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=ZI05PVCOlGZiHAuGkWJ2VbVNA1ZXu9eVS05MlU7A6/ro6jxILQAjK
	KBRYxHP1Xl4Ep19rwQwI+mvvF5iTA05qrFLgrzzp4n+5JEMSvnSL5SsBoLmv8xY5
	+I/9VwyqyccoFnjk9NaQx6hXcGgaoOBDAuCELr3pgi1cgA3vYmCNuU=
Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm
Sender: cygwin-owner@cygwin.com
Mail-Followup-To: cygwin@cygwin.com
Date: Fri, 19 Jul 2013 12:08:09 +0200
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: sqlite defect
Message-ID: <20130719100809.GD20871@calimero.vinschen.de>
Reply-To: cygwin@cygwin.com
Mail-Followup-To: cygwin@cygwin.com
References: <trinity-fdc5a0b5-6dcf-4fc0-9370-dd32a75fe928-1373654994500@3capp-gmx-bs47> <51E703FB.1010300@etr-usa.com> <trinity-1068d666-3dec-43c9-8453-39c7cae3a94c-1374102947415@3capp-gmx-bs33> <51E74AB4.7010508@etr-usa.com> <ks87ur$nle$1@ger.gmane.org> <20130718085953.GC9628@calimero.vinschen.de> <ksa6bs$ac9$1@ger.gmane.org> <20130719100329.GC20871@calimero.vinschen.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <20130719100329.GC20871@calimero.vinschen.de>
User-Agent: Mutt/1.5.21 (2010-09-15)

On Jul 19 12:03, Corinna Vinschen wrote:
> On Jul 19 10:56, jojelino wrote:
> > On 2013-07-18 PM 5:59, Corinna Vinschen wrote:> On Jul 18 17:11,
> > jojelino wrote:
> > >> On 2013-07-18 AM 10:53, Warren Young wrote:
> > >>> Nothing so simple.  Locking is handled at the OS and/or Cygwin DLL
> > >>> level.  The build change between 3.7.16.2 and 3.7.17-3 is that
> > we're now
> > >>> relying on new features in the Cygwin DLL to do Windows-style
> > locking by
> > >>> default.
> > >>>
> > >>> Older versions of Cygwin SQLite bypassed the Cygwin DLL entirely for
> > >>> this, going straight to the Win32 API, thereby preventing the DLL from
> > >>> interposing itself for the "posix" case.
> > >>>
> > >> Mandatory locking feature of cygwin used in sqlite is broken.
> > >
> > > Simple testcase in plain C?
> 
> Thanks, but...
> 
> > #include <stdio.h>
> > #include <fcntl.h>
> > #include <assert.h>
> > #include <string.h>
> > #include <sys/file.h>
> > int
> > main()
> > {
> >   int fd = open("asdf.txt", O_BINARY | O_RDWR | O_NOINHERIT | O_CREAT);
> >   const char* buf =
> > "KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK\0";
> >   int i=0;
> >   write(fd, buf, strlen(buf));
> >   fcntl(fd,F_LCK_MANDATORY,0);
> >   assert(flock(fd,F_SETOWN)==0);
>                     ^^^^^^^^
>                     F_SETOWN is no valid flag for flock(2).

...and, btw., fcntl(fd, F_SETOWN) is only supported on sockets.


Corinna

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

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple