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Add note about pihole-FTL sigrtmin #1270

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Add note about pihole-FTL sigrtmin
yubiuser Jul 21, 2025
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yubiuser Jul 22, 2025
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11 changes: 10 additions & 1 deletion docs/ftldns/signals.md
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Expand Up @@ -33,7 +33,16 @@ When FTL receives a `SIGHUP`, it clears the entire DNS cache, and then

While `SIGHUP` updates/flushes almost everything, such a massive operation is often not necessary. Hence, we added several small real-time signals available for fine-grained control of what FTL does. When you see `SIGHUP` as a "big gun", the real-time signals are rather the "scalpel" to serve rather specific needs.

Real-time signals are not guaranteed to have the same number on all operating systems as the value of the constant `SIGRTMIN` may vary. For the signals described below, we recommend using the exact signal number described in the parentheses, e.g., real-time signal 0 (35) can be sent like:
<!-- markdownlint-disable code-block-style -->
!!! warning "Real-time signals vary"
Real-time signals are not guaranteed to have the same number on all operating systems as the value of the constant `SIGRTMIN` may vary.
You can check the value on your system with

```bash
pihole-FTL sigrtmin
```
<!-- markdownlint-enable code-block-style -->
For the signals described below, we recommend using the exact signal number described in the parentheses, e.g., real-time signal 0 (assuming `RTMIN=35`) can be sent like:

```bash
sudo pkill -SIG35 pihole-FTL
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