[Bug libc/31430] New: glibc doesn't define MAP_UNINITIALIZED

["stefan.smorra at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31430

            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 exists
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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