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/opt/cpanel/ea-ruby27/src/passenger-release-6.1.2/src/agent/README.md

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# Passenger Agent

This directory contains the source code of the Passenger agent. The Passenger agent is a single executable that consists of multiple parts. Within each subdirectory, you will find the source code of that particular part.

## Important parts

The most important parts are:

* The Watchdog is the main Passenger process. It starts the Passenger Core, and restarts them when it crashes. It also cleans everything up upon shut down.
 * The Core performs most of the heavy lifting. It parses requests, spawns application processes, forwards requests to the correct process and forwards application responses back to the web server.

## Minor parts

* SpawnEnvSetupper is a tool used internally by `Core/SpawningKit/` to spawn application processes. See the README in that directory for more information.
 * SystemMetrics is a tool that shows system metrics such as CPU and memory usage. The main functionality is implemented in src/cxx/SystemTools/SystemMetricsCollector.h. This tool is mainly useful for developing and debugging SystemMetricsCollector.h.
 * TempDirToucher is a tool used internally by Passenger Standalone to keep a temporary directory's timestamp up-to-date so that it doesn't get removed by /tmp cleaner daemons.

## Shared code

There is also code that is shared between the different agent parts. That code is located in `Shared`. Unlike `src/cxx_supportlib`, which is meant to be usable outside Passenger, the code in `Shared` is Passenger-specific.

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Name	Size	Perms	Modified	Actions
Core DIR	-	drwxr-xr-x	2026-02-13 08:03:52	Edit Download recursive recursive
ExecHelper DIR	-	drwxr-xr-x	2026-02-13 08:03:52	Edit Download recursive recursive
FileReadHelper DIR	-	drwxr-xr-x	2026-02-13 08:03:52	Edit Download recursive recursive
Shared DIR	-	drwxr-xr-x	2026-02-13 08:03:52	Edit Download recursive recursive
SpawnEnvSetupper DIR	-	drwxr-xr-x	2026-02-13 08:03:52	Edit Download recursive recursive
SystemMetrics DIR	-	drwxr-xr-x	2026-02-13 08:03:52	Edit Download recursive recursive
TempDirToucher DIR	-	drwxr-xr-x	2026-02-13 08:03:52	Edit Download recursive recursive
Watchdog DIR	-	drwxr-xr-x	2026-02-13 08:03:52	Edit Download recursive recursive
AgentMain.cpp	3.29 KB	lrw-r--r--	2026-01-27 23:50:52	Edit Download recursive recursive
MainFunctions.h	1.68 KB	lrw-r--r--	2026-01-27 23:50:52	Edit Download recursive recursive
README.md	1.45 KB	lrw-r--r--	2026-01-27 23:50:52	Edit Download recursive recursive

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