572 lines
14 KiB
C
572 lines
14 KiB
C
/*
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* systime -- routines to fiddle a UNIX clock.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#ifdef HAVE_SYS_PARAM_H
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# include <sys/param.h>
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#endif
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#ifdef HAVE_UTMP_H
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# include <utmp.h>
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#endif /* HAVE_UTMP_H */
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#ifdef HAVE_UTMPX_H
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# include <utmpx.h>
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#endif /* HAVE_UTMPX_H */
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#include "ntp_fp.h"
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#include "ntp_syslog.h"
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#include "ntp_unixtime.h"
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#include "ntp_stdlib.h"
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#if defined(GDT_SURVEYING)
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l_fp gdt_rsadj; /* running sum of adjustments to time */
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#endif
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#if defined(STEP_SLEW)
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# define SLEWALWAYS
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#endif
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extern int debug;
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int allow_set_backward;
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/*
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* These routines (init_systime, get_systime, step_systime, adj_systime)
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* implement an interface between the (more or less) system independent
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* bits of NTP and the peculiarities of dealing with the Unix system
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* clock. These routines will run with good precision fairly independently
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* of your kernel's value of tickadj. I couldn't tell the difference
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* between tickadj==40 and tickadj==5 on a microvax, though I prefer
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* to set tickadj == 500/hz when in doubt. At your option you
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* may compile this so that your system's clock is always slewed to the
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* correct time even for large corrections. Of course, all of this takes
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* a lot of code which wouldn't be needed with a reasonable tickadj and
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* a willingness to let the clock be stepped occasionally. Oh well.
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*/
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/*
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* Clock variables. We round calls to adjtime() to adj_precision
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* microseconds, and limit the adjustment to tvu_maxslew microseconds
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* (tsf_maxslew fractional sec) in one adjustment interval. As we are
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* thus limited in the speed and precision with which we can adjust the
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* clock, we compensate by keeping the known "error" in the system time
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* in sys_clock_offset. This is added to timestamps returned by get_systime().
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* We also remember the clock precision we computed from the kernel in
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* case someone asks us.
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*/
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long sys_clock;
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long adj_precision; /* adj precision in usec (tickadj) */
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long tvu_maxslew; /* maximum adjust doable in 1 second */
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u_long tsf_maxslew; /* same as above, as long format */
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l_fp sys_clock_offset; /* correction for current system time */
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#ifdef SYS_WINNT
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/*
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* number of 100 nanosecond units added to the clock at each tick
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* determined by GetSystemTimeAdjustment() in clock_parms()
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*/
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long units_per_tick;
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#endif /* SYS_WINNT */
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/*
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* get_systime - return the system time in timestamp format
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* As a side effect, update sys_clock.
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*/
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void
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get_systime(now)
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l_fp *now;
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{
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struct timeval tv;
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#ifdef HAVE_GETCLOCK
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struct timespec ts;
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#endif
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/*
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* Get the time of day, convert to time stamp format
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* and add in the current time offset. Then round
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* appropriately.
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*/
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#ifdef HAVE_GETCLOCK
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(void) getclock(TIMEOFDAY, &ts);
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tv.tv_sec = ts.tv_sec;
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tv.tv_usec = ts.tv_nsec / 1000;
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#else /* not HAVE_GETCLOCK */
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(void) GETTIMEOFDAY(&tv, (struct timezone *)0);
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#endif /* not HAVE_GETCLOCK */
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TVTOTS(&tv, now);
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L_ADD(now, &sys_clock_offset);
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if (now->l_uf & TS_ROUNDBIT)
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L_ADDUF(now, TS_ROUNDBIT);
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now->l_ui += JAN_1970;
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now->l_uf &= TS_MASK;
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sys_clock = now->l_ui;
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}
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/*
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* step_systime - do a step adjustment in the system time (at least from
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* NTP's point of view.
