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  • From: Daniel Parnell <me AT danielparnell.com>
  • To: FreeTDS Development Group <freetds AT lists.ibiblio.org>
  • Subject: Re: [freetds] I'm having a crashing problem with FreeTDS under OSX
  • Date: Sun, 8 Mar 2009 22:07:01 +1100

Here is the version output from gcc

i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5490)

I wasn't aware that FreeTDS used it's own memory allocator.
I've not had any problems like this with any of the installs I've done in the past (and I've done a lot of them).

Daniel

On 08/03/2009, at 9:55 PM, Frediano Ziglio wrote:

2009/3/8 Daniel Parnell <me AT danielparnell.com>:
Hi James,

Looks like I've got things working on my machine.
What I had to do was replace any calls to strdup with a new function
tds_strdup.
I also have to replace the call to asprintf in odbc.c with sprintf
into a character array and a tds_strdup (not too happy about that one).

It's very VERY strange that I should need to do this. I've tried
replicating the problem with a smaller application without success.

Daniel


Mmmm... this can be the problem

http://osdir.com/ml/web.curl.general/2004-12/msg00080.html

does Mac OS X has asprintf ?? Try using only your tds_strdup.

Reading at
http://developer.apple.com/documentation/Darwin/Reference/Manpages/man3/asprintf.3.html
it seems that same problem apply also to asprintf/vasprintf. They
returns pointers malloc-ed with libc but if free is not from libc you
get heap corruption. The solution is to use a tds_strdup (as you did)
and say in configure that you don't have asprintf/vasprintf so FreeTDS
will compile a version that use proper malloc.

Which compiler are you using?

Another solution would be to link FreeTDS with libc malloc/free.

freddy77
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