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+// Copyright 2022 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: log/globals.h
+// -----------------------------------------------------------------------------
+//
+// This header declares global logging library configuration knobs.
+
+#ifndef ABSL_LOG_GLOBALS_H_
+#define ABSL_LOG_GLOBALS_H_
+
+#include "absl/base/attributes.h"
+#include "absl/base/config.h"
+#include "absl/base/log_severity.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+//------------------------------------------------------------------------------
+//  Minimum Log Level
+//------------------------------------------------------------------------------
+//
+// Messages logged at or above this severity are directed to all registered log
+// sinks or skipped otherwise. This parameter can also be modified using
+// command line flag --minloglevel.
+// See absl/base/log_severity.h for descriptions of severity levels.
+
+// MinLogLevel()
+//
+// Returns the value of the Minimum Log Level parameter.
+// This function is async-signal-safe.
+ABSL_MUST_USE_RESULT absl::LogSeverityAtLeast MinLogLevel();
+
+// SetMinLogLevel()
+//
+// Updates the value of Minimum Log Level parameter.
+// This function is async-signal-safe.
+void SetMinLogLevel(absl::LogSeverityAtLeast severity);
+
+namespace log_internal {
+
+// ScopedMinLogLevel
+//
+// RAII type used to temporarily update the Min Log Level parameter.
+class ScopedMinLogLevel final {
+ public:
+  explicit ScopedMinLogLevel(absl::LogSeverityAtLeast severity);
+  ScopedMinLogLevel(const ScopedMinLogLevel&) = delete;
+  ScopedMinLogLevel& operator=(const ScopedMinLogLevel&) = delete;
+  ~ScopedMinLogLevel();
+
+ private:
+  absl::LogSeverityAtLeast saved_severity_;
+};
+
+}  // namespace log_internal
+
+//------------------------------------------------------------------------------
+// Stderr Threshold
+//------------------------------------------------------------------------------
+//
+// Messages logged at or above this level are directed to stderr in
+// addition to other registered log sinks. This parameter can also be modified
+// using command line flag --stderrthreshold.
+// See absl/base/log_severity.h for descriptions of severity levels.
+
+// StderrThreshold()
+//
+// Returns the value of the Stderr Threshold parameter.
+// This function is async-signal-safe.
+ABSL_MUST_USE_RESULT absl::LogSeverityAtLeast StderrThreshold();
+
+// SetStderrThreshold()
+//
+// Updates the Stderr Threshold parameter.
+// This function is async-signal-safe.
+void SetStderrThreshold(absl::LogSeverityAtLeast severity);
+inline void SetStderrThreshold(absl::LogSeverity severity) {
+  absl::SetStderrThreshold(static_cast<absl::LogSeverityAtLeast>(severity));
+}
+
+// ScopedStderrThreshold
+//
+// RAII type used to temporarily update the Stderr Threshold parameter.
+class ScopedStderrThreshold final {
+ public:
+  explicit ScopedStderrThreshold(absl::LogSeverityAtLeast severity);
+  ScopedStderrThreshold(const ScopedStderrThreshold&) = delete;
+  ScopedStderrThreshold& operator=(const ScopedStderrThreshold&) = delete;
+  ~ScopedStderrThreshold();
+
+ private:
+  absl::LogSeverityAtLeast saved_severity_;
+};
+
+//------------------------------------------------------------------------------
+// Log Backtrace At
+//------------------------------------------------------------------------------
+//
+// Users can request backtrace to be logged at specific locations, specified
+// by file and line number.
+
+// ShouldLogBacktraceAt()
+//
+// Returns true if we should log a backtrace at the specified location.
+namespace log_internal {
+ABSL_MUST_USE_RESULT bool ShouldLogBacktraceAt(absl::string_view file,
+                                               int line);
+}  // namespace log_internal
+
+// SetLogBacktraceLocation()
+//
+// Sets the location the backtrace should be logged at.
+void SetLogBacktraceLocation(absl::string_view file, int line);
+
+//------------------------------------------------------------------------------
+// Prepend Log Prefix
+//------------------------------------------------------------------------------
+//
+// This option tells the logging library that every logged message
+// should include the prefix (severity, date, time, PID, etc.)
+
+// ShouldPrependLogPrefix()
+//
+// Returns the value of the Prepend Log Prefix option.
+// This function is async-signal-safe.
+ABSL_MUST_USE_RESULT bool ShouldPrependLogPrefix();
+
+// EnableLogPrefix()
+//
+// Updates the value of the Prepend Log Prefix option.
+// This function is async-signal-safe.
+void EnableLogPrefix(bool on_off);
+
+namespace log_internal {
+
+using LoggingGlobalsListener = void (*)();
+void SetLoggingGlobalsListener(LoggingGlobalsListener l);
+
+// Internal implementation for the setter routines. These are used
+// to break circular dependencies between flags and globals. Each "Raw"
+// routine corresponds to the non-"Raw" counterpart and used to set the
+// configuration parameter directly without calling back to the listener.
+void RawSetMinLogLevel(absl::LogSeverityAtLeast severity);
+void RawSetStderrThreshold(absl::LogSeverityAtLeast severity);
+void RawEnableLogPrefix(bool on_off);
+
+}  // namespace log_internal
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_LOG_GLOBALS_H_