Restore back -i, -a
This commit is contained in:
Andrey A. Chernov
parent
0729dc4924
commit
f30089ed19
@ -67,176 +67,179 @@ int main(argc, argv)
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/* Avoid time_t here, can be unsigned long or worse */
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long offset, utcsec, localsec, diff;
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time_t initial_sec, final_sec;
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int init = 1, nonex1 = 0, nonex2 = 0;
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int ch, init = -1;
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int disrtcset, need_restore = 0;
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if (argc != 1) {
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fprintf(stderr, "Usage:\tadjkerntz\n");
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return 2;
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}
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while ((ch = getopt(argc, argv, "ai")) != EOF)
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switch((char)ch) {
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case 'i': /* initial call, save offset */
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if (init != -1)
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goto usage;
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init = 1;
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break;
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case 'a': /* adjustment call, use saved offset */
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if (init != -1)
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goto usage;
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init = 0;
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break;
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default:
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usage:
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fprintf(stderr, "Usage:\n\
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\tadjkerntz -i\t(initial call from /etc/rc)\n\
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\tadjkerntz -a\t(adjustment call from crontab)\n");
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return 2;
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}
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if (init == -1)
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goto usage;
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if (access(_PATH_CLOCK, F_OK))
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return 0;
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if (daemon(0, 0)) {
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perror("daemon");
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return 1;
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}
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openlog("adjkerntz", LOG_PID|LOG_PERROR, LOG_DAEMON);
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openlog("adjkerntz", LOG_PID, LOG_DAEMON);
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/* Spy on timezone changes with 1sec accurancy */
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for (;;sleep(1)) {
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again:
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/****** Critical section, do all things as fast as possible ******/
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/* get local CMOS clock and possible kernel offset */
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if (gettimeofday(&tv, &tz)) {
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syslog(LOG_ERR, "gettimeofday: %m");
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return 1;
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}
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/* get local CMOS clock and possible kernel offset */
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if (gettimeofday(&tv, &tz)) {
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syslog(LOG_ERR, "gettimeofday: %m");
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return 1;
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}
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/* get the actual local timezone difference */
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initial_sec = tv.tv_sec;
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local = *localtime(&initial_sec);
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utc = *gmtime(&initial_sec);
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utc.tm_isdst = local.tm_isdst; /* Use current timezone for mktime(), */
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/* because it assumed local time */
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/* calculate local CMOS diff from GMT */
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utcsec = mktime(&utc);
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localsec = mktime(&local);
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if (utcsec == -1 || localsec == -1) {
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/*
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* XXX user can only control local time, and it is
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* unacceptable to fail here for init. 2:30 am in the
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* middle of the nonexistent hour means 3:30 am.
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*/
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syslog(LOG_WARNING,
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"Nonexistent local time -- will retry after %d secs", REPORT_PERIOD);
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(void) sleep(REPORT_PERIOD);
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goto again;
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}
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offset = utcsec - localsec;
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mib[0] = CTL_MACHDEP;
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mib[1] = CPU_ADJKERNTZ;
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len = sizeof(kern_offset);
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if (sysctl(mib, 2, &kern_offset, &len, NULL, 0) == -1) {
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syslog(LOG_ERR, "sysctl(get_offset): %m");
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return 1;
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}
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/* correct the kerneltime for this diffs */
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/* subtract kernel offset, if present, old offset too */
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diff = offset - tz.tz_minuteswest * 60 - kern_offset;
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if (diff != 0) {
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/* Yet one step for final time */
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final_sec = tv.tv_sec + diff;
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/* get the actual local timezone difference */
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initial_sec = tv.tv_sec;
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local = *localtime(&initial_sec);
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utc = *gmtime(&initial_sec);
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local = *localtime(&final_sec);
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utc = *gmtime(&final_sec);
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utc.tm_isdst = local.tm_isdst; /* Use current timezone for mktime(), */
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/* because it assumed local time */
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/* calculate local CMOS diff from GMT */
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utcsec = mktime(&utc);
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localsec = mktime(&local);
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if (utcsec == -1 || localsec == -1) {
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/*
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* XXX user can only control local time, and it is
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* unacceptable to fail here for init. 2:30 am in the
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* middle of the nonexistent hour means 3:30 am.
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* XXX as above. The user has even less control,
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* but perhaps we never get here.
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*/
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if (!(nonex1++ % REPORT_PERIOD)) {
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if (nonex1 > 1)
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nonex1 = 0;
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syslog(LOG_WARNING,
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"Nonexistent local time -- retry each second");
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}
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continue;
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syslog(LOG_WARNING,
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"Nonexistent (final) local time -- will retry after %d secs", REPORT_PERIOD);
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(void) sleep(REPORT_PERIOD);
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goto again;
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}
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offset = utcsec - localsec;
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mib[0] = CTL_MACHDEP;
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mib[1] = CPU_ADJKERNTZ;
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len = sizeof(kern_offset);
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if (sysctl(mib, 2, &kern_offset, &len, NULL, 0) == -1) {
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syslog(LOG_ERR, "sysctl(get_offset): %m");
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return 1;
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}
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/* correct the kerneltime for this diffs */
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/* subtract kernel offset, if present, old offset too */
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diff = offset - tz.tz_minuteswest * 60 - kern_offset;
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if (diff != 0) {
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/* Yet one step for final time */
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final_sec = tv.tv_sec + diff;
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/* get the actual local timezone difference */
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local = *localtime(&final_sec);
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utc = *gmtime(&final_sec);
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utc.tm_isdst = local.tm_isdst; /* Use current timezone for mktime(), */
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/* because it assumed local time */
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utcsec = mktime(&utc);
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localsec = mktime(&local);
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if (utcsec == -1 || localsec == -1) {
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/*
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* XXX as above. The user has even less control,
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* but perhaps we never get here.
