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)