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

mcopyin - Convert an M_IOCTL or M_IOCDATA message to an M_COPYIN

#include <sys/stream.h>
#include <sys/strsun.h>
void mcopyin(mblk_t *mp, void *private, size_t size,
     void * useraddr);

illumos DDI specific (illumos DDI).

M_IOCTL or M_IOCDATA message.


Value to which the cq_private field of copyreq(9S) is set.


Value to which the cq_size field of copyreq(9S) is set.


Optionally, the value to which the cq_addr field of copyreq(9S) is set.

The mcopyin() function converts an M_IOCTL or M_IOCDATA message into an M_COPYIN message using the supplied arguments.

To convert the message, mcopyin() changes the message type to M_COPYIN, and its payload from a iocblk(9S) to a copyreq(9S). Since the iocblk(9S) and copyreq(9S) are designed to overlay one another, the only fields which must be updated are cq_private, cq_size, and cq_addr, which are set to the supplied values. If useraddr is passed as NULL, mp must be a transparent M_IOCTL, and cq_addr is assigned the pointer-sized quantity found at mp->b_cont->b_rptr.

Any trailing message blocks associated with mp are freed.


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

mcopyout(9F), copyreq(9S)

STREAMS Programming Guide

June 9, 2004 OmniOS