The C and C++ Include Header Files

/usr/include/linux/if_slip.h


$ cat -n /usr/include/linux/if_slip.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	/*
     3	 *	Swansea University Computer Society	NET3
     4	 *	
     5	 *	This file declares the constants of special use with the SLIP/CSLIP/
     6	 *	KISS TNC driver.
     7	 */
     8	 
     9	#ifndef __LINUX_SLIP_H
    10	#define __LINUX_SLIP_H
    11	
    12	#define		SL_MODE_SLIP		0
    13	#define		SL_MODE_CSLIP		1
    14	#define 	SL_MODE_KISS		4
    15	
    16	#define		SL_OPT_SIXBIT		2
    17	#define		SL_OPT_ADAPTIVE		8
    18	
    19	/*
    20	 *	VSV = ioctl for keepalive & outfill in SLIP driver 
    21	 */
    22	 
    23	#define SIOCSKEEPALIVE	(SIOCDEVPRIVATE)		/* Set keepalive timeout in sec */
    24	#define SIOCGKEEPALIVE	(SIOCDEVPRIVATE+1)		/* Get keepalive timeout */
    25	#define SIOCSOUTFILL	(SIOCDEVPRIVATE+2)		/* Set outfill timeout */
    26	#define	SIOCGOUTFILL	(SIOCDEVPRIVATE+3)		/* Get outfill timeout */
    27	#define SIOCSLEASE	(SIOCDEVPRIVATE+4)		/* Set "leased" line type */
    28	#define	SIOCGLEASE	(SIOCDEVPRIVATE+5)		/* Get line type */
    29	
    30	
    31	#endif