mirror of
https://github.com/python/cpython.git
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179 lines
5.5 KiB
C
179 lines
5.5 KiB
C
/*
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* Helper program for killing lingering python[_d].exe processes before
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* building, thus attempting to avoid build failures due to files being
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* locked.
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*/
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#include <windows.h>
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#include <wchar.h>
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#include <tlhelp32.h>
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#include <stdio.h>
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#pragma comment(lib, "psapi")
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#ifdef _DEBUG
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#define PYTHON_EXE (L"python_d.exe")
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#define PYTHON_EXE_LEN (12)
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#define KILL_PYTHON_EXE (L"kill_python_d.exe")
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#define KILL_PYTHON_EXE_LEN (17)
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#else
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#define PYTHON_EXE (L"python.exe")
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#define PYTHON_EXE_LEN (10)
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#define KILL_PYTHON_EXE (L"kill_python.exe")
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#define KILL_PYTHON_EXE_LEN (15)
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#endif
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int
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main(int argc, char **argv)
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{
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HANDLE hp, hsp, hsm; /* process, snapshot processes, snapshot modules */
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DWORD dac, our_pid;
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size_t len;
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wchar_t path[MAX_PATH+1];
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MODULEENTRY32W me;
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PROCESSENTRY32W pe;
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me.dwSize = sizeof(MODULEENTRY32W);
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pe.dwSize = sizeof(PROCESSENTRY32W);
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memset(path, 0, MAX_PATH+1);
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our_pid = GetCurrentProcessId();
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hsm = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, our_pid);
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if (hsm == INVALID_HANDLE_VALUE) {
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printf("CreateToolhelp32Snapshot[1] failed: %d\n", GetLastError());
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return 1;
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}
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if (!Module32FirstW(hsm, &me)) {
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printf("Module32FirstW[1] failed: %d\n", GetLastError());
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CloseHandle(hsm);
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return 1;
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}
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/*
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* Enumerate over the modules for the current process in order to find
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* kill_process[_d].exe, then take a note of the directory it lives in.
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*/
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do {
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if (_wcsnicmp(me.szModule, KILL_PYTHON_EXE, KILL_PYTHON_EXE_LEN))
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continue;
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len = wcsnlen_s(me.szExePath, MAX_PATH) - KILL_PYTHON_EXE_LEN;
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wcsncpy_s(path, MAX_PATH+1, me.szExePath, len);
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break;
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} while (Module32NextW(hsm, &me));
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CloseHandle(hsm);
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if (path == NULL) {
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printf("failed to discern directory of running process\n");
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return 1;
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}
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/*
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* Take a snapshot of system processes. Enumerate over the snapshot,
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* looking for python processes. When we find one, verify it lives
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* in the same directory we live in. If it does, kill it. If we're
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* unable to kill it, treat this as a fatal error and return 1.
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*
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* The rationale behind this is that we're called at the start of the
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* build process on the basis that we'll take care of killing any
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* running instances, such that the build won't encounter permission
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* denied errors during linking. If we can't kill one of the processes,
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* we can't provide this assurance, and the build shouldn't start.
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*/
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hsp = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
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if (hsp == INVALID_HANDLE_VALUE) {
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printf("CreateToolhelp32Snapshot[2] failed: %d\n", GetLastError());
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return 1;
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}
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if (!Process32FirstW(hsp, &pe)) {
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printf("Process32FirstW failed: %d\n", GetLastError());
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CloseHandle(hsp);
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return 1;
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}
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dac = PROCESS_QUERY_INFORMATION | PROCESS_VM_READ | PROCESS_TERMINATE;
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do {
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/*
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* XXX TODO: if we really wanted to be fancy, we could check the
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* modules for all processes (not just the python[_d].exe ones)
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* and see if any of our DLLs are loaded (i.e. python32[_d].dll),
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* as that would also inhibit our ability to rebuild the solution.
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* Not worth loosing sleep over though; for now, a simple check
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* for just the python executable should be sufficient.
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*/
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if (_wcsnicmp(pe.szExeFile, PYTHON_EXE, PYTHON_EXE_LEN))
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/* This isn't a python process. */
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continue;
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/* It's a python process, so figure out which directory it's in... */
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hsm = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pe.th32ProcessID);
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if (hsm == INVALID_HANDLE_VALUE)
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/*
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* If our module snapshot fails (which will happen if we don't own
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* the process), just ignore it and continue. (It seems different
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* versions of Windows return different values for GetLastError()
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* in this situation; it's easier to just ignore it and move on vs.
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* stopping the build for what could be a false positive.)
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*/
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continue;
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if (!Module32FirstW(hsm, &me)) {
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printf("Module32FirstW[2] failed: %d\n", GetLastError());
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CloseHandle(hsp);
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CloseHandle(hsm);
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return 1;
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}
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do {
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if (_wcsnicmp(me.szModule, PYTHON_EXE, PYTHON_EXE_LEN))
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/* Wrong module, we're looking for python[_d].exe... */
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continue;
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if (_wcsnicmp(path, me.szExePath, len))
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/* Process doesn't live in our directory. */
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break;
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/* Python process residing in the right directory, kill it! */
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hp = OpenProcess(dac, FALSE, pe.th32ProcessID);
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if (!hp) {
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printf("OpenProcess failed: %d\n", GetLastError());
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CloseHandle(hsp);
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CloseHandle(hsm);
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return 1;
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}
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if (!TerminateProcess(hp, 1)) {
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printf("TerminateProcess failed: %d\n", GetLastError());
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CloseHandle(hsp);
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CloseHandle(hsm);
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CloseHandle(hp);
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return 1;
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}
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CloseHandle(hp);
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break;
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} while (Module32NextW(hsm, &me));
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CloseHandle(hsm);
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} while (Process32NextW(hsp, &pe));
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CloseHandle(hsp);
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return 0;
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}
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/* vi: set ts=8 sw=4 sts=4 expandtab */
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