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

PR-URL: nodejs#17914
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: joyeecheung

lib/fs.js

@@ -441,7 +441,11 @@ fs.existsSync = function(path) {
       return false;
     }
     nullCheck(path);
-    binding.stat(pathModule.toNamespacedPath(path));
+    const ctx = { path };
+    binding.stat(pathModule.toNamespacedPath(path), undefined, ctx);
+    if (ctx.errno !== undefined) {
+      return false;
+    }
     return true;
   } catch (e) {
     return false;
@@ -1127,7 +1131,11 @@ fs.statSync = function(path) {
   handleError((path = getPathFromURL(path)));
   nullCheck(path);
   validatePath(path);
-  binding.stat(pathModule.toNamespacedPath(path));
+  const ctx = { path };
+  binding.stat(pathModule.toNamespacedPath(path), undefined, ctx);
+  if (ctx.errno !== undefined) {
+    throw new errors.uvException(ctx);
+  }
   return statsFromValues();
 };
 
@@ -1927,7 +1935,11 @@ fs.realpathSync = function realpathSync(p, options) {
         }
       }
       if (linkTarget === null) {
-        binding.stat(baseLong);
+        const ctx = { path: base };
+        binding.stat(baseLong, undefined, ctx);
+        if (ctx.errno !== undefined) {
+          throw new errors.uvException(ctx);
+        }
         linkTarget = binding.readlink(baseLong);
       }
       resolvedLink = pathModule.resolve(previous, linkTarget);

src/node_file.cc

@@ -539,6 +539,7 @@ static void InternalModuleStat(const FunctionCallbackInfo<Value>& args) {
 
 static void Stat(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
+  Local<Context> context = env->context();
 
   CHECK_GE(args.Length(), 1);
 
@@ -549,10 +550,14 @@ static void Stat(const FunctionCallbackInfo<Value>& args) {
     CHECK_EQ(args.Length(), 2);
     AsyncCall(env, args, "stat", UTF8, AfterStat,
               uv_fs_stat, *path);
-  } else {  // stat(path)
-    SYNC_CALL(stat, *path, *path)
-    FillStatsArray(env->fs_stats_field_array(),
-                   static_cast<const uv_stat_t*>(SYNC_REQ.ptr));
+  } else {  // stat(path, undefined, ctx)
+    CHECK_EQ(args.Length(), 3);
+    fs_req_wrap req_wrap;
+    int err = SyncCall(env, args[2], &req_wrap, "stat", uv_fs_stat, *path);
+    if (err == 0) {
+      FillStatsArray(env->fs_stats_field_array(),
+                     static_cast<const uv_stat_t*>(req_wrap.req.ptr));
+    }
   }
 }