DB_BASE(9F)						   Kernel Functions for Drivers 					       DB_BASE(9F)

NAME

       DB_BASE, DB_LIM, DB_REF, DB_TYPE - Data block access macros

SYNOPSIS

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

       uchar_t *DB_BASE(mblk_t *mp);

       uchar_t *DB_LIM(mblk_t *mp);

       uchar_t DB_TYPE(mblk_t *mp);

       uchar_t DB_REF(mblk_t *mp);

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI).

PARAMETERS

       mp	       Message block to be accessed.

DESCRIPTION

       These macros provide compact access to public members of the datab(9S) structure associated with the specified message block.

       In  all	cases, these macros are equivalent to directly accessing the underlying fields of the datab(9S) associated with the specified mes-
       sage block. Specifically:

       DB_BASE(mp) is equivalent to mp->b_datap->db_base.

       DB_LIM(mp) is equivalent to mp->b_datap->db_lim.

       DB_TYPE(mp) is equivalent to mp->b_datap->db_type.

       DB_REF(mp) is equivalent to mp->b_datap->db_ref.

CONTEXT

       These functions can be called from user, kernel or interrupt context.

SEE ALSO

       msgb(9S), datab(9S)

       STREAMS Programming Guide

SunOS 5.10							    9 June 2004 						       DB_BASE(9F)