qassociate(9F) Kernel Functions for Drivers qassociate(9F)NAMEqassociate - 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
Solaris DDI specific (Solaris DDI). This entry point is required for
drivers which export cb_ops(9S) entry points.
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 associates the specified STREAMS queue with
the specified instance of the bottom driver in the queue. Upon success‐
ful 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 inter‐
face while performing stream associations through other means, such as
ndd(1M) 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.
CONTEXTqassociate() can be called from the stream's put(9E) entry point.
RETURN VALUES
0
Success.
-1
Failure.
EXAMPLES
A Style-2 network driver's DL_ATTACH_REQ code would specify:
if (qassociate(q, instance) != 0)
goto fail;
The association prevents Dynamic Reconfiguration (DR) from detaching
the instance.
A Style-2 network driver's DL_DETACH code would specify:
(void) qassociate(q, -1);
This dissolves the queue's association with any device instance.
A Style-2 network driver's open(9E) code must call:
qassociate(q, -1);
This informs the framework that this driver has been modified to be
DDI-compliant.
SEE ALSOdlpi(7P), open(9E), put(9E), ddi_no_info(9F), queue(9S)SunOS 5.10 9 Jul 2002 qassociate(9F)
