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

NAME

mcopyin - Convert an M_IOCTL or M_IOCDATA message to an M_COPYIN

SYNOPSIS

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


void mcopyin(mblk_t *mp, void *private, size_t size,
void * useraddr);

INTERFACE LEVEL

illumos DDI specific (illumos DDI).

PARAMETERS

mp
M_IOCTL or M_IOCDATA message.


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


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


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

DESCRIPTION

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.

RETURN VALUES

None.

CONTEXT

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

SEE ALSO

mcopyout(9F), copyreq(9S)


STREAMS Programming Guide

June 9, 2004 MCOPYIN(9F)