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[Bug libc/21530] tmpfile() should be implemented using O_TMPFILE


https://sourceware.org/bugzilla/show_bug.cgi?id=21530

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e0d2eb5a798613f9c24ad0056da86c8cfd19043d

commit e0d2eb5a798613f9c24ad0056da86c8cfd19043d
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Mon Jun 26 11:52:14 2017 -0300

    linux: Implement tmpfile with O_TMPFILE (BZ#21530)

    This patch adds O_TMPFILE support to tmpfile on Linux.  This is
    similar to the previous suggestion by Andreas Schwab [1] with the
    difference the file descriptor creation is parameterized to
    compartmentalize Linux only open flags (O_TMPFILE) on sysdeps.

    Checked on x86_64-linux-gnu.

        Adhemerval Zanella  <adhemerval.zanella@linaro.org>
        Andreas Schwab  <schwab@suse.de>

        [BZ #21530]
        * include/stdio.h (__gen_tempfd): New function.
        * stdio-common/Makefile (routines): Add gentempfd.
        * stdio-common/gentempfd.c: New file.
        * sysdeps/unix/sysv/linux/gentempfd.c: Likewise.
        * stdio-common/tmpfile.c (tmpfile): First try to use a system specific
        unnamed file first.

    [1] https://sourceware.org/ml/libc-alpha/2017-06/msg01293.html

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

Summary of changes:
 ChangeLog                                          |   11 ++++++++
 include/stdio.h                                    |    3 ++
 stdio-common/Makefile                              |    2 +-
 support/xpipe.c => stdio-common/gentempfd.c        |   14 ++++------
 stdio-common/tmpfile.c                             |   26 +++++++++++++-------
 .../unix/sysv/linux/gentempfd.c                    |   22 +++++++++-------
 6 files changed, 50 insertions(+), 28 deletions(-)
 copy support/xpipe.c => stdio-common/gentempfd.c (83%)
 copy support/xaccept4.c => sysdeps/unix/sysv/linux/gentempfd.c (66%)

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