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To: cygwin AT cygwin DOT com
From: jojelino <jojelino AT gmail DOT com>
Subject: Re: sqlite defect
Date: Fri, 19 Jul 2013 10:56:16 +0900
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Message-ID: <ksa6bs$ac9$1@ger.gmane.org>
References: <trinity-fdc5a0b5-6dcf-4fc0-9370-dd32a75fe928-1373654994500 AT 3capp-gmx-bs47> <51E703FB DOT 1010300 AT etr-usa DOT com> <trinity-1068d666-3dec-43c9-8453-39c7cae3a94c-1374102947415 AT 3capp-gmx-bs33> <51E74AB4 DOT 7010508 AT etr-usa DOT com> <ks87ur$nle$1 AT ger DOT gmane DOT org> <20130718085953 DOT GC9628 AT calimero DOT vinschen DOT de>
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In-Reply-To: <20130718085953.GC9628@calimero.vinschen.de>

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?
 >
 >
 > Corinna
 >
#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);
   assert(flock(fd,F_SETOWN)==0);
   assert(flock(fd,LOCK_NB|LOCK_UN)==0);
   fcntl(fd,F_LCK_MANDATORY,1);
   assert(flock(fd,F_SETOWN)==0);
   assert(flock(fd,LOCK_NB|LOCK_UN)==0);
   assert(flock(fd,F_SETOWN)==0);
   assert(flock(fd,F_SETOWN)==0); /* assertion "flock(fd,F_SETOWN)==0" 
failed: file "f_lck.c", line 28, function: main */
   return 0;
}

/**/
-- 
Regards.


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