1/*
2 * Copyright (C) 1993-1998 by Andrey A. Chernov, Moscow, Russia.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#ifndef lint
28static const char copyright[] =
29"@(#)Copyright (C) 1993-1996 by Andrey A. Chernov, Moscow, Russia.\n\
30 All rights reserved.\n";
31#endif /* not lint */
32
33#ifndef lint
34static const char rcsid[] =
35 "$FreeBSD: head/sbin/adjkerntz/adjkerntz.c 50476 1999-08-28 00:22:10Z peter $";
36#endif /* not lint */
37
38/*
39 * Andrey A. Chernov <ache@astral.msk.su> Dec 20 1993
40 *
41 * Fix kernel time value if machine run wall CMOS clock
42 * (and /etc/wall_cmos_clock file present)
43 * using zoneinfo rules or direct TZ environment variable set.
44 * Use Joerg Wunsch idea for seconds accurate offset calculation
45 * with Garrett Wollman and Bruce Evans fixes.
46 *
47 */
48#include <stdio.h>
49#include <signal.h>
50#include <stdlib.h>
51#include <unistd.h>
52#include <syslog.h>
53#include <sys/time.h>
54#include <sys/param.h>
55#include <machine/cpu.h>
56#include <sys/sysctl.h>
57
58#include "pathnames.h"
59
60/*#define DEBUG*/
61
62#define True (1)
63#define False (0)
64#define Unknown (-1)
65
66#define REPORT_PERIOD (30*60)
67
68static void usage __P((void));
69
70void fake() {}
71
72int main(argc, argv)
73 int argc;
74 char **argv;
75{
76 struct tm local;
77 struct timeval tv, *stv;
78 struct timezone tz, *stz;
79 int kern_offset, wall_clock, disrtcset;
80 size_t len;
81 int mib[2];
82 /* Avoid time_t here, can be unsigned long or worse */
83 long offset, localsec, diff;
84 time_t initial_sec, final_sec;
85 int ch;
86 int initial_isdst = -1, final_isdst;
87 int need_restore = False, sleep_mode = False, looping,
88 init = Unknown;
89 sigset_t mask, emask;
90
91 while ((ch = getopt(argc, argv, "ais")) != -1)
92 switch((char)ch) {
93 case 'i': /* initial call, save offset */
94 if (init != Unknown)
95 usage();
96 init = True;
97 break;
98 case 'a': /* adjustment call, use saved offset */
99 if (init != Unknown)
100 usage();
101 init = False;
102 break;
103 case 's':
104 sleep_mode = True;
105 break;
106 default:
107 usage();
108 }
109 if (init == Unknown)
110 usage();
111
112 if (access(_PATH_CLOCK, F_OK) != 0)
113 return 0;
114
115 if (init)
116 sleep_mode = True;
117
118 sigemptyset(&mask);
119 sigemptyset(&emask);
120 sigaddset(&mask, SIGTERM);
121
122 openlog("adjkerntz", LOG_PID|LOG_PERROR, LOG_DAEMON);
123
124 (void) signal(SIGHUP, SIG_IGN);
125
126 if (init && daemon(0, 1)) {
127 syslog(LOG_ERR, "daemon: %m");
128 return 1;
129 }
130
131again:
132 (void) sigprocmask(SIG_BLOCK, &mask, NULL);
133 (void) signal(SIGTERM, fake);
134
135 diff = 0;
136 stv = NULL;
137 stz = NULL;
138 looping = False;
139
140 wall_clock = (access(_PATH_CLOCK, F_OK) == 0);
141 if (init && !sleep_mode) {
142 init = False;
143 if (!wall_clock)
144 return 0;
145 }
146
147 mib[0] = CTL_MACHDEP;
148 mib[1] = CPU_ADJKERNTZ;
149 len = sizeof(kern_offset);
150 if (sysctl(mib, 2, &kern_offset, &len, NULL, 0) == -1) {
151 syslog(LOG_ERR, "sysctl(get_offset): %m");
152 return 1;
153 }
154
155/****** Critical section, do all things as fast as possible ******/
156
157 /* get local CMOS clock and possible kernel offset */
158 if (gettimeofday(&tv, &tz)) {
159 syslog(LOG_ERR, "gettimeofday: %m");
160 return 1;
161 }
162
163 /* get the actual local timezone difference */
164 initial_sec = tv.tv_sec;
165
166recalculate:
167 local = *localtime(&initial_sec);
168 if (diff == 0)
169 initial_isdst = local.tm_isdst;
170 local.tm_isdst = initial_isdst;
171
172 /* calculate local CMOS diff from GMT */
173
174 localsec = mktime(&local);
175 if (localsec == -1) {
176 /*
177 * XXX user can only control local time, and it is
178 * unacceptable to fail here for init. 2:30 am in the
179 * middle of the nonexistent hour means 3:30 am.
