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Annotation of driverkit/libDriver/Kernel/IOBufDevice.m, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: /*     Copyright (c) 1991 NeXT Computer, Inc.  All rights reserved. 
        !            25:  *
        !            26:  * IOBufDevice.m - Buffered Device abstract superclass.
        !            27:  *
        !            28:  * HISTORY
        !            29:  * 13-Jan-93   John Seamons (jks) at NeXT
        !            30:  *     Ported to i386.
        !            31:  *
        !            32:  * 23-Jun-92   Mike DeMoney ([email protected])
        !            33:  *      Major hacks... 
        !            34:  *
        !            35:  * 16-Jul-91    Doug Mitchell at NeXT
        !            36:  *      Created. 
        !            37:  *
        !            38:  * FIXME:
        !            39:  *     Check unit number.  Clean-up unit number usage between this
        !            40:  *     class and subclasses.
        !            41:  */
        !            42: 
        !            43: #import <driverkit/IOBufDevice.h>
        !            44: 
        !            45: #import        <sys/errno.h>
        !            46: 
        !            47: @interface IOBufDevice (ProxyForSubclass)
        !            48: - (IOReturn)initializeUnit                     : (unsigned) unitNumber;
        !            49: - (IOReturn)shutdownUnit                       : (unsigned) unitNumber;
        !            50: @end
        !            51: 
        !            52: @implementation IOBufDevice
        !            53: 
        !            54: - init
        !            55: {
        !            56:        unsigned unit;
        !            57:        UnitInfo *unitInfoP;
        !            58: 
        !            59:        for (unit = 0; unit < MAX_IOBUFDEVICE_UNITS; unit += 1) {
        !            60:                unitInfoP = &unitInfo[unit];
        !            61:                unitInfoP->callbackId = nil;
        !            62:                unitInfoP->deviceTag = 0;
        !            63:                unitInfoP->ownerName[0] = '\0';
        !            64:        }
        !            65:        return self;
        !            66: }
        !            67: 
        !            68: - (IOReturn)acquireUnit                                : (unsigned) unit
        !            69:                                for             : (OwnerName) newName
        !            70:                                callbackId      : (id) newId
        !            71:                                deviceTag       : (Tag) newTag;
        !            72: {
        !            73:        UnitInfo *unitInfoP = &unitInfo[unit];
        !            74: 
        !            75:        if (unitInfoP->callbackId != NULL) {
        !            76:                return /* FIXME */ IO_R_BUSY;
        !            77:        }
        !            78:        strncpy(unitInfoP->ownerName, newName, sizeof(unitInfoP->ownerName));
        !            79:        unitInfoP->callbackId = newId;
        !            80:        unitInfoP->deviceTag = newTag;
        !            81:        [self initializeUnit:unit];
        !            82:        return IO_R_SUCCESS;
        !            83: }
        !            84: 
        !            85: 
        !            86: - (IOReturn)releaseUnit                                : (unsigned) unit
        !            87: {
        !            88:        UnitInfo *unitInfoP = &unitInfo[unit];
        !            89: 
        !            90:        if (unitInfoP->callbackId == NULL) {
        !            91:                return /* FIXME */ IO_R_NOT_OWNER;
        !            92:        }
        !            93:        [self shutdownUnit:unit];
        !            94:        unitInfoP->callbackId = NULL;
        !            95:        unitInfoP->ownerName[0] = '\0';
        !            96:        return IO_R_SUCCESS;
        !            97: }
        !            98: 
        !            99: - (IOReturn)ownerForUnit               : (unsigned) unit
        !           100:                        isNamed         : (OwnerName) currentName
        !           101: {
        !           102:        UnitInfo *unitInfoP = &unitInfo[unit];
        !           103: 
        !           104:        strncpy(currentName, unitInfoP->ownerName, sizeof(currentName));
        !           105:        return IO_R_SUCCESS;
        !           106: }
        !           107: 
        !           108: /*
        !           109:  * Convert an IOReturn to text. Subclasses which add additional
        !           110:  * IOReturn's should override this method and call [super ioReturnText] if
        !           111:  * the desired value is not found.
        !           112:  */
        !           113: - (const char *)stringFromReturn       : (IOReturn) rtn
        !           114: {
        !           115:        switch (rtn) {
        !           116:        case IO_R_FLUSHED:
        !           117:                return "Buffer Flushed";
        !           118:        case IO_R_NOT_OWNER:
        !           119:                return "Not Owner";
        !           120:        }
        !           121:        return [super stringFromReturn:rtn];
        !           122: }
        !           123: 
        !           124: /*
        !           125:  * Convert an IOReturn to a Unix errno.
        !           126:  */
        !           127: - (int)errnoFromReturn                         : (IOReturn) rtn
        !           128: {
        !           129:        switch (rtn) {
        !           130:        case IO_R_FLUSHED:
        !           131:                return ESHUTDOWN;
        !           132:        case IO_R_NOT_OWNER:
        !           133:                return EPERM;
        !           134:        }
        !           135:        return [super errnoFromReturn:rtn];
        !           136: }
        !           137: @end
        !           138: 
        !           139: @implementation IOBufDevice (ProxyForSubclass)
        !           140: - (IOReturn)initializeUnit                     : (unsigned) unitNumber
        !           141: {
        !           142: }
        !           143: 
        !           144: - (IOReturn)shutdownUnit                       : (unsigned) unitNumber
        !           145: {
        !           146: }
        !           147: @end

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