Annotation of embedaddon/ntp/include/ntp_unixtime.h, revision 1.1.1.1
1.1 misho 1: /*
2: * ntp_unixtime.h - contains constants and macros for converting between
3: * NTP time stamps (l_fp) and Unix times (struct timeval)
4: */
5:
6: #include "ntp_types.h"
7:
8: #ifdef SIM
9: #include "ntpsim.h"
10: #endif
11:
12: #ifdef SIM
13: # define GETTIMEOFDAY(a, b) (node_gettime(&ntp_node, a))
14: # define SETTIMEOFDAY(a, b) (node_settime(&ntp_node, a))
15: # define ADJTIMEOFDAY(a, b) (node_adjtime(&ntp_node, a, b))
16: #else
17: # define ADJTIMEOFDAY(a, b) (adjtime(a, b))
18: /* gettimeofday() takes two args in BSD and only one in SYSV */
19: # if defined(HAVE_SYS_TIMERS_H) && defined(HAVE_GETCLOCK)
20: # include <sys/timers.h>
21: int getclock (int clock_type, struct timespec *tp);
22: /* Don't #define GETTIMEOFDAY because we shouldn't be using it in this case. */
23: # define SETTIMEOFDAY(a, b) (settimeofday(a, b))
24: # else /* not (HAVE_SYS_TIMERS_H && HAVE_GETCLOCK) */
25: # ifdef SYSV_TIMEOFDAY
26: # define GETTIMEOFDAY(a, b) (gettimeofday(a))
27: # define SETTIMEOFDAY(a, b) (settimeofday(a))
28: # else /* ! SYSV_TIMEOFDAY */
29: #if defined SYS_CYGWIN32
30: # define GETTIMEOFDAY(a, b) (gettimeofday(a, b))
31: # define SETTIMEOFDAY(a, b) (settimeofday_NT(a))
32: #else
33: # define GETTIMEOFDAY(a, b) (gettimeofday(a, b))
34: # define SETTIMEOFDAY(a, b) (settimeofday(a, b))
35: #endif
36: # endif /* SYSV_TIMEOFDAY */
37: # endif /* not (HAVE_SYS_TIMERS_H && HAVE_GETCLOCK) */
38: #endif /* SIM */
39:
40: /*
41: * Time of day conversion constant. Ntp's time scale starts in 1900,
42: * Unix in 1970.
43: */
44: #define JAN_1970 0x83aa7e80 /* 2208988800 1970 - 1900 in seconds */
45:
46: /*
47: * These constants are used to round the time stamps computed from
48: * a struct timeval to the microsecond (more or less). This keeps
49: * things neat.
50: */
51: #define TS_MASK 0xfffff000 /* mask to usec, for time stamps */
52: #define TS_ROUNDBIT 0x00000800 /* round at this bit */
53:
54:
55: /*
56: * Convert usec to a time stamp fraction. If you use this the program
57: * must include the following declarations:
58: */
59: extern u_long ustotslo[];
60: extern u_long ustotsmid[];
61: extern u_long ustotshi[];
62:
63: #define TVUTOTSF(tvu, tsf) \
64: (tsf) = ustotslo[(tvu) & 0xff] \
65: + ustotsmid[((tvu) >> 8) & 0xff] \
66: + ustotshi[((tvu) >> 16) & 0xf]
67:
68: /*
69: * Convert a struct timeval to a time stamp.
70: */
71: #define TVTOTS(tv, ts) \
72: do { \
73: (ts)->l_ui = (u_long)(tv)->tv_sec; \
74: TVUTOTSF((tv)->tv_usec, (ts)->l_uf); \
75: } while(0)
76:
77: #define sTVTOTS(tv, ts) \
78: do { \
79: int isneg = 0; \
80: long usec; \
81: (ts)->l_ui = (tv)->tv_sec; \
82: usec = (tv)->tv_usec; \
83: if (((tv)->tv_sec < 0) || ((tv)->tv_usec < 0)) { \
84: usec = -usec; \
85: (ts)->l_ui = -(ts)->l_ui; \
86: isneg = 1; \
87: } \
88: TVUTOTSF(usec, (ts)->l_uf); \
89: if (isneg) { \
90: L_NEG((ts)); \
91: } \
92: } while(0)
93:
94: /*
95: * TV_SHIFT is used to turn the table result into a usec value. To round,
96: * add in TV_ROUNDBIT before shifting
97: */
98: #define TV_SHIFT 3
99: #define TV_ROUNDBIT 0x4
100:
101:
102: /*
103: * Convert a time stamp fraction to microseconds. The time stamp
104: * fraction is assumed to be unsigned. To use this in a program, declare:
105: */
106: extern long tstouslo[];
107: extern long tstousmid[];
108: extern long tstoushi[];
109:
110: #define TSFTOTVU(tsf, tvu) \
111: (tvu) = (tstoushi[((tsf) >> 24) & 0xff] \
112: + tstousmid[((tsf) >> 16) & 0xff] \
113: + tstouslo[((tsf) >> 9) & 0x7f] \
114: + TV_ROUNDBIT) >> TV_SHIFT
115: /*
116: * Convert a time stamp to a struct timeval. The time stamp
117: * has to be positive.
118: */
119: #define TSTOTV(ts, tv) \
120: do { \
121: (tv)->tv_sec = (ts)->l_ui; \
122: TSFTOTVU((ts)->l_uf, (tv)->tv_usec); \
123: if ((tv)->tv_usec == 1000000) { \
124: (tv)->tv_sec++; \
125: (tv)->tv_usec = 0; \
126: } \
127: } while (0)
128:
129: /*
130: * Convert milliseconds to a time stamp fraction. This shouldn't be
131: * here, but it is convenient since the guys who use the definition will
132: * often be including this file anyway.
133: */
134: extern u_long msutotsflo[];
135: extern u_long msutotsfhi[];
136:
137: #define MSUTOTSF(msu, tsf) \
138: (tsf) = msutotsfhi[((msu) >> 5) & 0x1f] + msutotsflo[(msu) & 0x1f]
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