fs: throw errors from fs.fdatasyncSync in JS

PR-URL: nodejs#18348
Refs: nodejs#18106
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/fs.js

@@ -1029,7 +1029,11 @@ fs.fdatasync = function(fd, callback) {
 
 fs.fdatasyncSync = function(fd) {
   validateUint32(fd, 'fd');
-  return binding.fdatasync(fd);
+  const ctx = {};
+  binding.fdatasync(fd, undefined, ctx);
+  if (ctx.errno !== undefined) {
+    throw new errors.uvException(ctx);
+  }
 };
 
 fs.fsync = function(fd, callback) {

src/node_file.cc

@@ -735,16 +735,21 @@ static void FTruncate(const FunctionCallbackInfo<Value>& args) {
 static void Fdatasync(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
 
-  CHECK(args[0]->IsInt32());
+  const int argc = args.Length();
+  CHECK_GE(argc, 2);
 
-  int fd = args[0]->Int32Value();
+  CHECK(args[0]->IsInt32());
+  const int fd = args[0]->As<Int32>()->Value();
 
-  if (args[1]->IsObject()) {
-    CHECK_EQ(args.Length(), 2);
+  if (args[1]->IsObject()) {  // fdatasync(fd, req)
+    CHECK_EQ(argc, 2);
     AsyncCall(env, args, "fdatasync", UTF8, AfterNoArgs,
               uv_fs_fdatasync, fd);
-  } else {
-    SYNC_CALL(fdatasync, 0, fd)
+  } else {  // fdatasync(fd, undefined, ctx)
+    CHECK_EQ(argc, 3);
+    fs_req_wrap req_wrap;
+    SyncCall(env, args[2], &req_wrap, "fdatasync",
+             uv_fs_fdatasync, fd);
   }
 }
 

test/parallel/test-fs-error-messages.js

@@ -482,3 +482,24 @@ function re(literals, ...values) {
     validateError
   );
 }
+
+// fdatasync
+{
+  const validateError = (err) => {
+    assert.strictEqual(err.message, 'EBADF: bad file descriptor, fdatasync');
+    assert.strictEqual(err.errno, uv.UV_EBADF);
+    assert.strictEqual(err.code, 'EBADF');
+    assert.strictEqual(err.syscall, 'fdatasync');
+    return true;
+  };
+
+  const fd = fs.openSync(existingFile, 'r');
+  fs.closeSync(fd);
+
+  fs.fdatasync(fd, common.mustCall(validateError));
+
+  assert.throws(
+    () => fs.fdatasyncSync(fd),
+    validateError
+  );
+}