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Annotation of OSKit-Mach/include/sys/ioctl.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Mach Operating System
                      3:  * Copyright (c) 1991 Carnegie Mellon University
                      4:  * All Rights Reserved.
                      5:  *
                      6:  * Permission to use, copy, modify and distribute this software and its
                      7:  * documentation is hereby granted, provided that both the copyright
                      8:  * notice and this permission notice appear in all copies of the
                      9:  * software, derivative works or modified versions, and any portions
                     10:  * thereof, and that both notices appear in supporting documentation.
                     11:  *
                     12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     15:  *
                     16:  * Carnegie Mellon requests users of this software to return to
                     17:  *
                     18:  *  Software Distribution Coordinator  or  [email protected]
                     19:  *  School of Computer Science
                     20:  *  Carnegie Mellon University
                     21:  *  Pittsburgh PA 15213-3890
                     22:  *
                     23:  * any improvements or extensions that they make and grant Carnegie Mellon rights
                     24:  * to redistribute these changes.
                     25:  */
                     26: /*
                     27:  * Format definitions for 'ioctl' commands in device definitions.
                     28:  *
                     29:  * From BSD4.4.
                     30:  */
                     31: 
                     32: #ifndef _MACH_SYS_IOCTL_H_
                     33: #define _MACH_SYS_IOCTL_H_
                     34: /*
                     35:  * Ioctl's have the command encoded in the lower word, and the size of
                     36:  * any in or out parameters in the upper word.  The high 3 bits of the
                     37:  * upper word are used to encode the in/out status of the parameter.
                     38:  */
                     39: #define        IOCPARM_MASK    0x1fff          /* parameter length, at most 13 bits */
                     40: #define        IOC_VOID        0x20000000      /* no parameters */
                     41: #define        IOC_OUT         0x40000000      /* copy out parameters */
                     42: #define        IOC_IN          0x80000000U     /* copy in parameters */
                     43: #define        IOC_INOUT       (IOC_IN|IOC_OUT)
                     44: 
                     45: #define _IOC(inout,group,num,len) \
                     46:        (inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num))
                     47: #define        _IO(g,n)        _IOC(IOC_VOID,  (g), (n), 0)
                     48: #define        _IOR(g,n,t)     _IOC(IOC_OUT,   (g), (n), sizeof(t))
                     49: #define        _IOW(g,n,t)     _IOC(IOC_IN,    (g), (n), sizeof(t))
                     50: #define        _IOWR(g,n,t)    _IOC(IOC_INOUT, (g), (n), sizeof(t))
                     51: 
                     52: #endif  /* _MACH_SYS_IOCTL_H_ */

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