180 */
181 if (!sleep_mode) {
182 syslog(LOG_WARNING,
183 "Warning: nonexistent local time, try to run later.");
184 syslog(LOG_WARNING, "Giving up.");
185 return 1;
186 }
187 syslog(LOG_WARNING,
188 "Warning: nonexistent local time.");
189 syslog(LOG_WARNING, "Will retry after %d minutes.",
190 REPORT_PERIOD / 60);
191 (void) signal(SIGTERM, SIG_DFL);
192 (void) sigprocmask(SIG_UNBLOCK, &mask, NULL);
193 (void) sleep(REPORT_PERIOD);
194 goto again;
195 }
196 offset = -local.tm_gmtoff;
197#ifdef DEBUG
198 fprintf(stderr, "Initial offset: %ld secs\n", offset);
199#endif
200
201 /* correct the kerneltime for this diffs */
202 /* subtract kernel offset, if present, old offset too */
203
204 diff = offset - tz.tz_minuteswest * 60 - kern_offset;
205
206 if (diff != 0) {
207#ifdef DEBUG
208 fprintf(stderr, "Initial diff: %ld secs\n", diff);
209#endif
210 /* Yet one step for final time */
211
212 final_sec = initial_sec + diff;
213
214 /* get the actual local timezone difference */
215 local = *localtime(&final_sec);
216 final_isdst = diff < 0 ? initial_isdst : local.tm_isdst;
217 if (diff > 0 && initial_isdst != final_isdst) {
218 if (looping)
219 goto bad_final;
220 looping = True;
221 initial_isdst = final_isdst;
222 goto recalculate;
223 }
224 local.tm_isdst = final_isdst;
225
226 localsec = mktime(&local);
227 if (localsec == -1) {
228 bad_final:
229 /*
230 * XXX as above. The user has even less control,
231 * but perhaps we never get here.
232 */
233 if (!sleep_mode) {
234 syslog(LOG_WARNING,
235 "Warning: nonexistent final local time, try to run later.");
236 syslog(LOG_WARNING, "Giving up.");
237 return 1;
238 }
239 syslog(LOG_WARNING,
240 "Warning: nonexistent final local time.");
241 syslog(LOG_WARNING, "Will retry after %d minutes.",
242 REPORT_PERIOD / 60);
243 (void) signal(SIGTERM, SIG_DFL);
244 (void) sigprocmask(SIG_UNBLOCK, &mask, NULL);
245 (void) sleep(REPORT_PERIOD);
246 goto again;
247 }
248 offset = -local.tm_gmtoff;
249#ifdef DEBUG
250 fprintf(stderr, "Final offset: %ld secs\n", offset);
251#endif
252
253 /* correct the kerneltime for this diffs */
254 /* subtract kernel offset, if present, old offset too */
255
256 diff = offset - tz.tz_minuteswest * 60 - kern_offset;
257
258 if (diff != 0) {
259#ifdef DEBUG
260 fprintf(stderr, "Final diff: %ld secs\n", diff);
261#endif
262 /*
263 * stv is abused as a flag. The important value
264 * is in `diff'.
