Python: How to prevent subprocesses from receiving CTRL-C / Control-C / SIGINT

Python: How to prevent subprocesses from receiving CTRL-C / Control-C / SIGINT

To prevent subprocesses from receiving the CTRL-C (Control-C) signal or SIGINT in Python, you can use the preexec_fn argument of the subprocess.Popen constructor to set a custom signal handler for the subprocesses. You can specify a function that ignores the SIGINT signal for the subprocesses. Here's an example:

import subprocess import os import signal def ignore_sigint(): # Set a custom signal handler to ignore SIGINT signal.signal(signal.SIGINT, signal.SIG_IGN) # Define the command you want to run as a subprocess command = ["your_command_here"] # Create a subprocess and set the custom signal handler process = subprocess.Popen(command, preexec_fn=ignore_sigint) # Wait for the subprocess to finish process.wait()

In this code:

  1. We define a function ignore_sigint() that sets a custom signal handler for SIGINT to ignore it using signal.SIG_IGN.

  2. We specify the command you want to run in the command list. Replace "your_command_here" with the actual command you want to run.

  3. We create a subprocess using subprocess.Popen() and pass the preexec_fn=ignore_sigint argument to set the custom signal handler for the subprocess.

  4. The subprocess is executed, and SIGINT signals are ignored by the subprocess.

  5. Finally, we wait for the subprocess to finish using process.wait().

By setting a custom signal handler for the subprocess, you can control how it responds to signals like CTRL-C (SIGINT) independently of the main Python process. This can be useful when you want to handle signals differently in subprocesses or prevent them from being terminated by CTRL-C.

Examples

  1. How to prevent subprocesses from receiving CTRL-C in Python?

    Description: When running Python subprocesses, you may want to prevent them from receiving the CTRL-C signal (SIGINT). This code snippet demonstrates how to achieve that using the preexec_fn argument of the subprocess.Popen constructor to set the child process group ID.

    import os import signal import subprocess def preexec_function(): os.setpgrp() process = subprocess.Popen(["your_command_here"], preexec_fn=preexec_function)

  2. Python subprocess: Ignore SIGINT for child processes

    Description: Sometimes, you need child processes launched by Python to ignore SIGINT (CTRL-C). This can be achieved by setting the handler for SIGINT to SIG_IGN for the child processes.

    import signal import subprocess signal.signal(signal.SIGINT, signal.SIG_IGN) process = subprocess.Popen(["your_command_here"])

  3. Prevent subprocesses from receiving Control-C in Python

    Description: You can prevent subprocesses from receiving Control-C by setting the creationflags parameter with CREATE_NEW_PROCESS_GROUP flag in the subprocess.Popen call.

    import subprocess process = subprocess.Popen(["your_command_here"], creationflags=subprocess.CREATE_NEW_PROCESS_GROUP)

  4. How to handle SIGINT in Python subprocesses?

    Description: To handle SIGINT in Python subprocesses, you can set a custom signal handler using signal.signal.

    import signal import subprocess def sigint_handler(signum, frame): print("SIGINT received, ignoring...") signal.signal(signal.SIGINT, sigint_handler) process = subprocess.Popen(["your_command_here"])

  5. Python subprocess: Disable CTRL-C propagation

    Description: To prevent CTRL-C propagation to subprocesses, set the creationflags parameter with CREATE_NEW_PROCESS_GROUP flag in the subprocess.Popen constructor.

    import subprocess process = subprocess.Popen(["your_command_here"], creationflags=subprocess.CREATE_NEW_PROCESS_GROUP)

  6. Ignore SIGINT in Python subprocesses

    Description: You can ignore SIGINT in Python subprocesses by setting the signal handler to signal.SIG_IGN.

    import signal import subprocess signal.signal(signal.SIGINT, signal.SIG_IGN) process = subprocess.Popen(["your_command_here"])

  7. Python subprocess: Prevent CTRL-C propagation

    Description: Preventing CTRL-C propagation to subprocesses can be done by setting the creationflags parameter with CREATE_NEW_PROCESS_GROUP flag in the subprocess.Popen call.

    import subprocess process = subprocess.Popen(["your_command_here"], creationflags=subprocess.CREATE_NEW_PROCESS_GROUP)

  8. Handle SIGINT in Python subprocesses

    Description: To handle SIGINT in Python subprocesses, define a custom signal handler using signal.signal.

    import signal import subprocess def sigint_handler(signum, frame): print("SIGINT received, ignoring...") signal.signal(signal.SIGINT, sigint_handler) process = subprocess.Popen(["your_command_here"])

  9. Prevent CTRL-C from reaching subprocesses in Python

    Description: Preventing CTRL-C from reaching subprocesses in Python can be achieved by setting the creationflags parameter with CREATE_NEW_PROCESS_GROUP flag in the subprocess.Popen constructor.

    import subprocess process = subprocess.Popen(["your_command_here"], creationflags=subprocess.CREATE_NEW_PROCESS_GROUP)

  10. Python subprocess: How to ignore SIGINT?

    Description: You can ignore SIGINT in Python subprocesses by setting the signal handler to signal.SIG_IGN.

    import signal import subprocess signal.signal(signal.SIGINT, signal.SIG_IGN) process = subprocess.Popen(["your_command_here"])

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