libchromeos: add process control library, syslog logging capability, and run unit tests

chromeos/syslog_logging.h

Index: chromeos/syslog_logging.h
diff --git a/chromeos/syslog_logging.h b/chromeos/syslog_logging.h
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+// Copyright (c) 2011 The Chromium OS 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 CHROMEOS_SYSLOG_LOGGING_H_
+#define CHROMEOS_SYSLOG_LOGGING_H_
+
+#include <string>
+
+namespace chromeos {
+
+enum InitFlags {
+  kLogToSyslog = 1,
+  kLogToStderr = 2
+};
+
+// Initialize logging subsystem.  |flags| indicates
+void InitLog(int init_flags);
+// Convenience function for configuring syslog via openlog.  Users
+// could call openlog directly except for naming collisions between
+// base/logging.h and syslog.h.  Similarly users cannot pass the
+// normal parameters so we pick a representative set.  |log_pid|
+// causes pid to be logged with |ident|.
+void OpenLog(const char* ident, bool log_pid);
+// Start accumulating the logs to a string.  This is inefficient, so
+// do not set to true if large numbers of log messages are coming.
+// Accumulated logs are only ever cleared when the clear function ings
+// called.
+void LogToString(bool enabled);
+// Get the accumulated logs as a string.
+std::string GetLog();
+// Clear the accumulated logs.
+void ClearLog();
+// Returns true if the accumulated log contains the given string.  Useful
+// for testing.
+bool FindLog(const char* string);
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_SYSLOG_LOGGING_H_