How to verify LD_PRELOAD is running?

Question

I know that LD_PRELOAD is set my so library before any another so libraries.

LD_PRELOAD=my_lib.so ./my_exec

How can I watch it? Is there any path like /proc/pid/... that show the order of libraries that loaded for this process?

Answer 1

Look in /proc/$pid/maps, you should see the library there if it's loaded. As for checking the order of loading, the "before" part is by definition, to quote the man page:

LD_PRELOAD

A list of additional, user-specified, ELF shared objects to be loaded before all others.