fs: throw errors from fs.fsyncSync in JS

PR-URL: https://github.com/nodejs/node/pull/18348
Refs: https://github.com/nodejs/node/issues/18106
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/fs.js

@@ -1045,7 +1045,11 @@ fs.fsync = function(fd, callback) {
 
 fs.fsyncSync = function(fd) {
   validateUint32(fd, 'fd');
-  return binding.fsync(fd);
+  const ctx = {};
+  binding.fsync(fd, undefined, ctx);
+  if (ctx.errno !== undefined) {
+    throw new errors.uvException(ctx);
+  }
 };
 
 fs.mkdir = function(path, mode, callback) {

src/node_file.cc

@@ -739,7 +739,7 @@ static void Fdatasync(const FunctionCallbackInfo<Value>& args) {
   CHECK_GE(argc, 2);
 
   CHECK(args[0]->IsInt32());
-  const int fd = args[0]->As<Int32>()->Value();
+  const int fd = args[0].As<Int32>()->Value();
 
   if (args[1]->IsObject()) {  // fdatasync(fd, req)
     CHECK_EQ(argc, 2);
@@ -756,16 +756,21 @@ static void Fdatasync(const FunctionCallbackInfo<Value>& args) {
 static void Fsync(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
 
+  const int argc = args.Length();
+  CHECK_GE(argc, 2);
+
   CHECK(args[0]->IsInt32());
+  const int fd = args[0].As<Int32>()->Value();
 
-  int fd = args[0]->Int32Value();
+  if (args[1]->IsObject()) {  // fsync(fd, req)
-
+    CHECK_EQ(argc, 2);
-  if (args[1]->IsObject()) {
-    CHECK_EQ(args.Length(), 2);
     AsyncCall(env, args, "fsync", UTF8, AfterNoArgs,
               uv_fs_fsync, fd);
-  } else {
+  } else {  // fsync(fd, undefined, ctx)
-    SYNC_CALL(fsync, 0, fd)
+    CHECK_EQ(argc, 3);
+    fs_req_wrap req_wrap;
+    SyncCall(env, args[2], &req_wrap, "fsync",
+             uv_fs_fsync, fd);
   }
 }
 

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

@@ -503,3 +503,24 @@ function re(literals, ...values) {
     validateError
   );
 }
+
+// fsync
+{
+  const validateError = (err) => {
+    assert.strictEqual(err.message, 'EBADF: bad file descriptor, fsync');
+    assert.strictEqual(err.errno, uv.UV_EBADF);
+    assert.strictEqual(err.code, 'EBADF');
+    assert.strictEqual(err.syscall, 'fsync');
+    return true;
+  };
+
+  const fd = fs.openSync(existingFile, 'r');
+  fs.closeSync(fd);
+
+  fs.fsync(fd, common.mustCall(validateError));
+
+  assert.throws(
+    () => fs.fsyncSync(fd),
+    validateError
+  );
+}