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