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*/
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int
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step_systime(now)
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l_fp *now;
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{
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register u_long tmp_ui;
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register u_long tmp_uf;
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int isneg;
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#ifdef STEP_SLEW
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int n;
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#endif
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/*
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* Take the absolute value of the offset
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*/
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tmp_ui = now->l_ui;
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tmp_uf = now->l_uf;
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if (M_ISNEG(tmp_ui, tmp_uf)) {
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M_NEG(tmp_ui, tmp_uf);
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isneg = 1;
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} else
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isneg = 0;
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#ifdef SLEWALWAYS
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#ifdef STEP_SLEW
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if (tmp_ui >= 3) { /* Step it and slew we might win */
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n = step_systime_real(now);
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if (!n) return n;
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if (isneg)
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now->l_ui = ~0;
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else
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now->l_ui = ~0;
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}
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#endif
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/*
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* Just add adjustment into the current offset. The update
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* routine will take care of bringing the system clock into
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* line.
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*/
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L_ADD(&sys_clock_offset, now);
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#if defined(GDT_SURVEYING)
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L_ADD(&gdt_rsadj, now);
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#endif
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return 1;
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#else /* SLEWALWAYS */
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#ifdef DEBUG
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if (debug > 2)
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printf ("allow_set_backward=%d\n",allow_set_backward);
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#endif
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if (isneg && !allow_set_backward) {
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L_ADD(&sys_clock_offset, now);
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return 1;
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}
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else {
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#ifdef DEBUG
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if (debug > 2)
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printf ("calling step_systime_real from not slewalways\n");
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#endif
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return step_systime_real(now);
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}
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#endif /* SLEWALWAYS */
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}
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int max_no_complete = 20;
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/*
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* adj_systime - called once every second to make system time adjustments.
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*/
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int
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adj_systime(now)
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l_fp *now;
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{
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register u_long offset_i, offset_f;
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register long temp;
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register u_long residual;
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register int isneg = 0;
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struct timeval adjtv;
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#ifndef SYS_WINNT
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struct timeval oadjtv;
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l_fp oadjts;
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#endif
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long adj = now->l_f;
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int rval;
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#ifdef SYS_WINNT
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DWORD dwTimeAdjustment;
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#endif /* SYS_WINNT */
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#if defined(GDT_SURVEYING)
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/* add to record of increments */
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M_ADDF(gdt_rsadj.l_ui, gdt_rsadj.l_uf, adj);
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#endif
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#ifdef DEBUG
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if (debug > 4)
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printf("systime: offset %s\n", lfptoa(now, 6));
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#endif
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/*
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* Move the current offset into the registers
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*/
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offset_i = sys_clock_offset.l_ui;
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offset_f = sys_clock_offset.l_uf;
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/*
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* Add the new adjustment into the system offset. Adjust the
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* system clock to minimize this.
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*/
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M_ADDF(offset_i, offset_f, adj);
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if (M_ISNEG(offset_i, offset_f)) {
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isneg = 1;
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M_NEG(offset_i, offset_f);
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}
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adjtv.tv_sec = 0;
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if (offset_i > 0 || offset_f >= tsf_maxslew) {
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/*
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* Slew is bigger than we can complete in
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* the adjustment interval. Make a maximum
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* sized slew and reduce sys_clock_offset by this
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* much.
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*/
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M_SUBUF(offset_i, offset_f, tsf_maxslew);
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if (!isneg) {
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#ifndef SYS_WINNT
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adjtv.tv_usec = tvu_maxslew;
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#else
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dwTimeAdjustment = units_per_tick + tvu_maxslew / adj_precision;
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#endif /* SYS_WINNT */
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} else {
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#ifndef SYS_WINNT
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adjtv.tv_usec = -tvu_maxslew;
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#else
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dwTimeAdjustment = units_per_tick - tvu_maxslew / adj_precision;
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#endif /* SYS_WINNT */
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M_NEG(offset_i, offset_f);
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}
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#ifdef DEBUG
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if (debug > 4)
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printf("systime: maximum slew: %s%s, remainder = %s\n",
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isneg?"-":"", umfptoa(0, tsf_maxslew, 9),
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mfptoa(offset_i, offset_f, 9));
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#endif
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} else {
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/*
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* We can do this slew in the time period. Do our
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* best approximation (rounded), save residual for
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* next adjustment.
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*
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* Note that offset_i is guaranteed to be 0 here.
