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  1. Commons Daemon
  2. DAEMON-246

jsvc fails to load libcap.so.2 from /lib64



    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 1.0.10
    • Fix Version/s: 1.0.11
    • Component/s: Jsvc
    • Labels:
    • Environment:

      Fedora Core 16 (x86_64, using an x86_64 jsvc), CentOS 5.5 (x86_86, using an x86_64 jsvc), Debian Squeeze (x86_64, using an i686 jsvc), Debian Wheezy (x86_64, using an i686 jsvc)


      I see this when running jsvc -debug ...

      Attemtping to load library /lib/libcap.so.2
      Attemtping to load library /lib/libcap.so.1
      Attemtping to load library /lib/libcap.so
      Attemtping to load library /usr/lib/libcap.so.2
      Attemtping to load library /usr/lib/libcap.so.1
      Attemtping to load library /usr/lib/libcap.so
      failed loading capabilities library – /usr/lib/libcap.so: cannot open shared
      object file: No such file or directory.

      This does not work on 64bit Fedora, as the lib directory is /lib64/.

      It also won't work if you're using a 32bit copy of jsvc on a 64bit copy of Debian, which has a similar problem (the 32bit copy of libcap.so.2 is found at /lib32/libcap.so.2).

      These alternative library locations are mentioned in the Linux filesystem hierarchy standard (http://refspecs.linuxfoundation.org/FHS_2.3/fhs-2.3.html#LIBLTQUALGTALTERNATEFORMATESSENTIAL).

      The hard-coded /lib and /usr/lib paths in jsvc are counter-productive in the environments mentioned, and also in environments where the user expects to be able to control the library search path with the LD_LIBRARY_PATH environment variable. jsvc should be utilising the normal ld.so search path. This can be achieved even with a desire to be able to load either version 1 or 2 of libcap (as requested in https://issues.apache.org/jira/browse/DAEMON-234) because you don't need to give a full path to dlopen, according to its man page on Linux:

      "If filename contains a slash ("/"), then it is interpreted as a (relative or absolute) pathname. Otherwise, the dynamic linker searches for the library as follows ... (see ld.so(8) for further details)"

      So the issue can be resolved by simply making libcap_locs contain the desired filenames rather than pathnames. Patch will be attached shortly.


        1. patch.txt
          0.5 kB
          Emily Middleton



            • Assignee:
              emily middleton Emily Middleton
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