[Bug nptl/18536] sem_* tdelete, tfind, tsearch, twalk namespace

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https://sourceware.org/bugzilla/show_bug.cgi?id=18536

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d051b143f73189311faf9cd311cc53c6f6a145db

commit d051b143f73189311faf9cd311cc53c6f6a145db
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Jun 17 20:11:58 2015 +0000

    Fix sem_* tdelete, tfind, tsearch, twalk namespace (bug 18536).

    The sem_* functions bring in references to tdelete, tfind, tsearch and
    twalk.  But the t* functions are XSI-shaded, while sem_* aren't.  This
    patch fixes this by using __t* instead, exporting those functions from
    libc at version GLIBC_PRIVATE (since sem_* are in libpthread) and
    using libc_hidden_* for the benefit of calls within libc.

    Tested for x86_64 and x86 (testsuite, and comparison of disassembly of
    installed stripped shared libraries).  libpthread gets changes from
    PLT reordering; addresses in libc change because of PLT / dynamic
    symbol table changes.

        [BZ #18536]
        * misc/tsearch.c (__tsearch): Use libc_hidden_def.
        (__tfind): Likewise.
        (__tdelete): Likewise.
        (__twalk): Likewise.
        * misc/Versions (libc): Add __tdelete, __tfind, __tsearch and
        __twalk to GLIBC_PRIVATE.
        * include/search.h (__tsearch): Use libc_hidden_proto.
        (__tfind): Likewise.
        (__tdelete): Likewise.
        (__twalk): Likewise.
        * nptl/sem_close.c (sem_close): Call __twalk instead of twalk.
        Call __tdelete instead of tdelete.
        * nptl/sem_open.c (check_add_mapping): Call __tfind instead of
        tfind.  Call __tsearch instead of tsearch.
        * sysdeps/sparc/sparc32/sem_open.c (check_add_mapping): Likewise.
        * conform/Makefile (test-xfail-POSIX/semaphore.h/linknamespace):
        Remove variable.
        (test-xfail-POSIX2008/semaphore.h/linknamespace): Likewise.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                        |   20 ++++++++++++++++++++
 NEWS                             |    2 +-
 conform/Makefile                 |    2 --
 include/search.h                 |    4 ++++
 misc/Versions                    |    1 +
 misc/tsearch.c                   |    4 ++++
 nptl/sem_close.c                 |    4 ++--
 nptl/sem_open.c                  |    5 +++--
 sysdeps/sparc/sparc32/sem_open.c |    5 +++--
 9 files changed, 38 insertions(+), 9 deletions(-)

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