Programming way to list shared library dependency on linux

Question

Is there any programming way (system call?) to list shared library dependency on Linux? Instead of using ldd ...

Answer 1

readelf -Wa lib.so|grep NEEDED

Answer 2

Gentoo Linux has an lddtree.sh http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-projects/pax-utils/lddtree.sh?revision=1.22&content-type=text%2Fplain

You may find it helpful.