Date: Wed, 30 Nov 2016 11:59:20 +0100 From: Matthieu Volat <mazhe@alkumuna.eu> To: freebsd-java@freebsd.org Subject: Trying to locate function using dlfunc with RLTD_NEXT from JNI Message-ID: <20161130115920.444d7a76@freedom.alkumuna.eu>
index | next in thread | raw e-mail
[-- Attachment #1 --] Hi, a (maybe not) tricky question for people who know well the internals of the jdk on freebsd... Trying to port a linux project that does quite a bit of introspection, begining by using malloc & co wrapper, with java binding, I found that strangely, you can use dlfunc(RTLD_NEXT, "malloc") in a non-java environment... But as soon as this code is loaded in the context of the jvm, the symbol won't be resolved. This is maybe a bit suprising as this technique worked on Linux and I did not expect much difference here... Small demonstration code: % git clone https://gist.github.com/f6993d7a48ecbab6c0c979b9a7a40912.git jni_dlfunc % cd jni_dlfunc % make [...] % ./testfoo malloc function located at 0x800ade210 % java -Djava.library.path=. testfoo could not locate function malloc: Undefined symbol "malloc" Would anybody have an idea of why the jvm would cause the C symbols not to be found via RTLD_NEXT and if there would be a way to workaround it (that is not to load explicitely "/lib/libc.so.7")? Thanks in advance -- Matthieu Volat <mazhe@alkumuna.eu> [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iF0EARECAB0WIQTxuiqPSkQnzRDOjsP4Q0N5gpmLfgUCWD6xCAAKCRD4Q0N5gpmL flWbAJ9woUj/gdMPX6mQwUwN85+YKTi6/QCglXpZjhGVDx759S7tbD3YINOZmLU= =ek2v -----END PGP SIGNATURE-----help
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20161130115920.444d7a76>