> -----Original Message-----
> From: Ramsay Jones
> Sent: Sunday, August 27, 2017 11:48 AM
> To: Adam Dinwoodie
> Cc: Jeff King; git@vger.kernel.org; Johannes Schindelin
> Subject: Re: cat-file timing window on Cygwin
>
>
>
> On 27/08/17 12:33, Adam Dinwoodie wrote:
> > On Sun, Aug 27, 2017 at 03:06:31AM +0100, Ramsay Jones wrote:
> >> On 26/08/17 22:11, Adam Dinwoodie wrote:
> >>> On Sat, Aug 26, 2017 at 11:53:37AM -0700, Jeff King wrote:
> >>>> Interesting. I find it a little hard to believe there's
> so obvious
> >>>> a bug as "fflush(NULL) flushes stdin", but well...that's
> what it seems like.
> >>>>
> >>>> If that's truly what it is, this is the minimal
> reproduction I came
> >>>> up
> >>>> with:
> >>>>
> >>>> -- >8 --
> >>>> #include <stdio.h>
> >>>>
> >>>> int main(void)
> >>>> {
> >>>> char buf[256];
> >>>> while (fgets(buf, sizeof(buf), stdin)) {
> >>>> fprintf(stdout, "got: %s", buf);
> >>>> fflush(NULL);
> >>>> }
> >>>> return 0;
> >>>> }
> >>>> -- 8< --
> >>>>
> >>>> If this really is the bug, then doing something like
> "seq 10 | ./a.out"
Tests good on latest snapshot. Fails on
Cygwin DLL version info:
DLL version: 2.8.2
DLL epoch: 19
DLL old termios: 5
DLL malloc env: 28
Cygwin conv: 181
API major: 0
API minor: 313
Shared data: 5
DLL identifier: cygwin1
Mount registry: 3
Cygwin registry name: Cygwin
Installations name: Installations
Cygdrive default prefix:
Build date:
Shared id: cygwin1S5
> >>>> would drop some of the input lines.
> >>>
> >>> ...yep. It does. Specifically, I consistently only get
> the firsts
> >>> line:
> >>>
> >>> $ seq 10 | ./a.exe
> >>> got: 1
> >>>
> >>> $
> >>>
> >>> If I introduce a delay between the lines of stdin (which
> I tested by
> >>> just typing stdin from the keyboard), it works as expected.
> >>>
> >>> Looks like this one will need to go to the Cygwin mailing
> list; I'll
> >>> take it there shortly. Thank you all for your help
> getting this far!
> >>
> >> This is apparently fixed in cygwin v2.8.3 [see commit 78ade082fe,
> >> ('Revert "errno: Stop using _impure_ptr->_errno completely"',
> >> 19-07-2017), commit 9cc89b0438 ("cygwin: Use errno instead of
> >> _impure_ptr->_errno", 19-07-2017), commit a674199fc9
> ("cygwin: Bump
> >> DLL version to 2.8.3",
> >> 19-07-2017) and commit d2ae2f00b8 ("cygwin: add fflush fix
> to release
> >> notes", 19-07-2017)].
> >>
> >> I haven't had a chance to try v2.8.3 yet (it's 3am and I'm
> about to
> >> go get some sleep).
> >
> > Cygwin 2.8.3 hasn't been released yet,
>
> Heh, yes, I found that out myself this afternoon. ;-)
>
> > but I've just tested the
> > latest development snapshot with Jeff's simple test case,
> and it works
> > as expected, so I'm going to assume the Git test will start passing
> > once that version of the Cygwin DLL is released too.
>
> Hmm, I'm not keen on installing "snapshot"(s), so I think I
> will wait for the release to test it. (However, as a matter
> of interest, how would I obtain/install/test this snapshot
> release - is it a 'low-risk' exercise?)
Using https://cygwin.com/snapshots/x86_64/cygwin-20170823.tar.xz
D:\inst\cygwin\cygwin-20170823>usr\bin\bash.exe
bash-4.4$ seq 10 | ./a.exe
got: 1
got: 2
got: 3
got: 4
got: 5
got: 6
got: 7
got: 8
got: 9
got: 10
bash-4.4$ cat cygcheck.out
Cygwin Configuration Diagnostics
Current System Time: Sun Aug 27 14:35:25 2017
Windows 10 Professional Ver 10.0 Build 14393
Cygwin DLL version info:
DLL version: 2.9.0
DLL epoch: 19
DLL old termios: 5
DLL malloc env: 28
Cygwin conv: 181
API major: 0
API minor: 317
Shared data: 5
DLL identifier: cygwin1
Mount registry: 3
Cygwin registry name: Cygwin
Installations name: Installations
Cygdrive default prefix:
Build date:
Snapshot date: 20170823-15:44:28
Shared id: cygwin1S5
bash-4.4$
v/r,
Jason Pyeron
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