Fix native CLI TCP regression path

lyngio/src/androidMain/kotlin/net/sergeych/lyngio/net/PlatformAndroid.kt

@@ -28,6 +28,8 @@ import java.net.InetAddress
 
 actual fun getSystemNetEngine(): LyngNetEngine = AndroidKtorNetEngine
 
+actual fun shutdownSystemNetEngine() {}
+
 private object AndroidKtorNetEngine : LyngNetEngine {
     private val selectorManager: SelectorManager by lazy { ActorSelectorManager(Dispatchers.IO) }
 

lyngio/src/commonMain/kotlin/net/sergeych/lyngio/net/LyngNet.kt

@@ -97,3 +97,5 @@ internal object UnsupportedLyngNetEngine : LyngNetEngine {
 }
 
 expect fun getSystemNetEngine(): LyngNetEngine
+
+expect fun shutdownSystemNetEngine()

lyngio/src/darwinMain/kotlin/net/sergeych/lyngio/net/PlatformDarwin.kt

@@ -1,8 +1,14 @@
 package net.sergeych.lyngio.net
 
-actual fun getSystemNetEngine(): LyngNetEngine = createNativeKtorNetEngine(
+private val systemNetEngine: LyngNetEngine = createNativeKtorNetEngine(
     isSupported = true,
     isTcpAvailable = true,
     isTcpServerAvailable = true,
     isUdpAvailable = true,
 )
+
+actual fun getSystemNetEngine(): LyngNetEngine = systemNetEngine
+
+actual fun shutdownSystemNetEngine() {
+    shutdownNativeKtorNetEngine(systemNetEngine)
+}

lyngio/src/jsMain/kotlin/net/sergeych/lyngio/net/PlatformJs.kt

@@ -13,6 +13,8 @@ import org.khronos.webgl.Uint8Array
 
 actual fun getSystemNetEngine(): LyngNetEngine = jsNodeNetEngineOrNull ?: UnsupportedLyngNetEngine
 
+actual fun shutdownSystemNetEngine() {}
+
 private val jsNodeNetEngineOrNull: LyngNetEngine? by lazy {
     if (!isNodeRuntime()) return@lazy null
     val net = requireNodeModule("net") ?: return@lazy null

lyngio/src/jvmMain/kotlin/net/sergeych/lyngio/net/PlatformJvm.kt

@@ -45,6 +45,8 @@ import java.net.InetAddress
 
 actual fun getSystemNetEngine(): LyngNetEngine = JvmKtorNetEngine
 
+actual fun shutdownSystemNetEngine() {}
+
 private object JvmKtorNetEngine : LyngNetEngine {
     private val selectorManager: SelectorManager by lazy { ActorSelectorManager(Dispatchers.IO) }
 

lyngio/src/linuxMain/kotlin/net/sergeych/lyngio/net/PlatformLinux.kt

@@ -1,8 +1,14 @@
 package net.sergeych.lyngio.net
 
-actual fun getSystemNetEngine(): LyngNetEngine = createNativeKtorNetEngine(
+private val systemNetEngine: LyngNetEngine = createNativeKtorNetEngine(
     isSupported = true,
     isTcpAvailable = true,
     isTcpServerAvailable = true,
     isUdpAvailable = true,
 )
+
+actual fun getSystemNetEngine(): LyngNetEngine = systemNetEngine
+
+actual fun shutdownSystemNetEngine() {
+    shutdownNativeKtorNetEngine(systemNetEngine)
+}

lyngio/src/mingwMain/kotlin/net/sergeych/lyngio/net/PlatformMingw.kt

@@ -1,3 +1,5 @@
 package net.sergeych.lyngio.net
 
 actual fun getSystemNetEngine(): LyngNetEngine = UnsupportedLyngNetEngine
+
+actual fun shutdownSystemNetEngine() {}

lyngio/src/nativeMain/kotlin/net/sergeych/lyngio/net/NativeKtorNetEngine.kt

@@ -40,7 +40,10 @@ private class NativeKtorNetEngine(
     override val isTcpServerAvailable: Boolean,
     override val isUdpAvailable: Boolean,
 ) : LyngNetEngine {
-    private val selectorManager: SelectorManager by lazy { SelectorManager(Dispatchers.Default) }
+    private var selectorManager: SelectorManager? = null
+
+    private fun selectorManager(): SelectorManager =
+        selectorManager ?: SelectorManager(Dispatchers.Default).also { selectorManager = it }
 
     override suspend fun resolve(host: String, port: Int): List<LyngSocketAddress> {
         val rawAddress = InetSocketAddress(host, port).resolveAddress()
@@ -62,7 +65,7 @@ private class NativeKtorNetEngine(
         noDelay: Boolean,
     ): LyngTcpSocket {
         val connectBlock: suspend () -> Socket = {
-            aSocket(selectorManager).tcp().connect(host, port) {
+            aSocket(selectorManager()).tcp().connect(host, port) {
                 this.noDelay = noDelay
             }
         }
@@ -77,7 +80,7 @@ private class NativeKtorNetEngine(
         reuseAddress: Boolean,
     ): LyngTcpServer {
         val bindHost = host ?: "0.0.0.0"
-        val server = aSocket(selectorManager).tcp().bind(bindHost, port) {
+        val server = aSocket(selectorManager()).tcp().bind(bindHost, port) {
             backlogSize = backlog
             this.reuseAddress = reuseAddress
         }
@@ -86,11 +89,16 @@ private class NativeKtorNetEngine(
 
     override suspend fun udpBind(host: String?, port: Int, reuseAddress: Boolean): LyngUdpSocket {
         val bindHost = host ?: "0.0.0.0"
-        val socket = aSocket(selectorManager).udp().bind(bindHost, port) {
+        val socket = aSocket(selectorManager()).udp().bind(bindHost, port) {
             this.reuseAddress = reuseAddress
         }
         return NativeLyngUdpSocket(socket)
     }
+
+    fun shutdown() {
+        selectorManager?.close()
+        selectorManager = null
+    }
 }
 
 private class NativeLyngTcpSocket(
@@ -214,3 +222,7 @@ private fun ByteArray.toIpHostString(): String = when (size) {
     }
     else -> error("Unsupported IP address length: $size")
 }
+
+internal fun shutdownNativeKtorNetEngine(engine: LyngNetEngine) {
+    (engine as? NativeKtorNetEngine)?.shutdown()
+}