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

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, void *valp);

INTERFACE LEVEL

Architecture independent level 1 (DDI/DKI).

PARAMETERS

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.

DESCRIPTION

The strqget() function 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

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

SEE ALSO

strqset(9F), queue(9S)


Writing Device Drivers


STREAMS Programming Guide

January 16, 2006 STRQGET(9F)