250 lines
7.2 KiB
C
250 lines
7.2 KiB
C
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
#ifdef MPE
|
|
/*
|
|
* MPE lacks adjtime(), so we define our own. But note that time slewing has
|
|
* a sub-second accuracy bug documented in SR 5003462838 which prevents ntpd
|
|
* from being able to maintain clock synch. Because of the bug, this adjtime()
|
|
* implementation as used by ntpd has a side-effect of screwing up the hardware
|
|
* PDC clock, which will need to be reset with a reboot.
|
|
*
|
|
* This problem affects all versions of MPE at the time of this writing (when
|
|
* MPE/iX 7.0 is the most current). It only causes bad things to happen when
|
|
* doing continuous clock synchronization with ntpd; note that you CAN run ntpd
|
|
* with "disable ntp" in ntp.conf if you wish to provide a time server.
|
|
*
|
|
* The one-time clock adjustment functionality of ntpdate and ntp_timeset can
|
|
* be used without screwing up the PDC clock.
|
|
*
|
|
*/
|
|
#include <time.h>
|
|
|
|
int adjtime(struct timeval *delta, struct timeval *olddelta);
|
|
|
|
int adjtime(struct timeval *delta, struct timeval *olddelta)
|
|
|
|
{
|
|
/* Documented, supported MPE system intrinsics. */
|
|
|
|
extern void GETPRIVMODE(void);
|
|
extern void GETUSERMODE(void);
|
|
|
|
/* Undocumented, unsupported MPE internal functions. */
|
|
|
|
extern long long current_correction_usecs(void);
|
|
extern long long get_time(void);
|
|
extern void get_time_change_info(long long *, char *, char *);
|
|
extern long long pdc_time(int *);
|
|
extern void set_time_correction(long long, int, int);
|
|
extern long long ticks_to_micro(long long);
|
|
|
|
long long big_sec, big_usec, new_correction = 0LL;
|
|
long long prev_correction;
|
|
|
|
if (delta != NULL) {
|
|
/* Adjustment required. Convert delta to 64-bit microseconds. */
|
|
big_sec = (long)delta->tv_sec;
|
|
big_usec = delta->tv_usec;
|
|
new_correction = (big_sec * 1000000LL) + big_usec;
|
|
}
|
|
|
|
GETPRIVMODE();
|
|
|
|
/* Determine how much of a previous correction (if any) we're interrupting. */
|
|
prev_correction = current_correction_usecs();
|
|
|
|
if (delta != NULL) {
|
|
/* Adjustment required. */
|
|
|
|
#if 0
|
|
/* Speculative code disabled until bug SR 5003462838 is fixed. This bug
|
|
prevents accurate time slewing, and indeed renders ntpd inoperable. */
|
|
|
|
if (prev_correction != 0LL) {
|
|
/* A previous adjustment did not complete. Since the PDC UTC clock was
|
|
immediately jumped at the start of the previous adjustment, we must
|
|
explicitly reset it to the value of the MPE local time clock minus the
|
|
time zone offset. */
|
|
|
|
char pwf_since_boot, recover_pwf_time;
|
|
long long offset_ticks, offset_usecs, pdc_usecs_current, pdc_usecs_wanted;
|
|
int hpe_status;
|
|
|
|
get_time_change_info(&offset_ticks, &pwf_since_boot, &recover_pwf_time);
|
|
offset_usecs = ticks_to_micro(offset_ticks);
|
|
pdc_usecs_wanted = get_time() - offset_usecs;
|
|
pdc_usecs_current = pdc_time(&hpe_status);
|
|
if (hpe_status == 0)
|
|
/* Force new PDC time by starting an extra correction. */
|
|
set_time_correction(pdc_usecs_wanted - pdc_usecs_current,0,1);
|
|
}
|
|
#endif
|
|
|
|
/* Immediately jump the PDC time to the new value, and then initiate a
|
|
gradual MPE time correction slew. */
|
|
set_time_correction(new_correction,0,1);
|
|
}
|
|
|
|
GETUSERMODE();
|
|
|
|
if (olddelta != NULL) {
|
|
/* Caller wants to know remaining amount of previous correction. */
|
|
(long)olddelta->tv_sec = prev_correction / 1000000LL;
|
|
olddelta->tv_usec = prev_correction % 1000000LL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* MPE */
|
|
|
|
#ifdef NEED_HPUX_ADJTIME
|
|
/*************************************************************************/
|
|
/* (c) Copyright Tai Jin, 1988. All Rights Reserved. */
|
|
/* Hewlett-Packard Laboratories. */
|
|
/* */
|
|
/* Permission is hereby granted for unlimited modification, use, and */
|
|
/* distribution. This software is made available with no warranty of */
|
|
/* any kind, express or implied. This copyright notice must remain */
|
|
/* intact in all versions of this software. */
|
|
/* */
|
|
/* The author would appreciate it if any bug fixes and enhancements were */
|
|
/* to be sent back to him for incorporation into future versions of this */
|
|
/* software. Please send changes to tai@iag.hp.com or ken@sdd.hp.com. */
|
|
/*************************************************************************/
|
|
|
|
/*
|
|
* Revision history
|
|
*
|
|
* 9 Jul 94 David L. Mills, Unibergity of Delabunch
|
|
* Implemented variable threshold to limit age of
|
|
* corrections; reformatted code for readability.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char RCSid[] = "adjtime.c,v 3.1 1993/07/06 01:04:42 jbj Exp";
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/ipc.h>
|
|
#include <sys/msg.h>
|
|
#include <time.h>
|
|
#include <signal.h>
|
|
#include "adjtime.h"
|
|
|
|
#define abs(x) ((x) < 0 ? -(x) : (x))
|
|
|
|
/*
|
|
* The following paramters are appropriate for an NTP adjustment
|
|
* interval of one second.
