logindmux_impl.h revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (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 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_LOGINDMUX_IMPL_H
#define _SYS_LOGINDMUX_IMPL_H
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/stream.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* This structure is shared between two logindmux peer instances and
* ensures that only one of the peers will be actively processing an
* I_UNLINK ioctl at any one time.
*/
typedef struct unlinkinfo {
kmutex_t state_lock; /* serialize access to state */
int state; /* state of I_UNLINK operation */
mblk_t *prot_mp; /* carries protocol messages */
} unlinkinfo_t;
/*
* Logindmux state structure; one per open instance.
*/
struct tmx {
queue_t *rdq; /* our mux upper read queue */
queue_t *muxq; /* our mux lower write queue */
queue_t *peerq; /* peer mux lower write queue */
minor_t dev0; /* our minor device number */
boolean_t isptm; /* true if ptm is downstream */
mblk_t *unlink_mp; /* mblk used in logdmux_unlink_timer */
unlinkinfo_t *unlinkinfop; /* used during I_UNLINK processing */
bufcall_id_t wbufcid; /* needed for recovery */
bufcall_id_t rbufcid; /* needed for recovery */
timeout_id_t utimoutid; /* unlink timer identifier */
timeout_id_t wtimoutid; /* needed for recovery */
timeout_id_t rtimoutid; /* needed for recovery */
};
#define LOGDMX_ID 107 /* module id number */
/*
* The arguments for calls to qtimeout, in microseconds.
*/
#define SIMWAIT 100000 /* logdmux_timer */
#define LOGDMUX_POLL_WAIT 10 /* logdmux_unlink_timer */
/*
* State of peer linkage.
*/
enum {
LOGDMUX_LINKED = 1, /* peer instances are in linked state */
LOGDMUX_UNLINK_PENDING = 2, /* a peer is actively I_UNLINKing */
LOGDMUX_UNLINKED = 3 /* a peer has completed its I_UNLINK */
};
/*
* Protocol message magic cookie.
*/
#define LOGDMUX_MCTL (LOGDMX_ID << 16)
/*
* peer to peer protocol messages.
*/
#define LOGDMUX_UNLINK_REQ (LOGDMUX_MCTL|1) /* peer wants to unlink */
#define LOGDMUX_UNLINK_RESP (LOGDMUX_MCTL|2) /* ok for peer to unlink */
/*
* Macro to determine if an mblk is a logindmux protocol mblk.
*/
#define LOGDMUX_PROTO_MBLK(mp) \
((DB_TYPE(mp) == M_CTL) && \
((mp)->b_cont != NULL) && \
(DB_TYPE((mp)->b_cont) == M_IOCTL) && \
(((struct iocblk *)((mp)->b_cont->b_rptr))->ioc_cmd == I_UNLINK))
#ifdef __cplusplus
}
#endif
#endif /* _SYS_LOGINDMUX_IMPL_H */