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Date: Fri, 17 Jan 2014 10:28:37 +0100
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: fork() + file descriptor bug in 1.7.27(0.271/5/3) 2013-12-09 11:54
Message-ID: <20140117092837.GI2831@calimero.vinschen.de>
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References: <831845.98759.bm@smtp116.sbc.mail.ne1.yahoo.com> <52D55D96.8070407@redhat.com> <946338.89157.bm@smtp116.sbc.mail.ne1.yahoo.com> <CAG9p0OR8JYgC1rzBCn1bvXe5ffpJS3vpmnnxw-7brJi8E8+uhQ@mail.gmail.com> <52D63CE2.9060308@lysator.liu.se> <858084.71265.bm@smtp116.sbc.mail.ne1.yahoo.com> <20140115163354.GA30234@calimero.vinschen.de> <670957.90887.bm@smtp117.sbc.mail.ne1.yahoo.com> <20140116085026.GA26205@calimero.vinschen.de> <491859.27055.bm@smtp113.sbc.mail.ne1.yahoo.com>
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On Jan 16 23:53, tednolan@bellsouth.net wrote:
> In message <20140116085026.GA26205@calimero.vinschen.de>you write:
> >
> >Can you change your testcase another bit, please?  Enable your
> >`ftell' printf, but rather than printing the result of ftell,
> >print the result of lseek:
> >
> >  fprintf(stderr, "(%s) (%s) %d %ld\n", infile,
> >        outfile, i, lseek(fileno(fp), 0, SEEK_CUR));
> >
> >I would be curious what happens on Solaris here.
> >
>=20
> OK,
>=20
> I took the original test case and made your lseek change.  Here are
> the Solaris & FreeBSD results.
>=20
> Here is Solaris 9:
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3DSOLARIS=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> Script started on Thu Jan 16 23:47:20 2014
> solabel10% ./a.out < test_data
> (00.tif) (00.eps) 1 45
> Running 0
> child
> (01.tif) (01.eps) 2 15
> Running 1
> child
> (02.tif) (02.eps) 3 0
> Running 2

Thanks!  That's exactly what happens on Cygwin as well.

I'm about to check in code to newlib which allows to choose between
Solaris/POSIX semantics to BSD/Linux semantics(*) at build time.  Since
Linux is our role model, we're going to switch to BSD/Linux semantics
for the next Cygwin release as well.


Thanks,
Corinna

(*) More precise: BSD/Glibc semantics.

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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