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Subject: [Bug 206927] Bad semaphore return code on collision
Date: Sun, 07 Feb 2016 21:22:29 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D206927

Jilles Tjoelker <jilles@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|freebsd-bugs@FreeBSD.org    |jilles@FreeBSD.org
             Status|New                         |In Progress
                 CC|                            |jilles@FreeBSD.org

--- Comment #1 from Jilles Tjoelker <jilles@FreeBSD.org> ---
The additional [EINVAL] condition is missing from the semget(2) man page; I
will add it.

Although POSIX leaves the detection order of errors undefined (XSH 2.3 Error
Numbers), detecting [EINVAL] before [EEXIST] is clearly inconvenient for
applications. The inconvenient order has been in place for years, but it is
easy to change.

You could request the Austin Group to make this unambiguous (e.g., restrict
part of the [EINVAL] error to not occur if
((semflg&IPC_CREAT)&&(segflg&IPC_EXCL)) is non-zero).

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