On Fri, Jan 9, 2009 at 1:06 AM, John Fremlin <j...@msi.co.jp> wrote: > However, there is no guarantee that between calling your function and > getting the errno, the Lisp environment will not call a C function that > resets errno.
I guess this is more of a problem in Lisps with userspace threads. Are there other situations? (Signal handlers shouldn't mess with errno... Maybe GC hooks?) Any idea how Allegro implements this? > In SBCL there is a native get-errno function to get the errno. > > Is there any plan to add a semi-portable wrapper to this functionality > for CFFI? Adding a CFFI-SYS:GET-ERRNO function sounds like a good idea. I don't understand the other bit well enough yet to have an opinion. > If not, would you accept a patch for it? I guess the obvious way is to > modify (cffi:defcfun ...) to take a :after-collect-value argument, so > that it could work not only for errno Indeed, it'd be useful for GetLastError() as well, etc. -- Luís Oliveira http://student.dei.uc.pt/~lmoliv/ _______________________________________________ cffi-devel mailing list cffi-devel@common-lisp.net http://common-lisp.net/cgi-bin/mailman/listinfo/cffi-devel
