szaszm commented on code in PR #2269:
URL: https://github.com/apache/nifi-minifi-cpp/pull/2269#discussion_r4167620752


##########
core-framework/common/src/utils/Environment.cpp:
##########
@@ -107,7 +107,13 @@ bool Environment::unsetEnvironmentVariable(const char* 
name) {
 
   Environment::accessEnvironment([&success, name](){
 #ifdef WIN32
-    success = SetEnvironmentVariableA(name, nullptr);
+  const bool crt_success = _putenv_s(name, "") == 0;
+  bool windows_success = SetEnvironmentVariableA(name, nullptr) != 0;
+  if (!windows_success && GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
+    windows_success = true;
+  }
+
+  success = crt_success && windows_success;

Review Comment:
   Well, the `_putenv_s, _wputenv_s, _tputenv_s` page indicated that narrow 
_environ and wide string _wenviron environments are separate. Is it possible 
that the syscalls widen the narrow string and modify _wenviron?



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