"Luís Oliveira" <[EMAIL PROTECTED]> writes: > On Thu, May 22, 2008 at 12:01 AM, Rupert Swarbrick > <[EMAIL PROTECTED]> wrote: >> I realise that that's not the sort of question for the cffi list, >> _but_ I wrote a trivial C program that I think should be equivalent >> and it doesn't die. I can't work out *how* libsane can work in one >> case and not the other (!) so I was wondering if anyone could make any >> suggestions. I'm attaching the two source files here. > > The only difference I could spot between the C and Lisp programs is > that version should be an :int, not a :pointer. (But that doesn't > matter on 32-bit linux since they're the same size there.) In any > case, it seems to work for me on Linux/amd64. > > Have you tried running the program in other Lisps? CLISP and/or CMUCL, > for instance. > Hi there,
Thanks for the reply and sorry for the delay - I've been doing exams. I have now tried with clisp and cmucl and they both segfault. This is with the debian unstable versions of clisp, cmucl, cl-cffi. I presume there's something weird happening with my system's libsane library, which would explain why no-one else's versions die, but I would like to try and work out why the lisp versions are crashing and the trivial C version not. However, I tried starting up sbcl with gdb and it was a bit too unpleasant - gdb reported about 5 [1] segfaults per line in the repl, but everything carried on working (well until I loaded my test2.lisp file [2]). I'd be really interested to debug/analyse what's going on here - there must be a problem somewhere! Can anyone recommend ways in which I can somehow trap whatever's falling over and catch the segfault? Or suggest how I might find what's going wrong? I have no idea who's bug this is, but I'd like to understand why I can trigger it so reliably! Thank you very much for any suggestions, Rupert [1] Er this was the other night. That's a rough estimate. [2] Included below. Dies every time.
test2.lisp
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pgpxy0sLsawtt.pgp
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