03-02-2008
Yes n its ma 1st project.
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msgb(9S) Data Structures for Drivers msgb(9S)
NAME
msgb, mblk - 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 consists 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)
Writing Device Drivers
STREAMS Programming Guide
SunOS 5.10 11 Apr 1991 msgb(9S)