102.3 Manage Shared Libraries LPIC-1 Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   In which order does the dynamic linker search for shared libraries when a program is executed?

   • AOnly the cache file /etc/ld.so.cache is searched.
   • BThe cache file /etc/ld.so.cache, then LD_LIBRARY_PATH, then the default directories.
   • CLD_LIBRARY_PATH, then the cache file /etc/ld.so.cache, then the default directories /lib and /usr/lib.
   • DThe default directories /lib and /usr/lib, then LD_LIBRARY_PATH, then the cache.
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2. 12application · medium

   A developer wants to test a new version of a library without affecting the system-wide installation. The library is currently in /usr/lib. What is the safest way to test the new version?

   • ASet LD_LIBRARY_PATH to the directory containing the new library for the test session.
   • BCopy the new library to /usr/local/lib and run ldconfig.
   • CAdd the new library path to /etc/ld.so.conf and run ldconfig.
   • DReplace the library in /usr/lib and run ldconfig.
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4. 13application · medium

   A developer asks you to explain why a program links against libfoo.so.2 even though libfoo.so.1 is installed. Which file or command would you inspect to explain the soname mismatch?

   • Afile /path/to/program
   • Bcat /etc/ld.so.conf
   • Creadelf -d /path/to/program
   • Dldconfig -p | grep libfoo
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5. 14expert · hard

   An application fails to start on a server, but the same binary works on a developer's workstation. The developer's workstation has LD_LIBRARY_PATH set to a custom directory. The server does not. Which command on the server would best reveal whether the missing library is simply not in the default search path?

   • Aldd /path/to/application
   • Benv | grep LD_LIBRARY_PATH
   • Cldconfig -p | grep <library>
   • Dreadelf -d /path/to/application
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6. 15application · medium

   A program fails to start with 'error while loading shared libraries: libncurses.so.5'. The system has libncurses.so.6 installed. Which approach is the most appropriate to resolve this without recompiling the program?

   • AReinstall the program from source.
   • BCreate a symlink libncurses.so.5 pointing to libncurses.so.6 in a directory in the linker path.
   • CRun ldconfig to update the cache.
   • DSet LD_PRELOAD to libncurses.so.6.
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