diff options
Diffstat (limited to 'PCbuild/kill_python.c')
| -rw-r--r-- | PCbuild/kill_python.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/PCbuild/kill_python.c b/PCbuild/kill_python.c new file mode 100644 index 0000000..8ee22e8 --- /dev/null +++ b/PCbuild/kill_python.c @@ -0,0 +1,178 @@ +/*
+ * 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 */
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