On Wed, 30 Jan 2002, B. James Phillippe spamblock wrote:

: A co-worker of mine recently noticed that NetBSD does not define ENOTSUP
: (though it does define EOPNOTSUPP).  According to a quick net search, it
: appears that ENOTSUP and EOPNOTSUPP are actually two different error codes
: (Single UNIX Specifiction v2)*.  I'm curious to know what the BSD take on
: this is, since otherwise NetBSD seems quite conformant to the spec.

ENOTSUP is used by of the "Realtime Feature Group" of SUSv2, not currently
supported by NetBSD.  It is not the same as EOPNOTSUPP.

See the long description of ENOTSUP from the same URL you cited:

: * http://www.opengroup.org/onlinepubs/7908799/xsh/errors.html

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