$ show jovanlanik/gtklock
gtklock is a GTK-based lockscreen for Wayland compositors. It locks the screen using the ext-session-lock protocol and authenticates users via PAM. The application creates a window for each monitor displaying a clock, date, and password entry. It supports features like idle hiding, multi-monitor focus following, and running custom commands on lock/unlock events. The architecture is modular, with a core GTK application loop, pluggable modules for extensibility, and isolated subsystems for authentication and configuration. The main entry point is in src/source.c, which initializes the GTK application, loads configuration and modules, and sets up event handlers for screen locking and unlocking.
The LLM identified 2 files worth highlighting for reuse:
Provides a non-blocking PAM authentication interface by running the PAM conversation in a child process and communicating via pipes. This allows the main UI thread to remain responsive while checking credentials. It handles PAM's conversation mechanism (for messages, errors, etc.) and returns appropriate status codes (success, failure, wait, etc.). This component can be extracted and used in any application requiring PAM authentication without blocking the main loop.
Implements a plugin system for loading shared objects at runtime. It includes version checking (major and minor) to ensure compatibility between the host and plugins. It defines a set of callback functions that plugins can implement to integrate with the application (e.g., on activation, on lock, on window events). This system is decoupled from the application logic and could be reused in other C applications with minimal changes.