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process_ctrlc_stub: Close child process when parent closes

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When using gui applications the closing of process_ctrlc_sub launcher
application didn't have any effect on the child process.

By using a job object with JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE the
child process gets cancelled when parent process closes.

Fixes: QTCREATORBUG-26687
Change-Id: Id13b4d6f876589a018fa8f6841304417b87ee653
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>
This commit is contained in:
Cristian Adam
2021-12-07 16:46:51 +01:00
parent 922cce1634
commit 537ba23fff
1 changed files with 44 additions and 3 deletions
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47
src/libs/utils/process_ctrlc_stub.cpp
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@@ -50,6 +50,40 @@
#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 ";
@@ -61,7 +95,7 @@ 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);
bool startProcess(wchar_t pCommandLine[], bool lowerPriority, const JobKillOnClose& job);
int main(int argc, char **)
{
@@ -108,7 +142,9 @@ int main(int argc, char **)
while (isSpaceOrTab(strCommandLine[++pos]))
;
}
bool bSuccess = startProcess(strCommandLine + pos, lowerPriority);
JobKillOnClose job;
bool bSuccess = startProcess(strCommandLine + pos, lowerPriority, job);
free(strCommandLine);
if (!bSuccess)
@@ -181,7 +217,7 @@ DWORD WINAPI processWatcherThread(LPVOID lpParameter)
return 0;
}
bool startProcess(wchar_t *pCommandLine, bool lowerPriority)
bool startProcess(wchar_t *pCommandLine, bool lowerPriority, const JobKillOnClose& job)
{
SECURITY_ATTRIBUTES sa = {0};
sa.nLength = sizeof(sa);
@@ -199,6 +235,11 @@ bool startProcess(wchar_t *pCommandLine, bool lowerPriority)
}
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");