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[Bug libc/21584] sigaltstack etc namespace


https://sourceware.org/bugzilla/show_bug.cgi?id=21584

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=21f8859dd08fd231198eda4095061837d527b926

commit 21f8859dd08fd231198eda4095061837d527b926
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Mon Jun 19 12:00:13 2017 +0000

    Fix signal stack namespace (bug 21584).

    In POSIX.1:2008, various signal stack symbols - sigaltstack, SS_*,
    SIGSTKSZ, MINSIGSTKSZ - are all XSI-shaded.  glibc wrongly makes them
    visible for non-XSI POSIX.  This patch fixes the conditionals, leaving
    the symbols available for __USE_MISC as it seems likely some of them
    are widely used and should be visible by default.  (Note that stack_t
    is *not* XSI-shaded and so the conditionals on that are correctly
    unchanged.)

    Tested for x86_64.

        [BZ #21584]
        * signal/signal.h: Make includes of <bits/sigstack.h> and
        <bits/ss_flags.h> conditional on [__USE_XOPEN_EXTENDED ||
        __USE_MISC].
        (sigaltstack): Make declaration conditional on
        [__USE_XOPEN_EXTENDED || __USE_MISC].

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

Summary of changes:
 ChangeLog       |    7 +++++++
 signal/signal.h |   10 ++++++----
 2 files changed, 13 insertions(+), 4 deletions(-)

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