Date: Mon, 18 Aug 1997 16:38:30 -0600 (MDT) From: Nate Williams <nate@mt.sri.com> To: Brian Mitchell <brian@firehouse.net> Cc: Nate Williams <nate@mt.sri.com>, "Jordan K. Hubbard" <jkh@freebsd.org>, hackers@freebsd.org Subject: Re: [Fwd: Re: Please Help Me Understand dlopen()] Message-ID: <199708182238.QAA03400@rocky.mt.sri.com> In-Reply-To: <Pine.BSI.3.95.970818182539.4166A-100000@shell.firehouse.net> References: <199708182158.PAA03256@rocky.mt.sri.com> <Pine.BSI.3.95.970818182539.4166A-100000@shell.firehouse.net>
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>
> > > Hmmm - any comments, ld hackers?
> > >
> > > The freeBSD dlsym() is - as far as I know - the only dlsym()
> > > implementation that doesn't search for _funktion() ...
> >
> > Here's a quick and dirty patch that implements it. I tested it locally
> > w/out any problems, but it has lots of possible problems.
>
> openbsd's is another that does not look for underscores. freebsd's has a
> few other minor holes too. If you dlsym() a nonexistant symbol, freebsd
> (in 2.2.1 atleast) returns a NULL pointer but does not (as it should) set
> the dlerror() errorcode.
Umm, yes it does. At least, it does in the version in 2.2.
>From ld/rtld/rtld.c:
if (np == NULL) {
generror("Undefined symbol");
return NULL;
generror sets the dlerror() error string.
I'm working on a better fix than I sent out now, but it's not as easy as
it could be due to the way the code is laid out.
Nate
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