1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <windows.h>
#include "base/basictypes.h"
#include "base/debug_util.h"
namespace {
// Minimalist key reader.
// Note: Does not use the CRT.
bool RegReadString(HKEY root, const wchar_t* subkey,
const wchar_t* value_name, wchar_t* buffer, int* len) {
HKEY key = NULL;
DWORD res = RegOpenKeyEx(root, subkey, 0, KEY_READ, &key);
if (ERROR_SUCCESS != res || key == NULL)
return false;
DWORD type = 0;
DWORD buffer_size = *len * sizeof(wchar_t);
// We don't support REG_EXPAND_SZ.
res = RegQueryValueEx(key, value_name, NULL, &type,
reinterpret_cast<BYTE*>(buffer), &buffer_size);
if (ERROR_SUCCESS == res && buffer_size != 0 && type == REG_SZ) {
// Make sure the buffer is NULL terminated.
buffer[*len - 1] = 0;
*len = lstrlen(buffer);
RegCloseKey(key);
return true;
}
RegCloseKey(key);
return false;
}
// Replaces each "%ld" in input per a value. Not efficient but it works.
// Note: Does not use the CRT.
bool StringReplace(const wchar_t* input, int value, wchar_t* output,
int output_len) {
memset(output, 0, output_len*sizeof(wchar_t));
int input_len = lstrlen(input);
for (int i = 0; i < input_len; ++i) {
int current_output_len = lstrlen(output);
if (input[i] == L'%' && input[i + 1] == L'l' && input[i + 2] == L'd') {
// Make sure we have enough place left.
if ((current_output_len + 12) >= output_len)
return false;
// Cheap _itow().
wsprintf(output+current_output_len, L"%d", value);
i += 2;
} else {
if (current_output_len >= output_len)
return false;
output[current_output_len] = input[i];
}
}
return true;
}
} // namespace
// Note: Does not use the CRT.
bool DebugUtil::SpawnDebuggerOnProcess(unsigned process_id) {
wchar_t reg_value[1026];
int len = arraysize(reg_value);
if (RegReadString(HKEY_LOCAL_MACHINE,
L"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\AeDebug",
L"Debugger", reg_value, &len)) {
wchar_t command_line[1026];
if (StringReplace(reg_value, process_id, command_line,
arraysize(command_line))) {
// We don't mind if the debugger is present because it will simply fail
// to attach to this process.
STARTUPINFO startup_info = {0};
startup_info.cb = sizeof(startup_info);
PROCESS_INFORMATION process_info = {0};
if (CreateProcess(NULL, command_line, NULL, NULL, FALSE, 0, NULL, NULL,
&startup_info, &process_info)) {
CloseHandle(process_info.hThread);
WaitForInputIdle(process_info.hProcess, 10000);
CloseHandle(process_info.hProcess);
return true;
}
}
}
return false;
}
// Note: Does not use the CRT.
bool DebugUtil::WaitForDebugger(int wait_seconds, bool silent) {
for (int i = 0; i < wait_seconds * 10; ++i) {
if (IsDebuggerPresent()) {
if (!silent) {
// If you hit here, you just use -debug-on-start or -debug-children.
__debugbreak();
}
return true;
}
Sleep(100);
}
return false;
}
|
