Re: BUG #1815: ECPGdebug causes crash on Windows XP - Mailing list pgsql-bugs

Thanks, I have added an additional sentence to that section outlining
the specific items that should match --- patch attached.

---------------------------------------------------------------------------

William ZHANG wrote:
> I remember that I have posted the answer to pgsql.bugs,
> but now it can only be found here:
>
> http://www.talkaboutdatabases.com/group/pgsql.bugs/messages/2346.html
>
> Do not know what's wrong with the mail list or my mails.
>
> "Bruce Momjian" <pgman@candle.pha.pa.us> wrote
> >
> > Ah, I have found the cause of the crash, and added documentation about
> > the cause:
> >
> > On Win32, if the <application>ecpg</> libraries and application are
> > compiled with different flags, this function call will crash the
> > application because the internal representation of the <literal>FILE</>
> > pointers differ.
> >
> > While such a mismatch is a problem on all platforms, it is more common
> > on Win32 where the FILE structure changes for debug, for example.
> >
> > --------------------------------------------------------------------------
> -
> >
> > Michael Meskes wrote:
> > > On Mon, Aug 15, 2005 at 07:39:42PM +0800, William ZHANG wrote:
> > > > Yes. It is reproducible. But it works well in MinGW.
> > > > Is there sth. wrong with the import library lib\ms\libecpg.lib or
> > > > lib\libecpg.dll?
> > > >
> > > > "Joshua Masiko" <joshua_masiko@yahoo.com>
> > > > wrote:20050813145453.48119.qmail@web33903.mail.mud.yahoo.com...
> > > > >
> > > > >  ntdll.dll!7c918fea()
> > > > >  ntdll.dll!7c9106eb()
> > > > >  ntdll.dll!7c90104b()
> > > > >  msvcrt.dll!77c3b90d()
> > > > >  msvcrt.dll!77c420e7()
> > > > >  libecpg.dll!6d0c7471()
> > > > >> ecpgtest.exe!main(int argc=1, char * *
> > > > > argv=0x003c0d10)  Line 5 + 0xc C
> > > > >  ecpgtest.exe!mainCRTStartup()  Line 206 + 0x19 C
> > > > >  kernel32.dll!7c816d4f()
> > > > >  kernel32.dll!7c8399f3()
> > > > >
> > > > >
> > > > > The offending line in ecpgtest.pgc is
> > > > >
> > > > > ECPGdebug(1,stderr);
> > > > >
> > > > > I get the same result even if I use a file handle
> > > > > obtained by using fopen
> > >
> > > Could someone with access to a Windows system have a look at this? I do
> > > not have one atm. In particular I'd like to know whether it makes a
> > > difference if your compiled ecpg with threading enabled or not. After
> > > all without threading the function called does not much, just changing
> > > two variables and logging the change.
> > >
> > > Michael
> > > --
> > > Michael Meskes
> > > Email: Michael at Fam-Meskes dot De, Michael at Meskes dot
> (De|Com|Net|Org)
> > > ICQ: 179140304, AIM/Yahoo: michaelmeskes, Jabber: meskes@jabber.org
> > > Go SF 49ers! Go Rhein Fire! Use Debian GNU/Linux! Use PostgreSQL!
> > >
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> >
> > --
> >   Bruce Momjian                        |  http://candle.pha.pa.us
> >   pgman@candle.pha.pa.us               |  (610) 359-1001
> >   +  If your life is a hard drive,     |  13 Roberts Road
> >   +  Christ can be your backup.        |  Newtown Square, Pennsylvania
> 19073
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> >
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>
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>                http://www.postgresql.org/docs/faq
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--
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073
Index: doc/src/sgml/ecpg.sgml
===================================================================
RCS file: /cvsroot/pgsql/doc/src/sgml/ecpg.sgml,v
retrieving revision 1.67
diff -c -c -r1.67 ecpg.sgml
*** doc/src/sgml/ecpg.sgml    25 Sep 2005 03:12:13 -0000    1.67
--- doc/src/sgml/ecpg.sgml    13 Oct 2005 17:45:12 -0000
***************
*** 1612,1618 ****
      On Win32, if the <application>ecpg</> libraries and an application are
      compiled with different flags, this function call will crash the
      application because the internal representation of the
!     <literal>FILE</> pointers differ.
      </para>
      </note>
     </listitem>
--- 1612,1620 ----
      On Win32, if the <application>ecpg</> libraries and an application are
      compiled with different flags, this function call will crash the
      application because the internal representation of the
!     <literal>FILE</> pointers differ.  Specifically,
!     threading/non-threading, release/debug, and static/dynamic flags should
!     be the same for the library and all applications using that library.
      </para>
      </note>
     </listitem>
Index: doc/src/sgml/libpq.sgml
===================================================================
RCS file: /cvsroot/pgsql/doc/src/sgml/libpq.sgml,v
retrieving revision 1.191
diff -c -c -r1.191 libpq.sgml
*** doc/src/sgml/libpq.sgml    25 Sep 2005 03:12:13 -0000    1.191
--- doc/src/sgml/libpq.sgml    13 Oct 2005 17:45:15 -0000
***************
*** 3520,3526 ****
  On Win32, if the <application>libpq</> library and an application are
  compiled with different flags, this function call will crash the
  application because the internal representation of the <literal>FILE</>
! pointers differ.
  </para>
  </note>
  </listitem>
--- 3520,3528 ----
  On Win32, if the <application>libpq</> library and an application are
  compiled with different flags, this function call will crash the
  application because the internal representation of the <literal>FILE</>
! pointers differ.  Specifically, threading/non-threading, release/debug, and
! static/dynamic flags should be the same for the library and all applications
! using that library.
  </para>
  </note>
  </listitem>