Annotation of embedaddon/ntp/ntpdate/ntpdate.h, revision 1.1.1.1
1.1 misho 1: /*
2: * ntpdate.h - declarations for the ntpdate and ntptimeset programs
3: */
4:
5: #include "ntp_malloc.h"
6:
7: extern void loadservers (char *cfgpath);
8:
9: /*
10: * The server structure is a much simplified version of the
11: * peer structure, for ntpdate's use. Since we always send
12: * in client mode and expect to receive in server mode, this
13: * leaves only a very limited number of things we need to
14: * remember about the server.
15: */
16: struct server {
17: struct server *next_server; /* next server in build list */
18: sockaddr_u srcadr; /* address of remote host */
19: u_char version; /* version to use */
20: u_char leap; /* leap indicator */
21: u_char stratum; /* stratum of remote server */
22: s_char precision; /* server's clock precision */
23: u_char trust; /* trustability of the filtered data */
24: u_fp rootdelay; /* distance from primary clock */
25: u_fp rootdisp; /* peer clock dispersion */
26: u_int32 refid; /* peer reference ID */
27: l_fp reftime; /* time of peer's last update */
28: u_long event_time; /* time for next timeout */
29: u_long last_xmit; /* time of last transmit */
30: u_short xmtcnt; /* number of packets transmitted */
31: u_short rcvcnt; /* number of packets received */
32: u_char reach; /* reachability, NTP_WINDOW bits */
33: u_short filter_nextpt; /* index into filter shift register */
34: s_fp filter_delay[NTP_SHIFT]; /* delay part of shift register */
35: l_fp filter_offset[NTP_SHIFT]; /* offset part of shift register */
36: s_fp filter_soffset[NTP_SHIFT]; /* offset in s_fp format, for disp */
37: u_fp filter_error[NTP_SHIFT]; /* error part of shift register */
38: l_fp org; /* peer's originate time stamp */
39: l_fp xmt; /* transmit time stamp */
40: u_fp delay; /* filter estimated delay */
41: u_fp dispersion; /* filter estimated dispersion */
42: l_fp offset; /* filter estimated clock offset */
43: s_fp soffset; /* fp version of above */
44: };
45:
46:
47: /*
48: * ntpdate runs everything on a simple, short timeout. It sends a
49: * packet and sets the timeout (by default, to a small value suitable
50: * for a LAN). If it receives a response it sends another request.
51: * If it times out it shifts zeroes into the filter and sends another
52: * request.
53: *
54: * The timer routine is run often (once every 1/5 second currently)
55: * so that time outs are done with reasonable precision.
56: */
57: #define TIMER_HZ (5) /* 5 per second */
58:
59: /*
60: * ntpdate will make a long adjustment using adjtime() if the times
61: * are close, or step the time if the times are farther apart. The
62: * following defines what is "close".
63: */
64: #define NTPDATE_THRESHOLD (FP_SECOND >> 1) /* 1/2 second */
65:
66: #define NTP_MAXAGE 86400 /* one day in seconds */
67:
68: /*
69: * When doing adjustments, ntpdate actually overadjusts (currently
70: * by 50%, though this may change). While this will make it take longer
71: * to reach a steady state condition, it will typically result in
72: * the clock keeping more accurate time, on average. The amount of
73: * overshoot is limited.
74: */
75: #ifdef NOTNOW
76: #define ADJ_OVERSHOOT 1/2 /* this is hard coded */
77: #endif /* NOTNOW */
78: #define ADJ_MAXOVERSHOOT 0x10000000 /* 50 ms as a ts fraction */
79:
80: /*
81: * Since ntpdate isn't aware of some of the things that normally get
82: * put in an NTP packet, we fix some values.
83: */
84: #define NTPDATE_PRECISION (-6) /* use this precision */
85: #define NTPDATE_DISTANCE FP_SECOND /* distance is 1 sec */
86: #define NTPDATE_DISP FP_SECOND /* so is the dispersion */
87: #define NTPDATE_REFID (0) /* reference ID to use */
88: #define PEER_MAXDISP (64*FP_SECOND) /* maximum dispersion (fp 64) */
89:
90:
91: /*
92: * Some defaults
93: */
94: #define MINTIMEOUT (2 * TIMER_HZ) /* 2s min. between packets */
95: #define DEFTIMEOUT MINTIMEOUT /* (to the same server) */
96: #define DEFSAMPLES 4 /* get 4 samples per server */
97: #define DEFPRECISION (-5) /* the precision we claim */
98: #define DEFMAXPERIOD 60 /* maximum time to wait */
99: #define DEFMINSERVERS 3 /* minimum responding servers */
100: #define DEFMINVALID 1 /* mimimum servers with valid time */
101:
102: /*
103: * Define the max number of sockets we can open
104: */
105: #define MAX_AF 2
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