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
, long val);

ARGUMENTS

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. 

INTERFACE LEVEL

Architecture independent level 1 (DDI/DKI). 

DESCRIPTION

strqset() 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

strqset() can be called from user or interrupt context. 

SEE ALSO

freezestr(9F), queue(9S), strqget(9F), unfreezestr(9F)

SunOS 5.3 Writing Device Drivers
SunOS 5.3 STREAMS Programmer’s Guide

NOTES

The stream must be frozen using freezestr(9F) before calling strqset().

To set the values of QMINPSZ and QMAXPSZ from within a single call to freezestr(9F)/unfreezestr(9F): when lowering the existing values, set QMINPSZ before setting QMAXPSZ; when raising the existing values, set QMAXPSZ before setting QMINPSZ. 

Sun Microsystems  —  Last change: 28 Jan 1993