Add process manager

src/kernel/kernel.c

@@ -146,6 +146,22 @@ duk_ret_t native_word_out(duk_context *ctx)
 // Global context for IRQ handlers
 duk_context *global_ctx = NULL;
 
+// Pending heaps to destroy
+duk_context *pending_heaps[16];
+int pending_heaps_count = 0;
+
+void process_pending_heaps()
+{
+  for (int i = 0; i < pending_heaps_count; i++)
+  {
+    if (pending_heaps[i] != NULL)
+    {
+      duk_destroy_heap(pending_heaps[i]);
+    }
+  }
+  pending_heaps_count = 0;
+}
+
 // JavaScript IRQ wrapper
 void js_irq_callback(registers_t *r)
 {
@@ -187,6 +203,9 @@ void js_irq_callback(registers_t *r)
   }
 
   duk_pop(global_ctx); // Pop stash
+
+  // Process any pending heaps
+  process_pending_heaps();
 }
 
 // Native function to register IRQ from JavaScript
@@ -616,10 +635,29 @@ duk_ret_t native_isolated_exec(duk_context *ctx)
   // duk_destroy_heap(isolated_ctx);
 
   // Return success/failure
-  duk_push_boolean(ctx, success);
+  // Return the heap pointer as a number (uint32_t)
+  duk_push_uint(ctx, (duk_uint_t)isolated_ctx);
   return 1;
 }
 
+// Native function to destroy an isolated heap
+duk_ret_t native_destroy_isolated_heap(duk_context *ctx)
+{
+  // Get the heap pointer
+  duk_uint_t heap_ptr = duk_require_uint(ctx, 0);
+  duk_context *isolated_ctx = (duk_context *)heap_ptr;
+
+  if (isolated_ctx != NULL)
+  {
+    if (pending_heaps_count < 16)
+    {
+      pending_heaps[pending_heaps_count++] = isolated_ctx;
+    }
+  }
+
+  return 0;
+}
+
 void kmain()
 {
   // Initialize IDT and ISRs
@@ -674,6 +712,10 @@ void kmain()
   duk_push_c_function(ctx, native_isolated_exec, 1);
   duk_put_global_string(ctx, "$isolatedExec");
 
+  // Register native isolated heap destruction function
+  duk_push_c_function(ctx, native_destroy_isolated_heap, 1);
+  duk_put_global_string(ctx, "$destroyIsolatedHeap");
+
   // Enable interrupts before JavaScript execution
   __asm__ volatile("sti");
 

src/os/src/kernel/filesystem/devfs.ts

@@ -35,6 +35,9 @@ export function devfs_driver(): KFilesystemDriver {
     stat(path: string): KFilesystemStat | null {
       return devfs_statEntity(path);
     },
+    rm(path: string): void {
+      throw new Error("Cannot remove objects in devfs.")
+    }
   };
 }
 

src/os/src/kernel/filesystem/fat32.ts

@@ -75,6 +75,9 @@ export function fat32_driver(driver: any, data: any): KFilesystemDriver {
     directRead(path: string, count: number, offset: number) {
       return fat32_directRead(state, path, count, offset);
     },
+    rm(path: string): void {
+      throw new Error("Cannot remove objects in fat32.");
+    },
   };
 }
 

