usr/src/sys/net/if_slvar.h

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)if_slvar.h  7.9 (Berkeley) %G%
 *
 * $Header: if_slvar.h,v 1.3 89/05/31 02:25:18 van Exp $
 */

/*
 * Definitions for SLIP interface data structures
 *
 * (This exists so programs like slstats can get at the definition
 *  of sl_softc.)
 */
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 */
        long    sc_lasttime;            /* last time a char arrived */
        long    sc_abortcount;          /* number of abort esacpe chars */
        long    sc_starttime;           /* time of first abort in window */
#ifdef INET                             /* XXX */
        struct  slcompress sc_comp;     /* tcp compression data */
#endif
};

/* visible flags */
#define SC_COMPRESS     IFF_LINK0       /* compress TCP traffic */
#define SC_NOICMP       IFF_LINK1       /* supress ICMP traffic */
#define SC_AUTOCOMP     IFF_LINK2       /* auto-enable TCP compression */

/* this stuff doesn't belong here... */
#define SLIOCGUNIT      _IOR('t', 88, int)      /* get slip unit number */