man/man9f/mcopyout.9f

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 MCOPYOUT 9F "Jun 9, 2004"
 NAME
mcopyout - Convert an M_IOCTL or M_IOCDATA message to an M_COPYOUT
 SYNOPSIS

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


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


 INTERFACE LEVEL

Solaris DDI specific (Solaris DDI).
 PARAMETERS
mp

M_IOCTL or M_IOCDATA message.


private

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


size

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


useraddr

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


dp

Optionally, the payload to copy out.


 DESCRIPTION

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

To convert the message, mcopyout() changes the message type to M_COPYOUT,
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, the M_IOCTL must be transparent and cq_addr is assigned
the pointer-sized quantity found at mp->b_cont->b_rptr.

If dp is not NULL, any trailing message blocks associated with mp
are freed, mp->b_cont is reset to dp and dp->b_wptr is set to
dp->b_rptr + size. Otherwise, any trailing message blocks are unaffected.
 RETURN VALUES

None.
 CONTEXT

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

mcopyin(9F), copyreq(9S), iocblk(9S)

STREAMS Programming Guide