fix(win32): use ffi to get around bun raw input/ctrl+c issues (#13052)

packages/opencode/src/cli/cmd/tui/app.tsx

@@ -3,6 +3,7 @@ import { Clipboard } from "@tui/util/clipboard"
 import { TextAttributes } from "@opentui/core"
 import { RouteProvider, useRoute } from "@tui/context/route"
 import { Switch, Match, createEffect, untrack, ErrorBoundary, createSignal, onMount, batch, Show, on } from "solid-js"
+import { win32DisableProcessedInput, win32FlushInputBuffer, win32InstallCtrlCGuard } from "./win32"
 import { Installation } from "@/installation"
 import { Flag } from "@/flag/flag"
 import { DialogProvider, useDialog } from "@tui/ui/dialog"
@@ -110,8 +111,17 @@ export function tui(input: {
 }) {
   // promise to prevent immediate exit
   return new Promise<void>(async (resolve) => {
+    const unguard = win32InstallCtrlCGuard()
+    win32DisableProcessedInput()
+
     const mode = await getTerminalBackgroundColor()
+
+    // Re-clear after getTerminalBackgroundColor() — setRawMode(false) restores
+    // the original console mode which re-enables ENABLE_PROCESSED_INPUT.
+    win32DisableProcessedInput()
+
     const onExit = async () => {
+      unguard?.()
       await input.onExit?.()
       resolve()
     }
@@ -730,7 +740,8 @@ function ErrorComponent(props: {
   const handleExit = async () => {
     renderer.setTerminalTitle("")
     renderer.destroy()
-    props.onExit()
+    win32FlushInputBuffer()
+    await props.onExit()
   }
 
   useKeyboard((evt) => {

packages/opencode/src/cli/cmd/tui/attach.ts

@@ -1,5 +1,6 @@
 import { cmd } from "../cmd"
 import { tui } from "./app"
+import { win32DisableProcessedInput, win32InstallCtrlCGuard } from "./win32"
 
 export const AttachCommand = cmd({
   command: "attach <url>",
@@ -26,6 +27,10 @@ export const AttachCommand = cmd({
         describe: "basic auth password (defaults to OPENCODE_SERVER_PASSWORD)",
       }),
   handler: async (args) => {
+    const unguard = win32InstallCtrlCGuard()
+    try {
+      win32DisableProcessedInput()
+
       const directory = (() => {
         if (!args.dir) return undefined
         try {
@@ -48,5 +53,8 @@ export const AttachCommand = cmd({
         directory,
         headers,
       })
+    } finally {
+      unguard?.()
+    }
   },
 })

packages/opencode/src/cli/cmd/tui/context/exit.tsx

@@ -1,6 +1,7 @@
 import { useRenderer } from "@opentui/solid"
 import { createSimpleContext } from "./helper"
 import { FormatError, FormatUnknownError } from "@/cli/error"
+import { win32FlushInputBuffer } from "../win32"
 type Exit = ((reason?: unknown) => Promise<void>) & {
   message: {
     set: (value?: string) => () => void
@@ -32,6 +33,7 @@ export const { use: useExit, provider: ExitProvider } = createSimpleContext({
         // Reset window title before destroying renderer
         renderer.setTerminalTitle("")
         renderer.destroy()
+        win32FlushInputBuffer()
         await input.onExit?.()
         if (reason) {
           const formatted = FormatError(reason) ?? FormatUnknownError(reason)

packages/opencode/src/cli/cmd/tui/thread.ts

@@ -9,6 +9,7 @@ import { Log } from "@/util/log"
 import { withNetworkOptions, resolveNetworkOptions } from "@/cli/network"
 import type { Event } from "@opencode-ai/sdk/v2"
 import type { EventSource } from "./context/sdk"
+import { win32DisableProcessedInput, win32InstallCtrlCGuard } from "./win32"
 
 declare global {
   const OPENCODE_WORKER_PATH: string
@@ -77,9 +78,18 @@ export const TuiThreadCommand = cmd({
         describe: "agent to use",
       }),
   handler: async (args) => {
+    // Keep ENABLE_PROCESSED_INPUT cleared even if other code flips it.
+    // (Important when running under `bun run` wrappers on Windows.)
+    const unguard = win32InstallCtrlCGuard()
+    try {
+      // Must be the very first thing — disables CTRL_C_EVENT before any Worker
+      // spawn or async work so the OS cannot kill the process group.
+      win32DisableProcessedInput()
+
       if (args.fork && !args.continue && !args.session) {
         UI.error("--fork requires --continue or --session")
-      process.exit(1)
+        process.exitCode = 1
+        return
       }
 
