Creating a Minimal Daemon in C or Python
To create a minimal daemon, you need to ensure that your process runs in the background, does not stay attached to the controlling terminal, and can keep running indefinitely. The core requirements for such a daemon are:
- Detachment from the terminal by forking and possibly creating a new session;
- An infinite loop to keep the process alive until explicitly stopped;
- Basic logging to a file or standard output for monitoring activity.
These requirements form the foundation of any custom daemon, regardless of the programming language you choose.
minimal_daemon.c
minimal_daemon.py
The infinite loop in both the C and Python examples ensures that the daemon keeps running in the background. Inside this loop, the daemon writes a simple log entry to a file every 10 seconds. This logging helps confirm that the process is active and working as expected. The detachment steps, such as forking, creating a new session, and redirecting standard file descriptors, allow the daemon to run independently of the terminal. By combining these elements, your process will behave like a well-formed minimal daemon, staying alive until it is explicitly stopped or receives a termination signal.
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To create a minimal daemon, you need to ensure that your process runs in the background, does not stay attached to the controlling terminal, and can keep running indefinitely. The core requirements for such a daemon are:
- Detachment from the terminal by forking and possibly creating a new session;
- An infinite loop to keep the process alive until explicitly stopped;
- Basic logging to a file or standard output for monitoring activity.
These requirements form the foundation of any custom daemon, regardless of the programming language you choose.
minimal_daemon.c
minimal_daemon.py
The infinite loop in both the C and Python examples ensures that the daemon keeps running in the background. Inside this loop, the daemon writes a simple log entry to a file every 10 seconds. This logging helps confirm that the process is active and working as expected. The detachment steps, such as forking, creating a new session, and redirecting standard file descriptors, allow the daemon to run independently of the terminal. By combining these elements, your process will behave like a well-formed minimal daemon, staying alive until it is explicitly stopped or receives a termination signal.
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