rewrite init to restart failed processes, add file renaming, directory creation, directory renaming, directory removal, add process killing, unify shells, readme changes.

code/kernel/kmain.c

@@ -303,21 +303,6 @@ static PROCESS* LaunchUserProcess(const char* filePath, const char* args) {
     // Caller owns the reference returned by KeCreateProcess.
     return proc;
 }
-// ---------------------------------------------------------------------------
-// Kernel thread: wait for a process to exit, then log a message and shut down.
-// Takes ownership of the PROCESS* reference passed as arg; releases it on exit.
-// ---------------------------------------------------------------------------
-static void ProcessWatcherThread(void* arg) {
-    PROCESS* proc = (PROCESS*)arg;
-    KeWaitForEvent(proc->ExitEvent);
-    DbgPrint("ProcessWatcherThread: Process \"%s\" (PID %u) exited with code %d.\n",
-             proc->Name, proc->ProcessId, proc->ExitCode);
-    ObDereferenceObject(&proc->Header);
-
-    DbgPrint("ProcessWatcherThread: Shutting down.\n");
-    gKmainHal->Power.Shutdown();  // does not return
-}
-
 static void PrintProcessList() {
     LIST_ENTRY* listHead = KeGetProcessList();
     LIST_ENTRY* current;
@@ -354,20 +339,29 @@ void SystemInitThread(void* arg) {
     DbgPrint("  -> Kernel Pool:  %.2f MB\n", (float)MmGetKernelPoolUsage() / (1024.0f * 1024.0f));
     DbgPrint("  -> User Heap:    %.2f MB\n", (float)MmGetUserHeapUsage() / (1024.0f * 1024.0f));
 
-    // Launch User-Mode Shell (this will trigger AHCI & FAT32 which CAN safely block now)
-    PROCESS* shellProc = LaunchUserProcess("system/init.exe", args->bootInfo->CommandLine);
-
-    if (shellProc) {
-        KSTATUS ws = KeCreateKernelThread((uintptr_t)ProcessWatcherThread,
-                                          (uintptr_t)shellProc,
-                                          PriorityNormal, (THREAD**)0);
-        if (!KSUCCESS(ws)) {
-            DbgPrint("SystemInitThread: Failed to create watcher thread (%d) -- leaking proc ref.\n", ws);
+    // Launch User-Mode init.exe and restart it until it exits cleanly.
+    while (true) {
+        PROCESS* shellProc = LaunchUserProcess("system/init.exe", args->bootInfo->CommandLine);
+        if (!shellProc) {
+            DbgPrint("SystemInitThread: Failed to start system/init.exe; retrying.\n");
+            KeYield();
+            continue;
         }
+
+        KeWaitForEvent(shellProc->ExitEvent);
+        int exitCode = shellProc->ExitCode;
+        DbgPrint("SystemInitThread: init.exe exited with code %d.\n", exitCode);
+        ObDereferenceObject(&shellProc->Header);
+
+        if (exitCode == 0) break;
+        DbgPrint("SystemInitThread: Restarting init.exe.\n");
     }
 
+    DbgPrint("SystemInitThread: init.exe completed successfully; shutting down.\n");
+    gKmainHal->Power.Shutdown();
     MmFreePool(args);
 }
+
 // ---------------------------------------------------------------------------
 // Main Kernel Entry
 // ---------------------------------------------------------------------------