[Go to CFHT Home Page] Man Pages
Back to Software Index  BORDER=0Manpage Top Level
    datab(9S) manual page Table of Contents

Name

datab - 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.

A data block can have more than one message block pointing to it at one time, so 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 chardb_ref;/* # of message pointers to this data */
unsigned chardb_type;/* message type */

A datab structure is defined as type dblk_t.

See Also

free_rtn(9S) , msgb(9S)

Table of Contents