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 #include <sys/types.h> 31 #include <sys/stream.h> 32 33 #ifdef __cplusplus 34 extern "C" { 35 #endif 36 37 38 /* 39 * This structure is shared between two logindmux peer instances and 40 * ensures that only one of the peers will be actively processing an 41 * I_UNLINK ioctl at any one time. 42 */ 43 typedef struct unlinkinfo { 44 kmutex_t state_lock; /* serialize access to state */ 45 int state; /* state of I_UNLINK operation */ 46 mblk_t *prot_mp; /* carries protocol messages */ 47 } unlinkinfo_t; 48 49 /* 50 * Logindmux state structure; one per open instance. 51 */ 52 struct tmx { 53 queue_t *rdq; /* our mux upper read queue */ 54 queue_t *muxq; /* our mux lower write queue */ 55 queue_t *peerq; /* peer mux lower write queue */ 56 minor_t dev0; /* our minor device number */ 57 boolean_t isptm; /* true if ptm is downstream */ 58 mblk_t *unlink_mp; /* mblk used in logdmux_unlink_timer */ 59 unlinkinfo_t *unlinkinfop; /* used during I_UNLINK processing */ 60 bufcall_id_t wbufcid; /* needed for recovery */ 61 bufcall_id_t rbufcid; /* needed for recovery */ 62 timeout_id_t utimoutid; /* unlink timer identifier */ 63 timeout_id_t wtimoutid; /* needed for recovery */ 64 timeout_id_t rtimoutid; /* needed for recovery */ 65 }; 66 67 #define LOGDMX_ID 107 /* module id number */ 68 69 /* 70 * The arguments for calls to qtimeout, in microseconds. 71 */ 72 #define SIMWAIT 100000 /* logdmux_timer */ 73 #define LOGDMUX_POLL_WAIT 10 /* logdmux_unlink_timer */ 74 75 /* 76 * State of peer linkage. 77 */ 78 enum { 79 LOGDMUX_LINKED = 1, /* peer instances are in linked state */ 80 LOGDMUX_UNLINK_PENDING = 2, /* a peer is actively I_UNLINKing */ 81 LOGDMUX_UNLINKED = 3 /* a peer has completed its I_UNLINK */ 82 }; 83 84 /* 85 * Protocol message magic cookie. 86 */ 87 #define LOGDMUX_MCTL (LOGDMX_ID << 16) 88 89 /* 90 * peer to peer protocol messages. 91 */ 92 #define LOGDMUX_UNLINK_REQ (LOGDMUX_MCTL|1) /* peer wants to unlink */ 93 #define LOGDMUX_UNLINK_RESP (LOGDMUX_MCTL|2) /* ok for peer to unlink */ 94 95 /* 96 * Macro to determine if an mblk is a logindmux protocol mblk. 97 */ 98 #define LOGDMUX_PROTO_MBLK(mp) \ 99 ((DB_TYPE(mp) == M_CTL) && \ 100 ((mp)->b_cont != NULL) && \ 101 (DB_TYPE((mp)->b_cont) == M_IOCTL) && \ 102 (((struct iocblk *)((mp)->b_cont->b_rptr))->ioc_cmd == I_UNLINK)) 103 104 105 #ifdef __cplusplus 106 } 107 #endif 108 109 #endif /* _SYS_LOGINDMUX_IMPL_H */ 110