man/man9f/miocack.9f

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 miocack 9F "9 June 2004" "SunOS 5.11" "Kernel Functions for Drivers"
 NAME
miocack - Positively acknowledge an M_IOCTL message
 SYNOPSIS

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


void miocack(queue_t *wq, mblk_t *mp, intcount, int rval);


 INTERFACE LEVEL

Solaris DDI specific (Solaris DDI).
 PARAMETERS

wq

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


mp

M_IOCTL message.


count

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


rval

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


 DESCRIPTION

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).
 RETURN VALUES

None.
 CONTEXT

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

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

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

STREAMS Programming Guide