MCOPYOUT(9F)MCOPYOUT(9F)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 copy‐
req(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_COPY‐
OUT, 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 ALSOmcopyin(9F), copyreq(9S), iocblk(9S)
STREAMS Programming Guide
Jun 9, 2004 MCOPYOUT(9F)