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diff --git a/src/shrpx_log_config.h b/src/shrpx_log_config.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2014 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef SHRPX_LOG_CONFIG_H
+#define SHRPX_LOG_CONFIG_H
+
+#include "shrpx.h"
+
+#include <sys/types.h>
+
+#include <chrono>
+
+#include "template.h"
+
+using namespace nghttp2;
+
+namespace shrpx {
+
+struct Timestamp {
+  Timestamp(const std::chrono::system_clock::time_point &tp);
+
+  std::array<char, sizeof("03/Jul/2014:00:19:38 +0900")> time_local_buf;
+  std::array<char, sizeof("2014-11-15T12:58:24.741+09:00")> time_iso8601_buf;
+  std::array<char, sizeof("Mon, 10 Oct 2016 10:25:58 GMT")> time_http_buf;
+  StringRef time_local;
+  StringRef time_iso8601;
+  StringRef time_http;
+};
+
+struct LogConfig {
+  std::chrono::system_clock::time_point time_str_updated;
+  std::shared_ptr<Timestamp> tstamp;
+  std::string thread_id;
+  pid_t pid;
+  int accesslog_fd;
+  int errorlog_fd;
+  // true if errorlog_fd is referring to a terminal.
+  bool errorlog_tty;
+
+  LogConfig();
+  // Updates time stamp if difference between time_str_updated and now
+  // is 1 or more milliseconds.
+  void update_tstamp_millis(const std::chrono::system_clock::time_point &now);
+  // Updates time stamp if difference between time_str_updated and
+  // now, converted to time_t, is 1 or more seconds.
+  void update_tstamp(const std::chrono::system_clock::time_point &now);
+};
+
+// We need LogConfig per thread to avoid data race around opening file
+// descriptor for log files.
+LogConfig *log_config();
+
+// Deletes log_config
+void delete_log_config();
+
+} // namespace shrpx
+
+#endif // SHRPX_LOG_CONFIG_H