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Date: Fri, 19 Jul 2013 12:03:29 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: sqlite defect
Message-ID: <20130719100329.GC20871@calimero.vinschen.de>
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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).

Corinna

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

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