# pid_manager URL: /api/server/pid_manager/ Section: server -------------------------------------------------------------------------------- pid_manager - Bengal window.BENGAL_THEME_DEFAULTS = { appearance: 'dark', palette: 'snow-lynx' }; // Progressive Enhancement System Configuration window.Bengal = window.Bengal || {}; window.Bengal.enhanceBaseUrl = '/bengal/assets/js/enhancements'; window.Bengal.watchDom = true; window.Bengal.debug = false; (function () { try { var defaults = window.BENGAL_THEME_DEFAULTS || { appearance: 'system', palette: '' }; var defaultAppearance = defaults.appearance; if (defaultAppearance === 'system') { defaultAppearance = (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) ? 'dark' : 'light'; } var storedTheme = localStorage.getItem('bengal-theme'); var storedPalette = localStorage.getItem('bengal-palette'); var theme = storedTheme ? (storedTheme === 'system' ? defaultAppearance : storedTheme) : defaultAppearance; var palette = storedPalette ?? defaults.palette; document.documentElement.setAttribute('data-theme', theme); if (palette) { document.documentElement.setAttribute('data-palette', palette); } } catch (e) { document.documentElement.setAttribute('data-theme', 'light'); } })(); Skip to main content Magnifying Glass ESC Recent Clear Magnifying Glass No results for "" Try different keywords or check your spelling Start typing to search... ↑↓ Navigate ↵ Open ESC Close Powered by Lunr ᓚᘏᗢ Documentation Info About Arrow Clockwise Get Started Note Tutorials File Text Content Palette Theming Settings Building Starburst Extending Bookmark Reference Learning Tracks Releases Dev GitHub API Reference bengal CLI Magnifying Glass Search ⌘K Palette Appearance Chevron Down Mode Monitor System Sun Light Moon Dark Palette Snow Lynx Brown Bengal Silver Bengal Charcoal Bengal Blue Bengal List ᓚᘏᗢ Magnifying Glass Search X Close Documentation Info About Arrow Clockwise Get Started Note Tutorials File Text Content Palette Theming Settings Building Starburst Extending Bookmark Reference Learning Tracks Releases Dev GitHub API Reference bengal CLI Palette Appearance Chevron Down Mode Monitor System Sun Light Moon Dark Palette Snow Lynx Brown Bengal Silver Bengal Charcoal Bengal Blue Bengal API Reference __main__ bengal Caret Right Folder Analysis community_detection graph_analysis graph_reporting graph_visualizer knowledge_graph link_suggestions link_types page_rank path_analysis performance_advisor results Caret Right Folder Assets manifest pipeline Caret Right Folder Autodoc base config docstring_parser utils virtual_orchestrator Caret Right Folder Extractors cli openapi python Caret Right Folder Models cli common openapi python Caret Right Folder Cache asset_dependency_map cache_store cacheable compression dependency_tracker page_discovery_cache query_index query_index_registry taxonomy_index utils Caret Right 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Tracks running server processes and provides recovery from stale processes. Features: Automatic stale process detection Graceful process termination (SIGTERM then SIGKILL) PID file validation (ensures it's actually a Bengal process) Cross-platform support (psutil optional, falls back to os.kill) Usage: # Check for stale processes pid_file = PIDManager.get_pid_file(project_root) stale_pid = PIDManager.check_stale_pid(pid_file) if stale_pid: PIDManager.kill_stale_process(stale_pid) # Write current PID PIDManager.write_pid_file(pid_file) # Check port usage port_pid = PIDManager.get_process_on_port(5173) if port_pid: print(f"Port in use by PID {port_pid}") The PID file (.bengal/server.pid) is created in the .bengal directory and automatically cleaned up on normal server shutdown. If the server crashes or is killed, the PID file remains and is detected on next startup. View source 1 Class Classes PIDManager Manage PID files for process tracking and recovery. Features: - Detect stale processes - Graceful … 6 Caret Right Manage PID files for process tracking and recovery. Features: Detect stale processes Graceful process termination PID file validation Cross-platform support Methods 6 get_pid_file staticmethod Get the PID file path for a project. 