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Date:	Thu, 19 Dec 2019 10:24:09 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: MC no longer working with cygwin 3.1.x
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On Dec 18 23:09, Ken Brown wrote:
> On 12/18/2019 5:55 PM, Thomas Wolff wrote:
> > Am 18.12.2019 um 22:14 schrieb Ken Brown:
> >> On 12/18/2019 2:32 PM, Corinna Vinschen wrote:
> >>> On Dec 18 17:23, Marco Atzeri wrote:
> >>>> Am 18.12.2019 um 15:42 schrieb Laurent R:
> >>>>> Dear all,
> >>>>>
> >>>>> After the update to cygwin-3.1.1, mc (aka Midnight Commander) no lo=
nger=20
> >>>>> starts. It goes into an infinite loop, if I go back to cygwin-3.0.7=
, mc=20
> >>>>> works perfectly.
> >>>>>
> >>>>> I tested with cygwin-3.1.0, same problem.
> >>>>>
> >>>>> The MC version is 4.8.23 and the operating system is Windows 10 Pro=
 x64 1903.
> >>>> confirmed
> >>>>
> >>>> there must be a race somewhere as running /usr/bin/mc.exe from strace
> >>>> works fine.
> >>> But that's not the only problem running mc AFAICS.=C2=A0 I'm seeing an
> >>> error message in the background:
> >>>
> >>> Cannot open named pipe /tmp/mc-corinna/mc.pipe.384
> >>>=20=20=20=20=20
> >>> /cygdrive/d/cyg_pub/devel/mc/mc-4.8.23-1.x86_64/src/mc-4.8.23/src/sub=
shell/common.c:=20
> >>> open: Permission denied
> >>> [...]
> >> I've just looked at the mc source code, and it seems that (under tcsh =
only), mc
> >> creates a fifo and tries to open it twice as O_RDWR.=C2=A0 This is not=
 supported on
> >> Cygwin, so the second attempt fails.
> >>
> >> Here's the relevant code from src/subshell/common.c:
> >> [...]
> >> Under bash, zsh, and some other shells, mc uses ordinary pipes rather =
than
> >> FIFOs.=C2=A0 I have no idea why tcsh is treated differently.
> >>
> >> Until someone[*] gets around to making it possible to open a FIFO twic=
e for
> >> reading, I don't think there's anything we can do about it.=C2=A0 I al=
so don't know
> >> how important this is for mc.=C2=A0 I don't use tcsh or mc, so I can't=
 judge.

Not using mc either here.  I see the STATUS_ACCESS_DENIED in the strace
output when calling NtCreateNamedPipeFile, but I wonder why that is.

Ken, btw., we should add a PIPE_REJECT_REMOTE_CLIENTS flag, just for
paranoia.

> > I've reproduced mc to fail, from bash, in cygwin 3.1.0 and 3.1.1, Windo=
ws 1809=20
> > and 1903.
>=20
> That's not related to what I've been talking about, which is the error
> message "Cannot open named pipe /tmp/mc-corinna/mc.pipe.384" that
> Corinna reported.  The failure you're talking about occurs in all
> shells and has already been fixed by Takashi.  I imagine Corinna will
> release 3.1.2 with the fix very soon.

Yes, today or tomorrow.  Maybe some other low-hanging fruit roles past...


Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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