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// Copyright (c) 2011 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/debug_on_start_win.h"
#include <windows.h>
#include "base/base_switches.h"
#include "base/basictypes.h"
#include "base/debug/debugger.h"
namespace base {
namespace debug {
// Minimalist implementation to try to find a command line argument. We can use
// kernel32 exported functions but not the CRT functions because we're too early
// in the process startup.
// The code is not that bright and will find things like ---argument or
// /-/argument.
// Note: command_line is non-destructively modified.
bool DebugOnStart::FindArgument(wchar_t* command_line, const char* argument_c) {
wchar_t argument[50] = {};
for (int i = 0; argument_c[i]; ++i)
argument[i] = argument_c[i];
int argument_len = lstrlen(argument);
int command_line_len = lstrlen(command_line);
while (command_line_len > argument_len) {
wchar_t first_char = command_line[0];
wchar_t last_char = command_line[argument_len+1];
// Try to find an argument.
if ((first_char == L'-' || first_char == L'/') &&
(last_char == L' ' || last_char == 0 || last_char == L'=')) {
command_line[argument_len+1] = 0;
// Skip the - or /
if (lstrcmpi(command_line+1, argument) == 0) {
// Found it.
command_line[argument_len+1] = last_char;
return true;
}
// Fix back.
command_line[argument_len+1] = last_char;
}
// Continue searching.
++command_line;
--command_line_len;
}
return false;
}
// static
int __cdecl DebugOnStart::Init() {
// Try to find the argument.
if (FindArgument(GetCommandLine(), switches::kDebugOnStart)) {
// We can do 2 things here:
// - Ask for a debugger to attach to us. This involve reading the registry
// key and creating the process.
// - Do a int3.
// It will fails if we run in a sandbox. That is expected.
base::debug::SpawnDebuggerOnProcess(GetCurrentProcessId());
// Wait for a debugger to come take us.
base::debug::WaitForDebugger(60, false);
} else if (FindArgument(GetCommandLine(), switches::kWaitForDebugger)) {
// Wait for a debugger to come take us.
base::debug::WaitForDebugger(60, true);
}
return 0;
}
} // namespace debug
} // namespace base
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