[Bug 190912] [libc] shmctl(2) get shared memory state returning error attached process number

[bugzilla-noreply at freebsd.org]

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

Jilles Tjoelker <jilles at FreeBSD.org> changed:

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

--- Comment #2 from Jilles Tjoelker <jilles at 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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