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*/
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TSFTOTVU(offset_f, temp);
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#ifndef ADJTIME_IS_ACCURATE
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/*
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* Round value to be an even multiple of adj_precision
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*/
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residual = temp % adj_precision;
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temp -= residual;
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if ( (long) (residual << 1) >= adj_precision)
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temp += adj_precision;
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#endif /* ADJTIME_IS_ACCURATE */
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TVUTOTSF(temp, residual);
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M_SUBUF(offset_i, offset_f, residual);
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if (isneg) {
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#ifndef SYS_WINNT
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adjtv.tv_usec = -temp;
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#else
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dwTimeAdjustment = units_per_tick - temp / adj_precision;
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#endif /* SYS_WINNT */
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M_NEG(offset_i, offset_f);
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} else {
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#ifndef SYS_WINNT
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adjtv.tv_usec = temp;
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#else
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dwTimeAdjustment = units_per_tick + temp / adj_precision;
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#endif /* SYS_WINNT */
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}
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#ifdef DEBUG
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if (debug > 4)
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#ifndef SYS_WINNT
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printf(
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"systime: adjtv = %s sec, adjts = %s sec, sys_clock_offset = %s sec\n",
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tvtoa(&adjtv), umfptoa(0, residual, 6),
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mfptoa(offset_i, offset_f, 6));
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#else
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printf(
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"systime: dwTimeAdjustment = %d, sys_clock_offset = %s sec\n",
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dwTimeAdjustment, mfptoa(offset_i, offset_f, 6));
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#endif /* SYS_WINNT */
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#endif /* DEBUG */
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}
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/*
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* Here we do the actual adjustment. If for some reason the adjtime()
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* call fails, like it is not implemented or something like that,
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* we honk to the log. If the previous adjustment did not complete,
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* we correct the residual offset and honk to the log, but only for
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* a little while.
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*/
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if (
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#ifndef SYS_WINNT
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(adjtime(&adjtv, &oadjtv) < 0)
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#else
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(!SetSystemTimeAdjustment(dwTimeAdjustment, FALSE))
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#endif /* SYS_WINNT */
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) {
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msyslog(LOG_ERR, "Can't adjust time: %m");
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rval = 0;
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} else {
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sys_clock_offset.l_ui = offset_i;
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sys_clock_offset.l_uf = offset_f;
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rval = 1;
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#ifndef SYS_WINNT
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if (oadjtv.tv_sec != 0 || oadjtv.tv_usec != 0) {
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sTVTOTS(&oadjtv, &oadjts);
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L_ADD(&sys_clock_offset, &oadjts);
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#if defined(GDT_SURVEYING)
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L_ADD(&gdt_rsadj, &oadjts);
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#endif
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if (max_no_complete > 0) {
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max_no_complete--;
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NLOG(NLOG_SYSSTATUS|NLOG_SYNCSTATUS)
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msyslog(LOG_WARNING,
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"Previous time adjustment incomplete; residual %s sec\n",
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lfptoa(&oadjts, 6));
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}
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}
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#endif /* SYS_WINNT */
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}
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return(rval);
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}
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/*
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* This is used by ntpdate even when xntpd does not use it! WLJ
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*/
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int
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step_systime_real(now)
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l_fp *now;
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{
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struct timeval timetv, adjtv, oldtimetv;
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int isneg = 0;
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#if defined(HAVE_GETCLOCK) || defined(HAVE_CLOCK_SETTIME)
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struct timespec ts;
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#endif
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#if DEBUG
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if (debug)
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printf("step_systime: offset %s sys_offset %s\n",
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lfptoa(now, 6), lfptoa(&sys_clock_offset, 6));
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#endif
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/*
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* We can afford to be sloppy here since if this is called
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* the time is really screwed and everything is being reset.
