[Bug libc/18519] aio_* pread namespace

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https://sourceware.org/bugzilla/show_bug.cgi?id=18519

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9714012ca015f1f6763f66bd74d6f3f9e1512b36

commit 9714012ca015f1f6763f66bd74d6f3f9e1512b36
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Fri Jun 12 17:34:11 2015 +0000

    Fix aio_* pread namespace (bug 18519).

    aio_* bring in references to pread, which isn't in all the standards
    containing aio_* (as a reference from one library to another, this is
    a bug for dynamic as well as static linking).  This patch fixes this
    by using __libc_pread instead, exporting that function from libc at
    symbol version GLIBC_PRIVATE; the code, with conditionals that may
    call either __pread64 or __libc_pread, becomes exactly analogous to
    that elsewhere in the same file that may call either __pwrite64 or
    __libc_pwrite.

    Tested for x86_64 and x86 (testsuite, and comparison of disassembly of
    installed shared libraries).  libc changes because of the PLT entry
    for the newly exported __libc_pread; librt changes because of
    assertion line numbers and PLT rearrangement; other stripped installed
    shared libraries do not change.

        [BZ #18519]
        * posix/Versions (libc): Export __libc_pread at version
        GLIBC_PRIVATE.
        * sysdeps/pthread/aio_misc.c (handle_fildes_io): Call __libc_pread
        instead of pread.
        * conform/Makefile (test-xfail-POSIX/aio.h/linknamespace): Remove
        variable.

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

Summary of changes:
 ChangeLog                  |    8 ++++++++
 NEWS                       |    2 +-
 conform/Makefile           |    1 -
 posix/Versions             |    2 +-
 sysdeps/pthread/aio_misc.c |    9 +++++----
 5 files changed, 15 insertions(+), 7 deletions(-)

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