man/man9f/miocnak.9f

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 miocnak 9F "9 June 2004" "SunOS 5.11" "Kernel Functions for Drivers"
 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

Solaris DDI specific (Solaris 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

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

STREAMS Programming Guide