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Annotation of sys/sys/ioccom.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: ioccom.h,v 1.4 2006/05/18 21:27:25 miod Exp $ */
                      2: /*     $NetBSD: ioccom.h,v 1.4 1994/10/30 21:49:56 cgd Exp $   */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1982, 1986, 1990, 1993, 1994
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. Neither the name of the University nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  *
                     32:  *     @(#)ioccom.h    8.2 (Berkeley) 3/28/94
                     33:  */
                     34:
                     35: #ifndef        _SYS_IOCCOM_H_
                     36: #define        _SYS_IOCCOM_H_
                     37:
                     38: /*
                     39:  * Ioctl's have the command encoded in the lower word, and the size of
                     40:  * any in or out parameters in the upper word.  The high 3 bits of the
                     41:  * upper word are used to encode the in/out status of the parameter.
                     42:  */
                     43: #define        IOCPARM_MASK    0x1fff          /* parameter length, at most 13 bits */
                     44: #define        IOCPARM_LEN(x)  (((x) >> 16) & IOCPARM_MASK)
                     45: #define        IOCBASECMD(x)   ((x) & ~(IOCPARM_MASK << 16))
                     46: #define        IOCGROUP(x)     (((x) >> 8) & 0xff)
                     47:
                     48: #define        IOCPARM_MAX     NBPG    /* max size of ioctl args, mult. of NBPG */
                     49:                                /* no parameters */
                     50: #define        IOC_VOID        (unsigned long)0x20000000
                     51:                                /* copy parameters out */
                     52: #define        IOC_OUT         (unsigned long)0x40000000
                     53:                                /* copy parameters in */
                     54: #define        IOC_IN          (unsigned long)0x80000000
                     55:                                /* copy parameters in and out */
                     56: #define        IOC_INOUT       (IOC_IN|IOC_OUT)
                     57:                                /* mask for IN/OUT/VOID */
                     58: #define        IOC_DIRMASK     (unsigned long)0xe0000000
                     59:
                     60: #define        _IOC(inout,group,num,len) \
                     61:        (inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num))
                     62: #define        _IO(g,n)        _IOC(IOC_VOID,  (g), (n), 0)
                     63: #define        _IOR(g,n,t)     _IOC(IOC_OUT,   (g), (n), sizeof(t))
                     64: #define        _IOW(g,n,t)     _IOC(IOC_IN,    (g), (n), sizeof(t))
                     65: /* this should be _IORW, but stdio got there first */
                     66: #define        _IOWR(g,n,t)    _IOC(IOC_INOUT, (g), (n), sizeof(t))
                     67:
                     68: #endif /* !_SYS_IOCCOM_H_ */