1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 23*0Sstevel@tonic-gate /* All Rights Reserved */ 24*0Sstevel@tonic-gate 25*0Sstevel@tonic-gate 26*0Sstevel@tonic-gate #ifndef _SYS_OPEN_H 27*0Sstevel@tonic-gate #define _SYS_OPEN_H 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" /* from SVR4 11.4 */ 30*0Sstevel@tonic-gate 31*0Sstevel@tonic-gate #ifdef __cplusplus 32*0Sstevel@tonic-gate extern "C" { 33*0Sstevel@tonic-gate #endif 34*0Sstevel@tonic-gate 35*0Sstevel@tonic-gate /* 36*0Sstevel@tonic-gate * Some drivers need to be able to keep accurate records of open/close 37*0Sstevel@tonic-gate * calls to determine whether a device is still in use. To allow this 38*0Sstevel@tonic-gate * open/close calls have been typed and the type is passed as a third 39*0Sstevel@tonic-gate * argument in open/close calls, as in: 40*0Sstevel@tonic-gate * (*cdevsw[getmajor(dev)].d_open)(getminor(dev), flag, OTYP_CHR); 41*0Sstevel@tonic-gate * or 42*0Sstevel@tonic-gate * (*cdevsw[getmajor(dev)].d_close)(getminor(dev), flag, OTYP_CHR); 43*0Sstevel@tonic-gate * Five types of open/close calls have been defined: 44*0Sstevel@tonic-gate * OTYP_BLK: open/close of a block special file 45*0Sstevel@tonic-gate * OTYP_MNT: open/close for mounting/unmounting a file system 46*0Sstevel@tonic-gate * OTYP_CHR: open/close of a character special file 47*0Sstevel@tonic-gate * OTYP_SWP: open/close of a swapping device. 48*0Sstevel@tonic-gate * OTYP_LYR: open/close calls from a driver to another driver, 49*0Sstevel@tonic-gate * without a file being open for the dev of the lower driver. 50*0Sstevel@tonic-gate * 51*0Sstevel@tonic-gate * The first four types of open/close calls obey the protocol rule 52*0Sstevel@tonic-gate * that many more opens may occur for a given minor(dev) for that type of open, 53*0Sstevel@tonic-gate * but a close call happens only on the last close of that dev. 54*0Sstevel@tonic-gate * This protocol allows a flag to be used (set by opens, cleared by closes) 55*0Sstevel@tonic-gate * to keep track of the state for a given minor device value. 56*0Sstevel@tonic-gate * 57*0Sstevel@tonic-gate * Calls of the fifth type (OTYP_LYR) must obey the protocol rule 58*0Sstevel@tonic-gate * that open and close call calls are always paired. This protocol 59*0Sstevel@tonic-gate * permits several drivers to be layers above the same device driver. 60*0Sstevel@tonic-gate * A counter can be used for this protocol. 61*0Sstevel@tonic-gate * 62*0Sstevel@tonic-gate * The value OTYPCNT is defined for the purpose of declaring arrays 63*0Sstevel@tonic-gate * in drivers and for performing range checks (0 <= otyp < OTYPCNT) 64*0Sstevel@tonic-gate * on values passed. 65*0Sstevel@tonic-gate */ 66*0Sstevel@tonic-gate 67*0Sstevel@tonic-gate #define OTYPCNT 5 68*0Sstevel@tonic-gate #define OTYP_BLK 0 69*0Sstevel@tonic-gate #define OTYP_MNT 1 70*0Sstevel@tonic-gate #define OTYP_CHR 2 71*0Sstevel@tonic-gate #define OTYP_SWP 3 72*0Sstevel@tonic-gate #define OTYP_LYR 4 73*0Sstevel@tonic-gate 74*0Sstevel@tonic-gate #ifdef __cplusplus 75*0Sstevel@tonic-gate } 76*0Sstevel@tonic-gate #endif 77*0Sstevel@tonic-gate 78*0Sstevel@tonic-gate #endif /* _SYS_OPEN_H */ 79