src: extract GetTransparentHugePagesConfiguration function to read sy…

…stem huge tables configuration on Linux-based systems

src/large_pages/node_large_page.cc

@@ -257,24 +257,30 @@ struct text_region FindNodeTextRegion() {
 }
 
 #if defined(__linux__)
-bool IsTransparentHugePagesEnabled() {
-  std::ifstream ifs;
+std::istream *GetTransparentHugePagesConfiguration() {
+  std::ifstream *ifs = new std::ifstream();
 
-  ifs.open("/sys/kernel/mm/transparent_hugepage/enabled");
-  if (!ifs) {
+  ifs->open("/sys/kernel/mm/transparent_hugepage/enabled");
+  if (!*ifs) {
     PrintWarning("could not open /sys/kernel/mm/transparent_hugepage/enabled");
+    return nullptr;
+  }
+
+  return ifs;
+}
+
+bool IsTransparentHugePagesEnabled() {
+  std::istream *configuration = GetTransparentHugePagesConfiguration();
+  if (configuration == nullptr) {
     return false;
   }
 
   bool enabled = false;
-  if (ifs.is_open()) {
-    std::string token;
-    while (ifs >> token) {
-      enabled = enabled || token == "[always]" || token == "[madvise]";
-    }
+  std::string token;
+  while (*configuration >> token) {
+    enabled = enabled || token == "[always]" || token == "[madvise]";
   }
-  ifs.close();
-
+  delete configuration;
   return enabled;
 }
 #elif defined(__FreeBSD__)