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>
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--Sig_/4vx_.ADWKIJfbGuP5psnx0k Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable 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, begi= ning by using malloc & co wrapper, with java binding, I found that strangel= y, 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 n= ot expect much difference here... Small demonstration code: % git clone https://gist.github.com/f6993d7a48ecbab6c0c979b9a7a40912.git = jni_dlfunc % cd jni_dlfunc % make [...] % ./testfoo=20 malloc function located at 0x800ade210 % java -Djava.library.path=3D. 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 i= s not to load explicitely "/lib/libc.so.7")? Thanks in advance --=20 Matthieu Volat <mazhe@alkumuna.eu> --Sig_/4vx_.ADWKIJfbGuP5psnx0k Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- iF0EARECAB0WIQTxuiqPSkQnzRDOjsP4Q0N5gpmLfgUCWD6xCAAKCRD4Q0N5gpmL flWbAJ9woUj/gdMPX6mQwUwN85+YKTi6/QCglXpZjhGVDx759S7tbD3YINOZmLU= =ek2v -----END PGP SIGNATURE----- --Sig_/4vx_.ADWKIJfbGuP5psnx0k--
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