src/os/src/kernel/filesystem/procfs.ts

@@ -0,0 +1,168 @@
+import { Logger } from "../../lib/libstd/logger/logger.kmod";
+import { Path } from "../../lib/libstd/path";
+import type {
+  KFilesystemDriver,
+  KFilesystemEntity,
+  KFilesystemMemdata,
+  KFilesystemStat,
+} from "../../types/filesystem/fs";
+
+const procfs_data: KFilesystemMemdata = [];
+
+export function procfs_driver(): KFilesystemDriver {
+  return {
+    id: "procfs",
+    init: procfs_init,
+    listDir(path: string): KFilesystemEntity[] | null {
+      return procfs_listDir(path);
+    },
+    readFile(path: string): unknown {
+      return procfs_readFile(path);
+    },
+    writeFile(path: string, content: unknown): void {
+      throw new Error("Cannot write files in procfs.");
+    },
+    createFile(path: string, content: unknown): void {
+      throw new Error("Cannot create files in procfs.");
+    },
+    mkdir(path: string): void {
+      throw new Error("Cannot make directories in procfs.");
+    },
+    stat(path: string): KFilesystemStat | null {
+      return procfs_statEntity(path);
+    },
+    rm(path: string): void {
+      procfs_rm(path);
+    },
+  };
+}
+
+export function procfs_init(): void {
+  procfs_data.push({
+    name: "root",
+    path: "/",
+    type: "folder",
+    size: 0,
+    contents: null,
+  });
+}
+
+export function procfs_getEntity(path: string): KFilesystemEntity | null {
+  for (let i = 0; i < procfs_data.length; i++) {
+    const entity = procfs_data[i]!;
+
+    if (entity.path === path) return entity;
+  }
+
+  return null;
+}
+
+export function procfs_statEntity(path: string): KFilesystemStat | null {
+  const entity = procfs_getEntity(path);
+  if (!entity) return null;
+
+  return {
+    name: entity.name,
+    type: entity.type,
+    size: entity.size,
+  };
+}
+
+export function procfs_mkdir(path: string): void {
+  if (procfs_getEntity(path)) return;
+
+  const parent = Path.dirname(path);
+  if (!procfs_getEntity(parent)) return;
+
+  procfs_data.push({
+    name: Path.filename(path),
+    path,
+    type: "folder",
+    size: 0,
+    contents: null,
+  });
+}
+
+export function procfs_createFile(path: string, content: unknown): void {
+  if (procfs_getEntity(path)) return;
+
+  const parent = Path.dirname(path);
+  if (!procfs_getEntity(parent)) return;
+
+  const size = String(content).length;
+
+  procfs_data.push({
+    name: Path.filename(path),
+    path,
+    type: "file",
+    size,
+    contents: content,
+  });
+}
+
+export function procfs_writeFile(path: string, content: unknown): void {
+  const entity = procfs_getEntity(path);
+  if (!entity) return procfs_createFile(path, content);
+
+  if (entity.type !== "file") return;
+
+  entity.contents = content;
+  entity.size = String(content).length;
+}
+
+export function procfs_readFile(path: string): unknown {
+  const entity = procfs_getEntity(path);
+  if (!entity) return null;
+
+  if (entity.type !== "file") return null;
+
+  return entity.contents;
+}
+
+export function procfs_listDir(path: string): KFilesystemEntity[] | null {
+  const entity = procfs_getEntity(path);
+  if (!entity) return null;
+
+  if (entity.type !== "folder") return null;
+
+  const contents: KFilesystemEntity[] = [];
+
+  for (let i = 0; i < procfs_data.length; i++) {
+    const e = procfs_data[i]!;
+
+    if (Path.dirname(e.path) === path) {
+      contents.push(e);
+    }
+  }
+
+  return contents;
+}
+
+export function procfs_rm(path: string): void {
+  const entity = procfs_getEntity(path);
+  if (!entity) return;
+
+  if (entity.type === "file") {
+    const index = procfs_data.indexOf(entity);
+
+    if (index !== -1) procfs_data.splice(index, 1);
+  } else if (entity.type === "folder") {
+    const entitiesToRemove: KFilesystemEntity[] = [];
+    const pathPrefix = path === "/" ? "/" : path + "/";
+
+    for (let i = 0; i < procfs_data.length; i++) {
+      const e = procfs_data[i]!;
+
+      if (e.path === path || e.path.startsWith(pathPrefix)) {
+        entitiesToRemove.push(e);
+      }
+    }
+
+    for (let i = 0; i < entitiesToRemove.length; i++) {
+      const toRemove = entitiesToRemove[i]!;
+      const index = procfs_data.indexOf(toRemove);
+
+      if (index !== -1) procfs_data.splice(index, 1);
+    }
+  }
+}

src/os/src/kernel/filesystem/sysfs.ts

@@ -31,6 +31,9 @@ export function sysfs_driver(): KFilesystemDriver {
     stat(path: string): KFilesystemStat | null {
       return sysfs_statEntity(path);
     },
+    rm(path: string): void {
+      throw new Error("Cannot remove objects in sysfs.");
+    },
   };
 }
 

src/os/src/kernel/index.ts

@@ -11,6 +11,7 @@ import {
 } from "./drivers/etc/serial";
 import { devfs_driver, devfs_getDevice } from "./filesystem/devfs";
 import { fat32_driver } from "./filesystem/fat32";
+import { procfs_driver } from "./filesystem/procfs";
 import { sysfs_driver, sysfs_readFile } from "./filesystem/sysfs";
 import { kmod_app_init, kmod_app_run } from "./modules/app/app.kmod";
 import { kmod_disks_detectDisks } from "./modules/disks/disks.kmod";
@@ -48,6 +49,7 @@ export function kmain() {
   kmod_filesystem_init();
   kmod_filesystem_mount("/sys", sysfs_driver);
   kmod_filesystem_mount("/dev", devfs_driver);
+  kmod_filesystem_mount("/proc", procfs_driver);
 
