I wrote:
> it appears from your report that OS X is also using ENOMEM when SHMALL
> is exceeded, which is not all that surprising because actually none of
> the spec-defined error codes cover SHMALL exhaustion.

A look into
http://www.opensource.apple.com/source/xnu/xnu-1504.7.4/bsd/kern/sysv_shm.c
confirms this:

        if ((user_ssize_t)(shm_committed + btoc(total_size)) > shminfo.shmall)
                return ENOMEM;

So this behavior is probably common among BSDen.

                        regards, tom lane

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