492 lines
12 KiB
C
492 lines
12 KiB
C
/*************************************************************************/
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/* (c) Copyright Tai Jin, 1988. All Rights Reserved. */
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/* Hewlett-Packard Laboratories. */
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/* */
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/* Permission is hereby granted for unlimited modification, use, and */
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/* distribution. This software is made available with no warranty of */
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/* any kind, express or implied. This copyright notice must remain */
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/* intact in all versions of this software. */
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/* */
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/* The author would appreciate it if any bug fixes and enhancements were */
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/* to be sent back to him for incorporation into future versions of this */
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/* software. Please send changes to tai@iag.hp.com or ken@sdd.hp.com. */
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/*************************************************************************/
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#ifndef lint
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static char RCSid[] = "adjtimed.c,v 3.1 1993/07/06 01:04:45 jbj Exp";
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#endif
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/*
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* Adjust time daemon.
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* This daemon adjusts the rate of the system clock a la BSD's adjtime().
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* The adjtime() routine uses SYSV messages to communicate with this daemon.
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*
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* Caveat: This emulation uses an undocumented kernel variable. As such, it
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* cannot be guaranteed to work in future HP-UX releases. Fortunately,
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* it will no longer be needed in HPUX 10.01 and later.
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*/
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/msg.h>
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#include <sys/lock.h>
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#include <time.h>
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#include <signal.h>
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#include <nlist.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "ntp_syslog.h"
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#include "ntp_stdlib.h"
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#include "adjtime.h"
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double atof (const char *);
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int InitClockRate (void);
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int AdjustClockRate (register struct timeval *delta, register struct timeval *olddelta);
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long GetClockRate (void);
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int SetClockRate (long);
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void ResetClockRate (void);
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void Cleanup (void);
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void Exit (int);
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#define MILLION 1000000L
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/* emacs cc-mode goes nuts if we split the next line... */
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#define tvtod(tv) ((double)tv.tv_sec + ((double)tv.tv_usec / (double)MILLION))
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char *progname = NULL;
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int verbose = 0;
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int sysdebug = 0;
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static int mqid;
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static double oldrate = 0.0;
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int
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main(
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int argc,
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char *argv[]
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)
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{
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struct timeval remains;
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struct sigvec vec;
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MsgBuf msg;
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char ch;
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int nofork = 0;
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int fd;
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progname = argv[0];
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#ifdef LOG_LOCAL6
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openlog("adjtimed", LOG_PID, LOG_LOCAL6);
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#else
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openlog("adjtimed", LOG_PID);
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#endif
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while ((ch = ntp_getopt(argc, argv, "hkrvdfp:")) != EOF) {
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switch (ch) {
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case 'k':
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case 'r':
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if ((mqid = msgget(KEY, 0)) != -1) {
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if (msgctl(mqid, IPC_RMID, (struct msqid_ds *)0) == -1) {
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msyslog(LOG_ERR, "remove old message queue: %m");
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perror("adjtimed: remove old message queue");
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exit(1);
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}
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}
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if (ch == 'k')
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exit(0);
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break;
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case 'v':
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++verbose, nofork = 1;
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break;
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case 'd':
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++sysdebug;
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break;
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case 'f':
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nofork = 1;
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break;
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case 'p':
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fputs("adjtimed: -p option ignored\n", stderr);
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break;
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default:
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puts("usage: adjtimed -hkrvdf");
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puts("-h\thelp");
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puts("-k\tkill existing adjtimed, if any");
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puts("-r\trestart (kills existing adjtimed, if any)");
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puts("-v\tdebug output (repeat for more output)");
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puts("-d\tsyslog output (repeat for more output)");
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puts("-f\tno fork");
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msyslog(LOG_ERR, "usage error");
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exit(1);
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} /* switch */
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} /* while */
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if (!nofork) {
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switch (fork()) {
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case 0:
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close(fileno(stdin));
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close(fileno(stdout));
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close(fileno(stderr));
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#ifdef TIOCNOTTY
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if ((fd = open("/dev/tty")) != -1) {
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ioctl(fd, TIOCNOTTY, 0);
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close(fd);
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}
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#else
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setpgrp();
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#endif
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break;
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case -1:
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msyslog(LOG_ERR, "fork: %m");
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perror("adjtimed: fork");
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exit(1);
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default:
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exit(0);
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} /* switch */
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} /* if */
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if (nofork) {
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setvbuf(stdout, NULL, _IONBF, BUFSIZ);
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setvbuf(stderr, NULL, _IONBF, BUFSIZ);
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}
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msyslog(LOG_INFO, "started");
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if (verbose) printf("adjtimed: started\n");
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if (InitClockRate() == -1)
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Exit(2);
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(void)signal(SIGHUP, SIG_IGN);
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(void)signal(SIGINT, SIG_IGN);
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(void)signal(SIGQUIT, SIG_IGN);
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(void)signal(SIGTERM, Cleanup);
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vec.sv_handler = ResetClockRate;
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vec.sv_flags = 0;
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vec.sv_mask = ~0;
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sigvector(SIGALRM, &vec, (struct sigvec *)0);
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if (msgget(KEY, IPC_CREAT|IPC_EXCL) == -1) {
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if (errno == EEXIST) {
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msyslog(LOG_ERR, "message queue already exists, use -r to remove it");
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fputs("adjtimed: message queue already exists, use -r to remove it\n",
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stderr);
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Exit(1);
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}
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msyslog(LOG_ERR, "create message queue: %m");
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perror("adjtimed: create message queue");
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Exit(1);
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}
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if ((mqid = msgget(KEY, 0)) == -1) {
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msyslog(LOG_ERR, "get message queue id: %m");
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perror("adjtimed: get message queue id");
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Exit(1);
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}
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/* Lock process in memory to improve response time */
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if (plock(PROCLOCK)) {
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msyslog(LOG_ERR, "plock: %m");
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perror("adjtimed: plock");
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Cleanup();
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}
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/* Also raise process priority.
