Trent Nelson | 61828c7 | 2008-04-03 20:47:30 +0000 | [diff] [blame] | 1 | /*
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| 2 | * Helper program for killing lingering python[_d].exe processes before
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| 3 | * building, thus attempting to avoid build failures due to files being
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| 4 | * locked.
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| 5 | */
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| 6 |
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| 7 | #include <windows.h>
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| 8 | #include <wchar.h>
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| 9 | #include <tlhelp32.h>
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| 10 | #include <stdio.h>
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| 11 |
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| 12 | #pragma comment(lib, "psapi")
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| 13 |
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| 14 | #ifdef _DEBUG
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| 15 | #define PYTHON_EXE (L"python_d.exe")
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| 16 | #define PYTHON_EXE_LEN (12)
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| 17 | #define KILL_PYTHON_EXE (L"kill_python_d.exe")
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| 18 | #define KILL_PYTHON_EXE_LEN (17)
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| 19 | #else
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| 20 | #define PYTHON_EXE (L"python.exe")
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| 21 | #define PYTHON_EXE_LEN (10)
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| 22 | #define KILL_PYTHON_EXE (L"kill_python.exe")
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| 23 | #define KILL_PYTHON_EXE_LEN (15)
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| 24 | #endif
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| 25 |
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| 26 | int
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| 27 | main(int argc, char **argv)
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| 28 | {
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| 29 | HANDLE hp, hsp, hsm; /* process, snapshot processes, snapshot modules */
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| 30 | DWORD dac, our_pid;
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| 31 | size_t len;
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| 32 | wchar_t path[MAX_PATH+1];
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| 33 |
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| 34 | MODULEENTRY32W me;
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| 35 | PROCESSENTRY32W pe;
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| 36 |
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| 37 | me.dwSize = sizeof(MODULEENTRY32W);
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| 38 | pe.dwSize = sizeof(PROCESSENTRY32W);
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| 39 |
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| 40 | memset(path, 0, MAX_PATH+1);
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| 41 |
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| 42 | our_pid = GetCurrentProcessId();
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| 43 |
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| 44 | hsm = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, our_pid);
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| 45 | if (hsm == INVALID_HANDLE_VALUE) {
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| 46 | printf("CreateToolhelp32Snapshot[1] failed: %d\n", GetLastError());
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| 47 | return 1;
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| 48 | }
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| 49 |
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| 50 | if (!Module32FirstW(hsm, &me)) {
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| 51 | printf("Module32FirstW[1] failed: %d\n", GetLastError());
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| 52 | CloseHandle(hsm);
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| 53 | return 1;
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| 54 | }
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| 55 |
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| 56 | /*
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| 57 | * Enumerate over the modules for the current process in order to find
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| 58 | * kill_process[_d].exe, then take a note of the directory it lives in.
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| 59 | */
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| 60 | do {
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| 61 | if (_wcsnicmp(me.szModule, KILL_PYTHON_EXE, KILL_PYTHON_EXE_LEN))
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| 62 | continue;
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| 63 |
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| 64 | len = wcsnlen_s(me.szExePath, MAX_PATH) - KILL_PYTHON_EXE_LEN;
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| 65 | wcsncpy_s(path, MAX_PATH+1, me.szExePath, len);
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| 66 |
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| 67 | break;
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| 68 |
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| 69 | } while (Module32NextW(hsm, &me));
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| 70 |
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| 71 | CloseHandle(hsm);
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| 72 |
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| 73 | if (path == NULL) {
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| 74 | printf("failed to discern directory of running process\n");
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| 75 | return 1;
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| 76 | }
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| 77 |
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| 78 | /*
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| 79 | * Take a snapshot of system processes. Enumerate over the snapshot,
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| 80 | * looking for python processes. When we find one, verify it lives
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| 81 | * in the same directory we live in. If it does, kill it. If we're
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| 82 | * unable to kill it, treat this as a fatal error and return 1.
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| 83 | *
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| 84 | * The rationale behind this is that we're called at the start of the
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| 85 | * build process on the basis that we'll take care of killing any
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| 86 | * running instances, such that the build won't encounter permission
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| 87 | * denied errors during linking. If we can't kill one of the processes,
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| 88 | * we can't provide this assurance, and the build shouldn't start.
