[Bug libc/23751] New: Malfunction of semctl() called from a shared object

["marcin at sacha dot pl" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23751

            Bug ID: 23751
           Summary: Malfunction of semctl() called from a shared object
           Product: glibc
           Version: 2.13
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: marcin at sacha dot pl
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Created attachment 11305
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11305&action=edit
simple test program

The semctl() function returns wrong values in sem_perm structure when used in a
shared object. When called from a standalone program (ie. a plain main()
function) values are correct and reflect real semaphore attributes. The error
regards IPC_STAT and SEM_STAT commands.

In the attachment you can find a simple test program. Build it in two ways -
first as a single executable, and a second as an executable (prog.c) and a
shared library (lib.c). Then create some semaphores on the system and compare
the results of both versions of the program.

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