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

NAME

miocnak - Negatively acknowledge an M_IOCTL message

SYNOPSIS

#include <sys/stream.h>
#include <sys/strsun.h>


void miocnak(queue_t *wq, mblk_t *mp, int count, int error);

INTERFACE LEVEL

illumos DDI specific (illumos DDI).

PARAMETERS

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


mp
M_IOCTL message.


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


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

DESCRIPTION

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.

RETURN VALUES

None.

CONTEXT

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

NOTES

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

SEE ALSO

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


STREAMS Programming Guide

June 9, 2004 MIOCNAK(9F)