Content-type: text/html Man page of mcopyout

mcopyout

Section: Kernel Functions for Drivers (9F)
Updated: 9 June 2004
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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


 

Index

NAME
SYNOPSIS
INTERFACE LEVEL
PARAMETERS
DESCRIPTION
RETURN VALUES
CONTEXT
SEE ALSO

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Time: 02:39:46 GMT, October 02, 2010