Make the name of the event source for SYSLOG configurable.

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 "base/win/eventlog_messages.h"
 
 #include <windows.h>
 #elif defined(OS_LINUX)
 #include <syslog.h>
 #endif
 
 #include <cstring>
 #include <ostream>
 #include <string>
 
 namespace logging {
 
+#if defined(OS_WIN)
+
+namespace {
+std::string g_event_source_name;

[grt (UTC plus 2), 2016/11/25 15:25:34]

non-POD globals are banned
(https://google.github.io/styleguide/cppguide.html#Static_and_Global_Variables).
you could use std::string* and leak it at exit. or use a Leaky LazyInstance if
it's possible for the setter and getters to race. maybe you can avoid that if
you dictate that the setter must be called during single-threaded
initialization.

[pastarmovj, 2016/11/28 12:23:03]

Done.

+}
+
+void SetEventSourceName(const std::string& name) {
+  g_event_source_name = name;
+}
+#endif  // defined(OS_WIN)
+
 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 g_event_source_name is empty (which it is per default) this call will
+  // fail and SYSLOG will degrade gracefully to regular LOG with an extra error
+  // suffix. If you see this happening most probably you are using SYSLOG before
+  // you called SetEventSourceName.
+  HANDLE event_log_handle =
+      RegisterEventSourceA(NULL, g_event_source_name.c_str());
   if (event_log_handle == NULL) {
     stream() << " !!NOT ADDED TO EVENTLOG!!";
     return;
   }
 
   std::string message(log_message_.str());
   WORD log_type = EVENTLOG_ERROR_TYPE;
   switch (log_message_.severity()) {
     case LOG_INFO:
       log_type = EVENTLOG_INFORMATION_TYPE;
@@ skipping 37 matching lines @@
     case LOG_FATAL:
       priority = 2;
       break;
   }
   syslog(priority, "%s", log_message_.str().c_str());
   closelog();
 #endif  // defined(OS_WIN)
 }
 
 }  // namespace logging