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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/*
* Helper program for killing lingering python[_d].exe processes before
* building, thus attempting to avoid build failures due to files being
* locked.
*/
#include <windows.h>
#include <wchar.h>
#include <tlhelp32.h>
#include <stdio.h>
#pragma comment(lib, "psapi")
#ifdef _DEBUG
#define PYTHON_EXE (L"python_d.exe")
#define PYTHON_EXE_LEN (12)
#define KILL_PYTHON_EXE (L"kill_python_d.exe")
#define KILL_PYTHON_EXE_LEN (17)
#else
#define PYTHON_EXE (L"python.exe")
#define PYTHON_EXE_LEN (10)
#define KILL_PYTHON_EXE (L"kill_python.exe")
#define KILL_PYTHON_EXE_LEN (15)
#endif
int
main(int argc, char **argv)
{
HANDLE hp, hsp, hsm; /* process, snapshot processes, snapshot modules */
DWORD dac, our_pid;
size_t len;
wchar_t path[MAX_PATH+1];
MODULEENTRY32W me;
PROCESSENTRY32W pe;
me.dwSize = sizeof(MODULEENTRY32W);
pe.dwSize = sizeof(PROCESSENTRY32W);
memset(path, 0, MAX_PATH+1);
our_pid = GetCurrentProcessId();
hsm = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, our_pid);
if (hsm == INVALID_HANDLE_VALUE) {
printf("CreateToolhelp32Snapshot[1] failed: %d\n", GetLastError());
return 1;
}
if (!Module32FirstW(hsm, &me)) {
printf("Module32FirstW[1] failed: %d\n", GetLastError());
CloseHandle(hsm);
return 1;
}
/*
* Enumerate over the modules for the current process in order to find
* kill_process[_d].exe, then take a note of the directory it lives in.
*/
do {
if (_wcsnicmp(me.szModule, KILL_PYTHON_EXE, KILL_PYTHON_EXE_LEN))
continue;
len = wcsnlen_s(me.szExePath, MAX_PATH) - KILL_PYTHON_EXE_LEN;
wcsncpy_s(path, MAX_PATH+1, me.szExePath, len);
break;
} while (Module32NextW(hsm, &me));
CloseHandle(hsm);
if (path == NULL) {
printf("failed to discern directory of running process\n");
return 1;
}
/*
* Take a snapshot of system processes. Enumerate over the snapshot,
* looking for python processes. When we find one, verify it lives
* in the same directory we live in. If it does, kill it. If we're
* unable to kill it, treat this as a fatal error and return 1.
*
* The rationale behind this is that we're called at the start of the
* build process on the basis that we'll take care of killing any
* running instances, such that the build won't encounter permission
* denied errors during linking. If we can't kill one of the processes,
* we can't provide this assurance, and the build shouldn't start.
*/
hsp = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
if (hsp == INVALID_HANDLE_VALUE) {
printf("CreateToolhelp32Snapshot[2] failed: %d\n", GetLastError());
return 1;
}
if (!Process32FirstW(hsp, &pe)) {
printf("Process32FirstW failed: %d\n", GetLastError());
CloseHandle(hsp);
return 1;
}
dac = PROCESS_QUERY_INFORMATION | PROCESS_VM_READ | PROCESS_TERMINATE;
do {
/*
* XXX TODO: if we really wanted to be fancy, we could check the
* modules for all processes (not just the python[_d].exe ones)
* and see if any of our DLLs are loaded (i.e. python30[_d].dll),
* as that would also inhibit our ability to rebuild the solution.
* Not worth loosing sleep over though; for now, a simple check
* for just the python executable should be sufficient.
*/
if (_wcsnicmp(pe.szExeFile, PYTHON_EXE, PYTHON_EXE_LEN))
/* This isn't a python process. */
continue;
/* It's a python process, so figure out which directory it's in... */
hsm = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pe.th32ProcessID);
if (hsm == INVALID_HANDLE_VALUE)
/*
* If our module snapshot fails (which will happen if we don't own
* the process), just ignore it and continue. (It seems different
* versions of Windows return different values for GetLastError()
* in this situation; it's easier to just ignore it and move on vs.
* stopping the build for what could be a false positive.)
*/
continue;
if (!Module32FirstW(hsm, &me)) {
printf("Module32FirstW[2] failed: %d\n", GetLastError());
CloseHandle(hsp);
CloseHandle(hsm);
return 1;
}
do {
if (_wcsnicmp(me.szModule, PYTHON_EXE, PYTHON_EXE_LEN))
/* Wrong module, we're looking for python[_d].exe... */
continue;
if (_wcsnicmp(path, me.szExePath, len))
/* Process doesn't live in our directory. */
break;
/* Python process residing in the right directory, kill it! */
hp = OpenProcess(dac, FALSE, pe.th32ProcessID);
if (!hp) {
printf("OpenProcess failed: %d\n", GetLastError());
CloseHandle(hsp);
CloseHandle(hsm);
return 1;
}
if (!TerminateProcess(hp, 1)) {
printf("TerminateProcess failed: %d\n", GetLastError());
CloseHandle(hsp);
CloseHandle(hsm);
CloseHandle(hp);
return 1;
}
CloseHandle(hp);
break;
} while (Module32NextW(hsm, &me));
CloseHandle(hsm);
} while (Process32NextW(hsp, &pe));
CloseHandle(hsp);
return 0;
}
/* vi: set ts=8 sw=4 sts=4 expandtab */
|