X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:from:to:subject:message-id:reply-to
	:references:mime-version:content-type:in-reply-to; q=dns; s=
	default; b=huGDjMfDXSKkxYV7k8PBkZHSmMbkYD/6ELdhipssyfZlBBYDy/mHn
	kpuC5rMhkqe3WL0hiU8KGoLcMtXuTGXgRsbZ7VeDQQq+E4OIKSPszCCVchot8KRF
	RyKdXX9aLNPclCyAxH7Km7b4nDE9kXcZgB0lN4vJ5XvDZYbojN56Kg=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:date:from:to:subject:message-id:reply-to
	:references:mime-version:content-type:in-reply-to; s=default;
	bh=K7PNFNixZyfhq+2m42zxgNNH4cs=; b=tQF8bg1ULxe7Bbjput057G0KqFs/
	y9G1WyByuJ3nQT7UpStMnqPhAE25LVj+hW56ZIIZ4r+FeXzzuXAWDaFgjcANzpK7
	am7Rr8ovrKblQ40K1+NQMRLj/XwZGsv2mcEjrzBymrwCeOfq9YVW3ch03IzmwIIr
	Lb2CDjOP7HfIl/4=
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
Authentication-Results:	sourceware.org; auth=none
X-Spam-SWARE-Status:	No, score=-106.4 required=5.0 tests=AWL,BAYES_00,GOOD_FROM_CORINNA_CYGWIN,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 spammy=HX-Languages-Length:2042, solved, H*F:D*cygwin.com
X-HELO:	mout.kundenserver.de
Date:	Mon, 2 Mar 2020 17:07:42 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Incorrect behavior in TIOCINQ ioctl
Message-ID:	<20200302160742.GR4045@calimero.vinschen.de>
Reply-To:	cygwin AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
References:	<d6a35f8b-3e4d-c8c6-4d3c-f15ccd72866d AT gmail DOT com> <20200228192330 DOT GN4045 AT calimero DOT vinschen DOT de> <09e4b16c-a4fb-4062-1d29-a92a916f186b AT gmail DOT com>
MIME-Version:	1.0
In-Reply-To:	<09e4b16c-a4fb-4062-1d29-a92a916f186b@gmail.com>

--1y/7ip9Z0l6NTTti
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Feb 29 11:37, =C3=85ke Rehnman wrote:
>=20
> On 2020-02-28 20:23, Corinna Vinschen wrote:
>=20
> > - Is it a safe bet that ClearCommError returns valid values in
> >    st.cbInQue even if one of the error conditions occur?  Maybe the
> >    right thing to do is to return 0 in certain error cases...?
>=20
> The win32 api=C2=A0 documentation does not mention anything about not ret=
urning
> proper device status as long as the function succeeds...
>=20
> Anyhow in my pursuit for the truth I whipped up a small test program and
> strace:d it (with some extra debug printout in fhandler_serial::ioctl)
>=20
> =C2=A0127 2403456 [main] python2.7 1662 fhandler_serial::ioctl: 0 =3D ioc=
tl(541B,
> 0xFFFFBCB0) ev=3DC st.cbInQue=3D7
> =C2=A0 216 3406481 [main] python2.7 1662 fhandler_serial::ioctl: 0 =3D io=
ctl(541B,
> 0xFFFFBCB0) ev=3DC st.cbInQue=3DE
> =C2=A0=C2=A0 90 4409676 [main] python2.7 1662 fhandler_serial::ioctl: 0 =
=3D ioctl(541B,
> 0xFFFFBCB0) ev=3DC st.cbInQue=3D15
> =C2=A0 141 5413027 [main] python2.7 1662 fhandler_serial::ioctl: 0 =3D io=
ctl(541B,
> 0xFFFFBCB0) ev=3DC st.cbInQue=3D1C
> =C2=A0 129 6416204 [main] python2.7 1662 fhandler_serial::ioctl: 0 =3D io=
ctl(541B,
> 0xFFFFBCB0) ev=3DC st.cbInQue=3D23
> =C2=A0 121 7419254 [main] python2.7 1662 fhandler_serial::ioctl: 0 =3D io=
ctl(541B,
> 0xFFFFBCB0) ev=3DC st.cbInQue=3D2A
> =C2=A0 203 8423829 [main] python2.7 1662 fhandler_serial::ioctl: 0 =3D io=
ctl(541B,
> 0xFFFFBCB0) ev=3DC st.cbInQue=3D31
> =C2=A0=C2=A0 89 9427183 [main] python2.7 1662 fhandler_serial::ioctl: 0 =
=3D ioctl(541B,
> 0xFFFFBCB0) ev=3DC st.cbInQue=3D38
> =C2=A0 131 10431271 [main] python2.7 1662 fhandler_serial::ioctl: 0 =3D i=
octl(541B,
> 0xFFFFBCB0) ev=3DC st.cbInQue=3D3F
> =C2=A0 118 11435254 [main] python2.7 1662 fhandler_serial::ioctl: 0 =3D i=
octl(541B,
> 0xFFFFBCB0) ev=3DC st.cbInQue=3D46
>=20
> >=20
> > - Did you actually try if this fixes your problem?  It's pretty
> >    simple to build the Cygwin DLL
> >    https://cygwin.com/faq.html#faq.programming.building-cygwin
>=20
> I patched it yesterday and it solved the problem...
>=20
> /Ake

I pushed a patch.


Thanks,
Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

--1y/7ip9Z0l6NTTti
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----
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=Sdtg
-----END PGP SIGNATURE-----

--1y/7ip9Z0l6NTTti--

- Raw text -