man pages section 9: DDI and DKI Kernel Functions

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Updated: July 2014
 
 

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

Solaris DDI specific (Solaris 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