Make printf and LOG output to cmd console for Windows

base/process_util_win.cc

 // Copyright (c) 2012 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/process_util.h"
 
 #include <fcntl.h>
 #include <io.h>
 #include <windows.h>
 #include <userenv.h>
@@ skipping 52 matching lines @@
 // Prints the exception call stack.
 // This is the unit tests exception filter.
 long WINAPI StackDumpExceptionFilter(EXCEPTION_POINTERS* info) {
   debug::StackTrace(info).PrintBacktrace();
   if (g_previous_filter)
     return g_previous_filter(info);
   return EXCEPTION_CONTINUE_SEARCH;
 }
 
 // Connects back to a console if available.
 void AttachToConsole() {

[brettw, 2012/08/19 23:26:46]

Maybe just rename this one and move out of the anon namespace so there's only on
version (rather than having both AttachToConsole and RouteStdioToConsole as
doing the same thing)?

[jbates, 2012/08/20 17:43:00]

Done.

+  static bool g_attached = false;
+  if (g_attached)
+    return;
+  g_attached = true;
+
   if (!AttachConsole(ATTACH_PARENT_PROCESS)) {

[M-A Ruel, 2012/08/20 12:42:29]

This already takes care of not doing it 2 times in a row. Lines 74-77 are not
needed.

[jbates, 2012/08/20 17:43:00]

Done.

     unsigned int result = GetLastError();
     // Was probably already attached.
     if (result == ERROR_ACCESS_DENIED)
       return;
 
     if (result == ERROR_INVALID_HANDLE || result == ERROR_INVALID_HANDLE) {
       // TODO(maruel): Walk up the process chain if deemed necessary.
     }
     // Continue even if the function call fails.
     AllocConsole();
@@ skipping 75 matching lines @@
   // TerminateProcess should do for us. Don't check for the result code since
   // it fails quite often. This should be investigated eventually.
   base::KillProcess(process_, kProcessKilledExitCode, false);
 
   // Now, just cleanup as if the process exited normally.
   OnObjectSignaled(process_);
 }
 
 }  // namespace
 
+void RouteStdioToConsole() {
+  AttachToConsole();
+}
+
 ProcessId GetCurrentProcId() {
   return ::GetCurrentProcessId();
 }
 
 ProcessHandle GetCurrentProcessHandle() {
   return ::GetCurrentProcess();
 }
 
 HMODULE GetModuleFromAddress(void* address) {
   HMODULE instance = NULL;
@@ skipping 815 matching lines @@
 
   PERFORMANCE_INFORMATION info;
   if (!InternalGetPerformanceInfo(&info, sizeof(info))) {
     DLOG(ERROR) << "Failed to fetch internal performance info.";
     return 0;
   }
   return (info.CommitTotal * system_info.dwPageSize) / 1024;
 }
 
 }  // namespace base