win: map ERROR_ELEVATION_REQUIRED to UV_EACCES

uv_spawn() on Windows will fail with ERROR_ELEVATION_REQUIRED (740) if
attempting to run an application that requires elevation.

Add a Windows test that calls uv_spawn() with a helper .exe that
requires elevated permissions. Test should either run successfully if
run with Administrator privileges or fail with the mapped error.

Refs: nodejs/node#9464

src/win/error.c

@@ -71,6 +71,7 @@ int uv_translate_sys_error(int sys_errno) {
   switch (sys_errno) {
     case ERROR_NOACCESS:                    return UV_EACCES;
     case WSAEACCES:                         return UV_EACCES;
+    case ERROR_ELEVATION_REQUIRED:          return UV_EACCES;
     case ERROR_ADDRESS_ALREADY_ASSOCIATED:  return UV_EADDRINUSE;
     case WSAEADDRINUSE:                     return UV_EADDRINUSE;
     case WSAEADDRNOTAVAIL:                  return UV_EADDRNOTAVAIL;

test/elevation.c

@@ -0,0 +1,3 @@
+int main(int argc, char **argv) {
+    return 0;
+}

test/test-error.c

@@ -53,6 +53,7 @@ TEST_IMPL(error_message) {
 TEST_IMPL(sys_error) {
 #if defined(_WIN32)
   ASSERT(uv_translate_sys_error(ERROR_NOACCESS) == UV_EACCES);
+  ASSERT(uv_translate_sys_error(ERROR_ELEVATION_REQUIRED) == UV_EACCES);
   ASSERT(uv_translate_sys_error(WSAEADDRINUSE) == UV_EADDRINUSE);
   ASSERT(uv_translate_sys_error(ERROR_BAD_PIPE) == UV_EPIPE);
 #else

test/test-list.h

@@ -230,6 +230,9 @@ TEST_DECLARE   (spawn_fails)
 #ifndef _WIN32
 TEST_DECLARE   (spawn_fails_check_for_waitpid_cleanup)
 #endif
+#ifdef _WIN32
+TEST_DECLARE   (spawn_requires_elevation)
+#endif
 TEST_DECLARE   (spawn_exit_code)
 TEST_DECLARE   (spawn_stdout)
 TEST_DECLARE   (spawn_stdin)
@@ -656,6 +659,9 @@ TASK_LIST_START
   TEST_ENTRY  (spawn_fails)
 #ifndef _WIN32
   TEST_ENTRY  (spawn_fails_check_for_waitpid_cleanup)
+#endif
+#ifdef _WIN32
+  TEST_ENTRY  (spawn_requires_elevation)
 #endif
   TEST_ENTRY  (spawn_exit_code)
   TEST_ENTRY  (spawn_stdout)

test/test-spawn.c

@@ -215,6 +215,52 @@ TEST_IMPL(spawn_fails_check_for_waitpid_cleanup) {
 #endif
 
 
+#ifdef _WIN32
+TEST_IMPL(spawn_requires_elevation) {
+  int r;
+  uv_fs_t req;
+  char path[1024];
+  size_t path_size = 1024;
+
+  /* Find helper elevation.exe -- Assumed in same location as test runner */
+  r = uv_exepath(exepath, &exepath_size);
+  ASSERT(r == 0);
+  exepath[exepath_size] = '\0';
+  snprintf(path, path_size, "%s\\..\\elevation.exe", exepath);
+  uv_loop_t* loop = uv_default_loop();
+  ASSERT(0 == uv_fs_realpath(loop, &req, path, NULL));
+
+  /*
+   * Windows XP and Server 2003 don't support GetFinalPathNameByHandleW()
+   */
+  if (req.result == UV_ENOSYS) {
+    uv_fs_req_cleanup(&req);
+    RETURN_SKIP("realpath is not supported on Windows XP");
+  }
+
+  ASSERT(req.ptr != NULL);
+
+  init_process_options("", fail_cb);
+  options.file = options.args[0] = req.ptr;
+
+  printf("Launching %s\n", (char*) req.ptr);
+  r = uv_spawn(uv_default_loop(), &process, &options);
+  printf("r = %d, %s - %s\n", r, uv_err_name(r), uv_strerror(r));
+
+  /*
+   * Will either succeed or fail depending on whether test is being run with
+   * elevated permissions
+   */
+  ASSERT(r == 0 || r == UV_EACCES);
+  uv_close((uv_handle_t*) &process, NULL);
+  ASSERT(0 == uv_run(uv_default_loop(), UV_RUN_DEFAULT));
+
+  MAKE_VALGRIND_HAPPY();
+  return 0;
+}
+#endif
+
+
 TEST_IMPL(spawn_exit_code) {
   int r;
 

uv.gyp

@@ -311,7 +311,6 @@
         }],
       ]
     },
-
     {
       'target_name': 'run-tests',
       'type': 'executable',
@@ -569,5 +568,27 @@
         },
       },
     },
-  ]
+  ],
+  'conditions': [
+    ['OS=="win"', {
+      'targets': [
+        {
+          'target_name': 'elevation',
+          'type': 'executable',
+          'sources': [
+            'test/elevation.c'
+          ],
+          'msvs_settings': {
+            'VCLinkerTool': {
+              'UACExecutionLevel': 2, # requireAdministrator
+              'UACUIAccess': 'false',
+            },
+            'VCManifestTool': {
+              'EmbedManifest': 'true',
+            }
+          },
+        }
+      ],
+    }],
+  ],
 }