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Date:      Sun, 29 Jun 2014 22:11:31 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 190912] [libc] shmctl(2) get shared memory state returning error attached process number
Message-ID:  <bug-190912-8-tSZLhw02qX@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-190912-8@https.bugs.freebsd.org/bugzilla/>
References:  <bug-190912-8@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=190912

Jilles Tjoelker <jilles@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|Needs Triage                |In Discussion
                 CC|                            |jilles@FreeBSD.org

--- Comment #2 from Jilles Tjoelker <jilles@FreeBSD.org> ---
When called through the FreeBSD ABI, shmctl(SHM_STAT) will always fail with
[EINVAL]. The SHM_STAT cmd is really only intended for Linux's ipcs tool,
allowing it to iterate over all shared memory segments in the system. It is
probably a bug that the <sys/shm.h> header exposes SHM_STAT and a few other
unsupported cmd values to applications.

To request the state of a shared memory segment, use IPC_STAT.

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