int
step_systime(
double step
)
{
time_t pivot; /* for ntp era unfolding */
struct timeval timetv, tvlast, tvdiff;
struct timespec timets;
struct calendar jd;
l_fp fp_ofs, fp_sys; /* offset and target system time in FP */
/*
* Get pivot time for NTP era unfolding. Since we don't step
* very often, we can afford to do the whole calculation from
* scratch. And we're not in the time-critical path yet.
*/
#if SIZEOF_TIME_T > 4
/*
* This code makes sure the resulting time stamp for the new
* system time is in the 2^32 seconds starting at 1970-01-01,
* 00:00:00 UTC.
*/
pivot = 0x80000000;
#if USE_COMPILETIME_PIVOT
/*
* Add the compile time minus 10 years to get a possible target
* area of (compile time - 10 years) to (compile time + 126
* years). This should be sufficient for a given binary of
* NTPD.
*/
if (ntpcal_get_build_date(&jd)) {
jd.year -= 10;
pivot += ntpcal_date_to_time(&jd);
} else {
msyslog(LOG_ERR,
"step-systime: assume 1970-01-01 as build date");
}
#else
UNUSED_LOCAL(jd);
#endif /* USE_COMPILETIME_PIVOT */
#else
UNUSED_LOCAL(jd);
/* This makes sure the resulting time stamp is on or after
* 1969-12-31/23:59:59 UTC and gives us additional two years,
* from the change of NTP era in 2036 to the UNIX rollover in
* 2038. (Minus one second, but that won't hurt.) We *really*
* need a longer 'time_t' after that! Or a different baseline,
* but that would cause other serious trouble, too.
*/
pivot = 0x7FFFFFFF;
#endif
/* get the complete jump distance as l_fp */
DTOLFP(sys_residual, &fp_sys);
DTOLFP(step, &fp_ofs);
L_ADD(&fp_ofs, &fp_sys);
/* ---> time-critical path starts ---> */
/* get the current time as l_fp (without fuzz) and as struct timeval */
get_ostime(&timets);
fp_sys = tspec_stamp_to_lfp(timets);
tvlast.tv_sec = timets.tv_sec;
tvlast.tv_usec = (timets.tv_nsec + 500) / 1000;
/* get the target time as l_fp */
L_ADD(&fp_sys, &fp_ofs);
/* unfold the new system time */
timetv = lfp_stamp_to_tval(fp_sys, &pivot);
/* now set new system time */
if (ntp_set_tod(&timetv, NULL) != 0) {
msyslog(LOG_ERR, "step-systime: %m");
return FALSE;
}
/* <--- time-critical path ended with 'ntp_set_tod()' <--- */
sys_residual = 0;
lamport_violated = (step < 0);
if (step_callback)
(*step_callback)();
#ifdef NEED_HPUX_ADJTIME
/*
* CHECKME: is this correct when called by ntpdate?????
*/
_clear_adjtime();
#endif
/*
* FreeBSD, for example, has:
* struct utmp {
* char ut_line[UT_LINESIZE];
* char ut_name[UT_NAMESIZE];
* char ut_host[UT_HOSTSIZE];
* long ut_time;
* };
* and appends line="|", name="date", host="", time for the OLD
* and appends line="{", name="date", host="", time for the NEW
* to _PATH_WTMP .
*
* Some OSes have utmp, some have utmpx.
*/
/*
* Write old and new time entries in utmp and wtmp if step
* adjustment is greater than one second.
*
* This might become even Uglier...
