NAME

strqget − get information about a queue or band of the queue

SYNOPSIS

#include <sys/stream.h>
int strqget(queue_t ∗q, qfields_t what, unsigned char pri
, long ∗valp);

ARGUMENTS

q Pointer to the queue. 

what Field of the queue structure for (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. 

QCOUNT Approximate size (in bytes) of data. 

QFIRST First message. 

QLAST Last message. 

QFLAG Status. 

pri Priority band of interest. 

valp The address of where to store the value of the requested field. 

INTERFACE LEVEL

Architecture independent level 1 (DDI/DKI). 

DESCRIPTION

strqget() gives drivers and modules a way to get information about a queue or a particular band of a queue without directly accessing STREAMS data structures, thus insulating them from changes in the implementation of these data structures from release to release. 

RETURN VALUES

On success, 0 is returned and the value of the requested field is stored in the location pointed to by valp. An error number is returned on failure.

CONTEXT

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

SEE ALSO

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

Writing Device Drivers
STREAMS Programming Guide

NOTES

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

SunOS 5.5/SPARC  —  Last change: 28 Jan 1993