265 */
266 stv = &tv;
267 }
268 }
269
270 if (tz.tz_dsttime != 0 || tz.tz_minuteswest != 0) {
271 tz.tz_dsttime = tz.tz_minuteswest = 0; /* zone info is garbage */
272 stz = &tz;
273 }
274 if (!wall_clock && stz == NULL)
275 stv = NULL;
276
277 /* if init or UTC clock and offset/date will be changed, */
278 /* disable RTC modification for a while. */
279
280 if ( (init && stv != NULL)
281 || ((init || !wall_clock) && kern_offset != offset)
282 ) {
283 mib[0] = CTL_MACHDEP;
284 mib[1] = CPU_DISRTCSET;
285 len = sizeof(disrtcset);
286 if (sysctl(mib, 2, &disrtcset, &len, NULL, 0) == -1) {
287 syslog(LOG_ERR, "sysctl(get_disrtcset): %m");
288 return 1;
289 }
290 if (disrtcset == 0) {
291 disrtcset = 1;
292 need_restore = True;
293 if (sysctl(mib, 2, NULL, NULL, &disrtcset, len) == -1) {
294 syslog(LOG_ERR, "sysctl(set_disrtcset): %m");
295 return 1;
296 }
297 }
298 }
299
300 if ( (init && (stv != NULL || stz != NULL))
301 || (stz != NULL && stv == NULL)
302 ) {
303 if (stv != NULL) {
304 /*
305 * Get the time again, as close as possible to
306 * adjusting it, to minimise drift.
307 * XXX we'd better not fail between here and
308 * restoring disrtcset, since we don't clean up
309 * anything.
310 */
311 if (gettimeofday(&tv, (struct timezone *)NULL)) {
312 syslog(LOG_ERR, "gettimeofday: %m");
313 return 1;
314 }
315 tv.tv_sec += diff;
316 stv = &tv;
317 }
318 if (settimeofday(stv, stz)) {
319 syslog(LOG_ERR, "settimeofday: %m");
320 return 1;
321 }
322 }
323
324 /* setting CPU_ADJKERNTZ have a side effect: resettodr(), which */
325 /* can be disabled by CPU_DISRTCSET, so if init or UTC clock */
326 /* -- don't write RTC, else write RTC. */
327
328 if (kern_offset != offset) {
329 kern_offset = offset;
330 mib[0] = CTL_MACHDEP;
331 mib[1] = CPU_ADJKERNTZ;
332 len = sizeof(kern_offset);
333 if (sysctl(mib, 2, NULL, NULL, &kern_offset, len) == -1) {
334 syslog(LOG_ERR, "sysctl(update_offset): %m");
335 return 1;
336 }
337 }
338
339 mib[0] = CTL_MACHDEP;
340 mib[1] = CPU_WALLCLOCK;
341 len = sizeof(wall_clock);
342 if (sysctl(mib, 2, NULL, NULL, &wall_clock, len) == -1) {
343 syslog(LOG_ERR, "sysctl(put_wallclock): %m");
344 return 1;
345 }
346
347 if (need_restore) {
348 need_restore = False;
349 mib[0] = CTL_MACHDEP;
350 mib[1] = CPU_DISRTCSET;
351 disrtcset = 0;
352 len = sizeof(disrtcset);
353 if (sysctl(mib, 2, NULL, NULL, &disrtcset, len) == -1) {
354 syslog(LOG_ERR, "sysctl(restore_disrtcset): %m");
355 return 1;
356 }
357 }
358
359/****** End of critical section ******/
360
361 if (init && wall_clock) {
362 sleep_mode = False;
363 /* wait for signals and acts like -a */
364 (void) sigsuspend(&emask);
365 goto again;
366 }
367
368 return 0;
369}
370
371static void
372usage()
373{
374 fprintf(stderr, "%s\n%s\n%s\n%s\n",
375 "usage: adjkerntz -i",
376 "\t\t(initial call from /etc/rc)",
377 " adjkerntz -a [-s]",
378 "\t\t(adjustment call, -s for sleep/retry mode)");
379 exit(2);
380}
2 * Copyright (C) 1993-1998 by Andrey A. Chernov, Moscow, Russia.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#ifndef lint
28static const char copyright[] =
29"@(#)Copyright (C) 1993-1996 by Andrey A. Chernov, Moscow, Russia.\n\
30 All rights reserved.\n";
31#endif /* not lint */
32
33#ifndef lint
34static const char rcsid[] =
35 "$FreeBSD: head/sbin/adjkerntz/adjkerntz.c 50476 1999-08-28 00:22:10Z peter $";
36#endif /* not lint */
37
38/*
39 * Andrey A. Chernov <ache@astral.msk.su> Dec 20 1993
40 *
41 * Fix kernel time value if machine run wall CMOS clock
42 * (and /etc/wall_cmos_clock file present)
43 * using zoneinfo rules or direct TZ environment variable set.
