How does ruby load a shared library

Ruby
1

Hi,
I created an c extension which is linked with another shared library
named
libfoo.so.
When I use this extension in ruby script, it evoke an error message:
./demo.rb:3:in ‘require’: libfoo.so: cannot open shared object file: No
such
file or directory

If I move libfoo.so to /usr/lib, it works.
Is ther any other ways to deal with such problem? As I don’t want to put
the
library into /usr/lib or set the LD_LIBRARY_PATH.
Thanks in advance!

2

huiliang wu wrote:

Is ther any other ways to deal with such problem? As I don’t want to
put the
library into /usr/lib or set the LD_LIBRARY_PATH.
Thanks in advance!

Check out ldconfig(8)

3

Hi,

At Fri, 16 Jun 2006 16:58:09 +0900,
huiliang wu wrote in [ruby-talk:197609]:

Is ther any other ways to deal with such problem? As I don’t want to put the
library into /usr/lib or set the LD_LIBRARY_PATH.

It very depends on what your platform is. Some systems have
-rpath option and/or LD_RUN_PATH environment variable for ld.

4

On 6/16/06, huiliang wu [email protected] wrote:

Thanks in advance!

If you’re on GNU/Linux, maybe this article will help:
http://wiki.linuxquestions.org/wiki/Library-related_Commands_and_Files

—John

5

On Mon, Jul 10, 2006 at 05:35:01PM +0900, huiliang wu wrote:

I set LD_LIBRARY_PATH using export LD_LIBRARY_PATH=/foo and it works.
Now I want to set environment variable in my ruby script, so I use
ENV[‘LD_LIBRARY_PATH’] = “/foo”, but this time it doesn’t work.
What’s difference between using ENV in script and export in the linux shell?
Thanks in advance!

The first time LD_LIBRARY_PATH is available to the linux dynamic
linker when it loads and links ruby, the second time not.

-Jürgen

6

I set LD_LIBRARY_PATH using export LD_LIBRARY_PATH=/foo and it works.
Now I want to set environment variable in my ruby script, so I use
ENV[‘LD_LIBRARY_PATH’] = “/foo”, but this time it doesn’t work.
What’s difference between using ENV in script and export in the linux
shell?
Thanks in advance!