I have a Win32 C++ application. I'm trying to launch one or several child processes with CreateProcess. I want the children to close when the parent does.
I achieved this by creating a job and enabling JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE:
HANDLE hJob = CreateJobObject(NULL, NULL);
JOBOBJECT_EXTENDED_LIMIT_INFORMATION extendedInfo;
ZeroMemory(&extendedInfo, sizeof(extendedInfo));
extendedInfo.BasicLimitInformation.LimitFlags =
JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE;
SetInformationJobObject(
hJob, JOBOBJECTINFOCLASS::JobObjectExtendedLimitInformation,
&extendedInfo, sizeof(extendedInfo));
Then adding the current (parent) and created (child) process to this job:
// assign parent to job
AssignProcessToJobObject(hJob, GetCurrentProcess());
// launch child with no inherited handles
PROCESS_INFORMATION procInfo;
ZeroMemory(&procInfo, sizeof(procInfo));
STARTUPINFOA startInfo;
ZeroMemory(&startInfo, sizeof(startInfo));
startInfo.cb = sizeof(startInfo);
startInfo.dwFlags |= STARTF_USESTDHANDLES;
bool success = CreateProcessA(NULL,
"test.exe", // command line
NULL, // process security attributes
NULL, // primary thread security attributes
FALSE, // handles are inherited
0, // creation flags
NULL, // use parent's environment
NULL, // use parent's current directory
&startInfo, // STARTUPINFO pointer
&procInfo); // receives PROCESS_INFORMATION
// assign child to job
AssignProcessToJobObject(hJob, procInfo.hProcess);
This works, but the parent app and the child app (main.exe and test.exe) show up as two unrelated processes in the task manager:
(Even though closing main.exe will close test.exe).
What am I doing differently than, say, Microsoft Teams or Chrome, which both have nested processes?
