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From: "stefan.smorra at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/31430] New: glibc doesn't define MAP_UNINITIALIZED
Date: Wed, 28 Feb 2024 17:59:11 +0000
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: libc
X-Bugzilla-Version: 2.39
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X-Bugzilla-Severity: minor
X-Bugzilla-Who: stefan.smorra at gmail dot com
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31430

            Bug ID: 31430
           Summary: glibc doesn't define MAP_UNINITIALIZED
           Product: glibc
           Version: 2.39
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: stefan.smorra at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

When you look into Linux 'man mmap' you'll find MAP_UNINITIALIZED which exi=
sts
for roughly 14 years (in the Linux kernel).

However when I include sys/mman.h it says MAP_UNINITIALIZED is undeclared.

I am not 100% sure if this is a bug in glibc or intention.

I searched the web, mailing lists, stackoverflow and the glibc source code =
and
found nothing about why this macro is undefined in glibc.

The only comment about this flag is in tst-mman-consts.py. It says
MAP_UNINITIALIZED is kernel only. Does that mean glibc doesn't support Linux
only features? I am not sure.

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