How Can I List Running Processes and Their Open Files on Linux?

How to List Running Processes and Their Open Files on Linux

To obtain a list of running processes on a Linux system and the files each one has open, the user can leverage the procps-ng suite. This collection contains the source code for commonly used process management tools such as ps.

procps-ng employs the proc filesystem, offering a standardized interface for accessing various aspects of the system, including running processes. The readproc.c file within the procps-ng source code provides a portable library for retrieving information about processes in a system-independent manner.

Alternatively, the libproc library offers an API for this purpose. Available as a package in common Linux distributions, libproc provides access to process attributes through functions such as proc_openfiles(), which returns a list of open file descriptors for a specified process.

By utilizing either the procps-ng source or the libproc API, developers can effectively list running processes and their associated open files on Linux systems without directly accessing the proc filesystem.

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