Re: Mac OS X, PostgreSQL, PL/Tcl

I'll grab the CVS PG copy and try it out. Is this something the Darwin 
folks should be notified about? It might cause problems with other 
apps.

thanks,

/s.


On Feb 22, 2004, at 4:47 PM, Tom Lane wrote:

> Scott Goodwin <scott@scottg.net> writes:
>> Found the problem. If I have a very long environment variable exported
>> and I start PG, PG crashes when I try to load PG/Tcl. In my case I use
>> color ls and I have a very long LS_COLORS environment variable set.
>
> I was able to duplicate this.  I am not entirely sure why the problem 
> is
> dependent on the environment size, but I now know what causes it.
> It seems Darwin's libc keeps its own copy of the argv pointer, and when
> we move argv and then scribble on the original, it causes problems for
> subsequent code that tries to look at argv[0] to determine the
> executable's location.  (It's a good thing Darwin is open source, 
> 'cause
> I'm not sure we'd have ever seen the connection if we hadn't been able
> to look at the source code for their libc.)
>
> The fix is basically
>
> + #if defined(__darwin__)
> + #include <crt_externs.h>
> + #endif
>
> + #if defined(__darwin__)
> +         *_NSGetArgv() = new_argv;
> + #endif
>
> which you can stick into main.c if you need a workaround.  I applied a
> more extensive patch to HEAD that refactors this code into ps_status.c,
> but I'm disinclined to apply that patch to stable branches...
>
>             regards, tom lane
>