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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Redirection STREAMS module.
*
* This module is intended for use in conjunction with instantiations of the
* redirection driver. Its purpose in life is to detect when the stream that
* it's pushed on is closed, thereupon calling back into the redirection
* driver so that the driver can cancel redirection to the stream.
* It passes all messages on unchanged, in both directions.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/stream.h>
#include <sys/stropts.h>
#include <sys/debug.h>
#include <sys/strredir.h>
#include <sys/strsubr.h>
#include <sys/strsun.h>
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/modctl.h>
/*
* Forward declarations for private routines.
*/
static int wcmopen(queue_t *, dev_t *, int, int, cred_t *);
static int wcmclose(queue_t *, int, cred_t *);
static int wcmrput(queue_t *, mblk_t *);
static int wcmwput(queue_t *, mblk_t *);
static struct module_info wcminfo = {
STRREDIR_MODID,
STRREDIR_MOD,
0,
INFPSZ,
5120,
1024
};
static struct qinit wcmrinit = {
wcmrput, /* put */
NULL, /* service */
wcmopen, /* open */
wcmclose, /* close */
NULL, /* qadmin */
&wcminfo,
NULL /* mstat */
};
static struct qinit wcmwinit = {
wcmwput, /* put */
NULL, /* service */
wcmopen, /* open */
wcmclose, /* close */
NULL, /* qadmin */
&wcminfo,
NULL /* mstat */
};
static struct streamtab redirminfo = {
&wcmrinit,
&wcmwinit,
NULL,
NULL
};
static struct fmodsw fsw = {
"redirmod",
&redirminfo,
D_MP
};
static struct modlstrmod modlstrmod = {
&mod_strmodops,
"redirection module",
&fsw
};
static struct modlinkage modlinkage = {
MODREV_1, &modlstrmod, NULL
};
int
_init()
{
return (mod_install(&modlinkage));
}
int
_fini()
{
return (EBUSY);
}
int
_info(struct modinfo *modinfop)
{
return (mod_info(&modlinkage, modinfop));
}
/* ARGSUSED */
static int
wcmopen(queue_t *q, dev_t *dev, int flag, int sflag, cred_t *cred)
{
if (sflag != MODOPEN)
return (EINVAL);
qprocson(q);
return (0);
}
/* ARGSUSED */
static int
wcmclose(queue_t *q, int flag, cred_t *cred)
{
qprocsoff(q);
srpop(q->q_stream->sd_vnode, B_TRUE);
return (0);
}
/*
* Upstream messages are passed unchanged.
* If a hangup occurs the target is no longer usable, so deprecate it.
*/
static int
wcmrput(queue_t *q, mblk_t *mp)
{
if (DB_TYPE(mp) == M_HANGUP)
/* Don't block waiting for outstanding operations to complete */
srpop(q->q_stream->sd_vnode, B_FALSE);
putnext(q, mp);
return (0);
}
static int
wcmwput(queue_t *q, mblk_t *mp)
{
putnext(q, mp);
return (0);
}
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