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  • From: "ldai" <ldai AT accunettech.com>
  • To: FreeTDS Development Group <freetds AT lists.ibiblio.org>, FreeTDS Development Group <freetds AT lists.ibiblio.org>
  • Subject: Re: [freetds] memory leak for connect with db-lib
  • Date: Tue, 1 Jun 2004 16:35:40 +0800

On Mon, 31 May 2004 11:54:47 -0400, James K. Lowden wrote
> On Mon, 31 May 2004, "ldai" <ldai AT accunettech.com> wrote:
> > On Thu, 27 May 2004, ZIGLIO, Frediano, VF-IT wrote
> > > >
> > > > Hi, everybody:
> > > > I user freeTDS 0.61-2 rpm to develop db-lib programe to access
> > > > MS-
> > > > SQLSREVER from linux enrivement. Now I found that I'm just
> > > > only to connect db
> > > > and to release connection, it will cost about 200k memory and
> > > > don't release
> > > > every time.
> ...
> > > You should call dbinit/dbexit only once.
> ...
> > I modifed code to call dbinit() and dbexit() only once, but I still
> > found
> > the memory leak.
> > I have developed software in Linux9 and accessed Ms-Sql or Sybase with
> >
> > freeTDS. I observered the memory leak with "top -p pid" in linux.
>
> http://dmalloc.com/
>
> Please give dmalloc a try. It should help track down what's wrong.
> If the problem turns out to be in FreeTDS, naturally we'd want it
> fixed. Patches accepted, too. :-)
>
> --jkl
> _______________________________________________
> FreeTDS mailing list
> FreeTDS AT lists.ibiblio.org
> http://lists.ibiblio.org/mailman/listinfo/freetds
Hi:
Thank you reply and suggestion.
I downloaded dmalloc rpm and installed in linux9. I got result, which it
occured memory leak in call dbstring_concat.Then I found Edward Quackenbush
[EdwardQuackenbush at symantec.com Thu Jan 29 16:28:21 EST 2004 ]'s report in
mailing list. He found memory leak during calling dbstring_free function and
fixed it. I did the same fixed as Edward Quackenbush and tried again.I found
the code has not occurred memory leak.
His code is :
--- ../freetds-0.62.1/src/dblib/dblib.c Fri Dec 26 18:11:08 2003
+++ ../freetds-0.62.1-werking/src/dblib/dblib.c Thu Jan 29 20:18:18 2004
@@ -737,9 +737,6 @@
if ((*dbstrp)->strnext != NULL) {
dbstring_free(&((*dbstrp)->strnext));
}
+ if ((*dbstrp)->strtext != NULL) {
+ free((*dbstrp)->strtext);
+ }
free(*dbstrp);
*dbstrp = NULL;
}

I think he is right. It will occurr memory leak in calling dbstring_free().
I think it is a bug to be fixed. The memory leak will occurr in linux9.
Do you think?

Thank your help very much.

Best regards.
leon
1st, June 2004



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