1 Path Caret Right def get_pid_file(project_root: Path) -> Path Get the PID file path for a project. Parameters 1 project_root Path Root directory of Bengal project Returns Path — Path to PID file in .bengal/ directory is_bengal_process staticmethod Check if PID is actually a Bengal serve process. Uses psutil if available for … 1 bool Caret Right def is_bengal_process(pid: int) -> bool Check if PID is actually a Bengal serve process. Uses psutil if available for accurate process name checking. Falls back to simple existence check if psutil is not installed. Parameters 1 pid int Process ID to check Returns bool — True if process is Bengal serve, False otherwise check_stale_pid staticmethod Check for stale PID file and return PID if found. A stale PID file indicates a… 1 int | None Caret Right def check_stale_pid(pid_file: Path) -> int | None Check for stale PID file and return PID if found. A stale PID file indicates a previous server instance that didn't shut down cleanly (crash, kill -9, power loss, etc.). This method: Reads the PID file Checks if the process exists Verifies it's actually a Bengal process Returns the PID if stale, None otherwise Invalid or empty PID files are automatically cleaned up. Parameters 1 pid_file Path Path to PID file Returns int | None — PID of stale process, or None if no stale process kill_stale_process staticmethod Gracefully kill a stale process. Tries SIGTERM first (graceful), then SIGKILL … 2 bool Caret Right def kill_stale_process(pid: int, timeout: float = 5.0) -> bool Gracefully kill a stale process. Tries SIGTERM first (graceful), then SIGKILL if needed. Parameters 2 pid int Process ID to kill timeout float Seconds to wait for graceful shutdown Returns bool — True if process was killed, False otherwise write_pid_file staticmethod Write current process PID to file. Uses atomic write to ensure the PID file is… 1 None Caret Right def write_pid_file(pid_file: Path) -> None Write current process PID to file. Uses atomic write to ensure the PID file is crash-safe. Parameters 1 pid_file Path Path to PID file get_process_on_port staticmethod Get the PID of process listening on a port. Uses lsof to find which process is… 1 int | None Caret Right def get_process_on_port(port: int) -> int | None Get the PID of process listening on a port. Uses lsof to find which process is listening on a port. This is useful for detecting port conflicts. Parameters 1 port int Port number to check Returns int | None — PID if found, None otherwise ← Previous live_reload Next → reload_controller List © 2025 Bengal ᓚᘏᗢ window.BENGAL_LAZY_ASSETS = { tabulator: '/bengal/assets/js/tabulator.min.js', dataTable: '/bengal/assets/js/data-table.js', mermaidToolbar: '/bengal/assets/js/mermaid-toolbar.9de5abba.js', mermaidTheme: '/bengal/assets/js/mermaid-theme.344822c5.js', graphMinimap: '/bengal/assets/js/graph-minimap.cc7e42e3.js', graphContextual: '/bengal/assets/js/graph-contextual.440e59c6.js' }; window.BENGAL_ICONS = { close: '/bengal/assets/icons/close.911d4fe1.svg', enlarge: '/bengal/assets/icons/enlarge.652035e5.svg', copy: '/bengal/assets/icons/copy.3d56e945.svg', 'download-svg': '/bengal/assets/icons/download.04f07e1b.svg', 'download-png': '/bengal/assets/icons/image.c34dfd40.svg', 'zoom-in': '/bengal/assets/icons/zoom-in.237b4a83.svg', 'zoom-out': '/bengal/assets/icons/zoom-out.38857c77.svg', reset: '/bengal/assets/icons/reset.d26dba29.svg' }; Arrow Up X -------------------------------------------------------------------------------- Metadata: - Author: lbliii - Word Count: 1511 - Reading Time: 8 minutes