Adds new logging type SYSLOG which logs to the system log.

base/syslog_logging.cc

+// Copyright 2016 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.
+
+#include "base/debug/stack_trace.h"
+#include "base/syslog_logging.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#elif defined(OS_LINUX)
+#include <syslog.h>
+#endif
+
+#include <cstring>
+#include <ostream>
+#include <string>
+
+namespace logging {
+
+EventLogMessage::EventLogMessage(const char* file,
+                                 int line,
+                                 LogSeverity severity)
+    : log_message_(file, line, severity) {
+}
+
+EventLogMessage::~EventLogMessage() {
+#if defined(OS_WIN)
+  const char kEventSource[] = "chrome";
+  HANDLE event_log_handle = RegisterEventSourceA(NULL, kEventSource);
+  if (event_log_handle == NULL) {
+    stream() << " !!NOT ADDED TO EVENTLOG!!";
+    return;
+  }
+
+  std::string message(log_message_.str());
+  LPCSTR strings[1] = {message.data()};
+  WORD log_type = EVENTLOG_ERROR_TYPE;
+  switch (log_message_.severity()) {
+    case LOG_INFO:
+      log_type = EVENTLOG_INFORMATION_TYPE;
+      break;
+    case LOG_WARNING:
+      log_type = EVENTLOG_WARNING_TYPE;
+      break;
+    case LOG_ERROR:
+    case LOG_FATAL:
+      // The price of getting the stack trace is not worth the hassle for
+      // non-error conditions.
+      base::debug::StackTrace trace;
+      message.append(trace.ToString());
+      log_type = EVENTLOG_ERROR_TYPE;
+      break;
+  }
+  // TODO(pastarmovj): Register Chrome's event log resource types to make the
+  // entries nicer. 1337 is just a made up event id type.
+  if (!ReportEventA(event_log_handle, log_type, 0, 1337, NULL, 1, 0,
+                    strings, NULL)) {
+    stream() << " !!NOT ADDED TO EVENTLOG!!";
+  }
+  DeregisterEventSource(event_log_handle);
+#elif defined(OS_LINUX)
+  const char kEventSource[] = "chrome";
+  openlog(kEventSource, LOG_NOWAIT | LOG_PID, LOG_USER);
+  // We can't use the defined names for the logging severity from syslog.h
+  // because they collide with the names of our own severity levels. Therefore
+  // we use the actual values which of course do not match ours.
+  // See sys/syslog.h for reference.
+  int priority = 3;
+  switch (log_message_.severity()) {
+    case LOG_INFO:
+      priority = 6;
+      break;
+    case LOG_WARNING:
+      priority = 4;
+      break;
+    case LOG_ERROR:
+      priority = 3;
+      break;
+    case LOG_FATAL:
+      priority = 2;
+      break;
+  }
+  syslog(priority, "%s", log_message_.str().c_str());
+  closelog();
+#endif  // defined(OS_WIN)
+}
+
+}  // namespace logging