Incorrect range specified in mq_send(3c) manual
mq_send(3c) page specifies that the
msg_prio must range from 1 to
MQ_PRIO_MAX. This is incorrect, both according to POSIX and the mqueue code. The correct range is 0 to
MQ_PRIO_MAX - 1.
I have a patch ready and will send to the mailing list today.