--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/logging/logFileOutput.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+#ifndef SHARE_VM_LOGGING_LOGFILEOUTPUT_HPP
+#define SHARE_VM_LOGGING_LOGFILEOUTPUT_HPP
+
+#include "logging/logFileStreamOutput.hpp"
+#include "runtime/semaphore.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+class LogDecorations;
+
+// The log file output, with support for file rotation based on a target size.
+class LogFileOutput : public LogFileStreamOutput {
+ private:
+  static const char* const FileOpenMode;
+  static const char* const FileCountOptionKey;
+  static const char* const FileSizeOptionKey;
+  static const char* const PidFilenamePlaceholder;
+  static const char* const TimestampFilenamePlaceholder;
+  static const char* const TimestampFormat;
+  static const size_t DefaultFileCount = 5;
+  static const size_t DefaultFileSize = 20 * M;
+  static const size_t StartTimeBufferSize = 20;
+  static const size_t PidBufferSize = 21;
+  static const uint   MaxRotationFileCount = 1000;
+  static char         _pid_str[PidBufferSize];
+  static char         _vm_start_time_str[StartTimeBufferSize];
+
+  const char* _name;
+  char* _file_name;
+  char* _archive_name;
+
+  uint  _current_file;
+  uint  _file_count;
+  uint  _file_count_max_digits;
+
+  size_t  _archive_name_len;
+  size_t  _rotate_size;
+  size_t  _current_size;
+
+  // Semaphore used for synchronizing file rotations and writes
+  Semaphore _rotation_semaphore;
+
+  void archive();
+  void rotate();
+  bool parse_options(const char* options, outputStream* errstream);
+  char *make_file_name(const char* file_name, const char* pid_string, const char* timestamp_string);
+
+  bool should_rotate() {
+    return _file_count > 0 && _rotate_size > 0 && _current_size >= _rotate_size;
+  }
+
+  void increment_file_count() {
+    _current_file++;
+    if (_current_file == _file_count) {
+      _current_file = 0;
+    }
+  }
+
+ public:
+  LogFileOutput(const char *name);
+  virtual ~LogFileOutput();
+  virtual bool initialize(const char* options, outputStream* errstream);
+  virtual int write(const LogDecorations& decorations, const char* msg);
+  virtual int write(LogMessageBuffer::Iterator msg_iterator);
+  virtual void force_rotate();
+  virtual void describe(outputStream *out);
+
+  virtual const char* name() const {
+    return _name;
+  }
+
+  static const char* const Prefix;
+  static void set_file_name_parameters(jlong start_time);
+};
+
+#endif // SHARE_VM_LOGGING_LOGFILEOUTPUT_HPP