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wifi(linux): skip nl80211 when no wireless devices are registered

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Check /sys/class/ieee80211 before opening netlink sockets. Looking up
the
nl80211 family while cfg80211 is not loaded makes the kernel run
modprobe,
which loads the module on hosts without wireless hardware, or fails
again
on every poll when the module is unavailable.
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henrygd
2026-10-02 12:46:38 -04:00
parent 0cca9d0602
commit b115e2aa6a
3 changed files with 40 additions and 0 deletions
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agent/wifi/README.md
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@@ -6,6 +6,7 @@ snapshot keyed by interface (`s` SSID, `r` RSSI in dBm when available);
interval only; real-time requests reuse the last snapshot.
- Linux: nl80211 via `github.com/mdlayher/wifi`. Docker needs `network_mode: host`.
Skipped when `/sys/class/ieee80211` lists no wireless devices.
- macOS: CoreWLAN via `osascript` (JXA). SSID may be redacted by privacy settings.
- Windows: native WLAN API, keyed by adapter alias (e.g. `Wi-Fi`), falling back
to interface GUID.