       // Resolve relative paths against PWD to preserve behavior when using --cwd flag
@@ -171,5 +181,8 @@ export const TuiThreadCommand = cmd({
       }, 1000)
 
       await tuiPromise
+    } finally {
+      unguard?.()
+    }
   },
 })

packages/opencode/src/cli/cmd/tui/win32.ts

@@ -0,0 +1,129 @@
+import { dlopen, ptr } from "bun:ffi"
+
+const STD_INPUT_HANDLE = -10
+const ENABLE_PROCESSED_INPUT = 0x0001
+
+const kernel = () =>
+  dlopen("kernel32.dll", {
+    GetStdHandle: { args: ["i32"], returns: "ptr" },
+    GetConsoleMode: { args: ["ptr", "ptr"], returns: "i32" },
+    SetConsoleMode: { args: ["ptr", "u32"], returns: "i32" },
+    FlushConsoleInputBuffer: { args: ["ptr"], returns: "i32" },
+  })
+
+let k32: ReturnType<typeof kernel> | undefined
+
+function load() {
+  if (process.platform !== "win32") return false
+  try {
+    k32 ??= kernel()
+    return true
+  } catch {
+    return false
+  }
+}
+
+/**
+ * Clear ENABLE_PROCESSED_INPUT on the console stdin handle.
+ */
+export function win32DisableProcessedInput() {
+  if (process.platform !== "win32") return
+  if (!process.stdin.isTTY) return
+  if (!load()) return
+
+  const handle = k32!.symbols.GetStdHandle(STD_INPUT_HANDLE)
+  const buf = new Uint32Array(1)
+  if (k32!.symbols.GetConsoleMode(handle, ptr(buf)) === 0) return
+
+  const mode = buf[0]!
+  if ((mode & ENABLE_PROCESSED_INPUT) === 0) return
+  k32!.symbols.SetConsoleMode(handle, mode & ~ENABLE_PROCESSED_INPUT)
+}
+
+/**
+ * Discard any queued console input (mouse events, key presses, etc.).
+ */
+export function win32FlushInputBuffer() {
+  if (process.platform !== "win32") return
+  if (!process.stdin.isTTY) return
+  if (!load()) return
+
+  const handle = k32!.symbols.GetStdHandle(STD_INPUT_HANDLE)
+  k32!.symbols.FlushConsoleInputBuffer(handle)
+}
+
+let unhook: (() => void) | undefined
+
+/**
+ * Keep ENABLE_PROCESSED_INPUT disabled.
+ *
+ * On Windows, Ctrl+C becomes a CTRL_C_EVENT (instead of stdin input) when
+ * ENABLE_PROCESSED_INPUT is set. Various runtimes can re-apply console modes
+ * (sometimes on a later tick), and the flag is console-global, not per-process.
+ *
+ * We combine:
+ * - A `setRawMode(...)` hook to re-clear after known raw-mode toggles.
+ * - A low-frequency poll as a backstop for native/external mode changes.
+ */
+export function win32InstallCtrlCGuard() {
+  if (process.platform !== "win32") return
+  if (!process.stdin.isTTY) return
+  if (!load()) return
+  if (unhook) return unhook
+
+  const stdin = process.stdin as any
+  const original = stdin.setRawMode
+
+  const handle = k32!.symbols.GetStdHandle(STD_INPUT_HANDLE)
+  const buf = new Uint32Array(1)
+
+  if (k32!.symbols.GetConsoleMode(handle, ptr(buf)) === 0) return
+  const initial = buf[0]!
+
+  const enforce = () => {
+    if (k32!.symbols.GetConsoleMode(handle, ptr(buf)) === 0) return
+    const mode = buf[0]!
+    if ((mode & ENABLE_PROCESSED_INPUT) === 0) return
+    k32!.symbols.SetConsoleMode(handle, mode & ~ENABLE_PROCESSED_INPUT)
+  }
+
+  // Some runtimes can re-apply console modes on the next tick; enforce twice.
+  const later = () => {
+    enforce()
+    setImmediate(enforce)
+  }
+
+  let wrapped: ((mode: boolean) => unknown) | undefined
+
+  if (typeof original === "function") {
+    wrapped = (mode: boolean) => {
+      const result = original.call(stdin, mode)
+      later()
+      return result
+    }
+
+    stdin.setRawMode = wrapped
+  }
+
+  // Ensure it's cleared immediately too (covers any earlier mode changes).
+  later()
+
+  const interval = setInterval(enforce, 100)
+  interval.unref()
+
+  let done = false
+  unhook = () => {
+    if (done) return
+    done = true
+
+    clearInterval(interval)
+    if (wrapped && stdin.setRawMode === wrapped) {
+      stdin.setRawMode = original
+    }
+
+    k32!.symbols.SetConsoleMode(handle, initial)
+    unhook = undefined
+  }
+
+  return unhook
+}