[Bug stdio/20005] fflush on a file opened with fmemopen resets position to 0

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20005

--- Comment #7 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".

The branch, gentoo/2.23 has been updated
       via  4a003be3ae533aedb3f5c79424ba046f3bb0af77 (commit)
      from  7331d984691b31a1c43bae54f4596a37fd9e7dcb (commit)

Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.

- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4a003be3ae533aedb3f5c79424ba046f3bb0af77

commit 4a003be3ae533aedb3f5c79424ba046f3bb0af77
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Tue Apr 26 17:40:25 2016 -0300

    libio: Update internal fmemopen position after write (BZ #20005)

    Current GLIBC fmemopen fails with a simple testcase:

      char buffer[500] = "x";
      FILE *stream;
      stream = fmemopen(buffer, 500, "r+");
      fwrite("fish",sizeof(char),5,stream);
      printf("pos-1:%ld\n",ftell(stream));
      fflush(stream);
      printf("pos-2:%ld\n",ftell(stream));

    It returns:

      pos-1:5
      pos-2:0

    Where it should return:

      pos-1:5
      pos-2:5

    This is due the internal write function does not correctly update the
internal
    object position state and then the seek operation returns a wrong value. 
This
    patch fixes it.

    It fixes both BZ #20005 and BZ #19230 (marked as duplicated). A new test is
    added to check for such case.

    Tested on x86_64 and i686.

    This is a backport of f9123b5003e62b6e54996076e860f23aee9a0593.

        * libio/fmemopen.c (fmemopen_write): Update internal position after
        write.
        * stdio-common/Makefile (tests): Add tst-fmemopen4.c.
        * stdio-common/tst-fmemopen4.c: New file..

    (cherry picked from commit c2fba3b047c2fac50985a47ff96075b5d9078432)

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

Summary of changes:
 libio/fmemopen.c                                   |    6 +-
 stdio-common/Makefile                              |    2 +-
 .../tst-rwlock13.c => stdio-common/tst-fmemopen4.c |   41 ++++++++++----------
 3 files changed, 25 insertions(+), 24 deletions(-)
 copy nptl/tst-rwlock13.c => stdio-common/tst-fmemopen4.c (53%)

-- 
You are receiving this mail because:
You are on the CC list for the bug.