1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2003 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #ifndef _SYS_LOGINDMUX_IMPL_H 28 #define _SYS_LOGINDMUX_IMPL_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include <sys/types.h> 33 #include <sys/stream.h> 34 35 #ifdef __cplusplus 36 extern "C" { 37 #endif 38 39 40 /* 41 * This structure is shared between two logindmux peer instances and 42 * ensures that only one of the peers will be actively processing an 43 * I_UNLINK ioctl at any one time. 44 */ 45 typedef struct unlinkinfo { 46 kmutex_t state_lock; /* serialize access to state */ 47 int state; /* state of I_UNLINK operation */ 48 mblk_t *prot_mp; /* carries protocol messages */ 49 } unlinkinfo_t; 50 51 /* 52 * Logindmux state structure; one per open instance. 53 */ 54 struct tmx { 55 queue_t *rdq; /* our mux upper read queue */ 56 queue_t *muxq; /* our mux lower write queue */ 57 queue_t *peerq; /* peer mux lower write queue */ 58 minor_t dev0; /* our minor device number */ 59 boolean_t isptm; /* true if ptm is downstream */ 60 mblk_t *unlink_mp; /* mblk used in logdmux_unlink_timer */ 61 unlinkinfo_t *unlinkinfop; /* used during I_UNLINK processing */ 62 bufcall_id_t wbufcid; /* needed for recovery */ 63 bufcall_id_t rbufcid; /* needed for recovery */ 64 timeout_id_t utimoutid; /* unlink timer identifier */ 65 timeout_id_t wtimoutid; /* needed for recovery */ 66 timeout_id_t rtimoutid; /* needed for recovery */ 67 }; 68 69 #define LOGDMX_ID 107 /* module id number */ 70 71 /* 72 * The arguments for calls to qtimeout, in microseconds. 73 */ 74 #define SIMWAIT 100000 /* logdmux_timer */ 75 #define LOGDMUX_POLL_WAIT 10 /* logdmux_unlink_timer */ 76 77 /* 78 * State of peer linkage. 79 */ 80 enum { 81 LOGDMUX_LINKED = 1, /* peer instances are in linked state */ 82 LOGDMUX_UNLINK_PENDING = 2, /* a peer is actively I_UNLINKing */ 83 LOGDMUX_UNLINKED = 3 /* a peer has completed its I_UNLINK */ 84 }; 85 86 /* 87 * Protocol message magic cookie. 88 */ 89 #define LOGDMUX_MCTL (LOGDMX_ID << 16) 90 91 /* 92 * peer to peer protocol messages. 93 */ 94 #define LOGDMUX_UNLINK_REQ (LOGDMUX_MCTL|1) /* peer wants to unlink */ 95 #define LOGDMUX_UNLINK_RESP (LOGDMUX_MCTL|2) /* ok for peer to unlink */ 96 97 /* 98 * Macro to determine if an mblk is a logindmux protocol mblk. 99 */ 100 #define LOGDMUX_PROTO_MBLK(mp) \ 101 ((DB_TYPE(mp) == M_CTL) && \ 102 ((mp)->b_cont != NULL) && \ 103 (DB_TYPE((mp)->b_cont) == M_IOCTL) && \ 104 (((struct iocblk *)((mp)->b_cont->b_rptr))->ioc_cmd == I_UNLINK)) 105 106 107 #ifdef __cplusplus 108 } 109 #endif 110 111 #endif /* _SYS_LOGINDMUX_IMPL_H */ 112