   Logger.log("[Kernel] Initializing terminal module...");
   kmod_terminal_input_init();
@@ -72,5 +74,5 @@ export function kmain() {
 
   const shell = uiarrtostr(kmod_filesystem_readFile("/disk/ushellc")!);
 
-  kmod_app_run(shell);
+  kmod_app_run(shell, "");
 }

src/os/src/kernel/modules/app/app.kmod.ts

@@ -9,12 +9,21 @@ import {
 } from "../filesystem/filesystem.kmod";
 import { oskrnl_register } from "../../../oskrnl";
 import { getPathEnv } from "../../../lib/sys/env";
+import {
+  procfs_mkdir,
+  procfs_readFile,
+  procfs_rm,
+  procfs_writeFile,
+} from "../../filesystem/procfs";
+
+const exitListeners: { [pid: string]: (() => void)[] } = {};
+const heapHandles: { [pid: string]: number } = {};
 
 export function kmod_app_init() {
   oskrnl_register();
 }
 
-export function kmod_app_run(path: string) {
+export function kmod_app_run(path: string, args: string) {
   const appPath = kmod_app_resolve(path);
   if (!appPath) throw new Error("App not found");
 
@@ -27,7 +36,15 @@ export function kmod_app_run(path: string) {
   const entrypoint = Path.join(appPath, meta["app:entrypoint"]);
   const code = uiarrtostr(kmod_filesystem_readFile(entrypoint)!);
 
-  iexec(code);
+  const pid = kmod_app_proc_generateId().toString();
+
+  kmod_app_proc_init(pid, meta["app:name"]!, args);
+  kmod_app_proc_registerHandle(pid, "app");
+  const heapHandle = iexec("var __oskrnl_procd_pid = " + pid + ";\n" + code);
+  if (heapHandle) heapHandles[pid] = heapHandle;
+  kmod_app_proc_unregisterHandle(pid, "app");
+
+  return pid;
 }
 
 export function kmod_app_resolve(path: string): string | null {
@@ -43,3 +60,93 @@ export function kmod_app_resolve(path: string): string | null {
 
   return null;
 }
+
+export function kmod_app_proc_generateId(): number {
+  return Math.floor(Math.random() * 0xffffffff);
+}
+
+export function kmod_app_proc_init(id: string, name: string, args: string) {
+  const root = "/" + id;
+  procfs_mkdir(root);
+  procfs_writeFile(Path.join(root, "name"), name);
+  procfs_writeFile(Path.join(root, "args"), args);
+  procfs_writeFile(Path.join(root, "pid"), id);
+  procfs_writeFile(Path.join(root, "handles"), "");
+}
+
+export function kmod_app_proc_getArgs(pid: string): string {
+  const res = procfs_readFile(Path.join("/" + pid, "args"));
+  return res as string;
+}
+
+export function kmod_app_proc_registerHandle(
+  pid: string,
+  handle: string
+): string {
+  const handles = procfs_readFile(Path.join("/" + pid, "handles")) as string;
+
+  const handlesArr = handles == "" ? [] : handles.split(",");
+  handlesArr.push(handle);
+
+  procfs_writeFile(Path.join("/" + pid, "handles"), handlesArr.join(","));
+
+  return handle;
+}
+
+export function kmod_app_proc_unregisterHandle(
+  pid: string,
+  handle: string
+): void {
+  const handles = procfs_readFile(Path.join("/" + pid, "handles")) as string;
+  if (handles == "") return;
+
+  const handlesArr = handles.split(",");
+  handlesArr.splice(handlesArr.indexOf(handle), 1);
+
+  procfs_writeFile(Path.join("/" + pid, "handles"), handlesArr.join(","));
+
+  if (handlesArr.length < 1) kmod_app_proc_handleExit(pid);
+}
+
+export function kmod_app_proc_generateHandle(): string {
+  return Math.floor(Math.random() * 0xffffffff).toString();
+}
+
+export function kmod_app_proc_handleExit(pid: string): void {
+  procfs_writeFile(Path.join("/", pid + "/handles"), "");
+  procfs_rm("/" + pid);
+
+  if (exitListeners[pid]) {
+    for (let i = 0; i < exitListeners[pid].length; i++) {
+      exitListeners[pid][i]!();
+    }
+  }
+
+  exitListeners[pid] = [];
+  delete exitListeners[pid];
+
+  if (heapHandles[pid]) {
+    $destroyIsolatedHeap(heapHandles[pid]!);
+    delete heapHandles[pid];
+  }
+}
+
+export function kmod_app_proc_running(pid: string): boolean {
+  const handles = procfs_readFile(Path.join("/" + pid, "handles")) as string;
+
+  if (handles === null || handles === undefined) return false;
+
+  return handles !== "";
+}
+
+export function kmod_app_proc_addExitListener(
+  pid: string,
+  listener: () => void
+): void {
+  if (!exitListeners[pid]) exitListeners[pid] = [];
+  exitListeners[pid].push(listener);
+}
+
+export function kmod_app_proc_exit(pid: string): void {
+  kmod_app_proc_handleExit(pid);
+}

