Make POSIX SIGTERM/SIGINT/SIGHUP handler async signal safe.

base/logging.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_LOGGING_H_
 #define BASE_LOGGING_H_
 
 #include <string>
 #include <cstring>
 #include <sstream>
@@ skipping 754 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(ErrnoLogMessage);
 };
 #endif  // OS_WIN
 
 // Closes the log file explicitly if open.
 // NOTE: Since the log file is opened as necessary by the action of logging
 //       statements, there's no guarantee that it will stay closed
 //       after this call.
 void CloseLogFile();
 
+// Async signal safe logging mechanism.
+void RawLog(int level, const char* message);
+
+#define RAW_LOG(level, message) logging::RawLog(logging::LOG_ ## level, message)
+
+#define RAW_CHECK(condition)                                                   \
+  do {                                                                         \
+    if (!(condition))                                                          \
+      logging::RawLog(logging::LOG_FATAL, "Check failed: " #condition "\n");   \
+  } while (0)
+
 }  // namespace logging
 
 // These functions are provided as a convenience for logging, which is where we
 // use streams (it is against Google style to use streams in other places). It
 // is designed to allow you to emit non-ASCII Unicode strings to the log file,
 // which is normally ASCII. It is relatively slow, so try not to use it for
 // common cases. Non-ASCII characters will be converted to UTF-8 by these
 // operators.
 std::ostream& operator<<(std::ostream& out, const wchar_t* wstr);
 inline std::ostream& operator<<(std::ostream& out, const std::wstring& wstr) {
@@ skipping 36 matching lines @@
 #elif NOTIMPLEMENTED_POLICY == 4
 #define NOTIMPLEMENTED() LOG(ERROR) << NOTIMPLEMENTED_MSG
 #elif NOTIMPLEMENTED_POLICY == 5
 #define NOTIMPLEMENTED() do {\
   static int count = 0;\
   LOG_IF(ERROR, 0 == count++) << NOTIMPLEMENTED_MSG;\
 } while(0)
 #endif
 
 #endif  // BASE_LOGGING_H_