Content-type: text/html Man page of datab

datab

Section: Data Structures for Drivers (9S)
Updated: 24 Oct 2003
Index Return to Main Contents
 

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 references, 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


 

Index

NAME
SYNOPSIS
INTERFACE LEVEL
DESCRIPTION
STRUCTURE MEMBERS
SEE ALSO

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Time: 02:36:24 GMT, October 02, 2010