This file is indexed.

/usr/arm-linux-gnueabihf/include/linux/if_slip.h is in linux-libc-dev-armhf-cross 3.2.0-23.36cross1.82.

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The actual contents of the file can be viewed below.

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/*
 *	Swansea University Computer Society	NET3
 *	
 *	This file declares the constants of special use with the SLIP/CSLIP/
 *	KISS TNC driver.
 */
 
#ifndef __LINUX_SLIP_H
#define __LINUX_SLIP_H

#define		SL_MODE_SLIP		0
#define		SL_MODE_CSLIP		1
#define 	SL_MODE_KISS		4

#define		SL_OPT_SIXBIT		2
#define		SL_OPT_ADAPTIVE		8

/*
 *	VSV = ioctl for keepalive & outfill in SLIP driver 
 */
 
#define SIOCSKEEPALIVE	(SIOCDEVPRIVATE)		/* Set keepalive timeout in sec */
#define SIOCGKEEPALIVE	(SIOCDEVPRIVATE+1)		/* Get keepalive timeout */
#define SIOCSOUTFILL	(SIOCDEVPRIVATE+2)		/* Set outfill timeout */
#define	SIOCGOUTFILL	(SIOCDEVPRIVATE+3)		/* Get outfill timeout */
#define SIOCSLEASE	(SIOCDEVPRIVATE+4)		/* Set "leased" line type */
#define	SIOCGLEASE	(SIOCDEVPRIVATE+5)		/* Get line type */


#endif