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Add note about pihole-FTL sigrtmin

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Signed-off-by: yubiuser <github@yubiuser.dev>
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yubiuser
2025-07-21 11:34:11 +02:00
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docs/ftldns/signals.md
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@@ -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. 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 ```bash
sudo pkill -SIG35 pihole-FTL sudo pkill -SIG35 pihole-FTL