STRQSET(9F) Kernel Functions for Drivers STRQSET(9F)

NAME


strqset - change information about a queue or band of the queue

SYNOPSIS


#include <sys/stream.h>


int strqset(queue_t *q, qfields_t what, unsigned char pri, intptr_t val);


INTERFACE LEVEL


Architecture independent level 1 (DDI/DKI).

PARAMETERS


q
Pointer to the queue.


what
Field of the queue structure (or the specified priority band) to
return information about. Valid values are one of:

QHIWAT
High water mark.


QLOWAT
Low water mark.


QMAXPSZ
Largest packet accepted.


QMINPSZ
Smallest packet accepted.


pri
Priority band of interest.


val
The value for the field to be changed.


DESCRIPTION


The strqset() function gives drivers and modules a way to change
information about a queue or a particular band of a queue without
directly accessing STREAMS data structures.

RETURN VALUES


On success, 0 is returned. EINVAL is returned if an undefined attribute
is specified.

CONTEXT


The strqset() function can be called from user, interrupt, or kernel
context.

SEE ALSO


strqget(9F), queue(9S)


Writing Device Drivers


STREAMS Programming Guide

NOTES


When lowering existing values, set QMINPSZ before setting QMAXPSZ; when
raising existing values, set QMAXPSZ before setting QMINPSZ.

illumos January 16, 2006 STRQSET(9F)