44 * Use Joerg Wunsch idea for seconds accurate offset calculation
45 * with Garrett Wollman and Bruce Evans fixes.
46 *
47 */
48#include <stdio.h>
49#include <signal.h>
50#include <stdlib.h>
51#include <unistd.h>
52#include <syslog.h>
53#include <sys/time.h>
54#include <sys/param.h>
55#include <machine/cpu.h>
56#include <sys/sysctl.h>
57
58#include "pathnames.h"
59
60/*#define DEBUG*/
61
62#define True (1)
63#define False (0)
64#define Unknown (-1)
65
66#define REPORT_PERIOD (30*60)
67
68static void usage __P((void));
69
70void fake() {}
71
72int main(argc, argv)
73 int argc;
74 char **argv;
75{
76 struct tm local;
77 struct timeval tv, *stv;
78 struct timezone tz, *stz;
79 int kern_offset, wall_clock, disrtcset;
80 size_t len;
81 int mib[2];
82 /* Avoid time_t here, can be unsigned long or worse */
83 long offset, localsec, diff;
84 time_t initial_sec, final_sec;
85 int ch;
86 int initial_isdst = -1, final_isdst;
87 int need_restore = False, sleep_mode = False, looping,
88 init = Unknown;
89 sigset_t mask, emask;
90
91 while ((ch = getopt(argc, argv, "ais")) != -1)
92 switch((char)ch) {
93 case 'i': /* initial call, save offset */
94 if (init != Unknown)
95 usage();
96 init = True;
97 break;
98 case 'a': /* adjustment call, use saved offset */
99 if (init != Unknown)
100 usage();
101 init = False;
102 break;
103 case 's':
104 sleep_mode = True;
105 break;
106 default:
107 usage();
108 }
109 if (init == Unknown)
110 usage();
111
112 if (access(_PATH_CLOCK, F_OK) != 0)
113 return 0;
114
115 if (init)
116 sleep_mode = True;
117
118 sigemptyset(&mask);
119 sigemptyset(&emask);
120 sigaddset(&mask, SIGTERM);
121
122 openlog("adjkerntz", LOG_PID|LOG_PERROR, LOG_DAEMON);
123
124 (void) signal(SIGHUP, SIG_IGN);
125
126 if (init && daemon(0, 1)) {
127 syslog(LOG_ERR, "daemon: %m");
128 return 1;
129 }
130
131again:
132 (void) sigprocmask(SIG_BLOCK, &mask, NULL);
133 (void) signal(SIGTERM, fake);
134
135 diff = 0;
136 stv = NULL;
137 stz = NULL;
138 looping = False;
139
140 wall_clock = (access(_PATH_CLOCK, F_OK) == 0);
141 if (init && !sleep_mode) {
142 init = False;
143 if (!wall_clock)
144 return 0;
145 }
146
147 mib[0] = CTL_MACHDEP;
148 mib[1] = CPU_ADJKERNTZ;
149 len = sizeof(kern_offset);
150 if (sysctl(mib, 2, &kern_offset, &len, NULL, 0) == -1) {
151 syslog(LOG_ERR, "sysctl(get_offset): %m");
152 return 1;
153 }
154
155/****** Critical section, do all things as fast as possible ******/
156
157 /* get local CMOS clock and possible kernel offset */
158 if (gettimeofday(&tv, &tz)) {
159 syslog(LOG_ERR, "gettimeofday: %m");
160 return 1;
161 }
162
163 /* get the actual local timezone difference */
164 initial_sec = tv.tv_sec;
165
166recalculate:
167 local = *localtime(&initial_sec);
168 if (diff == 0)
169 initial_isdst = local.tm_isdst;
170 local.tm_isdst = initial_isdst;
171
172 /* calculate local CMOS diff from GMT */
173
174 localsec = mktime(&local);
175 if (localsec == -1) {
176 /*
177 * XXX user can only control local time, and it is
178 * unacceptable to fail here for init. 2:30 am in the
179 * middle of the nonexistent hour means 3:30 am.
