diff -r c7a3e57fdf4a -r b985cbb00e68 src/share/vm/runtime/os.hpp
--- a/src/share/vm/runtime/os.hpp	Thu Aug 01 03:44:03 2019 +0100
+++ b/src/share/vm/runtime/os.hpp	Mon Aug 12 18:30:40 2019 +0300
@@ -556,6 +556,7 @@
   //File i/o operations
 
   static size_t read(int fd, void *buf, unsigned int nBytes);
+  static size_t read_at(int fd, void *buf, unsigned int nBytes, jlong offset);
   static size_t restartable_read(int fd, void *buf, unsigned int nBytes);
   static size_t write(int fd, const void *buf, unsigned int nBytes);
 
@@ -604,6 +605,16 @@
   // Unload library
   static void  dll_unload(void *lib);
 
+  // Callback for loaded module information
+  // Input parameters:
+  //    char*     module_file_name,
+  //    address   module_base_addr,
+  //    address   module_top_addr,
+  //    void*     param
+  typedef int (*LoadedModulesCallbackFunc)(const char *, address, address, void *);
+
+  static int get_loaded_modules_info(LoadedModulesCallbackFunc callback, void *param);
+
   // Return the handle of this process
   static void* get_default_process_handle();