MIOC2ACK(9F) Kernel Functions for Drivers MIOC2ACK(9F)

NAME

mioc2ack - Convert an M_IOCTL message to an M_IOCACK message

SYNOPSIS

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


void mioc2ack(mblk_t *mp, mblk_t *dp, size_t count, int rval);

INTERFACE LEVEL

illumos DDI specific (illumos DDI).

PARAMETERS

mp
M_IOCTL message.


dp
Payload to associate with M_IOCACK 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 mioc2ack() function converts an M_IOCTL message into an M_IOCACK
message using the supplied arguments.


To convert the message, mioc2ack() 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. Further, it frees any message blocks chained off of mp->b_cont
and resets mp->b_cont to dp. Finally, if dp is not NULL, mioc2ack()
resets dp->b_wptr to be dp->b_rptr + count (that is, it sets dp to be
exactly count bytes in length).

RETURN VALUES

None.

CONTEXT

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

SEE ALSO

miocack(9F), miocnak(9F), iocblk(9S)


STREAMS Programming Guide

June 9, 2004 MIOC2ACK(9F)