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*/
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L_ADD(&sys_clock_offset, now);
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#if defined(GDT_SURVEYING)
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L_ADD(&gdt_rsadj, now);
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#endif
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if (L_ISNEG(&sys_clock_offset)) {
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isneg = 1;
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L_NEG(&sys_clock_offset);
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}
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TSTOTV(&sys_clock_offset, &adjtv);
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#ifdef HAVE_GETCLOCK
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(void) getclock(TIMEOFDAY, &ts);
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timetv.tv_sec = ts.tv_sec;
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timetv.tv_usec = ts.tv_nsec / 1000;
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#else /* not HAVE_GETCLOCK */
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(void) GETTIMEOFDAY(&timetv, (struct timezone *)0);
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#endif /* not HAVE_GETCLOCK */
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oldtimetv = timetv;
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#ifdef DEBUG
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if (debug)
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printf("step: %s sec, sys_clock_offset = %s sec, adjtv = %s sec, timetv = %s sec\n",
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lfptoa(now, 6), lfptoa(&sys_clock_offset, 6), tvtoa(&adjtv),
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utvtoa(&timetv));
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#endif
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if (isneg) {
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timetv.tv_sec -= adjtv.tv_sec;
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timetv.tv_usec -= adjtv.tv_usec;
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if (timetv.tv_usec < 0) {
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timetv.tv_sec--;
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timetv.tv_usec += 1000000;
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}
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} else {
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timetv.tv_sec += adjtv.tv_sec;
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timetv.tv_usec += adjtv.tv_usec;
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if (timetv.tv_usec >= 1000000) {
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timetv.tv_sec++;
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timetv.tv_usec -= 1000000;
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}
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}
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#ifdef DEBUG
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if (debug)
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printf("step: old timetv = %s sec\n", utvtoa(&timetv));
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#endif
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#if HAVE_CLOCK_SETTIME
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ts.tv_sec = timetv.tv_sec;
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ts.tv_nsec = timetv.tv_usec * 1000;
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#endif /* HAVE_CLOCK_SETTIME */
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if (
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#if HAVE_CLOCK_SETTIME
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(clock_settime(CLOCK_REALTIME, &ts) != 0)
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#else /* HAVE_CLOCK_SETTIME */
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(SETTIMEOFDAY(&timetv, (struct timezone *)0) != 0)
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#endif /* HAVE_CLOCK_SETTIME */
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) {
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msyslog(LOG_ERR, "Can't set time of day: %m");
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return (0);
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}
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#if DEBUG
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if (debug) {
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GETTIMEOFDAY(&timetv, (struct timezone *) 0);
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printf("step: new timetv = %s sec\n", utvtoa(&timetv));
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}
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#endif
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L_CLR(&sys_clock_offset);
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#ifdef NEED_HPUX_ADJTIME
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/*
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* CHECKME: is this correct when called by ntpdate?????
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*/
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_clear_adjtime();
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#endif
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/*
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* FreeBSD, for example, has:
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* struct utmp {
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* char ut_line[UT_LINESIZE];
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* char ut_name[UT_NAMESIZE];
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* char ut_host[UT_HOSTSIZE];
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* long ut_time;
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* };
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* and appends line="|", name="date", host="", time for the OLD
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* and appends line="{", name="date", host="", time for the NEW
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* to _PATH_WTMP .
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*
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* Some OSes have utmp, some have utmpx.
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*/
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/*
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* Write old and new time entries in utmp and wtmp if step adjustment
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* is greater than one second.
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*
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* This might become even Uglier...
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*/
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if (oldtimetv.tv_sec != timetv.tv_sec)
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{
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#ifdef HAVE_UTMP_H
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struct utmp ut;
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#endif
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#ifdef HAVE_UTMPX_H
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struct utmpx utx;
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#endif
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#ifdef HAVE_UTMP_H
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memset((char *)&ut, 0, sizeof(ut));
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#endif
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#ifdef HAVE_UTMPX_H
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memset((char *)&utx, 0, sizeof(utx));
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#endif
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/* UTMP */
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#ifdef UPDATE_UTMP
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# ifdef HAVE_PUTUTLINE
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ut.ut_type = OLD_TIME;
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(void)strcpy(ut.ut_line, OTIME_MSG);
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ut.ut_time = oldtimetv.tv_sec;
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pututline(&ut);
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setutent();
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ut.ut_type = NEW_TIME;
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(void)strcpy(ut.ut_line, NTIME_MSG);
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ut.ut_time = timetv.tv_sec;
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pututline(&ut);
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endutent();
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# else /* not HAVE_PUTUTLINE */
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# endif /* not HAVE_PUTUTLINE */
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#endif /* UPDATE_UTMP */
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/* UTMPX */
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#ifdef UPDATE_UTMPX
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# ifdef HAVE_PUTUTXLINE
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utx.ut_type = OLD_TIME;
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(void)strcpy(utx.ut_line, OTIME_MSG);
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utx.ut_tv = oldtimetv;
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pututxline(&utx);
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setutxent();
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utx.ut_type = NEW_TIME;
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(void)strcpy(utx.ut_line, NTIME_MSG);
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utx.ut_tv = timetv;
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pututxline(&utx);
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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);
|
|
}
|