LD_LIBRARY_PATH : how to find a shared object
I have a shared object ( libxyz.so ). Given LD_LIBRARY_PATH, how can find the exact location of this shared object? If i had a binary that depends on this lib, i would have used ldd on that.
Here is the reason why i ask: I have a cgi script which works when using LD_LIBRARY_PATH set to say VALUE1. It does not work when the path is set to VALUE2. I开发者_StackOverflow中文版 would like to find the exact location of the library as specified by the path in VALUE1 ( Note that VALUE1 has almost 20+ different locations )
Platform: Linux
Put this in a file:
#!/bin/bash
IFS=:
for p in ${LD_LIBRARY_PATH}; do
if [ -e ${p}/libxyz.so ]; then
echo ${p}
fi
done
and run it.
You can also use ldd. To do this, you would:
- Set LD_LIBRARY_PATH to the value when it works (i.e.
export LD_LIBRARY_PATH=VALUE1
) - Run
ldd /path/to/prog | grep libxyz.so
put a sleep(30); in your cgi, launch it from a browser, then look into /proc/$(pidof mycgi)/maps for actual libs used by your program.
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