CreatePipe에서 자식프로세스로 핸들을 상속받을 수 있도록 했다면 자식에서도 모두 파이프를 닫아줘야 할까요?

-send.cpp-
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdline, int nShowCmd) {
        HWND hwnd=CreateWindow(~);
        ShowWindow(hwnd, nShowCmd);
	SendMessage(hwnd, WM_APP, 0, 0);
        //이하 메시지 루프
}
 
HANDLE writeHandle, readHandle;
LRESULT CALLBACK WinProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
	switch(message) {
		case WM_CREATE:
 
			return 0;
		case WM_APP:
			{
				SECURITY_ATTRIBUTES sec;
				sec.nLength=sizeof(sec);
				sec.lpSecurityDescriptor=NULL;
				sec.bInheritHandle=TRUE;
				BOOL bPipe=CreatePipe(&readHandle, &writeHandle, &sec, 0);
				if(!bPipe) MessageBox(hwnd, TEXT("CreatePipe's returned 0."), TEXT("error"), MB_OK);
 
				HDC hdc=GetDC(hwnd);
				TCHAR handlebuffer[1024];
 
				//_stprintf(handlebuffer, TEXT("readHandle is %u"), readHandle);
				//TextOut(hdc, 10, 70, handlebuffer, _tcslen(handlebuffer));
 
				STARTUPINFO si;
				memset(&si, 0, sizeof(si));
				si.cb=sizeof(si);
				PROCESS_INFORMATION pi;
				memset(&pi, 0, sizeof(pi));
 
				TCHAR command[1024];
				memset(command, 0, sizeof(command));
				_stprintf(command, TEXT("recv %u %u"), readHandle, writeHandle);
 
				if(!CreateProcess(NULL, command, NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi)) {
					MessageBox(hwnd, TEXT("CreateProcess's returned 0."), TEXT("error"), MB_OK);
				}
 
				TCHAR wbuffer[1024];
				memset(wbuffer, 0, sizeof(wbuffer));
				_stprintf(wbuffer, TEXT("%s"), TEXT("testing..."));
				DWORD bytes;
				while(!WriteFile(writeHandle, wbuffer, (_tcslen(wbuffer)+1)*sizeof(TCHAR), &bytes, NULL)) {
					//WriteFile(writeHandle, wbuffer, (_tcslen(wbuffer)+1)*sizeof(TCHAR), &bytes, NULL);
					//if(bytes>0) break;
					//MessageBox(hwnd, TEXT("CreateProcess's returned 0."), TEXT("error"), MB_OK);
				}
				TextOut(hdc, 10, 90, command, _tcslen(command));
				ReleaseDC(hwnd, hdc);
				CloseHandle(readHandle);
				CloseHandle(writeHandle);
 
 
			}
			return 0;
		case WM_DESTROY:
			PostQuitMessage(0);
			return 0;
	}
 
	return DefWindowProc(hwnd, message, wparam, lparam);
}
-recv.cpp-
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdline, int nShowCmd) {
	HWND hwnd=CreateWindow(~);
	ShowWindow(hwnd, nShowCmd);
        //메시지 루프
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
	switch(message) {
		case WM_CREATE:
 
			return 0;
		case WM_APP:
			{
				TCHAR* cmdline=GetCommandLine();
				TCHAR* handle_add=_tcschr(cmdline, TEXT(' '));
				++handle_add;
				HANDLE readHandle;
				#ifdef UNICODE
					readHandle=(HANDLE)_wtoi(handle_add);
				#else
					readHandle=(HANDLE)atoi(handle_add);
				#endif
 
 
				handle_add=_tcschr(handle_add, TEXT(' '));
				++handle_add;
				HANDLE writeHandle;
				#ifdef UNICODE
					writeHandle=(HANDLE)_wtoi(handle_add);
				#else
					writeHandle=(HANDLE)atoi(handle_add);
				#endif
 
 
				TCHAR rbuffer[1024];
				memset(rbuffer, 0, sizeof(rbuffer));
				DWORD bytes;
				while(!ReadFile(readHandle, rbuffer, sizeof(rbuffer), &bytes, NULL)) { }
				HDC hdc=GetDC(hwnd);
				TextOut(hdc, 10, 10, cmdline, _tcslen(cmdline));
				TextOut(hdc, 10, 30, rbuffer, _tcslen(rbuffer));
				ReleaseDC(hwnd, hdc);
				CloseHandle(readHandle);//1)
				CloseHandle(writeHandle);//2)
			}
			return 0;
		case WM_DESTROY:
			PostQuitMessage(0);
			return 0;
	}
	return DefWindowProc(hwnd, message, wparam, lparam);
}