src/os/src/kernel/modules/terminal/input.ts

@@ -8,8 +8,15 @@ export function kmod_terminal_input_init(): void {}
 
 export function kmod_terminal_input_onKeyboardInput(
   handler: (keycode: keyof typeof Keycode) => void
-) {
+): () => void {
   kmod_terminal_input_keyboardInputHandlers.push(handler);
+
+  return function () {
+    const index = kmod_terminal_input_keyboardInputHandlers.indexOf(handler);
+    if (index !== -1) {
+      kmod_terminal_input_keyboardInputHandlers.splice(index, 1);
+    }
+  };
 }
 
 export function kmod_terminal_input_handleKeyboardInput(

src/os/src/lib/libts/exec.ts

@@ -1,3 +1,3 @@
 export function iexec(code: string) {
-  $isolatedExec(code);   
+  return $isolatedExec(code);
 }

src/os/src/oskrnl/app/launcher.ts

@@ -1,8 +1,5 @@
 import { kmod_app_run } from "../../kernel/modules/app/app.kmod";
 
 export function oskrnl_app_launcher_run(path: string, args: string) {
-  if ((globalThis as any).__oskrnl) {
-    (globalThis as any).__oskrnl.app_args = args;
-  }
-  kmod_app_run(path);
+  return kmod_app_run(path, args);
 }

src/os/src/oskrnl/app/proc.ts

@@ -0,0 +1,25 @@
+import {
+  kmod_app_proc_addExitListener,
+  kmod_app_proc_exit,
+  kmod_app_proc_getArgs,
+  kmod_app_proc_running,
+} from "../../kernel/modules/app/app.kmod";
+
+export function oskrnl_app_proc_getArgs(pid: string): string {
+  return kmod_app_proc_getArgs(pid);
+}
+
+export function oskrnl_app_proc_addExitListener(
+  pid: string,
+  listener: () => void
+): void {
+  kmod_app_proc_addExitListener(pid, listener);
+}
+
+export function oskrnl_app_proc_exit(pid: string): void {
+  kmod_app_proc_exit(pid);
+}
+
+export function oskrnl_app_proc_running(pid: string): boolean {
+  return kmod_app_proc_running(pid);
+}

src/os/src/oskrnl/index.ts

@@ -1,13 +1,22 @@
 import { oskrnl_app_launcher_run } from "./app/launcher";
+import {
+  oskrnl_app_proc_addExitListener,
+  oskrnl_app_proc_exit,
+  oskrnl_app_proc_getArgs,
+  oskrnl_app_proc_running,
+} from "./app/proc";
 import { oskrnl_console_log, oskrnl_console_update } from "./console/console";
 import { oskrnl_input_onKeyPress } from "./input/input";
 