*/
tvdiff = abs_tval(sub_tval(timetv, tvlast));
if (tvdiff.tv_sec > 0) {
#ifdef HAVE_UTMP_H
struct utmp ut;
#endif
#ifdef HAVE_UTMPX_H
struct utmpx utx;
#endif
#ifdef HAVE_UTMP_H
ZERO(ut);
#endif
#ifdef HAVE_UTMPX_H
ZERO(utx);
#endif
/* UTMP */
#ifdef UPDATE_UTMP
# ifdef HAVE_PUTUTLINE
# ifndef _PATH_UTMP
# define _PATH_UTMP UTMP_FILE
# endif
utmpname(_PATH_UTMP);
ut.ut_type = OLD_TIME;
strlcpy(ut.ut_line, OTIME_MSG, sizeof(ut.ut_line));
ut.ut_time = tvlast.tv_sec;
setutent();
pututline(&ut);
ut.ut_type = NEW_TIME;
strlcpy(ut.ut_line, NTIME_MSG, sizeof(ut.ut_line));
ut.ut_time = timetv.tv_sec;
setutent();
pututline(&ut);
endutent();
# else /* not HAVE_PUTUTLINE */
# endif /* not HAVE_PUTUTLINE */
#endif /* UPDATE_UTMP */
/* UTMPX */
#ifdef UPDATE_UTMPX
# ifdef HAVE_PUTUTXLINE
utx.ut_type = OLD_TIME;
strlcpy(utx.ut_line, OTIME_MSG, sizeof(utx.ut_line));
utx.ut_tv = tvlast;
setutxent();
pututxline(&utx);
utx.ut_type = NEW_TIME;
strlcpy(utx.ut_line, NTIME_MSG, sizeof(utx.ut_line));
utx.ut_tv = timetv;
setutxent();
pututxline(&utx);
endutxent();
# else /* not HAVE_PUTUTXLINE */
# endif /* not HAVE_PUTUTXLINE */
#endif /* UPDATE_UTMPX */
/* WTMP */
#ifdef UPDATE_WTMP
# ifdef HAVE_PUTUTLINE
# ifndef _PATH_WTMP
# define _PATH_WTMP WTMP_FILE
# endif
utmpname(_PATH_WTMP);
ut.ut_type = OLD_TIME;
strlcpy(ut.ut_line, OTIME_MSG, sizeof(ut.ut_line));
ut.ut_time = tvlast.tv_sec;
setutent();
pututline(&ut);
ut.ut_type = NEW_TIME;
strlcpy(ut.ut_line, NTIME_MSG, sizeof(ut.ut_line));
ut.ut_time = timetv.tv_sec;
setutent();
pututline(&ut);
endutent();
# else /* not HAVE_PUTUTLINE */
# endif /* not HAVE_PUTUTLINE */
#endif /* UPDATE_WTMP */
/* WTMPX */
#ifdef UPDATE_WTMPX
# ifdef HAVE_PUTUTXLINE
utx.ut_type = OLD_TIME;
utx.ut_tv = tvlast;
strlcpy(utx.ut_line, OTIME_MSG, sizeof(utx.ut_line));
# ifdef HAVE_UPDWTMPX
updwtmpx(WTMPX_FILE, &utx);
# else /* not HAVE_UPDWTMPX */
# endif /* not HAVE_UPDWTMPX */
# else /* not HAVE_PUTUTXLINE */
# endif /* not HAVE_PUTUTXLINE */
# ifdef HAVE_PUTUTXLINE
utx.ut_type = NEW_TIME;
utx.ut_tv = timetv;
strlcpy(utx.ut_line, NTIME_MSG, sizeof(utx.ut_line));
# ifdef HAVE_UPDWTMPX
updwtmpx(WTMPX_FILE, &utx);
# else /* not HAVE_UPDWTMPX */
# endif /* not HAVE_UPDWTMPX */
# else /* not HAVE_PUTUTXLINE */
# endif /* not HAVE_PUTUTXLINE */
#endif /* UPDATE_WTMPX */
}
return TRUE;
}
/*
* step_systime - step the system clock.
*/
int
step_systime(
double now
)
{
struct timeval timetv, adjtv, oldtimetv;
int isneg = 0;
double dtemp;
#if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_GETCLOCK)
struct timespec ts;
#endif
dtemp = sys_residual + now;
if (dtemp < 0) {
isneg = 1;
dtemp = - dtemp;
adjtv.tv_sec = (int32)dtemp;
adjtv.tv_usec = (u_int32)((dtemp - (double)adjtv.tv_sec) *
1e6 + .5);
} else {
adjtv.tv_sec = (int32)dtemp;
adjtv.tv_usec = (u_int32)((dtemp - (double)adjtv.tv_sec) *
1e6 + .5);
}
#if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_GETCLOCK)
#ifdef HAVE_CLOCK_GETTIME
(void) clock_gettime(CLOCK_REALTIME, &ts);
#else
(void) getclock(TIMEOFDAY, &ts);
#endif
timetv.tv_sec = ts.tv_sec;
timetv.tv_usec = ts.tv_nsec / 1000;
#else /* not HAVE_GETCLOCK */
(void) GETTIMEOFDAY(&timetv, (struct timezone *)0);
#endif /* not HAVE_GETCLOCK */
oldtimetv = timetv;
#ifdef DEBUG
if (debug)
printf("step_systime: step %.6f residual %.6f\n", now, sys_residual);
#endif
if (isneg) {
timetv.tv_sec -= adjtv.tv_sec;
timetv.tv_usec -= adjtv.tv_usec;
if (timetv.tv_usec < 0) {
timetv.tv_sec--;
timetv.tv_usec += 1000000;
}
} else {
timetv.tv_sec += adjtv.tv_sec;
timetv.tv_usec += adjtv.tv_usec;
if (timetv.tv_usec >= 1000000) {
timetv.tv_sec++;
timetv.tv_usec -= 1000000;
}
}
if (ntp_set_tod(&timetv, (struct timezone *)0) != 0) {
msyslog(LOG_ERR, "Can't set time of day: %m");
return (0);
}
sys_residual = 0;
#ifdef NEED_HPUX_ADJTIME
/*
* CHECKME: is this correct when called by ntpdate?????
