#ifndef	__unp_rtt_h
#define	__unp_rtt_h

#include <stdint.h>
#include <sys/types.h>

struct rtt_info {
    float       rtt_rtt;	/* most recent measured RTT, seconds */
    float       rtt_srtt;	/* smoothed RTT estimator, seconds */
    float       rtt_rttvar;	/* smoothed mean deviation, seconds */
    float       rtt_rto;	/* current RTO to use, seconds */
    int         rtt_nrexmt;	/* #times retransmitted: 0, 1, 2, ... */
    uint32_t    rtt_base;	/* #sec since 1/1/1970 at start */
    uint8_t     rtt_retry;
};

#define RTT_RXTMIN      2   /* min retransmit timeout value, seconds */
#define RTT_RXTMAX      60  /* max retransmit timeout value, seconds */
#define RTT_MAXNREXMT   4   /* max #times to retransmit */
#define RTT_MAXRTO      12

				/* function prototypes */
void	 rtt_debug(struct rtt_info *);
void	 rtt_init(struct rtt_info *, uint8_t);
void	 rtt_newpack(struct rtt_info *);
int		 rtt_start(struct rtt_info *);
void	 rtt_stop(struct rtt_info *, uint32_t);
int		 rtt_timeout(struct rtt_info *);
uint32_t rtt_ts(struct rtt_info *);

extern int	rtt_d_flag;	/* can be set nonzero for addl info */

#endif	/* __unp_rtt_h */