fs: throw fs.chmodSync errors in JS land

PR-URL: nodejs#18871
Refs: nodejs#18106
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

lib/fs.js

@@ -1054,7 +1054,9 @@ fs.chmodSync = function(path, mode) {
   validatePath(path);
   mode = modeNum(mode);
   validateUint32(mode, 'mode');
-  return binding.chmod(pathModule.toNamespacedPath(path), mode);
+  const ctx = { path };
+  binding.chmod(pathModule.toNamespacedPath(path), mode, undefined, ctx);
+  handleErrorFromBinding(ctx);
 };
 
 if (constants.O_SYMLINK !== undefined) {

src/node_file.cc

@@ -1458,20 +1458,24 @@ static void Read(const FunctionCallbackInfo<Value>& args) {
 static void Chmod(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
 
-  CHECK_GE(args.Length(), 2);
-  CHECK(args[1]->IsInt32());
+  const int argc = args.Length();
+  CHECK_GE(argc, 2);
 
   BufferValue path(env->isolate(), args[0]);
   CHECK_NE(*path, nullptr);
 
-  int mode = static_cast<int>(args[1]->Int32Value());
+  CHECK(args[1]->IsInt32());
+  int mode = args[1].As<Int32>()->Value();
 
   FSReqBase* req_wrap = GetReqWrap(env, args[2]);
-  if (req_wrap != nullptr) {
+  if (req_wrap != nullptr) {  // chmod(path, mode, req)
     AsyncCall(env, req_wrap, args, "chmod", UTF8, AfterNoArgs,
               uv_fs_chmod, *path, mode);
-  } else {
-    SYNC_CALL(chmod, *path, *path, mode);
+  } else {  // chmod(path, mode, undefined, ctx)
+    CHECK_EQ(argc, 4);
+    fs_req_wrap req_wrap;
+    SyncCall(env, args[3], &req_wrap, "chmod",
+             uv_fs_chmod, *path, mode);
   }
 }