Kotlin/Native Architecture: C-Interop & LLVM Compilation

import kotlinx.cinterop.*
memScoped {
    val nativeBuffer = allocArray<ByteVar>(1024)
    posix_function(nativeBuffer)
}

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// Kotlin/Native: Low-Level C-Interop & Native Memory Management
package com.kwasacademy.nativeinterop
 
// In Kotlin/Native, standard POSIX APIs are available in platform.posix.*
import kotlinx.cinterop.*
import platform.posix.getpid
import platform.posix.printf
import platform.posix.time
import platform.posix.time_tVar
 
fun main() {
    println("=== Kotlin/Native LLVM & POSIX C-Interop Engine ===")
 
    // 1. Direct POSIX System Call: Query Process ID
    val pid = getpid()
    println("Active Native Process ID (getpid): $pid")
 
    // 2. Native Off-Heap Memory Allocation using memScoped Arena
    memScoped {
        // Allocate native C 64-bit integer on the native stack frame
        val timeLocation = alloc<time_tVar>()
 
        // Pass native pointer (timeLocation.ptr) to native C function
        time(timeLocation.ptr)
 
        val currentTimeSeconds = timeLocation.value
        println("POSIX Epoch Timestamp from native C API: $currentTimeSeconds seconds")
 
        // Allocate native C string
        val message = "Hello from Kotlin/Native LLVM compiler!
"
        val cString = message.cstr.ptr
 
        // Direct C stdio call
        printf("Direct C printf output: %s", cString)
    } // memScoped ends: ALL native C stack memory is reclaimed instantly!
 
    println("✅ Native memory freed cleanly without GC overhead.")
}