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| 89 | */
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| 90 |
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| 91 | hsp = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
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| 92 | if (hsp == INVALID_HANDLE_VALUE) {
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| 93 | printf("CreateToolhelp32Snapshot[2] failed: %d\n", GetLastError());
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| 94 | return 1;
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| 95 | }
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| 96 |
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| 97 | if (!Process32FirstW(hsp, &pe)) {
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| 98 | printf("Process32FirstW failed: %d\n", GetLastError());
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| 99 | CloseHandle(hsp);
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| 100 | return 1;
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| 101 | }
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| 102 |
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| 103 | dac = PROCESS_QUERY_INFORMATION | PROCESS_VM_READ | PROCESS_TERMINATE;
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| 104 | do {
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| 105 |
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| 106 | /*
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| 107 | * XXX TODO: if we really wanted to be fancy, we could check the
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| 108 | * modules for all processes (not just the python[_d].exe ones)
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| 109 | * and see if any of our DLLs are loaded (i.e. python30[_d].dll),
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| 110 | * as that would also inhibit our ability to rebuild the solution.
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| 111 | * Not worth loosing sleep over though; for now, a simple check
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| 112 | * for just the python executable should be sufficient.
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| 113 | */
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| 114 |
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| 115 | if (_wcsnicmp(pe.szExeFile, PYTHON_EXE, PYTHON_EXE_LEN))
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| 116 | /* This isn't a python process. */
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| 117 | continue;
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| 118 |
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| 119 | /* It's a python process, so figure out which directory it's in... */
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| 120 | hsm = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pe.th32ProcessID);
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| 121 | if (hsm == INVALID_HANDLE_VALUE)
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| 122 | /*
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| 123 | * If our module snapshot fails (which will happen if we don't own
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| 124 | * the process), just ignore it and continue. (It seems different
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| 125 | * versions of Windows return different values for GetLastError()
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| 126 | * in this situation; it's easier to just ignore it and move on vs.
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| 127 | * stopping the build for what could be a false positive.)
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| 128 | */
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| 129 | continue;
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| 130 |
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| 131 | if (!Module32FirstW(hsm, &me)) {
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| 132 | printf("Module32FirstW[2] failed: %d\n", GetLastError());
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| 133 | CloseHandle(hsp);
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| 134 | CloseHandle(hsm);
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| 135 | return 1;
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| 136 | }
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| 137 |
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| 138 | do {
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| 139 | if (_wcsnicmp(me.szModule, PYTHON_EXE, PYTHON_EXE_LEN))
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| 140 | /* Wrong module, we're looking for python[_d].exe... */
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| 141 | continue;
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| 142 |
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| 143 | if (_wcsnicmp(path, me.szExePath, len))
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| 144 | /* Process doesn't live in our directory. */
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| 145 | break;
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| 146 |
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| 147 | /* Python process residing in the right directory, kill it! */
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| 148 | hp = OpenProcess(dac, FALSE, pe.th32ProcessID);
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| 149 | if (!hp) {
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| 150 | printf("OpenProcess failed: %d\n", GetLastError());
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| 151 | CloseHandle(hsp);
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| 152 | CloseHandle(hsm);
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| 153 | return 1;
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| 154 | }
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| 155 |
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| 156 | if (!TerminateProcess(hp, 1)) {
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| 157 | printf("TerminateProcess failed: %d\n", GetLastError());
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| 158 | CloseHandle(hsp);
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| 159 | CloseHandle(hsm);
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| 160 | CloseHandle(hp);
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| 161 | return 1;
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| 162 | }
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| 163 |
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| 164 | CloseHandle(hp);
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| 165 | break;
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| 166 |
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| 167 | } while (Module32NextW(hsm, &me));
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| 168 |
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| 169 | CloseHandle(hsm);
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| 170 |
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| 171 | } while (Process32NextW(hsp, &pe));
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| 172 |
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| 173 | CloseHandle(hsp);
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| 174 |
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| 175 | return 0;
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| 176 | }
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| 177 |
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| 178 | /* vi: set ts=8 sw=4 sts=4 expandtab */
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