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mcopyin - Convert an M_IOCTL or M_IOCDATA message to an M_COPYIN

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



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

illumos DDI specific (illumos DDI). mp private size useraddr 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.

None. This function can be called from user, kernel or interrupt context. mcopyout (9F), copyreq (9S)

STREAMS Programming Guide