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'\" te .\" Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved. .\" Copyright (c) 1989, AT&T. All rights reserved. .TH msgb 9S "11 Apr 1991" "Oracle Solaris 11.4" "Kernel & Driver Data Structures" .SH NAME msgb, mblk \- STREAMS message block structure .SH SYNOPSIS .LP .nf #include <sys/stream.h> .fi .SH INTERFACE LEVEL .sp .LP Architecture independent level 1 (DDI/DKI) .SH DESCRIPTION .sp .LP A STREAMS message is made up of one or more message blocks, referenced by a pointer to a \fBmsgb\fR structure. The \fBb_next\fR and \fBb_prev\fR pointers are used to link messages together on a \fBQUEUE\fR. The \fBb_cont\fR pointer links message blocks together when a message consists of more than one block. .sp .LP Each \fBmsgb\fR structure also includes a pointer to a \fBdatab\fR(9S) structure, the data block (which contains pointers to the actual data of the message), and the type of the message. .SH STRUCTURE MEMBERS .sp .in +2 .nf 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 */ .fi .in -2 .sp .sp .LP Valid flags are as follows: .sp .ne 2 .mk .na \fB\fBMSGMARK\fR \fR .ad .RS 12n .rt Last byte of message is marked. .RE .sp .ne 2 .mk .na \fB\fBMSGDELIM\fR \fR .ad .RS 12n .rt Message is delimited. .RE .sp .LP The \fBmsgb\fR structure is defined as type \fBmblk_t\fR. .SH SEE ALSO .sp .LP \fBdatab\fR(9S) .sp .LP \fIWriting Device Drivers in Oracle Solaris 11.4\fR .sp .LP \fISTREAMS Programming Guide\fR