//go:build darwin || ios

package main

import "tailscale.com/net/netmon"

// updateDefaultRouteInterface pushes the OS-observed default-route
// interface name into netmon's package-level cache
// (tailscale.com/net/netmon/defaultroute_darwin.go), which Apple builds
// consult before falling back to the AF_ROUTE guess. Tailscale's own
// Apple clients feed this from an NWPathMonitor in Swift (upstream PR
// #10680) because passive route monitoring is unreliable inside app
// processes; our embedding does the same via
// TailscaleUpdateDefaultRouteInterface. Package-level state: safe to
// call whether or not the node is running (an empty name is an upstream
// no-op), and the freshest value simply wins the next default-route
// lookup.
func updateDefaultRouteInterface(name string) {
	netmon.UpdateLastKnownDefaultRouteInterface(name)
}