How to check what shared libraries are loaded at run time for a given process?

Question

Is there a way to check which libraries is a running process using?

To be more specific, if a program loads some shared libraries using dlopen, then readelf or ldd is not going to show it. Is it possible at all to get that information from a running process? If yes, how?

Answer 1

Other people are on the right track. Here are a couple ways.

cat /proc/NNNN/maps | awk '{print $6}' | grep '\.so' | sort | uniq 

Or, with strace:

strace CMD.... 2>&1 | grep -E '^open(at)?\(.*\.so' 

Both of these assume that shared libraries have ".so" somewhere in their paths, but you can modify that. The first one gives fairly pretty output as just a list of libraries, one per line. The second one will keep on listing libraries as they are opened, so that's nice.

And of course lsof...

lsof -p NNNN | awk '{print $9}' | grep '\.so' 

Answer 2

May be lsof - the swiss army knife of linux will help?

edit: to run, lsof -p <pid>, lists all sorts of useful information, for example, if the process is java, lists all the open jars - very cool...