'\" te
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.TH qband 9S "14 Nov 1996" "SunOS 5.11" "Data Structures for Drivers"
.SH NAME
qband \- STREAMS queue flow control information 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
The  \fBqband\fR structure contains flow control information for each priority
band in a queue.
.sp
.LP
The \fBqband\fR structure is defined as type \fBqband_t\fR.
.SH STRUCTURE MEMBERS
.sp
.in +2
.nf
struct        qband*qb_next;     /* next band's info */
size_t        qb_count           /* number of bytes in band */
struct msgb   *qb_first;         /* start of band's data */
struct msgb   *qb_last;          /* end of band's data */
size_t        qb_hiwat;          /* band's high water mark */
size_t        qb_lowat;          /* band's low water mark */
uint_t        qb_flag;           /* see below */
.fi
.in -2

.sp
.LP
Valid flags are as follows:
.sp
.ne 2
.mk
.na
\fB\fBQB_FULL\fR \fR
.ad
.RS 13n
.rt  
Band is considered full.
.RE

.sp
.ne 2
.mk
.na
\fB\fBQB_WANTW\fR \fR
.ad
.RS 13n
.rt  
Someone wants to write to band.
.RE

.SH SEE ALSO
.sp
.LP
\fBstrqget\fR(9F), \fBstrqset\fR(9F), \fBmsgb\fR(9S), \fBqueue\fR(9S)
.sp
.LP
\fISTREAMS Programming Guide\fR
.SH NOTES
.sp
.LP
All access to this structure should be through \fBstrqget\fR(9F) and
\fBstrqset\fR(9F). It is logically part of the \fBqueue\fR(9S) and its layout
and partitioning with respect to that structure might change in future
releases. If portability is a concern, do not declare or store instances of or
references to this structure.