fs: throw fs.lstat{Sync} errors in JS

PR-URL: nodejs#17914
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/fs.js

@@ -1123,7 +1123,11 @@ fs.lstatSync = function(path) {
   handleError((path = getPathFromURL(path)));
   nullCheck(path);
   validatePath(path);
-  binding.lstat(pathModule.toNamespacedPath(path));
+  const ctx = { path };
+  binding.lstat(pathModule.toNamespacedPath(path), undefined, ctx);
+  if (ctx.errno !== undefined) {
+    throw new errors.uvException(ctx);
+  }
   return statsFromValues();
 };
 
@@ -1874,7 +1878,11 @@ fs.realpathSync = function realpathSync(p, options) {
 
   // On windows, check that the root exists. On unix there is no need.
   if (isWindows && !knownHard[base]) {
-    binding.lstat(pathModule.toNamespacedPath(base));
+    const ctx = { path: base };
+    binding.lstat(pathModule.toNamespacedPath(base), undefined, ctx);
+    if (ctx.errno !== undefined) {
+      throw new errors.uvException(ctx);
+    }
     knownHard[base] = true;
   }
 
@@ -1914,7 +1922,11 @@ fs.realpathSync = function realpathSync(p, options) {
       // for our internal use.
 
       var baseLong = pathModule.toNamespacedPath(base);
-      binding.lstat(baseLong);
+      const ctx = { path: base };
+      binding.lstat(baseLong, undefined, ctx);
+      if (ctx.errno !== undefined) {
+        throw new errors.uvException(ctx);
+      }
 
       if ((statValues[1/*mode*/] & S_IFMT) !== S_IFLNK) {
         knownHard[base] = true;
@@ -1957,7 +1969,11 @@ fs.realpathSync = function realpathSync(p, options) {
 
     // On windows, check that the root exists. On unix there is no need.
     if (isWindows && !knownHard[base]) {
-      binding.lstat(pathModule.toNamespacedPath(base));
+      const ctx = { path: base };
+      binding.lstat(pathModule.toNamespacedPath(base), undefined, ctx);
+      if (ctx.errno !== undefined) {
+        throw new errors.uvException(ctx);
+      }
       knownHard[base] = true;
     }
   }

src/node_file.cc

@@ -563,6 +563,7 @@ static void Stat(const FunctionCallbackInfo<Value>& args) {
 
 static void LStat(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
+  Local<Context> context = env->context();
 
   CHECK_GE(args.Length(), 1);
 
@@ -573,10 +574,14 @@ static void LStat(const FunctionCallbackInfo<Value>& args) {
     CHECK_EQ(args.Length(), 2);
     AsyncCall(env, args, "lstat", UTF8, AfterStat,
               uv_fs_lstat, *path);
-  } else {  // lstat(path)
-    SYNC_CALL(lstat, *path, *path)
-    FillStatsArray(env->fs_stats_field_array(),
-                   static_cast<const uv_stat_t*>(SYNC_REQ.ptr));
+  } else {  // lstat(path, undefined, ctx)
+    CHECK_EQ(args.Length(), 3);
+    fs_req_wrap req_wrap;
+    int err = SyncCall(env, args[2], &req_wrap, "lstat", uv_fs_lstat, *path);
+    if (err == 0) {
+      FillStatsArray(env->fs_stats_field_array(),
+                     static_cast<const uv_stat_t*>(req_wrap.req.ptr));
+    }
   }
 }