fs: fix cb/sync writev empty array behavior

PR-URL: https://github.com/nodejs/node/pull/41932
Refs: https://github.com/nodejs/node/issues/41910
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/fs.js b/lib/fs.js
index 8810ead2a4..09e15d9402 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -906,6 +906,11 @@ function writev(fd, buffers, position, callback) {
   validateBufferArray(buffers);
   callback = maybeCallback(callback || position);
 
+  if (buffers.length === 0) {
+    process.nextTick(callback, null, 0, buffers);
+    return;
+  }
+
   const req = new FSReqCallback();
   req.oncomplete = wrapper;
 
@@ -932,6 +937,10 @@ function writevSync(fd, buffers, position) {
   fd = getValidatedFd(fd);
   validateBufferArray(buffers);
 
+  if (buffers.length === 0) {
+    return 0;
+  }
+
   const ctx = {};
 
   if (typeof position !== 'number')