diff options
Diffstat (limited to 'usr.sbin/xntpd/ntpdate/ntpdate.h')
| -rw-r--r-- | usr.sbin/xntpd/ntpdate/ntpdate.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/usr.sbin/xntpd/ntpdate/ntpdate.h b/usr.sbin/xntpd/ntpdate/ntpdate.h new file mode 100644 index 0000000..4a8ff74 --- /dev/null +++ b/usr.sbin/xntpd/ntpdate/ntpdate.h @@ -0,0 +1,86 @@ +/* ntpdate.h,v 3.1 1993/07/06 01:09:23 jbj Exp + * ntpdate.h - declarations for the ntpdate program + */ + +#include "ntp_malloc.h" + +/* + * The server structure is a much simplified version of the + * peer structure, for ntpdate's use. Since we always send + * in client mode and expect to receive in server mode, this + * leaves only a very limited number of things we need to + * remember about the server. + */ +struct server { + struct sockaddr_in srcadr; /* address of remote host */ + u_char leap; /* leap indicator */ + u_char stratum; /* stratum of remote server */ + s_char precision; /* server's clock precision */ + u_char trust; /* trustability of the filtered data */ + u_fp rootdelay; /* distance from primary clock */ + u_fp rootdispersion; /* peer clock dispersion */ + U_LONG refid; /* peer reference ID */ + l_fp reftime; /* time of peer's last update */ + U_LONG event_time; /* time for next timeout */ + u_short xmtcnt; /* number of packets transmitted */ + u_short filter_nextpt; /* index into filter shift register */ + s_fp filter_delay[NTP_SHIFT]; /* delay part of shift register */ + l_fp filter_offset[NTP_SHIFT]; /* offset part of shift register */ + s_fp filter_soffset[NTP_SHIFT]; /* offset in s_fp format, for disp */ + u_fp filter_error[NTP_SHIFT]; /* error part of shift register */ + l_fp org; /* peer's originate time stamp */ + l_fp xmt; /* transmit time stamp */ + u_fp delay; /* filter estimated delay */ + u_fp dispersion; /* filter estimated dispersion */ + l_fp offset; /* filter estimated clock offset */ + s_fp soffset; /* fp version of above */ +}; + + +/* + * ntpdate runs everything on a simple, short timeout. It sends a + * packet and sets the timeout (by default, to a small value suitable + * for a LAN). If it receives a response it sends another request. + * If it times out it shifts zeroes into the filter and sends another + * request. + * + * The timer routine is run often (once every 1/5 second currently) + * so that time outs are done with reasonable precision. + */ +#define TIMER_HZ (5) /* 5 per second */ + +/* + * ntpdate will make a LONG adjustment using adjtime() if the times + * are close, or step the time if the times are farther apart. The + * following defines what is "close". + */ +#define NTPDATE_THRESHOLD (FP_SECOND >> 1) /* 1/2 second */ + +/* + * When doing adjustments, ntpdate actually overadjusts (currently + * by 50%, though this may change). While this will make it take longer + * to reach a steady state condition, it will typically result in + * the clock keeping more accurate time, on average. The amount of + * overshoot is limited. + */ +#ifdef NOTNOW +#define ADJ_OVERSHOOT 1/2 /* this is hard coded */ +#endif /* NOTNOW */ +#define ADJ_MAXOVERSHOOT 0x10000000 /* 50 ms as a ts fraction */ + +/* + * Since ntpdate isn't aware of some of the things that normally get + * put in an NTP packet, we fix some values. + */ +#define NTPDATE_PRECISION (-6) /* use this precision */ +#define NTPDATE_DISTANCE FP_SECOND /* distance is 1 sec */ +#define NTPDATE_DISP FP_SECOND /* so is the dispersion */ +#define NTPDATE_REFID (0) /* reference ID to use */ + + +/* + * Some defaults + */ +#define DEFTIMEOUT 5 /* 5 timer increments */ +#define DEFSAMPLES 4 /* get 4 samples per server */ +#define DEFPRECISION (-5) /* the precision we claim */ |
