finit_module - Linux

Overview

finit_module is a command-line utility that allows for the initialization and finalization of Linux kernel modules. It provides a standardized method to prepare and release the resources used by modules, ensuring their correct operation within the system.

Syntax

finit_module [options] <module_name> <action>

where:

  • <module_name>: Name of the kernel module to be initialized/finalized.
  • <action>: Specifies the action to perform on the module, either init (initialize) or fini (finalize).

Options/Flags

  • -v, –verbose: Enable verbose output, providing detailed information during the operation.
  • -q, –quiet: Suppress all output except for errors.
  • -f, –force: Force the action to be performed, even if the module is already in the desired state.
  • -l, –list: List all available modules and their current state.

Examples

Initialize a module:

finit_module -v my_module init

Finalize a module:

finit_module -f other_module fini

List all modules and their state:

finit_module -l

Common Issues

  • Module not found: Ensure that the module specified in <module_name> is loaded into the kernel.
  • Operation failed: Check system logs for errors related to module initialization/finalization.
  • Module already in desired state: Use the -f option to force the operation even if the module is already initialized or finalized.

Integration

finit_module can be integrated into scripts or automated processes to ensure proper module management. For example:

#!/bin/bash
finit_module -q my_module init
if [ $? -eq 0 ]; then
  # Module initialized successfully, proceed with script execution.
else
  # Error occurred during initialization, handle appropriately.
fi

Related Commands

  • modprobe: Load or unload kernel modules.
  • lsmod: List loaded kernel modules.
  • depmod: Generate module dependencies for the kernel.