What is the difference between context of "sighup", "super-backend", and "backend" in pg_settings?

From: 周书林 <zhoushulin1992(at)gmail(dot)com>
To: pgsql-general(at)lists(dot)postgresql(dot)org
Subject: What is the difference between context of "sighup", "super-backend", and "backend" in pg_settings?
Date: 2021-06-26 04:56:21
Message-ID: CAE0pyrsddqU=v3EH1nnU-Fy3kfhpZKE3d1ua51N2UZeZKiv3LA@mail.gmail.com
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Hi,

I am interested in the configuration parameter of Postgres. I found that
the configuration parameters in context of "sighup", "super-backend", and
"backend" are all required to send "SIGHUP" signal to postmaster for
rereading configuration files. So my question is, what is the difference
between them, except for the super-usre privilege requirment between
"super-backend", and "backend"?

Sincerely,
Shulin

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