--- old/src/hotspot/share/utilities/vmError.hpp	2018-09-27 17:31:00.537583941 +0530
+++ new/src/hotspot/share/utilities/vmError.hpp	2018-09-27 17:31:00.417583942 +0530
@@ -88,6 +88,9 @@
 
   static bool _error_reported;
 
+  // Whether fork and exec should call fork/vfork
+  static bool _vfork_mode;
+
  public:
 
   // set signal handlers on Solaris/Linux or the default exception filter
@@ -190,6 +193,8 @@
   // Support for avoiding multiple asserts
   static bool is_error_reported();
 
+  static bool is_forkmode_vfork();
+
   // Test vmassert(), fatal(), guarantee(), etc.
   NOT_PRODUCT(static void test_error_handler();)
   NOT_PRODUCT(static void controlled_crash(int how);)