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Systemd::Util - Some utility routines related to Systemd


This document describes version 0.002 of Systemd::Util (from Perl distribution Systemd-Util), released on 2019-06-17.




 systemd_is_running() -> [status, msg, payload, meta]

Check if systemd is running.

Will return payload of 1 if systemd is running, 0 if not running, undef if cannot determine for sure. The result metadata func.note will give more details. The following heuristics are currently used:

1. Check if /sbin/init exists, if it does not the return 0.
3. Check if /lib/systemd/systemd exists. Return 0 otherwise.
5. Return undef otherwise, since we detect that /lib/systemd/systemd exists (systemd is installed) but we cannot be sure if it is running or not.

When used as a CLI, this routine will exit 0 if systemd is running, 1 if systemd is not running, or 99 if cannot determine for sure. To see the more detailed note, you can run the CLI with --json to return the whole enveloped response.

This function is not exported by default, but exportable.

No arguments.

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)


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