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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
/* A stub for Windows console processes (like nmake) that is able to terminate
* its child process via a generated Ctrl-C event.
* The termination is triggered by sending a custom message to the HWND of
* this process. */
#ifndef WINVER
#define WINVER 0x0501
#endif
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0501
#endif
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <shellapi.h>
#include <wchar.h>
#include <cstdlib>
#include <cstdio>
#ifdef QTCREATOR_PCH_H
#define CALLBACK WINAPI
#endif
/// Class that ensures that when the parent process cancels, the child
/// process will also be cancelled by the operating system.
///
/// This allows handling of GUI applications that do not react to Ctrl+C
/// or console applications that ignore Ctrl+C.
class JobKillOnClose
{
HANDLE m_job = nullptr;
public:
JobKillOnClose()
{
m_job = CreateJobObject(nullptr, nullptr);
if (!m_job) {
fwprintf(stderr, L"qtcreator_ctrlc_stub: CreateJobObject failed: 0x%x.\n", GetLastError());
return;
}
JOBOBJECT_EXTENDED_LIMIT_INFORMATION jeli = {0};
jeli.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE;
if (!SetInformationJobObject(m_job, JobObjectExtendedLimitInformation, &jeli, sizeof(jeli))) {
fwprintf(stderr, L"qtcreator_ctrlc_stub: SetInformationJobObject failed: 0x%x.\n", GetLastError());
}
}
BOOL AssignProcessToJob(HANDLE process) const
{
return AssignProcessToJobObject(m_job, process);
}
~JobKillOnClose()
{
CloseHandle(m_job);
}
};
const wchar_t szTitle[] = L"qtcctrlcstub";
const wchar_t szWindowClass[] = L"wcqtcctrlcstub";
const wchar_t szNice[] = L"-nice ";
UINT uiShutDownWindowMessage;
UINT uiInterruptMessage;
HWND hwndMain = nullptr;
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
BOOL WINAPI shutdownHandler(DWORD dwCtrlType);
BOOL WINAPI interruptHandler(DWORD dwCtrlType);
bool isSpaceOrTab(const wchar_t c);
bool startProcess(wchar_t pCommandLine[], bool lowerPriority, const JobKillOnClose& job);
int main(int argc, char **)
{
if (argc < 2) {
fprintf(stderr, "This is an internal helper of Qt Creator. Do not run it manually.\n");
return 1;
}
uiShutDownWindowMessage = RegisterWindowMessage(L"qtcctrlcstub_shutdown");
uiInterruptMessage = RegisterWindowMessage(L"qtcctrlcstub_interrupt");
WNDCLASSEX wcex = {0};
wcex.cbSize = sizeof(wcex);
wcex.lpfnWndProc = WndProc;
wcex.hInstance = GetModuleHandle(nullptr);
wcex.lpszClassName = szWindowClass;
if (!RegisterClassEx(&wcex))
return 1;
hwndMain = CreateWindow(szWindowClass, szTitle, WS_DISABLED,
0, 0, 0, 0, NULL, NULL, wcex.hInstance, NULL);
if (!hwndMain)
return FALSE;
// Get the command line and remove the call to this executable.
wchar_t *strCommandLine = _wcsdup(GetCommandLine());
const size_t strCommandLineLength = wcslen(strCommandLine);
size_t pos = 0;
bool quoted = false;
while (pos < strCommandLineLength) {
if (strCommandLine[pos] == L'"') {
quoted = !quoted;
} else if (!quoted && isSpaceOrTab(strCommandLine[pos])) {
while (isSpaceOrTab(strCommandLine[++pos]));
break;
}
++pos;
}
const size_t niceLen = wcslen(szNice);
bool lowerPriority = !wcsncmp(strCommandLine + pos, szNice, niceLen);
if (lowerPriority) {
pos += niceLen - 1; // reach the space, then the following line skips all spaces.
while (isSpaceOrTab(strCommandLine[++pos]))
;
}
JobKillOnClose job;
bool bSuccess = startProcess(strCommandLine + pos, lowerPriority, job);
free(strCommandLine);
if (!bSuccess)
return -1;
MSG msg;
DWORD dwExitCode = -1;
while (GetMessage(&msg, NULL, 0, 0))
{
if (msg.message == WM_DESTROY)
dwExitCode = static_cast<DWORD>(msg.wParam);
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return (int)dwExitCode;
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
if (message == uiShutDownWindowMessage) {
SetConsoleCtrlHandler(interruptHandler, FALSE);
PostQuitMessage(0);
return 0;
} else if (message == uiInterruptMessage) {
SetConsoleCtrlHandler(interruptHandler, TRUE);
GenerateConsoleCtrlEvent(CTRL_C_EVENT, 0);
return 0;
}
switch (message)
{
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
bool isSpaceOrTab(const wchar_t c)
{
return c == L' ' || c == L'\t';
}
BOOL WINAPI interruptHandler(DWORD /*dwCtrlType*/)
{
return TRUE;
}
DWORD WINAPI processWatcherThread(LPVOID lpParameter)
{
auto hProcess = reinterpret_cast<HANDLE>(lpParameter);
WaitForSingleObject(hProcess, INFINITE);
DWORD dwExitCode;
if (!GetExitCodeProcess(hProcess, &dwExitCode))
dwExitCode = -1;
CloseHandle(hProcess);
PostMessage(hwndMain, WM_DESTROY, dwExitCode, 0);
return 0;
}
bool startProcess(wchar_t *pCommandLine, bool lowerPriority, const JobKillOnClose& job)
{
SECURITY_ATTRIBUTES sa = {0};
sa.nLength = sizeof(sa);
sa.bInheritHandle = TRUE;
STARTUPINFO si = {0};
si.cb = sizeof(si);
PROCESS_INFORMATION pi;
DWORD dwCreationFlags = lowerPriority ? BELOW_NORMAL_PRIORITY_CLASS : 0;
BOOL bSuccess = CreateProcess(NULL, pCommandLine, &sa, &sa, TRUE, dwCreationFlags, NULL, NULL, &si, &pi);
if (!bSuccess) {
fwprintf(stderr, L"qtcreator_ctrlc_stub: Command line failed: %s\n", pCommandLine);
return false;
}
CloseHandle(pi.hThread);
if (!job.AssignProcessToJob(pi.hProcess)) {
fwprintf(stderr, L"qtcreator_ctrlc_stub: AssignProcessToJobObject failed: 0x%x.\n", GetLastError());
return false;
}
HANDLE hThread = CreateThread(NULL, 0, processWatcherThread, reinterpret_cast<void*>(pi.hProcess), 0, NULL);
if (!hThread) {
fwprintf(stderr, L"qtcreator_ctrlc_stub: The watch dog thread cannot be started.\n");
return false;
}
CloseHandle(hThread);
return true;
}
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