On Mon, 19 Jul 2004, Chris January wrote:
> > However, the fix is not as simple as inserting a "size =
> > bufalloc;" just before the RegQueryValueEx. When I do that,
> > I get a SIGSEGV in the guts of iasperf.dll, which I have yet
> > to track down. This happens on the second iteration, FWIW,
> > with buffer increment of 1000. I'm going to investigate some
> > more, but I'd say that with the above bug, this key was never
> > tested, so I have no idea what's going on. Hopefully Chris
> > (January) can use this to help him track down the problem.
>
> I'm back from my honeymoon (!)
Great, hope you enjoyed it...
> and I've just been catching up on this thread.
...and I'm sure you didn't enjoy this. :-)
> Are you still seeing the segfault Igor? If so I'll try to track it down
> if I have any spare time.
Yes, I'm still seeing the segfault in the latest snapshot, but only when
run under gdb or strace. Here are some sample tests:
$ cat /proc/registry/HKEY_PERFORMANCE_DATA/\@ > e.out
cat: /proc/registry/HKEY_PERFORMANCE_DATA/@: No such file or directory
$ # no segfault
$ strace -o cat_HKPD.strace cat /proc/registry/HKEY_PERFORMANCE_DATA/\@ > e.out
2262669 [main] cat 2400 handle_exceptions: Exception: STATUS_ACCESS_VIOLATION
2264445 [main] cat 2400 open_stackdumpfile: Dumping stack trace to cat.exe.stackdump
$
I can also send you cat_HKPD.strace, but it's not very informative. Let
me know if you can't reproduce this and need me to debug this locally.
FWIW, I have a working piece of Win32 code that does read this key
correctly (essentially a stripped down MS example). Let me know if you
need it.
> As you can probably tell I never tested the HKEY_PERFORMANCE_DATA key.
Yep, so I surmised.
> Increasing the buffer size in increments is of course boilerplate code
> but I managed to cod it up regardless. Sigh.
>
> Chris January
HTH,
Igor
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