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/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#ifndef __sys_ioccom_h
#define __sys_ioccom_h
/*
* Ioctl's have the command encoded in the lower word,
* and the size of any in or out parameters in the upper
* word. The high 2 bits of the upper word are used
* to encode the in/out status of the parameter; for now
* we restrict parameters to at most 255 bytes.
*/
#define _IOCPARM_MASK 0xff /* parameters must be < 256 bytes */
#define _IOC_VOID 0x20000000 /* no parameters */
#define _IOC_OUT 0x40000000 /* copy out parameters */
#define _IOC_IN 0x80000000 /* copy in parameters */
#define _IOC_INOUT (_IOC_IN|_IOC_OUT)
/* the 0x20000000 is so we can distinguish new ioctl's from old */
#define _IO(x,y) (_IOC_VOID|('x'<<8)|y)
#define _IOR(x,y,t) (_IOC_OUT|((sizeof(t)&_IOCPARM_MASK)<<16)|('x'<<8)|y)
#define _IORN(x,y,t) (_IOC_OUT|(((t)&_IOCPARM_MASK)<<16)|('x'<<8)|y)
#define _IOW(x,y,t) (_IOC_IN|((sizeof(t)&_IOCPARM_MASK)<<16)|('x'<<8)|y)
#define _IOWN(x,y,t) (_IOC_IN|(((t)&_IOCPARM_MASK)<<16)|('x'<<8)|y)
/* this should be _IORW, but stdio got there first */
#define _IOWR(x,y,t) (_IOC_INOUT|((sizeof(t)&_IOCPARM_MASK)<<16)|('x'<<8)|y)
#define _IOWRN(x,y,t) (_IOC_INOUT|(((t)&_IOCPARM_MASK)<<16)|('x'<<8)|y)
#endif /* !__sys_ioccom_h */
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