tty, win: fix read stop for raw mode

New Windows version requires `EventType` to be set to something
meaningful, otherwise WriteConsoleInputW() will fail with
`ERROR_INVALID_PARAMETER`. This sets it to `FOCUS_EVENT` which
is ignored by `uv_process_tty_read_raw_req()`.

Fixes: https://github.com/nodejs/node/issues/21773
PR-URL: https://github.com/libuv/libuv/pull/1989
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Jameson Nash <vtjnash@gmail.com>

src/win/tty.c

@@ -1033,6 +1033,7 @@ int uv_tty_read_stop(uv_tty_t* handle) {
     /* Cancel raw read. Write some bullshit event to force the console wait to
      * return. */
     memset(&record, 0, sizeof record);
+    record.EventType = FOCUS_EVENT;
     if (!WriteConsoleInputW(handle->handle, &record, 1, &written)) {
       return GetLastError();
     }

test/test-list.h

@@ -50,6 +50,7 @@ TEST_DECLARE   (tty)
 TEST_DECLARE   (tty_raw)
 TEST_DECLARE   (tty_empty_write)
 TEST_DECLARE   (tty_large_write)
+TEST_DECLARE   (tty_raw_cancel)
 #endif
 TEST_DECLARE   (tty_file)
 TEST_DECLARE   (tty_pty)
@@ -480,6 +481,7 @@ TASK_LIST_START
   TEST_ENTRY  (tty_raw)
   TEST_ENTRY  (tty_empty_write)
   TEST_ENTRY  (tty_large_write)
+  TEST_ENTRY  (tty_raw_cancel)
 #endif
   TEST_ENTRY  (tty_file)
   TEST_ENTRY  (tty_pty)

test/test-tty.c

@@ -310,6 +310,41 @@ TEST_IMPL(tty_large_write) {
   MAKE_VALGRIND_HAPPY();
   return 0;
 }
+
+TEST_IMPL(tty_raw_cancel) {
+  int r;
+  int ttyin_fd;
+  uv_tty_t tty_in;
+  uv_loop_t* loop;
+  HANDLE handle;
+
+  loop = uv_default_loop();
+  /* Make sure we have an FD that refers to a tty */
+  handle = CreateFileA("conin$",
+                       GENERIC_READ | GENERIC_WRITE,
+                       FILE_SHARE_READ | FILE_SHARE_WRITE,
+                       NULL,
+                       OPEN_EXISTING,
+                       FILE_ATTRIBUTE_NORMAL,
+                       NULL);
+  ASSERT(handle != INVALID_HANDLE_VALUE);
+  ttyin_fd = _open_osfhandle((intptr_t) handle, 0);
+  ASSERT(ttyin_fd >= 0);
+  ASSERT(UV_TTY == uv_guess_handle(ttyin_fd));
+
+  r = uv_tty_init(uv_default_loop(), &tty_in, ttyin_fd, 1);  /* Readable. */
+  ASSERT(r == 0);
+  r = uv_tty_set_mode(&tty_in, UV_TTY_MODE_RAW);
+  ASSERT(r == 0);
+  r = uv_read_start((uv_stream_t*)&tty_in, tty_raw_alloc, tty_raw_read);
+  ASSERT(r == 0);
+
+  r = uv_read_stop((uv_stream_t*) &tty_in);
+  ASSERT(r == 0);
+
+  MAKE_VALGRIND_HAPPY();
+  return 0;
+}
 #endif