opensolaris man page for datab

datab(9S)						    Data Structures for Drivers 						 datab(9S)

NAME
       datab, dblk - STREAMS message data structure

SYNOPSIS
       #include <sys/stream.h>

INTERFACE LEVEL
       Architecture independent level 1 (DDI/DKI).

DESCRIPTION
       The  datab  structure  describes  the  data of a STREAMS message. The actual data contained in a STREAMS message is stored in a data buffer
       pointed to by this structure. A	msgb (message block) structure includes a field that points to a datab structure.

       Because a data block can have more than one message block pointing to it at one time, the db_ref member keeps track of a data block's  ref-
       erences, preventing it from being deallocated until all message blocks are finished with it.

STRUCTURE MEMBERS
	 unsigned char	   *db_base;	 /* first byte of buffer */
	 unsigned char	   *db_lim;	 /* last byte (+1) of buffer */
	 unsigned char	    db_ref;	 /* # of message pointers to this data */
	 unsigned char	    db_type;	 /* message type */

       A datab structure is defined as type dblk_t.

SEE ALSO
       free_rtn(9S), msgb(9S)

       Writing Device Drivers

       STREAMS Programming Guide

SunOS 5.11							    24 Oct 2003 							 datab(9S)