sigbreak_handler()
for SIGBREAK. These functions will be called when the corresponding signals are received.
The sys.exit(0)
call inside the signal handlers is used to gracefully exit the program. You can perform any necessary cleanup or additional actions before calling sys.exit()
.
Note that on Windows, the SIGINT signal (Ctrl+C) is not immediately delivered to the Python process. Instead, it sets a flag that can be checked using the signal
module or by using the keyboard
module, which provides more reliable cross-platform support for keyboard events.
To use the keyboard
module, you can install it via pip (pip install keyboard
) and modify the code as follows:
pythonimport keyboard
# Define signal handlers
def sigint_handler():
print("SIGINT received")
# Perform any cleanup or exit actions here
sys.exit(0)
def sigbreak_handler():
print("SIGBREAK received")
# Perform any cleanup or exit actions here
sys.exit(0)
# Register the signal handlers
keyboard.add_hotkey('Ctrl+C', sigint_handler)
keyboard.add_hotkey('Ctrl+Break', sigbreak_handler)
# Your main program logic here
while True:
pass # Or perform some other tasks
With the keyboard
module, you can use the add_hotkey()
function to register the hotkeys for Ctrl+C and Ctrl+Break and associate them with the respective signal handlers.
Remember to install the keyboard
module using pip
before running this code.