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* If we do not get run when we want, this leads to bad timekeeping
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* and "Previous time adjustment didn't complete" gripes from xntpd.
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*/
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if (nice(-10) == -1) {
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msyslog(LOG_ERR, "nice: %m");
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perror("adjtimed: nice");
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Cleanup();
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}
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for (;;) {
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if (msgrcv(mqid, &msg.msgp, MSGSIZE, CLIENT, 0) == -1) {
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if (errno == EINTR) continue;
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msyslog(LOG_ERR, "read message: %m");
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perror("adjtimed: read message");
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Cleanup();
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}
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switch (msg.msgb.code) {
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case DELTA1:
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case DELTA2:
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AdjustClockRate(&msg.msgb.tv, &remains);
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if (msg.msgb.code == DELTA2) {
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msg.msgb.tv = remains;
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msg.msgb.mtype = SERVER;
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while (msgsnd(mqid, &msg.msgp, MSGSIZE, 0) == -1) {
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if (errno == EINTR) continue;
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msyslog(LOG_ERR, "send message: %m");
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perror("adjtimed: send message");
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Cleanup();
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}
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}
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if (remains.tv_sec + remains.tv_usec != 0L) {
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if (verbose) {
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printf("adjtimed: previous correction remaining %.6fs\n",
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tvtod(remains));
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}
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if (sysdebug) {
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msyslog(LOG_INFO, "previous correction remaining %.6fs",
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tvtod(remains));
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}
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}
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break;
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default:
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fprintf(stderr, "adjtimed: unknown message code %d\n", msg.msgb.code);
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msyslog(LOG_ERR, "unknown message code %d", msg.msgb.code);
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} /* switch */
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} /* loop */
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} /* main */
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/*
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* Default clock rate (old_tick).
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*/
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#define DEFAULT_RATE (MILLION / HZ)
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#define UNKNOWN_RATE 0L
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#define TICK_ADJ 5 /* standard adjustment rate, microsec/tick */
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static long default_rate = DEFAULT_RATE;
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static long tick_rate = HZ; /* ticks per sec */
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static long slew_rate = TICK_ADJ * HZ; /* in microsec/sec */
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int
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AdjustClockRate(
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register struct timeval *delta,
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register struct timeval *olddelta
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)
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{
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register long rate, dt, leftover;
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struct itimerval period, remains;
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dt = (delta->tv_sec * MILLION) + delta->tv_usec;
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if (verbose)
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printf("adjtimed: new correction %.6fs\n", (double)dt / (double)MILLION);
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if (sysdebug)
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msyslog(LOG_INFO, "new correction %.6fs", (double)dt / (double)MILLION);
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if (verbose > 2) printf("adjtimed: leftover %ldus\n", leftover);
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if (sysdebug > 2) msyslog(LOG_INFO, "leftover %ldus", leftover);
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rate = dt;
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/*
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* Apply a slew rate of slew_rate over a period of dt/slew_rate seconds.
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*/
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if (dt > 0) {
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rate = slew_rate;
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} else {
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rate = -slew_rate;
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dt = -dt;
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}
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period.it_value.tv_sec = dt / slew_rate;
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period.it_value.tv_usec = (dt % slew_rate) * (MILLION / slew_rate);
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/*
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* Note: we assume the kernel will convert the specified period into ticks
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* using the modified clock rate rather than an assumed nominal clock rate,
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* and therefore will generate the timer interrupt after the specified
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* number of true seconds, not skewed seconds.
