diff options
Diffstat (limited to 'usr.sbin/xntpd/include/ntp_unixtime.h')
-rw-r--r-- | usr.sbin/xntpd/include/ntp_unixtime.h | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/usr.sbin/xntpd/include/ntp_unixtime.h b/usr.sbin/xntpd/include/ntp_unixtime.h new file mode 100644 index 0000000..c1ab573 --- /dev/null +++ b/usr.sbin/xntpd/include/ntp_unixtime.h @@ -0,0 +1,119 @@ +/* ntp_unixtime.h,v 3.1 1993/07/06 01:07:02 jbj Exp + * ntp_unixtime.h - contains constants and macros for converting between + * NTP time stamps (l_fp) and Unix times (struct timeval) + */ + +#include "ntp_types.h" +#include <sys/time.h> + +/* gettimeofday() takes two args in BSD and only one in SYSV */ +#ifdef SYSV_TIMEOFDAY +# define GETTIMEOFDAY(a, b) (gettimeofday(a)) +# define SETTIMEOFDAY(a, b) (settimeofday(a)) +#else /* ! SYSV_TIMEOFDAY */ +# define GETTIMEOFDAY(a, b) (gettimeofday(a, b)) +# define SETTIMEOFDAY(a, b) (settimeofday(a, b)) +#endif /* SYSV_TIMEOFDAY */ + +/* + * Time of day conversion constant. Ntp's time scale starts in 1900, + * Unix in 1970. + */ +#define JAN_1970 0x83aa7e80 /* 2208988800 1970 - 1900 in seconds */ + +/* + * These constants are used to round the time stamps computed from + * a struct timeval to the microsecond (more or less). This keeps + * things neat. + */ +#define TS_MASK 0xfffff000 /* mask to usec, for time stamps */ +#define TS_ROUNDBIT 0x00000800 /* round at this bit */ + + +/* + * Convert usec to a time stamp fraction. If you use this the program + * must include the following declarations: + */ +extern U_LONG ustotslo[]; +extern U_LONG ustotsmid[]; +extern U_LONG ustotshi[]; + +#define TVUTOTSF(tvu, tsf) \ + (tsf) = ustotslo[(tvu) & 0xff] \ + + ustotsmid[((tvu) >> 8) & 0xff] \ + + ustotshi[((tvu) >> 16) & 0xf] + +/* + * Convert a struct timeval to a time stamp. + */ +#define TVTOTS(tv, ts) \ + do { \ + (ts)->l_ui = (unsigned LONG)(tv)->tv_sec; \ + TVUTOTSF((tv)->tv_usec, (ts)->l_uf); \ + } while(0) + +#define sTVTOTS(tv, ts) \ + do { \ + int isneg = 0; \ + LONG usec; \ + (ts)->l_ui = (tv)->tv_sec; \ + usec = (tv)->tv_usec; \ + if (((tv)->tv_sec < 0) || ((tv)->tv_usec < 0)) { \ + usec = -usec; \ + (ts)->l_ui = -(ts)->l_ui; \ + isneg = 1; \ + } \ + TVUTOTSF(usec, (ts)->l_uf); \ + if (isneg) { \ + L_NEG((ts)); \ + } \ + } while(0) + +/* + * TV_SHIFT is used to turn the table result into a usec value. To round, + * add in TV_ROUNDBIT before shifting + */ +#define TV_SHIFT 3 +#define TV_ROUNDBIT 0x4 + + +/* + * Convert a time stamp fraction to microseconds. The time stamp + * fraction is assumed to be unsigned. To use this in a program, declare: + */ +extern LONG tstouslo[]; +extern LONG tstousmid[]; +extern LONG tstoushi[]; + +#define TSFTOTVU(tsf, tvu) \ + (tvu) = (tstoushi[((tsf) >> 24) & 0xff] \ + + tstousmid[((tsf) >> 16) & 0xff] \ + + tstouslo[((tsf) >> 9) & 0x7f] \ + + TV_ROUNDBIT) >> TV_SHIFT +/* + * Convert a time stamp to a struct timeval. The time stamp + * has to be positive. + */ +#define TSTOTV(ts, tv) \ + do { \ + (tv)->tv_sec = (ts)->l_ui; \ + TSFTOTVU((ts)->l_uf, (tv)->tv_usec); \ + if ((tv)->tv_usec == 1000000) { \ + (tv)->tv_sec++; \ + (tv)->tv_usec = 0; \ + } \ + } while (0) + +/* + * Convert milliseconds to a time stamp fraction. This shouldn't be + * here, but it is convenient since the guys who use the definition will + * often be including this file anyway. + */ +extern U_LONG msutotsflo[]; +extern U_LONG msutotsfhi[]; + +#define MSUTOTSF(msu, tsf) \ + (tsf) = msutotsfhi[((msu) >> 5) & 0x1f] + msutotsflo[(msu) & 0x1f] + +extern char * tvtoa P((const struct timeval *)); +extern char * utvtoa P((const struct timeval *)); |