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*/
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if (!(nonex2++ % REPORT_PERIOD)) {
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if (nonex2 > 1)
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nonex2 = 0;
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syslog(LOG_WARNING,
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"Nonexistent (final) local time -- retry each second");
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}
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continue;
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}
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offset = utcsec - localsec;
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/* correct the kerneltime for this diffs */
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/* subtract kernel offset, if present, old offset too */
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diff = offset - tz.tz_minuteswest * 60 - kern_offset;
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if (diff != 0) {
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tv.tv_sec += diff;
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tv.tv_usec = 0; /* we are restarting here... */
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stv = &tv;
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}
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else
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stv = NULL;
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tv.tv_sec += diff;
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tv.tv_usec = 0; /* we are restarting here... */
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stv = &tv;
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}
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else
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stv = NULL;
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}
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else
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stv = NULL;
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if (tz.tz_dsttime != 0 || tz.tz_minuteswest != 0) {
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tz.tz_dsttime = tz.tz_minuteswest = 0; /* zone info is garbage */
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stz = &tz;
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}
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else
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stz = NULL;
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if (tz.tz_dsttime != 0 || tz.tz_minuteswest != 0) {
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tz.tz_dsttime = tz.tz_minuteswest = 0; /* zone info is garbage */
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stz = &tz;
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}
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else
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stz = NULL;
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if (stz != NULL || stv != NULL) {
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if (init && stv != NULL) {
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mib[0] = CTL_MACHDEP;
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mib[1] = CPU_DISRTCSET;
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len = sizeof(disrtcset);
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if (sysctl(mib, 2, &disrtcset, &len, NULL, 0) == -1) {
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syslog(LOG_ERR, "sysctl(get_disrtcset): %m");
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if (stz != NULL || stv != NULL) {
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if (init && stv != NULL) {
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mib[0] = CTL_MACHDEP;
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mib[1] = CPU_DISRTCSET;
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len = sizeof(disrtcset);
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if (sysctl(mib, 2, &disrtcset, &len, NULL, 0) == -1) {
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syslog(LOG_ERR, "sysctl(get_disrtcset): %m");
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return 1;
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}
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if (disrtcset == 0) {
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disrtcset = 1;
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need_restore = 1;
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if (sysctl(mib, 2, NULL, NULL, &disrtcset, len) == -1) {
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syslog(LOG_ERR, "sysctl(set_disrtcset): %m");
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return 1;
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}
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if (disrtcset == 0) {
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disrtcset = 1;
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need_restore = 1;
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if (sysctl(mib, 2, NULL, NULL, &disrtcset, len) == -1) {
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syslog(LOG_ERR, "sysctl(set_disrtcset): %m");
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return 1;
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}
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}
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}
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/* stz means that kernel zone shifted */
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/* clock needs adjustment even if !init */
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if ((init || stz != NULL) && settimeofday(stv, stz)) {
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syslog(LOG_ERR, "settimeofday: %m");
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return 1;
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}
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}
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/* stz means that kernel zone shifted */
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/* clock needs adjustment even if !init */
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if ((init || stz != NULL) && settimeofday(stv, stz)) {
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syslog(LOG_ERR, "settimeofday: %m");
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return 1;
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}
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}
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if (kern_offset != offset) {
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kern_offset = offset;
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mib[0] = CTL_MACHDEP;
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mib[1] = CPU_ADJKERNTZ;
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len = sizeof(kern_offset);
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if (sysctl(mib, 2, NULL, NULL, &kern_offset, len) == -1) {
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syslog(LOG_ERR, "sysctl(update_offset): %m");
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return 1;
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}
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if (kern_offset != offset) {
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kern_offset = offset;
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mib[0] = CTL_MACHDEP;
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mib[1] = CPU_ADJKERNTZ;
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len = sizeof(kern_offset);
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if (sysctl(mib, 2, NULL, NULL, &kern_offset, len) == -1) {
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syslog(LOG_ERR, "sysctl(update_offset): %m");
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return 1;
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}
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}
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if (need_restore) {
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need_restore = 0;
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disrtcset = 0;
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if (sysctl(mib, 2, NULL, NULL, &disrtcset, len) == -1) {
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syslog(LOG_ERR, "sysctl(restore_disrtcset): %m");
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return 1;
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}
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if (need_restore) {
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need_restore = 0;
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disrtcset = 0;
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if (sysctl(mib, 2, NULL, NULL, &disrtcset, len) == -1) {
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syslog(LOG_ERR, "sysctl(restore_disrtcset): %m");
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return 1;
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}
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}
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/****** End of critical section ******/
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init = 0;
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}
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return 1;
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return 0;
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}
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