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/*
* 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. python34[_d].dll),
* as that would also inhibit our ability to rebuild the solution.
* Not worth losing 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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