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 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 31 #ifndef _SYS_SESSION_H 32 #define _SYS_SESSION_H 33 34 #pragma ident "%Z%%M% %I% %E% SMI" 35 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 typedef struct sess { 41 uint_t s_ref; /* reference count */ 42 dev_t s_dev; /* tty's device number */ 43 struct vnode *s_vp; /* tty's vnode */ 44 struct pid *s_sidp; /* session ID info */ 45 struct cred *s_cred; /* allocation credentials */ 46 kmutex_t s_lock; /* sync s_vp use with freectty */ 47 kcondvar_t s_wait_cv; /* Condvar for sleeping */ 48 int s_cnt; /* # of active users of this session */ 49 int s_flag; /* session state flag see below */ 50 } sess_t; 51 52 #define SESS_CLOSE 1 /* session about to close */ 53 #define s_sid s_sidp->pid_id 54 55 #if defined(_KERNEL) 56 57 extern sess_t session0; 58 59 #define SESS_HOLD(sp) (++(sp)->s_ref) 60 #define SESS_RELE(sp) sess_rele(sp) 61 62 /* 63 * Used to synchronize session vnode users with freectty() 64 */ 65 66 #define TTY_HOLD(sp) { \ 67 mutex_enter(&(sp)->s_lock); \ 68 (++(sp)->s_cnt); \ 69 mutex_exit(&(sp)->s_lock); \ 70 } 71 72 #define TTY_RELE(sp) { \ 73 mutex_enter(&(sp)->s_lock); \ 74 if ((--(sp)->s_cnt) == 0) \ 75 cv_signal(&(sp)->s_wait_cv); \ 76 mutex_exit(&(sp)->s_lock); \ 77 } 78 79 /* forward referenced structure tags */ 80 struct vnode; 81 struct proc; 82 83 extern void sess_rele(sess_t *); 84 extern void sess_create(void); 85 extern void freectty(sess_t *); 86 extern void alloctty(struct proc *, struct vnode *); 87 extern dev_t cttydev(struct proc *); 88 89 #endif /* defined(_KERNEL) */ 90 91 #ifdef __cplusplus 92 } 93 #endif 94 95 #endif /* _SYS_SESSION_H */ 96