*/
_clear_adjtime();
#endif
/*
* FreeBSD, for example, has:
* struct utmp {
* char ut_line[UT_LINESIZE];
* char ut_name[UT_NAMESIZE];
* char ut_host[UT_HOSTSIZE];
* long ut_time;
* };
* and appends line="|", name="date", host="", time for the OLD
* and appends line="{", name="date", host="", time for the NEW
* to _PATH_WTMP .
*
* Some OSes have utmp, some have utmpx.
*/
/*
* Write old and new time entries in utmp and wtmp if step adjustment
* is greater than one second.
*
* This might become even Uglier...
*/
if (oldtimetv.tv_sec != timetv.tv_sec)
{
#ifdef HAVE_UTMP_H
struct utmp ut;
#endif
#ifdef HAVE_UTMPX_H
struct utmpx utx;
#endif
#ifdef HAVE_UTMP_H
memset((char *)&ut, 0, sizeof(ut));
#endif
#ifdef HAVE_UTMPX_H
memset((char *)&utx, 0, sizeof(utx));
#endif
/* UTMP */
#ifdef UPDATE_UTMP
# ifdef HAVE_PUTUTLINE
ut.ut_type = OLD_TIME;
(void)strcpy(ut.ut_line, OTIME_MSG);
ut.ut_time = oldtimetv.tv_sec;
pututline(&ut);
setutent();
ut.ut_type = NEW_TIME;
(void)strcpy(ut.ut_line, NTIME_MSG);
ut.ut_time = timetv.tv_sec;
pututline(&ut);
endutent();
# else /* not HAVE_PUTUTLINE */
# endif /* not HAVE_PUTUTLINE */
#endif /* UPDATE_UTMP */
/* UTMPX */
#ifdef UPDATE_UTMPX
# ifdef HAVE_PUTUTXLINE
utx.ut_type = OLD_TIME;
(void)strcpy(utx.ut_line, OTIME_MSG);
utx.ut_tv = oldtimetv;
pututxline(&utx);
setutxent();
utx.ut_type = NEW_TIME;
(void)strcpy(utx.ut_line, NTIME_MSG);
utx.ut_tv = timetv;
pututxline(&utx);
endutxent();
# else /* not HAVE_PUTUTXLINE */
# endif /* not HAVE_PUTUTXLINE */
#endif /* UPDATE_UTMPX */
/* WTMP */
#ifdef UPDATE_WTMP
# ifdef HAVE_PUTUTLINE
utmpname(WTMP_FILE);
ut.ut_type = OLD_TIME;
(void)strcpy(ut.ut_line, OTIME_MSG);
ut.ut_time = oldtimetv.tv_sec;
pututline(&ut);
ut.ut_type = NEW_TIME;
(void)strcpy(ut.ut_line, NTIME_MSG);
ut.ut_time = timetv.tv_sec;
pututline(&ut);
endutent();
# else /* not HAVE_PUTUTLINE */
# endif /* not HAVE_PUTUTLINE */
#endif /* UPDATE_WTMP */
/* WTMPX */
#ifdef UPDATE_WTMPX
# ifdef HAVE_PUTUTXLINE
utx.ut_type = OLD_TIME;
utx.ut_tv = oldtimetv;
(void)strcpy(utx.ut_line, OTIME_MSG);
# ifdef HAVE_UPDWTMPX
updwtmpx(WTMPX_FILE, &utx);
# else /* not HAVE_UPDWTMPX */
# endif /* not HAVE_UPDWTMPX */
# else /* not HAVE_PUTUTXLINE */
# endif /* not HAVE_PUTUTXLINE */
# ifdef HAVE_PUTUTXLINE
utx.ut_type = NEW_TIME;
utx.ut_tv = timetv;
(void)strcpy(utx.ut_line, NTIME_MSG);
# ifdef HAVE_UPDWTMPX
updwtmpx(WTMPX_FILE, &utx);
# else /* not HAVE_UPDWTMPX */
# endif /* not HAVE_UPDWTMPX */
# else /* not HAVE_PUTUTXLINE */
# endif /* not HAVE_PUTUTXLINE */
#endif /* UPDATE_WTMPX */
}
return (1);
}
