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Annotation of XNU/bsd/sys/ioccom.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            23: /*-
        !            24:  * Copyright (c) 1982, 1986, 1990, 1993, 1994
        !            25:  *     The Regents of the University of California.  All rights reserved.
        !            26:  *
        !            27:  * Redistribution and use in source and binary forms, with or without
        !            28:  * modification, are permitted provided that the following conditions
        !            29:  * are met:
        !            30:  * 1. Redistributions of source code must retain the above copyright
        !            31:  *    notice, this list of conditions and the following disclaimer.
        !            32:  * 2. Redistributions in binary form must reproduce the above copyright
        !            33:  *    notice, this list of conditions and the following disclaimer in the
        !            34:  *    documentation and/or other materials provided with the distribution.
        !            35:  * 3. All advertising materials mentioning features or use of this software
        !            36:  *    must display the following acknowledgement:
        !            37:  *     This product includes software developed by the University of
        !            38:  *     California, Berkeley and its contributors.
        !            39:  * 4. Neither the name of the University nor the names of its contributors
        !            40:  *    may be used to endorse or promote products derived from this software
        !            41:  *    without specific prior written permission.
        !            42:  *
        !            43:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            44:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            45:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            46:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            47:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            48:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            49:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            50:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            51:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            52:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            53:  * SUCH DAMAGE.
        !            54:  *
        !            55:  *     @(#)ioccom.h    8.2 (Berkeley) 3/28/94
        !            56:  */
        !            57: 
        !            58: #ifndef        _SYS_IOCCOM_H_
        !            59: #define        _SYS_IOCCOM_H_
        !            60: 
        !            61: /*
        !            62:  * Ioctl's have the command encoded in the lower word, and the size of
        !            63:  * any in or out parameters in the upper word.  The high 3 bits of the
        !            64:  * upper word are used to encode the in/out status of the parameter.
        !            65:  */
        !            66: #define        IOCPARM_MASK    0x1fff          /* parameter length, at most 13 bits */
        !            67: #define        IOCPARM_LEN(x)  (((x) >> 16) & IOCPARM_MASK)
        !            68: #define        IOCBASECMD(x)   ((x) & ~(IOCPARM_MASK << 16))
        !            69: #define        IOCGROUP(x)     (((x) >> 8) & 0xff)
        !            70: 
        !            71: #define        IOCPARM_MAX     (IOCPARM_MASK + 1)      /* max size of ioctl args */
        !            72:                                /* no parameters */
        !            73: #define        IOC_VOID        (unsigned long)0x20000000
        !            74:                                /* copy parameters out */
        !            75: #define        IOC_OUT         (unsigned long)0x40000000
        !            76:                                /* copy parameters in */
        !            77: #define        IOC_IN          (unsigned long)0x80000000
        !            78:                                /* copy paramters in and out */
        !            79: #define        IOC_INOUT       (IOC_IN|IOC_OUT)
        !            80:                                /* mask for IN/OUT/VOID */
        !            81: #define        IOC_DIRMASK     (unsigned long)0xe0000000
        !            82: 
        !            83: #define        _IOC(inout,group,num,len) \
        !            84:        (inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num))
        !            85: #define        _IO(g,n)        _IOC(IOC_VOID,  (g), (n), 0)
        !            86: #define        _IOR(g,n,t)     _IOC(IOC_OUT,   (g), (n), sizeof(t))
        !            87: #define        _IOW(g,n,t)     _IOC(IOC_IN,    (g), (n), sizeof(t))
        !            88: /* this should be _IORW, but stdio got there first */
        !            89: #define        _IOWR(g,n,t)    _IOC(IOC_INOUT, (g), (n), sizeof(t))
        !            90: 
        !            91: #endif /* !_SYS_IOCCOM_H_ */

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