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/usr/include/netax25/mheard.h is in libax25-dev 0.0.12-rc2+cvs20120204-3.

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/* LIBAX25 - Library for AX.25 programs
 * Copyright (C) 1997-1999 Jonathan Naylor, Tomi Manninen, Jean-Paul Roubelat
 * and Alan Cox.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
/*
 * This file documents the layout of the mheard file. Since this file is
 * common to at least two of the AX25 utilities, it is documented here.
 */
#ifndef MHEARD_H
#define	MHEARD_H

struct mheard_struct {
	ax25_address from_call;
	ax25_address to_call;
	char         portname[20];
	unsigned int count;
	unsigned int sframes;
	unsigned int uframes;
	unsigned int iframes;
	unsigned int ndigis;
	ax25_address digis[8];
	time_t       first_heard;
	time_t       last_heard;

#define	MHEARD_TYPE_SABM	0
#define	MHEARD_TYPE_SABME	1
#define	MHEARD_TYPE_DISC	2
#define	MHEARD_TYPE_UA		3
#define	MHEARD_TYPE_DM		4
#define	MHEARD_TYPE_RR		5
#define	MHEARD_TYPE_RNR		6
#define	MHEARD_TYPE_REJ		7
#define	MHEARD_TYPE_FRMR	8
#define	MHEARD_TYPE_I		9
#define	MHEARD_TYPE_UI		10
#define	MHEARD_TYPE_UNKNOWN	11
	unsigned int type;
	
#define	MHEARD_MODE_TEXT	0x0001
#define	MHEARD_MODE_ARP		0x0002
#define	MHEARD_MODE_IP_DG	0x0004
#define	MHEARD_MODE_IP_VC	0x0008
#define	MHEARD_MODE_NETROM	0x0010
#define	MHEARD_MODE_ROSE	0x0020
#define	MHEARD_MODE_FLEXNET	0x0040
#define	MHEARD_MODE_TEXNET	0x0080
#define	MHEARD_MODE_PSATPB	0x0100
#define	MHEARD_MODE_PSATFT	0x0200
#define	MHEARD_MODE_SEGMENT	0x4000
#define	MHEARD_MODE_UNKNOWN	0x8000
	unsigned int  mode;

	char          spare[128];
};

#endif