Native: move samples to backend.native/tests/

kotlin-native/backend.native/tests/samples/echoServer/build.gradle.kts

@@ -0,0 +1,52 @@
+import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeTargetPreset
+
+plugins {
+    kotlin("multiplatform")
+}
+
+// Add two additional presets for Raspberry Pi and Linux/ARM64.
+val raspberryPiPresets: List<KotlinNativeTargetPreset> = listOf("linuxArm32Hfp", "linuxArm64").map {
+    kotlin.presets[it] as KotlinNativeTargetPreset
+}
+
+kotlin {
+    // Determine host preset.
+    val hostOs = System.getProperty("os.name")
+
+    // Create a target for the host platform.
+    val hostTarget = when {
+        hostOs == "Mac OS X" -> macosX64("echoServer")
+        hostOs == "Linux" -> linuxX64("echoServer")
+        hostOs.startsWith("Windows") -> mingwX64("echoServer")
+        else -> throw GradleException("Host OS '$hostOs' is not supported in Kotlin/Native $project.")
+    }
+
+    // Create cross-targets.
+    val raspberryPiTargets = raspberryPiPresets.map { preset ->
+        val targetName = "echoServer${preset.name.capitalize()}"
+        targetFromPreset(preset, targetName) {}
+    }
+
+    // Configure executables for all targets.
+    configure(raspberryPiTargets + listOf(hostTarget)) {
+        binaries {
+            executable {
+                entryPoint = "sample.echoserver.main"
+                runTask?.args(3000)
+            }
+        }
+    }
+
+    sourceSets {
+        val echoServerMain by getting
+        raspberryPiPresets.forEach { preset ->
+            val mainSourceSetName = "echoServer${preset.name.capitalize()}Main"
+            getByName(mainSourceSetName).dependsOn(echoServerMain)
+        }
+    }
+
+    // Enable experimental stdlib API used by the sample.
+    sourceSets.all {
+        languageSettings.optIn("kotlin.ExperimentalStdlibApi")
+    }
+}

kotlin-native/backend.native/tests/samples/echoServer/gradle.properties

@@ -0,0 +1,2 @@
+kotlin.code.style=official
+kotlin.import.noCommonSourceSets=true

kotlin-native/backend.native/tests/samples/echoServer/src/echoServerMain/kotlin/EchoServer.kt

@@ -0,0 +1,87 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package sample.echoserver
+
+import kotlinx.cinterop.*
+import platform.posix.*
+
+fun main(args: Array<String>) {
+    if (args.isEmpty()) {
+        println("Usage: echoserver.kexe <port>")
+        return
+    }
+
+    val port = args[0].toShort()
+
+    // Initialize sockets in platform-dependent way.
+    init_sockets()
+
+    memScoped {
+
+        val buffer = ByteArray(1024)
+        val prefixBuffer = "echo: ".encodeToByteArray()
+        val serverAddr = alloc<sockaddr_in>()
+
+        val listenFd = socket(AF_INET, SOCK_STREAM, 0)
+                .ensureUnixCallResult("socket") { !it.isMinusOne() }
+
+        with(serverAddr) {
+            memset(this.ptr, 0, sockaddr_in.size.convert())
+            sin_family = AF_INET.convert()
+            sin_port = posix_htons(port).convert()
+        }
+
+        bind(listenFd, serverAddr.ptr.reinterpret(), sockaddr_in.size.convert())
+                .ensureUnixCallResult("bind") { it == 0 }
+
+        listen(listenFd, 10)
+                .ensureUnixCallResult("listen") { it == 0 }
+
+        val commFd = accept(listenFd, null, null)
+                .ensureUnixCallResult("accept") { !it.isMinusOne() }
+
+        buffer.usePinned { pinned ->
+          while (true) {
+            val length = recv(commFd, pinned.addressOf(0), buffer.size.convert(), 0).toInt()
+                    .ensureUnixCallResult("read") { it >= 0 }
+
+            if (length == 0) {
+                break
+            }
+
+            send(commFd, prefixBuffer.refTo(0), prefixBuffer.size.convert(), 0)
+                    .ensureUnixCallResult("write") { it >= 0 }
+            send(commFd, pinned.addressOf(0), length.convert(), 0)
+                    .ensureUnixCallResult("write") { it >= 0 }
+          }
+        }
+    }
+}
+
+inline fun Int.ensureUnixCallResult(op: String, predicate: (Int) -> Boolean): Int {
+    if (!predicate(this)) {
+        throw Error("$op: ${strerror(posix_errno())!!.toKString()}")
+    }
+    return this
+}
+
+inline fun Long.ensureUnixCallResult(op: String, predicate: (Long) -> Boolean): Long {
+    if (!predicate(this)) {
+        throw Error("$op: ${strerror(posix_errno())!!.toKString()}")
+    }
+    return this
+}
+
+inline fun ULong.ensureUnixCallResult(op: String, predicate: (ULong) -> Boolean): ULong {
+    if (!predicate(this)) {
+        throw Error("$op: ${strerror(posix_errno())!!.toKString()}")
+    }
+    return this
+}
+
+private fun Int.isMinusOne() = (this == -1)
+private fun Long.isMinusOne() = (this == -1L)
+private fun ULong.isMinusOne() = (this == ULong.MAX_VALUE)