Eryk Sun <eryk...@gmail.com> added the comment:
> The purpose of _Py_BEGIN_SUPPRESS_IPH is to suppress such popup, no?
That macro suppresses the CRT's invalid parameter handler, which by default
terminates abnormally with a fastfail (status code 0xC0000409), even in a
release build.
In a debug build, we still have message boxes from failed asserts that call
_CrtDbgReportW. For example, the following stack trace shows _CrtDbgReportW
called from _get_osfhandle:
Call Site
win32u!NtUserWaitMessage
user32!DialogBox2
user32!InternalDialogBox
user32!SoftModalMessageBox
user32!MessageBoxWorker
user32!MessageBoxTimeoutW
user32!MessageBoxW
ucrtbased!__acrt_MessageBoxW
ucrtbased!__crt_char_traits<wchar_t>::message_box<HWND__ * __ptr64,
wchar_t const * __ptr64 const & __ptr64,
wchar_t const * __ptr64 const & __ptr64,
unsigned int const & __ptr64>
ucrtbased!common_show_message_box<wchar_t>
ucrtbased!__acrt_show_wide_message_box
ucrtbased!common_message_window<wchar_t>
ucrtbased!__acrt_MessageWindowW
ucrtbased!_VCrtDbgReportW
ucrtbased!_CrtDbgReportW
ucrtbased!_get_osfhandle
python310_d!PyOS_StdioReadline
_get_osfhandle validates that the fd is open via
_VALIDATE_CLEAR_OSSERR_RETURN(_osfile(fh) & FOPEN, EBADF, -1);
which uses the following macro:
#define _VALIDATE_CLEAR_OSSERR_RETURN(expr, errorcode, retexpr)
\
{
\
int _Expr_val=!!(expr);
\
_ASSERT_EXPR((_Expr_val), _CRT_WIDE(#expr));
\
if (!(_Expr_val))
\
{
\
_doserrno = 0L;
\
errno = errorcode;
\
_INVALID_PARAMETER(_CRT_WIDE(#expr));
\
return retexpr;
\
}
\
}
In a debug build, _ASSERT_EXPR expands as:
#define _ASSERT_EXPR(expr, msg) \
(void)(
\
(!!(expr)) ||
\
(1 != _CrtDbgReportW(_CRT_ASSERT, _CRT_WIDE(__FILE__), __LINE__,
NULL, L"%ls", msg)) || \
(_CrtDbgBreak(), 0)
\
)
which is where _CrtDbgReportW gets called. By default it reports the assertion
failure with a message box. The suppression of this in libregrtest either
ignores this report or sends it to stderr:
for m in [msvcrt.CRT_WARN, msvcrt.CRT_ERROR, msvcrt.CRT_ASSERT]:
if verbose:
msvcrt.CrtSetReportMode(m, msvcrt.CRTDBG_MODE_FILE)
msvcrt.CrtSetReportFile(m, msvcrt.CRTDBG_FILE_STDERR)
else:
msvcrt.CrtSetReportMode(m, 0)
msvcrt.CrtSetReportMode and msvcrt.CrtSetReportFile only exist in a debug build.
----------
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<https://bugs.python.org/issue40826>
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