MIOCNAK(9F) Kernel Functions for Drivers MIOCNAK(9F)

miocnak - Negatively acknowledge an M_IOCTL message

#include <sys/stream.h>
#include <sys/strsun.h>
void miocnak(queue_t *wq, mblk_t *mp, int count, int error);

illumos DDI specific (illumos DDI).

Write queue associated with the read queue to send the M_IOCNAK on.


M_IOCTL message.


Value to set the ioc_count of the iocblk(9S) to.


Value to set the ioc_error of the iocblk(9S) to.

The miocnak() function converts an M_IOCTL message into an M_IOCNAK message and sends the resulting message upstream.

To convert the message, miocnak() changes the message type to M_IOCNAK, sets the ioc_count and ioc_error members of the iocblk(9S) associated with mp to the passed-in values, and clears the ioc_rval field. Since payloads cannot currently be associated with M_IOCNAK messages, count must always be zero. If error is passed as zero, EINVAL is assumed.


This function can be called from user, kernel or interrupt context.

Callers must not hold any locks across a miocnak() that can be acquired as part of put(9E) processing.

put(9E), mioc2ack(9F), miocack(9F), iocblk(9S)

STREAMS Programming Guide

June 9, 2004 OmniOS