180 */
181 if (!sleep_mode) {
182 syslog(LOG_WARNING,
183 "Warning: nonexistent local time, try to run later.");
184 syslog(LOG_WARNING, "Giving up.");
185 return 1;
186 }
187 syslog(LOG_WARNING,
188 "Warning: nonexistent local time.");
189 syslog(LOG_WARNING, "Will retry after %d minutes.",
190 REPORT_PERIOD / 60);
191 (void) signal(SIGTERM, SIG_DFL);
192 (void) sigprocmask(SIG_UNBLOCK, &mask, NULL);
193 (void) sleep(REPORT_PERIOD);
194 goto again;
195 }
196 offset = -local.tm_gmtoff;
197#ifdef DEBUG
198 fprintf(stderr, "Initial offset: %ld secs\n", offset);
199#endif
200
201 /* correct the kerneltime for this diffs */
202 /* subtract kernel offset, if present, old offset too */
203
204 diff = offset - tz.tz_minuteswest * 60 - kern_offset;
205
206 if (diff != 0) {
207#ifdef DEBUG
208 fprintf(stderr, "Initial diff: %ld secs\n", diff);
209#endif
210 /* Yet one step for final time */
211
212 final_sec = initial_sec + diff;
213
214 /* get the actual local timezone difference */
215 local = *localtime(&final_sec);
216 final_isdst = diff < 0 ? initial_isdst : local.tm_isdst;
217 if (diff > 0 && initial_isdst != final_isdst) {
218 if (looping)
219 goto bad_final;
220 looping = True;
221 initial_isdst = final_isdst;
222 goto recalculate;
223 }
224 local.tm_isdst = final_isdst;
225
226 localsec = mktime(&local);
227 if (localsec == -1) {
228 bad_final:
229 /*
230 * XXX as above. The user has even less control,
231 * but perhaps we never get here.
232 */
233 if (!sleep_mode) {
234 syslog(LOG_WARNING,
235 "Warning: nonexistent final local time, try to run later.");
236 syslog(LOG_WARNING, "Giving up.");
237 return 1;
238 }
239 syslog(LOG_WARNING,
240 "Warning: nonexistent final local time.");
241 syslog(LOG_WARNING, "Will retry after %d minutes.",
242 REPORT_PERIOD / 60);
243 (void) signal(SIGTERM, SIG_DFL);
244 (void) sigprocmask(SIG_UNBLOCK, &mask, NULL);
245 (void) sleep(REPORT_PERIOD);
246 goto again;
247 }
248 offset = -local.tm_gmtoff;
249#ifdef DEBUG
250 fprintf(stderr, "Final offset: %ld secs\n", offset);
251#endif
252
253 /* correct the kerneltime for this diffs */
254 /* subtract kernel offset, if present, old offset too */
255
256 diff = offset - tz.tz_minuteswest * 60 - kern_offset;
257
258 if (diff != 0) {
259#ifdef DEBUG
260 fprintf(stderr, "Final diff: %ld secs\n", diff);
261#endif
262 /*
263 * stv is abused as a flag. The important value
264 * is in `diff'.
