util: implement util.getSystemErrorName()

Reimplement uv.errname() as internal/util.getSystemErrorName() to
avoid the memory leaks caused by unknown error codes
and avoid calling into C++ for the error names. Also
expose it as a public API for external use.

PR-URL: https://github.com/nodejs/node/pull/18186
Refs: http://docs.libuv.org/en/v1.x/errors.html#c.uv_err_name
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/uv.cc b/src/uv.cc
index 3c115cf05b..1ffd093c6b 100644
--- a/src/uv.cc
+++ b/src/uv.cc
@@ -39,6 +39,8 @@ using v8::String;
 using v8::Value;
 
 
+// TODO(joyeecheung): deprecate this function in favor of
+// lib/util.getSystemErrorName()
 void ErrName(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
   int err = args[0]->Int32Value();