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

miocack - Positively acknowledge an M_IOCTL message

#include <sys/stream.h>
#include <sys/strsun.h>
void miocack(queue_t *wq, mblk_t *mp, intcount, int rval);

illumos DDI specific (illumos DDI).

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


M_IOCTL message.


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


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

The miocack() function converts an M_IOCTL message into a M_IOCACK message and sends the resulting message upstream.

To convert the message, miocack() changes the message type to M_IOCACK, sets the 'ioc_count' and 'ioc_rval' members of the iocblk(9S) associated with mp to the passed-in values, and clears the 'ioc_error' field. If the caller specifies a non-zero value for count, it is expected that the caller has already set 'mp->b_cont' field to point to a message block with a length of at least count bytes.

Callers that only need to perform the message conversion, or need to perform additional steps between the conversion and the sending of the M_IOCACK should use mioc2ack(9F).


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

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

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

STREAMS Programming Guide

June 9, 2004 OmniOS