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) 109 * and see if any of our DLLs are loaded (i.e. python30[_d].dll), 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 */ 179
