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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). wq mp count rval 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).

None. 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