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Manual page for msgb(9S)

msgb - STREAMS message block structure

SYNOPSIS

#include <sys/stream.h>

INTERFACE LEVEL

Architecture independent level 1 (DDI/DKI).

DESCRIPTION

A STREAMS message is made up of one or more message blocks, referenced by a pointer to a msgb structure. The b_next and b_prev pointers are used to link messages together on a QUEUE. The b_cont pointer links message blocks together when a message is composed of more than one block.

Each msgb structure also includes a pointer to a datab.9s structure, the data block (which contains pointers to the actual data of the message), and the type of the message.

STRUCTURE MEMBERS

struct msgb     *b_next;   /* next message on queue */
struct msgb     *b_prev;   /* previous message on queue */
struct msgb     *b_cont;   /* next message block */
unsigned char   *b_rptr;   /* 1st unread data byte of buffer */
unsigned char   *b_wptr;   /* 1st unwritten data byte of buffer */
struct datab    *b_datap;  /* pointer to data block */
unsigned char   b_band;    /* message priority  */
unsigned short  b_flag;    /* used by stream head  */

Valid flags are as follows:

MSGMARK
last byte of message is "marked".
MSGDELIM
message is delimited.

The msgb structure is defined as type mblk_t.

SEE ALSO

datab.9s

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Created by unroff & hp-tools. © by Hans-Peter Bischof. All Rights Reserved (1997).

Last modified 21/April/97