 export function oskrnl_register() {
   (globalThis as any).__oskrnl = {
-    app_args: null,
     console_log: oskrnl_console_log,
     console_update: oskrnl_console_update,
     input_onKeyPress: oskrnl_input_onKeyPress,
     app_launcher_run: oskrnl_app_launcher_run,
+    app_proc_getArgs: oskrnl_app_proc_getArgs,
+    app_proc_addExitListener: oskrnl_app_proc_addExitListener,
+    app_proc_exit: oskrnl_app_proc_exit,
+    app_proc_running: oskrnl_app_proc_running,
   };
 }

src/os/src/oskrnl/input/input.ts

@@ -1,5 +1,24 @@
+import {
+  kmod_app_proc_generateHandle,
+  kmod_app_proc_registerHandle,
+  kmod_app_proc_running,
+  kmod_app_proc_addExitListener,
+} from "../../kernel/modules/app/app.kmod";
 import { kmod_terminal_input_onKeyboardInput } from "../../kernel/modules/terminal/input";
 
-export function oskrnl_input_onKeyPress(handler: (key: string) => void) {
-  kmod_terminal_input_onKeyboardInput(handler);
+export function oskrnl_input_onKeyPress(
+  pid: string,
+  handler: (key: string) => void
+) {
+  kmod_app_proc_registerHandle(pid, kmod_app_proc_generateHandle());
+  const removeHandler = kmod_terminal_input_onKeyboardInput(function (
+    key: string
+  ) {
+    const running = kmod_app_proc_running(pid);
+    if (!running) return;
+
+    handler(key);
+  });
+
+  kmod_app_proc_addExitListener(pid, removeHandler);
 }

src/os/src/types/c/bindings.d.ts

@@ -11,5 +11,5 @@ declare const $irqregister: (
   irq: number,
   handler: (irqNum: number) => void
 ) => boolean;
-declare function $isolatedExec(code: string): void;
-
+declare function $isolatedExec(code: string): number;
+declare function $destroyIsolatedHeap(handle: number): void;

src/os/src/types/filesystem/fs.ts

@@ -17,6 +17,7 @@ export type KFilesystemDriver = {
   writeFile(path: string, content: unknown): void;
   createFile(path: string, content: unknown): void;
   mkdir(path: string): void;
+  rm(path: string): void;
   stat(path: string): KFilesystemStat | null;
   directRead?(
     path: string,

test-hdd/apps/echo/index.js

@@ -1 +1 @@
-__oskrnl.console_log(__oskrnl.app_args);
+__oskrnl.console_log(__oskrnl.app_proc_getArgs(__oskrnl_procd_pid));

test-hdd/apps/tysh/index.js

@@ -1,14 +1,13 @@
 __oskrnl.console_log("> ");
 
 var input = "";
-var inputActive = true;
+var pid = "";
 
-__oskrnl.input_onKeyPress(function (key) {
-  if (!inputActive) return;
+__oskrnl.input_onKeyPress(__oskrnl_procd_pid, function (key) {
+  if (pid != "" && __oskrnl.app_proc_running(pid)) return;
 
   if (key == "Backspace") input = input.slice(0, -1);
   else if (key == "Enter") {
-    inputActive = false;
     process();
     return;
   } else input += key.toLowerCase();
@@ -19,5 +18,14 @@ __oskrnl.input_onKeyPress(function (key) {
 function process() {
   var app = input.split(" ")[0];
   var args = input.split(" ").slice(1);
-  __oskrnl.app_launcher_run(app, args.join(" "));
+  pid = __oskrnl.app_launcher_run(app, args.join(" "));
+  __oskrnl.app_proc_addExitListener(pid, function () {
+    input = "";
+    __oskrnl.console_log("> ");
+  });
+
+  if (!__oskrnl.app_proc_running(pid)) {
+    input = "";
+    __oskrnl.console_log("> ");
+  }
 }

test-hdd/apps/wfkey/index.js

@@ -0,0 +1,6 @@
+__oskrnl.input_onKeyPress(__oskrnl_procd_pid, function (key) {
+  if (key == __oskrnl.app_proc_getArgs(__oskrnl_procd_pid)[0].toUpperCase()) {
+    __oskrnl.app_proc_exit(__oskrnl_procd_pid);
+    return;
+  }
+});

test-hdd/apps/wfkey/meta.lam

@@ -0,0 +1,5 @@
+{
+  "app:name": "wfkey",
+  "app:version": "1.0.0",
+  "app:entrypoint": "index.js"
+}