List symbols from a dynamic library (.so file)

nm --dynamic <libfile.so>
You can get what functions at which addresses are inside a dynamic link library by this tool.

2
By: Vereb
2009-09-13 09:27:57

These Might Interest You

  • file displays a files type the -L flag means follow sym-links (as libraries are often sym-linked to another this behavior is likely preferred) more complex behavior (*two* grep commands!) could be used to determine if the file is or is not a shared library.


    -3
    file -L <library> | grep -q '64-bit' && echo 'library is 64 bit' || echo 'library is 32 bit'
    infinull · 2010-03-07 06:31:35 0
  • shows which shared lib files are pointed to by the dynamic linker.


    3
    ldconfig -p
    wwest4 · 2009-02-05 21:02:59 0
  • Determines the flavor of a shared library by looking at the addresses of its exposed functions and seeing if they are 16 bytes or 8 bytes long. The command is written so the library you are querying is passed to a variable up font -- it would be simple to convert this to a bash function or script using this format. Show Sample Output


    2
    libquery=/lib32/libgcc_s.so.1; if [ `nm -D $libquery | sed -n '/[0-9A-Fa-f]\{8,\}/ {p; q;}' | grep "[0-9A-Fa-f]\{16\}" | wc -l` == 1 ]; then echo "$libquery is a 64 bit library"; else echo "$libquery is a 32 bit library"; fi;
    birnam · 2010-03-07 04:24:08 0
  • One base component is our hardware detection. It is a C++ library and app and is designed after a dynamic structure. Any kind of hardware, no matter if usb or pci, can be configured by mhwd. There is just a simple configuration file which tells mhwd what to do. This way we also support hybrid graphics cards out of the box. However there are currently only mhwd configs for nvidia optimus setups. But this gap will be filled soon. Just play with some of those commands to get a feeling about mhwd. Show Sample Output


    1
    mhwd --help
    unixmonkey57489 · 2013-05-16 14:30:18 0

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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