Martin v. Löwis | 3c6938d | 2008-06-13 23:34:35 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Helper program for killing lingering python[_d].exe processes before |
| 3 | * building, thus attempting to avoid build failures due to files being |
| 4 | * locked. |
| 5 | */ |
| 6 | |
| 7 | #include <windows.h> |
| 8 | #include <wchar.h> |
| 9 | #include <tlhelp32.h> |
| 10 | #include <stdio.h> |
| 11 | |
| 12 | #pragma comment(lib, "psapi") |
| 13 | |
| 14 | #ifdef _DEBUG |
| 15 | #define PYTHON_EXE (L"python_d.exe") |
| 16 | #define PYTHON_EXE_LEN (12) |
| 17 | #define KILL_PYTHON_EXE (L"kill_python_d.exe") |
| 18 | #define KILL_PYTHON_EXE_LEN (17) |
| 19 | #else |
| 20 | #define PYTHON_EXE (L"python.exe") |
| 21 | #define PYTHON_EXE_LEN (10) |
| 22 | #define KILL_PYTHON_EXE (L"kill_python.exe") |
| 23 | #define KILL_PYTHON_EXE_LEN (15) |
| 24 | #endif |
| 25 | |
| 26 | int |
| 27 | main(int argc, char **argv) |
| 28 | { |
| 29 | HANDLE hp, hsp, hsm; /* process, snapshot processes, snapshot modules */ |
| 30 | DWORD dac, our_pid; |
| 31 | size_t len; |
| 32 | wchar_t path[MAX_PATH+1]; |
| 33 | |
| 34 | MODULEENTRY32W me; |
| 35 | PROCESSENTRY32W pe; |
| 36 | |
| 37 | me.dwSize = sizeof(MODULEENTRY32W); |
| 38 | pe.dwSize = sizeof(PROCESSENTRY32W); |
| 39 | |
| 40 | memset(path, 0, MAX_PATH+1); |
| 41 | |
| 42 | our_pid = GetCurrentProcessId(); |
| 43 | |
| 44 | hsm = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, our_pid); |
| 45 | if (hsm == INVALID_HANDLE_VALUE) { |
| 46 | printf("CreateToolhelp32Snapshot[1] failed: %d\n", GetLastError()); |
| 47 | return 1; |
| 48 | } |
| 49 | |
| 50 | if (!Module32FirstW(hsm, &me)) { |
| 51 | printf("Module32FirstW[1] failed: %d\n", GetLastError()); |
| 52 | CloseHandle(hsm); |
| 53 | return 1; |
| 54 | } |
| 55 | |
| 56 | /* |
| 57 | * Enumerate over the modules for the current process in order to find |
| 58 | * kill_process[_d].exe, then take a note of the directory it lives in. |
| 59 | */ |
| 60 | do { |
| 61 | if (_wcsnicmp(me.szModule, KILL_PYTHON_EXE, KILL_PYTHON_EXE_LEN)) |
| 62 | continue; |
| 63 | |
| 64 | len = wcsnlen_s(me.szExePath, MAX_PATH) - KILL_PYTHON_EXE_LEN; |
| 65 | wcsncpy_s(path, MAX_PATH+1, me.szExePath, len); |
| 66 | |
| 67 | break; |
| 68 | |
| 69 | } while (Module32NextW(hsm, &me)); |
| 70 | |
| 71 | CloseHandle(hsm); |
| 72 | |
| 73 | if (path == NULL) { |
| 74 | printf("failed to discern directory of running process\n"); |
| 75 | return 1; |
| 76 | } |
| 77 | |
| 78 | /* |
| 79 | * Take a snapshot of system processes. Enumerate over the snapshot, |
| 80 | * looking for python processes. When we find one, verify it lives |
| 81 | * in the same directory we live in. If it does, kill it. If we're |
| 82 | * unable to kill it, treat this as a fatal error and return 1. |
| 83 | * |
| 84 | * The rationale behind this is that we're called at the start of the |
| 85 | * build process on the basis that we'll take care of killing any |
| 86 | * running instances, such that the build won't encounter permission |
| 87 | * denied errors during linking. If we can't kill one of the processes, |
| 88 | * we can't provide this assurance, and the build shouldn't start. |
| 89 | */ |
| 90 | |
| 91 | hsp = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0); |
