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AF_NDRV sockets allow multiple binds but only the first process receives packets. This caused silent failures when a previous lltdDaemon was still running. Now uses flock() on /tmp/lltdDaemon.lock to ensure only one instance runs at a time.
Implements a pure C API for querying Wi-Fi metrics on macOS using CoreWLAN framework. This provides RSSI, noise, link speed, and computed max link speed without relying on external commands like wdutil or airport. New files: - lltd_wifi_corewlan.h: Pure C89 header with lltd_wifi_metrics_t struct - lltd_wifi_corewlan.m: Objective-C shim using CoreWLAN - lltd_wifi_rates.c/h: Rate calculation tables for HT/VHT/HE PHY modes - tools/lltd-wifi-metrics.c: CLI tool for testing/verification Features: - Queries RSSI, noise, PHY mode, channel width via CoreWLAN - Computes theoretical max link speed based on PHY/width/NSS - Infers NSS/MCS/GI from observed link rate using rate tables - Supports 802.11a/b/g/n/ac/ax with proper rate calculations - Handles missing selectors gracefully for SDK compatibility The module is Darwin-only and guarded with __APPLE__. No Objective-C headers leak into the cross-platform C codebase.
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