|
|
*/
|
|
#define ADJ_THRESH 200 /* initial threshold */
|
|
#define ADJ_DELTA 4 /* threshold decrement */
|
|
|
|
static long adjthresh; /* adjustment threshold */
|
|
static long saveup; /* corrections accumulator */
|
|
|
|
/*
|
|
* clear_adjtime - reset accumulator and threshold variables
|
|
*/
|
|
void
|
|
_clear_adjtime(void)
|
|
{
|
|
saveup = 0;
|
|
adjthresh = ADJ_THRESH;
|
|
}
|
|
|
|
/*
|
|
* adjtime - hp-ux copout of the standard Unix adjtime() system call
|
|
*/
|
|
int
|
|
adjtime(
|
|
register struct timeval *delta,
|
|
register struct timeval *olddelta
|
|
)
|
|
{
|
|
struct timeval newdelta;
|
|
|
|
/*
|
|
* Corrections greater than one second are done immediately.
|
|
*/
|
|
if (delta->tv_sec) {
|
|
adjthresh = ADJ_THRESH;
|
|
saveup = 0;
|
|
return(_adjtime(delta, olddelta));
|
|
}
|
|
|
|
/*
|
|
* Corrections less than one second are accumulated until
|
|
* tripping a threshold, which is initially set at ADJ_THESH and
|
|
* reduced in ADJ_DELTA steps to zero. The idea here is to
|
|
* introduce large corrections quickly, while making sure that
|
|
* small corrections are introduced without excessive delay. The
|
|
* idea comes from the ARPAnet routing update algorithm.
|
|
*/
|
|
saveup += delta->tv_usec;
|
|
if (abs(saveup) >= adjthresh) {
|
|
adjthresh = ADJ_THRESH;
|
|
newdelta.tv_sec = 0;
|
|
newdelta.tv_usec = saveup;
|
|
saveup = 0;
|
|
return(_adjtime(&newdelta, olddelta));
|
|
} else {
|
|
adjthresh -= ADJ_DELTA;
|
|
}
|
|
|
|
/*
|
|
* While nobody uses it, return the residual before correction,
|
|
* as per Unix convention.
|
|
*/
|
|
if (olddelta)
|
|
olddelta->tv_sec = olddelta->tv_usec = 0;
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* _adjtime - does the actual work
|
|
*/
|
|
int
|
|
_adjtime(
|
|
register struct timeval *delta,
|
|
register struct timeval *olddelta
|
|
)
|
|
{
|
|
register int mqid;
|
|
MsgBuf msg;
|
|
register MsgBuf *msgp = &msg;
|
|
|
|
/*
|
|
* Get the key to the adjtime message queue (note that we must
|
|
* get it every time because the queue might have been removed
|
|
* and recreated)
|
|
*/
|
|
if ((mqid = msgget(KEY, 0)) == -1)
|
|
return (-1);
|
|
msgp->msgb.mtype = CLIENT;
|
|
msgp->msgb.tv = *delta;
|
|
if (olddelta)
|
|
msgp->msgb.code = DELTA2;
|
|
else
|
|
msgp->msgb.code = DELTA1;
|
|
|
|
/*
|
|
* Tickle adjtimed and snatch residual, if indicated. Lots of
|
|
* fanatic error checking here.
|
|
*/
|
|
if (msgsnd(mqid, &msgp->msgp, MSGSIZE, 0) == -1)
|
|
return (-1);
|
|
if (olddelta) {
|
|
if (msgrcv(mqid, &msgp->msgp, MSGSIZE, SERVER, 0) == -1)
|
|
return (-1);
|
|
*olddelta = msgp->msgb.tv;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#else /* not NEED_HPUX_ADJTIME */
|
|
int adjtime_bs;
|
|
#endif /* not NEED_HPUX_ADJTIME */
|