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From: Grant Edwards <invalid@invalid.invalid>
Newsgroups: comp.arch.embedded
Subject: Re: Linux Embedded: how to get info from a running service
Date: Wed, 9 Aug 2023 13:00:59 -0000 (UTC)
Organization: PANIX Public Access Internet and UNIX, NYC
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On 2023-08-09, David Brown <david.brown@hesbynett.no> wrote:
> On 09/08/2023 09:27, pozz wrote:

>> [1] Ghost because it can't be read by any other process.
>> 
>
> It can, through a duplicate file descriptor.  In practice this is 
> commonly done by child processes - when you fork(), the child gets a 
> copy of all the open file descriptors.

You can also pass filedescriptors to non-related processes via
Unix-domain sockets.

https://copyconstruct.medium.com/file-descriptor-transfer-over-unix-domain-sockets-dcbbf5b3b6ec

https://www.sobyte.net/post/2022-01/pass-fd-over-domain-socket/