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*/
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if (verbose > 1)
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printf("adjtimed: will be complete in %lds %ldus\n",
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period.it_value.tv_sec, period.it_value.tv_usec);
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if (sysdebug > 1)
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msyslog(LOG_INFO, "will be complete in %lds %ldus",
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period.it_value.tv_sec, period.it_value.tv_usec);
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/*
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* adjust the clock rate
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*/
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if (dt) {
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if (SetClockRate((rate / tick_rate) + default_rate) == -1) {
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msyslog(LOG_ERR, "set clock rate: %m");
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perror("adjtimed: set clock rate");
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}
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}
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/*
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* start the timer
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* (do this after changing the rate because the period has been rounded down)
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*/
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period.it_interval.tv_sec = period.it_interval.tv_usec = 0L;
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setitimer(ITIMER_REAL, &period, &remains);
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/*
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* return old delta
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*/
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if (olddelta) {
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dt = ((remains.it_value.tv_sec * MILLION) + remains.it_value.tv_usec) *
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oldrate;
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olddelta->tv_sec = dt / MILLION;
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olddelta->tv_usec = dt - (olddelta->tv_sec * MILLION);
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}
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oldrate = (double)rate / (double)MILLION;
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return(0);
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} /* AdjustClockRate */
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static struct nlist nl[] = {
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#ifdef __hp9000s800
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#ifdef PRE7_0
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{ "tick" },
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#else
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{ "old_tick" },
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#endif
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#else
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{ "_old_tick" },
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#endif
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{ "" }
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};
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static int kmem;
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/*
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* The return value is the clock rate in old_tick units or -1 if error.
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*/
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long
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GetClockRate(void)
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{
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long rate, mask;
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if (lseek(kmem, (off_t)nl[0].n_value, 0) == -1L)
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return (-1L);
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mask = sigblock(sigmask(SIGALRM));
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if (read(kmem, (caddr_t)&rate, sizeof(rate)) != sizeof(rate))
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rate = UNKNOWN_RATE;
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sigsetmask(mask);
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return (rate);
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} /* GetClockRate */
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/*
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* The argument is the new rate in old_tick units.
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*/
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int
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SetClockRate(
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long rate
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)
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{
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long mask;
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if (lseek(kmem, (off_t)nl[0].n_value, 0) == -1L)
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return (-1);
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mask = sigblock(sigmask(SIGALRM));
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if (write(kmem, (caddr_t)&rate, sizeof(rate)) != sizeof(rate)) {
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sigsetmask(mask);
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return (-1);
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}
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sigsetmask(mask);
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if (rate != default_rate) {
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if (verbose > 3) {
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printf("adjtimed: clock rate (%lu) %ldus/s\n", rate,
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(rate - default_rate) * tick_rate);
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}
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if (sysdebug > 3) {
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msyslog(LOG_INFO, "clock rate (%lu) %ldus/s", rate,
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(rate - default_rate) * tick_rate);
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}
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}
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return (0);
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} /* SetClockRate */
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int
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InitClockRate(void)
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{
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if ((kmem = open("/dev/kmem", O_RDWR)) == -1) {
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msyslog(LOG_ERR, "open(/dev/kmem): %m");
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perror("adjtimed: open(/dev/kmem)");
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return (-1);
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}
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nlist("/hp-ux", nl);
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if (nl[0].n_type == 0) {
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fputs("adjtimed: /hp-ux has no symbol table\n", stderr);
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msyslog(LOG_ERR, "/hp-ux has no symbol table");
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return (-1);
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}
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/*
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* Set the default to the system's original value
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*/
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default_rate = GetClockRate();
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if (default_rate == UNKNOWN_RATE) default_rate = DEFAULT_RATE;
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tick_rate = (MILLION / default_rate);
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slew_rate = TICK_ADJ * tick_rate;
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fprintf(stderr,"default_rate=%ld, tick_rate=%ld, slew_rate=%ld\n",default_rate,tick_rate,slew_rate);
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return (0);
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} /* InitClockRate */
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/*
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* Reset the clock rate to the default value.
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*/
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void
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ResetClockRate(void)
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{
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struct itimerval it;
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it.it_value.tv_sec = it.it_value.tv_usec = 0L;
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setitimer(ITIMER_REAL, &it, (struct itimerval *)0);
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if (verbose > 2) puts("adjtimed: resetting the clock");
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if (sysdebug > 2) msyslog(LOG_INFO, "resetting the clock");
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if (GetClockRate() != default_rate) {
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if (SetClockRate(default_rate) == -1) {
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msyslog(LOG_ERR, "set clock rate: %m");
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perror("adjtimed: set clock rate");
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}
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}
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oldrate = 0.0;
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} /* ResetClockRate */
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void
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Cleanup(void)
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{
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ResetClockRate();
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if (msgctl(mqid, IPC_RMID, (struct msqid_ds *)0) == -1) {
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if (errno != EINVAL) {
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msyslog(LOG_ERR, "remove message queue: %m");
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perror("adjtimed: remove message queue");
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}
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}
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Exit(2);
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} /* Cleanup */
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void
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Exit(status)
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int status;
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{
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msyslog(LOG_ERR, "terminated");
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closelog();
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if (kmem != -1) close(kmem);
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exit(status);
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} /* Exit */
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