265 */
266 stv = &tv;
267 }
268 }
269
270 if (tz.tz_dsttime != 0 || tz.tz_minuteswest != 0) {
271 tz.tz_dsttime = tz.tz_minuteswest = 0; /* zone info is garbage */
272 stz = &tz;
273 }
274 if (!wall_clock && stz == NULL)
275 stv = NULL;
276
277 /* if init or UTC clock and offset/date will be changed, */
278 /* disable RTC modification for a while. */
279
280 if ( (init && stv != NULL)
281 || ((init || !wall_clock) && kern_offset != offset)
282 ) {
283 mib[0] = CTL_MACHDEP;
284 mib[1] = CPU_DISRTCSET;
285 len = sizeof(disrtcset);
286 if (sysctl(mib, 2, &disrtcset, &len, NULL, 0) == -1) {
287 syslog(LOG_ERR, "sysctl(get_disrtcset): %m");
288 return 1;
289 }
290 if (disrtcset == 0) {
291 disrtcset = 1;
292 need_restore = True;
293 if (sysctl(mib, 2, NULL, NULL, &disrtcset, len) == -1) {
294 syslog(LOG_ERR, "sysctl(set_disrtcset): %m");
295 return 1;
296 }
297 }
298 }
299
300 if ( (init && (stv != NULL || stz != NULL))
301 || (stz != NULL && stv == NULL)
302 ) {
303 if (stv != NULL) {
304 /*
305 * Get the time again, as close as possible to
306 * adjusting it, to minimise drift.
307 * XXX we'd better not fail between here and
308 * restoring disrtcset, since we don't clean up
309 * anything.
310 */
311 if (gettimeofday(&tv, (struct timezone *)NULL)) {
312 syslog(LOG_ERR, "gettimeofday: %m");
313 return 1;
314 }
315 tv.tv_sec += diff;
316 stv = &tv;
317 }
318 if (settimeofday(stv, stz)) {
319 syslog(LOG_ERR, "settimeofday: %m");
320 return 1;
321 }
322 }
323
324 /* setting CPU_ADJKERNTZ have a side effect: resettodr(), which */
325 /* can be disabled by CPU_DISRTCSET, so if init or UTC clock */
326 /* -- don't write RTC, else write RTC. */
327
328 if (kern_offset != offset) {
329 kern_offset = offset;
330 mib[0] = CTL_MACHDEP;
331 mib[1] = CPU_ADJKERNTZ;
332 len = sizeof(kern_offset);
333 if (sysctl(mib, 2, NULL, NULL, &kern_offset, len) == -1) {
334 syslog(LOG_ERR, "sysctl(update_offset): %m");
335 return 1;
336 }
337 }
338
339 mib[0] = CTL_MACHDEP;
340 mib[1] = CPU_WALLCLOCK;
341 len = sizeof(wall_clock);
342 if (sysctl(mib, 2, NULL, NULL, &wall_clock, len) == -1) {
343 syslog(LOG_ERR, "sysctl(put_wallclock): %m");
344 return 1;
345 }
346
347 if (need_restore) {
348 need_restore = False;
349 mib[0] = CTL_MACHDEP;
350 mib[1] = CPU_DISRTCSET;
351 disrtcset = 0;
352 len = sizeof(disrtcset);
353 if (sysctl(mib, 2, NULL, NULL, &disrtcset, len) == -1) {
354 syslog(LOG_ERR, "sysctl(restore_disrtcset): %m");
355 return 1;
356 }
357 }
358
359/****** End of critical section ******/
360
361 if (init && wall_clock) {
362 sleep_mode = False;
363 /* wait for signals and acts like -a */
364 (void) sigsuspend(&emask);
365 goto again;
366 }
367
368 return 0;
369}
370
371static void
372usage()
373{
374 fprintf(stderr, "%s\n%s\n%s\n%s\n",
375 "usage: adjkerntz -i",
376 "\t\t(initial call from /etc/rc)",
377 " adjkerntz -a [-s]",
378 "\t\t(adjustment call, -s for sleep/retry mode)");
379 exit(2);
380}