I am not sure where to place this thread. I am new to this forum. I have a question about
an IBM example in one of their technical reports.

In that example they are demonstrating how to override a function in a gnu library. The code is

export LD_PRELOAD=libfuncs.so
export LD_LIBRARY_PATH=.:$LD_LIBRARY_PATH
./setresgid-tester
It's me the shim. Hi there!

I know about preoload files, but I thought that you had to put not only the file name, but its path into the PRE_LOAD command.

Also. what is gong on on the next line? It seems to be nonsense. I know it is not.

export LD_LIBRARY_PATH=.:$LD_LIBRARY_PATH

What is with the .: in the command. It is needed because the output of ./setresgid-tester is different if it is left out.

Is it a good idea to change the LD_LIBRARY_PATH by adding an additional path?

Any help appreciated. Thanks in advance.

Respectfully,


jyunker

The . is the current directory, by adding it in they have enabled the ability to PRELOAD the library from the current directory which is why they have not given it's path.