man/man9f/qassociate.9f

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 QASSOCIATE 9F "Feb 01, 2007"
 NAME
qassociate - associate STREAMS queue with driver instance
 SYNOPSIS
#include <sys/types.h>
#include <sys/stream.h>
#include <sys/stropts.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>

int qassociate(queue_t *q, int instance


 INTERFACE LEVEL
illumos DDI specific (illumos DDI).
 PARAMETERS
queue_t *q

Pointer to a queue(9S) structure. Either the read or write queue can be
used.


int instance

Driver instance number or -1.


 DESCRIPTION
The qassociate() function must be used by DLPI style 2 device
drivers to manage the association between STREAMS queues and device instances.
The gld(4D) does this automatically on behalf of drivers based on it. It
is recommended that the gld(4D) be used for network device drivers
whenever possible.

The qassociate() function associates the specified STREAMS queue with the
specified instance of the bottom driver in the queue. Upon successful return,
the stream is associated with the instance with any prior association
dissolved.

A DLPI style 2 driver calls qassociate() while processing the
DL_ATTACH_REQ message. The driver is also expected to call this interface
while performing stream associations through other means, such as ndd(8)
ioctl commands.

If instance is -1, the stream is left unassociated with any hardware
instance.

If the interface returns failure, the stream is not associated with the
specified instance. Any prior association is left untouched.

The interface typically fails because of failure to locate and attach the
device instance. The interface never fails if the specified instance is -1.
 CONTEXT
The qassociate() function can be called from the stream's put(9E)
entry point.
 RETURN VALUES
0

Success.


-1

Failure.


 EXAMPLES
DLPI style 2 network driver DL_ATTACH_REQ code specifies:
if (qassociate(q, instance) != 0)
 goto fail;


The association prevents Dynamic Reconfiguration (DR) from detaching the
instance.

DLPI style 2 network driver DL_DETACH code specifies:
(void) qassociate(q, -1);


This dissolves the queue's association with any device instance.

DLPI style 2 network driver open(9E) code must call:
qassociate(q, -1);


This informs the framework that this driver has been modified to be
DDI-compliant.
 SEE ALSO
 gld (4D),  dlpi (4P),  open (9E),  put (9E),  ddi_no_info (9F),  queue (9S)