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Editorial Team
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Asked: 2026-06-15T03:43:15+00:00

If I execute a binary in a clearcase view, and look at /proc/self/exe for

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If I execute a binary in a clearcase view, and look at /proc/self/exe for that on Linux, I see something like the following:

$ cd /proc/19220
$ ls -l exe
lrwxrwxrwx 1 peeterj pdxdb2 0 2012-11-30 13:04 exe -> /home/peeterj/views/peeterj_clang-7.vws/.s/00024/8000028250b8f1d1llvm-config

The clang llvm-config program, not unreasonably, uses this output to try to figure out the absolute fully qualified path that it is located in (I assume in case argv[0] isn’t fully qualified).

Is there a way to find the location within the view that this corresponds to. For example, in this case, the llvm-config exe is actually in:

/vbs/bldsupp/linuxamd64/clang/debug/bin

(I’m wondering if it’s feasible to modify clang’s GetExecutablePath() function to figure this out.)

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1 Answer

  1. Editorial Team

    No trivial solution here (for an old version of ClearCase though):

    The technote "PK27447: WITHIN A CLEARCASE DYNAMIC VIEW, THE READLINK() CALL ON LINUX RETURNS THE WRONG PATH FOR THE EXECUTABLE’S /PROC/SELF/EXE VALUE" suggests:

    Local fix

    1. Use getcwd(), get_current_dir_name(), getwd() in applications slated for a VOB/View context
      2. Create an interposer library to intercept the readlink() call, and modify to use any of the above calls to return the proper data

    The cause:

    /proc/self/exe returns the improper path while getcwd succeeds.

    Unfortunately, for /proc/self/exe to return the proper value [from within a VOB/View context] would require a change within the Linux kernel to allow MVFS to "override" the present setting.

    IBM LTC has been working on having the Linux community adopt this change so that we can then incorporate the new features within MVFS.

    Related: Bug Sun 6189256.

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