Destructor not being called upon program exit - c++

Question

I'm writing a very simple debugger and I defined a class called BREAKPOINT_INFO that contains information about breakpoints set.
class BREAKPOINT_INFO
{
public:
HANDLE hProcess;
PCHAR lpBreakPoint;
CHAR instr;
BOOL justCalled;
//Set default values
BREAKPOINT_INFO()
{
hProcess = NULL;
lpBreakPoint = NULL;
instr = 0x00;
justCalled = FALSE;
}
//Destructor
~BREAKPOINT_INFO()
{
//Let me know the destructor is being called
MessageBox(NULL, "Destructor called", NULL, MB_OK);
DWORD dwError = 0;
LPCSTR szErrorRest = (LPCSTR)"Error restoring original instruction: ";
LPCSTR szErrorHanlde = (LPCSTR)"Error closing process handle: ";
std::ostringstream oss;
if(hProcess != NULL && lpBreakPoint != NULL)
{
//write back the original instruction stored in instr
if(!WriteProcessMemory(hProcess, lpBreakPoint, &instr, sizeof(CHAR), NULL))
{
dwError = GetLastError();
oss << szErrorRest << dwError;
MessageBox(NULL, oss.str().c_str(), "ERROR", MB_OK|MB_ICONERROR);
}
}
}
};
I need the destructor to clean up any breakpoints set however the deconstructor is never called and I'm not quite sure why that is in my particular case.
Here's main.cpp:
BREAKPOINT_INFO instrMov;
//GetProcModuleHandle is a function I made to get the handle of a
//of a module in a remote process
LPVOID lpServerDll = (LPVOID)GetProcModuleHandle(dwPid, szServerDll);
//the instructions address is relative to the starting address of the server dll. Hence the offset.
PCHAR lpInstr = (PCHAR)((DWORD)lpServerDll+instr_offset);
hProcess = OpenProcess(PROCESS_ALL_ACCESS, TRUE, dwPid);
//sets the breakpoint
instrMov.InitializeBreakPoint(hProcess, lpInstr);
while(1)
{
if(!instrMov.justCalled)
{
instrMov.SetBreakPoint();
}
if(instrMov.justCalled)
{
instrMov.justCalled = FALSE;
}
if(WaitForDebugEvent(&dbgEvent, 0))
{
ProcessDebugEvent(&dbgEvent, lpBreakPoints, 3);
ContinueDebugEvent(dbgEvent.dwProcessId, dbgEvent.dwThreadId, DBG_CONTINUE);
}
}
return 0; //<---never reaches return
It's a never ending loop so the program, at the moment, never actually reaches the return. It has to be terminated with either Ctrl+C or by closing the terminal. Not sure if this could be causing the destructor to not be called or not.
Any information, solutions, etc would be greatly appreciated. Thank you for your time.

Answer 1

you have to handle SIGINT signal, otherwise program is terminated abnormally and dtors are not called.