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Date: Sat, 16 Feb 2019 10:38:55 +0100
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: textmode for stdout, what is "correct" now?
Message-ID: <20190216093855.GR2702@calimero.vinschen.de>
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References: <739ed5ce-6902-d702-e152-65dc2c1da667@ssi-schaefer.com> <20190214162002.GA4950@calimero.vinschen.de> <6aa280c2-4769-0772-91d9-c73a3a3d9680@ssi-schaefer.com> <20190215102251.GA2702@calimero.vinschen.de> <f7345109-5b22-a342-df1e-940e236c2397@ssi-schaefer.com> <20190215124844.GE2702@calimero.vinschen.de> <6d02258d-115d-135c-1404-1b02eec34045@ssi-schaefer.com> <20190215203108.GN2702@calimero.vinschen.de> <f1372893-842b-93e1-f0f2-3a9f3ac02e20@ssi-schaefer.com>
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On Feb 16 09:19, Michael Haubenwallner wrote:
> On 2/15/19 9:31 PM, Corinna Vinschen wrote:
> > On Feb 15 19:07, Michael Haubenwallner wrote:
> >> On 2/15/19 1:48 PM, Corinna Vinschen wrote:
> >>> On Feb 15 13:03, Michael Haubenwallner wrote:
> >>>> On 2/15/19 11:22 AM, Corinna Vinschen wrote:
> >>>>> On Feb 15 08:56, Michael Haubenwallner wrote:
> >>>>>> On 2/14/19 5:20 PM, Corinna Vinschen wrote:
> >>>>>>> On Feb 14 16:23, Michael Haubenwallner wrote:
> >>>>>>>> Hi,
> >>>>>>>> [SNIP]
> >>>>>> Down the line in their BIO module they do use setmode(fd, O_TEXT),
> >>>>>> which is the one that does introduce the \r, as far as I know.
> >>>>>
> >>>>> This one is not so nice.  Somebody should tell upstream we only
> >>>>> want explicit O_BINARY these days, but no explicit O_TEXT.
> >>
> >> To me it sounds strange to use the one but not the other:
> >>
> >> If we don't want O_TEXT at all, isn't O_BINARY obsolete as well,
> >> so the advise should be to use neither - just like real *nix?
> >=20
> > No, on text mode mounts O_BINARY makes sure that the result is
> > actually a binary file.
> >=20
> >> A consequence then might be to deprecate (or even remove) them
> >> from the public API header files.
> >=20
> > As long as we have text mode mounts, no.
>=20
> Ah... So this feels like a semantic confusion around setmode(O_TEXT):
>=20
> For the fopen() API family, POSIX says that conforming platforms should
> accept (and eventually ignore) the 'b' character in the mode argument.
> But note that there is no 't' character specified here.
>=20
> So with the fopen() API family, application developers are able to
> enable or disable binary mode, but are _not_ able to explicitly
> enable or disable text mode.
>=20
> Unfortunately, the setmode() API is semantically different, because it
> does not allow to disable binary mode, but to "enable text mode" instead.
>=20
> So with the setmode() API, when application developers want to disable
> binary mode, their only option is to "enable text mode".

setmode(fd, O_BINARY) works on Cygwin.


Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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