usr/src/sys/net/if_slvar.h

/*      @(#)if_slvar.h  7.4 (Berkeley) %G% */

/*
 * Definitions for SLIP interface data structures
 *
 * (this exists so programs like slstats can get at the definition
 *  of sl_softc.)
 *
 * $Header: if_slvar.h,v 1.3 89/05/31 02:25:18 van Exp $
 */
struct sl_softc {
        struct  ifnet sc_if;            /* network-visible interface */
        struct  ifqueue sc_fastq;       /* interactive output queue */
        struct  tty *sc_ttyp;           /* pointer to tty structure */
        u_char  *sc_mp;                 /* pointer to next available buf char */
        u_char  *sc_ep;                 /* pointer to last available buf char */
        u_char  *sc_buf;                /* input buffer */
        u_int   sc_flags;               /* see below */
        u_int   sc_escape;      /* =1 if last char input was FRAME_ESCAPE */
        u_int   sc_bytessent;
        u_int   sc_bytesrcvd;
        long    sc_lasttime;            /* last time a char arrived */
        long    sc_starttime;           /* last time a char arrived */
        long    sc_abortcount;          /* number of abort esacpe chars */
#ifdef INET                             /* XXX */
        struct  slcompress sc_comp;     /* tcp compression data */
#endif
};

/* visible flags */
#define SC_COMPRESS     0x0002          /* compress TCP traffic */
#define SC_NOICMP       0x0004          /* supress ICMP traffic */
#define SC_AUTOCOMP     0x0008          /* auto-enable TCP compression */
/* internal flags (should be separate) */
#define SC_ABORT        0x10000         /* have been sent an abort request */

/* this stuff doesn't belong here... */
#define SLIOCGFLAGS     _IOR('t', 90, int)      /* get configuration flags */
#define SLIOCSFLAGS     _IOW('t', 89, int)      /* set configuration flags */
#define SLIOGUNIT       _IOW('t', 88, int)      /* get slip unit number */