dlsym can't use handle returned by dlopen?
markus.hoenicka at mhoenicka.de
Wed Nov 12 16:09:50 PST 2008
FreeBSD yeti.mininet 6.1-RELEASE FreeBSD 6.1-RELEASE #1: Mon Aug 28 22:24:48 CEST 2006 markus at yeti.mininet:/usr/src/sys/i386/compile/YETI i386
I'm trying to do the following: libdbi (http://libdbi.sourceforge.net)
is a database abstraction layer which is linked as a shared object
into applications. The libdbi library uses dlopen() to load database
drivers which in turn are linked against database client
libraries. Now I want to access functions defined in the database
client library from within the libdbi library. In brief, I thought
this is going to work like this:
dlhandle = dlopen("path", RTLD_NOW);
function_pointer = dlsym(dlhandle, "function_name");
dlhandle is not NULL and does not crash the app when passed to
dlclose(), so I assume the handle is valid. Accessing the functions
does work on most systems (Linux, OSX, Cygwin, to name a few), but I
get "Undefined symbol" errors on FreeBSD. Interestingly, the following
function_pointer = dlsym(RTLD_DEFAULT, "function_name");
Why is that? Or rather: what am I doing wrong?
Any help is appreciated.
markus.hoenicka at cats.de
(Spam-protected email: replace the quadrupeds with "mhoenicka")
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