ioctl.h

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/*
 * 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 3 bits of the
 * upper word are used to encode the in/out status of the parameter.
 */
#define IOCPARM_SHIFT   13              /* number of bits for ioctl size */
#define IOCPARM_MASK    ((1 << IOCPARM_SHIFT) - 1) /* parameter length mask */
#define IOCPARM_LEN(x)  (((x) >> 16) & IOCPARM_MASK)
#define IOCBASECMD(x)   ((x) & ~(IOCPARM_MASK << 16))
#define IOCGROUP(x)     (((x) >> 8) & 0xff)
 
#define IOCPARM_MAX     (1 << IOCPARM_SHIFT) /* max size of ioctl */
#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)
#define IOC_DIRMASK     (IOC_VOID|IOC_OUT|IOC_IN)
 
#define _IOC(inout,group,num,len)       ((unsigned long) \
        ((inout) | (((len) & IOCPARM_MASK) << 16) | ((group) << 8) | (num)))
#define _IO(g,n)        _IOC(IOC_VOID,  (g), (n), 0)
#define _IOWINT(g,n)    _IOC(IOC_VOID,  (g), (n), sizeof(int))
#define _IOR(g,n,t)     _IOC(IOC_OUT,   (g), (n), sizeof(t))
#define _IOW(g,n,t)     _IOC(IOC_IN,    (g), (n), sizeof(t))
/* this should be _IORW, but stdio got there first */
#define _IOWR(g,n,t)    _IOC(IOC_INOUT, (g), (n), sizeof(t))
 
#define IOCPARM_IVAL(x) ((int)(intptr_t)(void *)*(caddr_t *)(void *)(x))
 
#define NCCS 20
 
typedef unsigned int tcflag_t;
typedef unsigned char cc_t;
typedef unsigned int speed_t;
 
struct termios {
    tcflag_t c_iflag; /* input flags */
    tcflag_t c_oflag; /* output flags */
    tcflag_t c_cflag; /* control flags */
    tcflag_t c_lflag; /* local flags */
    cc_t c_cc[NCCS]; /* control chars */
    speed_t c_ispeed; /* input speed */
    speed_t c_ospeed; /* output speed */
};
 
struct winsize {
    unsigned short ws_row; /* rows, in characters */
    unsigned short ws_col; /* columns, in characters */
    unsigned short ws_xpixel; /* horizontal size, pixels */
    unsigned short ws_ypixel; /* vertical size, pixels */
};
 
#define       TIOCGETA        _IOR('t', 19, struct termios) /* get termios struct */
#define       TIOCGWINSZ      _IOR('t', 104, struct winsize)  /* get window size */