| 92 | if (hsp == INVALID_HANDLE_VALUE) { |
| 93 | printf("CreateToolhelp32Snapshot[2] failed: %d\n", GetLastError()); |
| 94 | return 1; |
| 95 | } |
| 96 | |
| 97 | if (!Process32FirstW(hsp, &pe)) { |
| 98 | printf("Process32FirstW failed: %d\n", GetLastError()); |
| 99 | CloseHandle(hsp); |
| 100 | return 1; |
| 101 | } |
| 102 | |
| 103 | dac = PROCESS_QUERY_INFORMATION | PROCESS_VM_READ | PROCESS_TERMINATE; |
| 104 | do { |
| 105 | |
| 106 | /* |
| 107 | * XXX TODO: if we really wanted to be fancy, we could check the |
| 108 | * modules for all processes (not just the python[_d].exe ones) |
Georg Brandl | fa2c61a | 2011-02-20 10:41:31 +0000 | [diff] [blame^] | 109 | * and see if any of our DLLs are loaded (i.e. python33[_d].dll), |
Martin v. Löwis | 3c6938d | 2008-06-13 23:34:35 +0000 | [diff] [blame] | 110 | * as that would also inhibit our ability to rebuild the solution. |
| 111 | * Not worth loosing sleep over though; for now, a simple check |
| 112 | * for just the python executable should be sufficient. |
| 113 | */ |
| 114 | |
| 115 | if (_wcsnicmp(pe.szExeFile, PYTHON_EXE, PYTHON_EXE_LEN)) |
| 116 | /* This isn't a python process. */ |
| 117 | continue; |
| 118 | |
| 119 | /* It's a python process, so figure out which directory it's in... */ |
| 120 | hsm = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pe.th32ProcessID); |
| 121 | if (hsm == INVALID_HANDLE_VALUE) |
| 122 | /* |
| 123 | * If our module snapshot fails (which will happen if we don't own |
| 124 | * the process), just ignore it and continue. (It seems different |
| 125 | * versions of Windows return different values for GetLastError() |
| 126 | * in this situation; it's easier to just ignore it and move on vs. |
| 127 | * stopping the build for what could be a false positive.) |
| 128 | */ |
| 129 | continue; |
| 130 | |
| 131 | if (!Module32FirstW(hsm, &me)) { |
| 132 | printf("Module32FirstW[2] failed: %d\n", GetLastError()); |
| 133 | CloseHandle(hsp); |
| 134 | CloseHandle(hsm); |
| 135 | return 1; |
| 136 | } |
| 137 | |
| 138 | do { |
| 139 | if (_wcsnicmp(me.szModule, PYTHON_EXE, PYTHON_EXE_LEN)) |
| 140 | /* Wrong module, we're looking for python[_d].exe... */ |
| 141 | continue; |
| 142 | |
| 143 | if (_wcsnicmp(path, me.szExePath, len)) |
| 144 | /* Process doesn't live in our directory. */ |
| 145 | break; |
| 146 | |
| 147 | /* Python process residing in the right directory, kill it! */ |
| 148 | hp = OpenProcess(dac, FALSE, pe.th32ProcessID); |
| 149 | if (!hp) { |
| 150 | printf("OpenProcess failed: %d\n", GetLastError()); |
| 151 | CloseHandle(hsp); |
| 152 | CloseHandle(hsm); |
| 153 | return 1; |
| 154 | } |
| 155 | |
| 156 | if (!TerminateProcess(hp, 1)) { |
| 157 | printf("TerminateProcess failed: %d\n", GetLastError()); |
| 158 | CloseHandle(hsp); |
| 159 | CloseHandle(hsm); |
| 160 | CloseHandle(hp); |
| 161 | return 1; |
| 162 | } |
| 163 | |
| 164 | CloseHandle(hp); |
| 165 | break; |
| 166 | |
| 167 | } while (Module32NextW(hsm, &me)); |
| 168 | |
| 169 | CloseHandle(hsm); |
| 170 | |
| 171 | } while (Process32NextW(hsp, &pe)); |
| 172 | |
| 173 | CloseHandle(hsp); |
| 174 | |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | /* vi: set ts=8 sw=4 sts=4 expandtab */ |