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[] =
| 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[] =
|
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}
| 79int main(argc, argv)
80 int argc;
81 char **argv;
82{
83 struct tm local;
84 struct timeval tv, *stv;
85 struct timezone tz, *stz;
86 int kern_offset, wall_clock, disrtcset;
87 size_t len;
88 int mib[2];
89 /* Avoid time_t here, can be unsigned long or worse */
90 long offset, localsec, diff;
91 time_t initial_sec, final_sec;
92 int ch;
93 int initial_isdst = -1, final_isdst;
94 int need_restore = False, sleep_mode = False, looping,
95 init = Unknown;
96 sigset_t mask, emask;
97
98 while ((ch = getopt(argc, argv, "ais")) != -1)
99 switch((char)ch) {
100 case 'i': /* initial call, save offset */
101 if (init != Unknown)
102 usage();
103 init = True;
104 break;
105 case 'a': /* adjustment call, use saved offset */
106 if (init != Unknown)
107 usage();
108 init = False;
109 break;
110 case 's':
111 sleep_mode = True;
112 break;
113 default:
114 usage();
115 }
116 if (init == Unknown)
117 usage();
118
119 if (access(_PATH_CLOCK, F_OK) != 0)
120 return 0;
121
122 if (init)
123 sleep_mode = True;
124
125 sigemptyset(&mask);
126 sigemptyset(&emask);
127 sigaddset(&mask, SIGTERM);
128
129 openlog("adjkerntz", LOG_PID|LOG_PERROR, LOG_DAEMON);
130
131 (void) signal(SIGHUP, SIG_IGN);
132
133 if (init && daemon(0, 1)) {
134 syslog(LOG_ERR, "daemon: %m");
135 return 1;
136 }
137
138again:
139 (void) sigprocmask(SIG_BLOCK, &mask, NULL);
140 (void) signal(SIGTERM, fake);
141
142 diff = 0;
143 stv = NULL;
144 stz = NULL;
145 looping = False;
146
147 wall_clock = (access(_PATH_CLOCK, F_OK) == 0);
148 if (init && !sleep_mode) {
149 init = False;
150 if (!wall_clock)
151 return 0;
152 }
153
154 mib[0] = CTL_MACHDEP;
155 mib[1] = CPU_ADJKERNTZ;
156 len = sizeof(kern_offset);
157 if (sysctl(mib, 2, &kern_offset, &len, NULL, 0) == -1) {
158 syslog(LOG_ERR, "sysctl(get_offset): %m");
159 return 1;
160 }
161
162/****** Critical section, do all things as fast as possible ******/
163
164 /* get local CMOS clock and possible kernel offset */
165 if (gettimeofday(&tv, &tz)) {
166 syslog(LOG_ERR, "gettimeofday: %m");
167 return 1;
168 }
169
170 /* get the actual local timezone difference */
171 initial_sec = tv.tv_sec;
172
173recalculate:
174 local = *localtime(&initial_sec);
175 if (diff == 0)
176 initial_isdst = local.tm_isdst;
177 local.tm_isdst = initial_isdst;
178
179 /* calculate local CMOS diff from GMT */
180
181 localsec = mktime(&local);
182 if (localsec == -1) {
183 /*
184 * XXX user can only control local time, and it is
185 * unacceptable to fail here for init. 2:30 am in the
186 * middle of the nonexistent hour means 3:30 am.
187 */
188 if (!sleep_mode) {
189 syslog(LOG_WARNING,
190 "Warning: nonexistent local time, try to run later.");
191 syslog(LOG_WARNING, "Giving up.");
192 return 1;
193 }
194 syslog(LOG_WARNING,
195 "Warning: nonexistent local time.");
196 syslog(LOG_WARNING, "Will retry after %d minutes.",
197 REPORT_PERIOD / 60);
198 (void) signal(SIGTERM, SIG_DFL);
199 (void) sigprocmask(SIG_UNBLOCK, &mask, NULL);
200 (void) sleep(REPORT_PERIOD);
201 goto again;
202 }
203 offset = -local.tm_gmtoff;
204#ifdef DEBUG
205 fprintf(stderr, "Initial offset: %ld secs\n", offset);
206#endif
207
208 /* correct the kerneltime for this diffs */
209 /* subtract kernel offset, if present, old offset too */
210
211 diff = offset - tz.tz_minuteswest * 60 - kern_offset;
212
213 if (diff != 0) {
214#ifdef DEBUG
215 fprintf(stderr, "Initial diff: %ld secs\n", diff);
216#endif
217 /* Yet one step for final time */
218
219 final_sec = initial_sec + diff;
220
221 /* get the actual local timezone difference */
222 local = *localtime(&final_sec);
223 final_isdst = diff < 0 ? initial_isdst : local.tm_isdst;
224 if (diff > 0 && initial_isdst != final_isdst) {
225 if (looping)
226 goto bad_final;
227 looping = True;
228 initial_isdst = final_isdst;
229 goto recalculate;
230 }
231 local.tm_isdst = final_isdst;
232
233 localsec = mktime(&local);
234 if (localsec == -1) {
235 bad_final:
236 /*
237 * XXX as above. The user has even less control,
238 * but perhaps we never get here.
239 */
240 if (!sleep_mode) {
241 syslog(LOG_WARNING,
242 "Warning: nonexistent final local time, try to run later.");
243 syslog(LOG_WARNING, "Giving up.");
244 return 1;
245 }
246 syslog(LOG_WARNING,
247 "Warning: nonexistent final local time.");
248 syslog(LOG_WARNING, "Will retry after %d minutes.",
249 REPORT_PERIOD / 60);
250 (void) signal(SIGTERM, SIG_DFL);
251 (void) sigprocmask(SIG_UNBLOCK, &mask, NULL);
252 (void) sleep(REPORT_PERIOD);
253 goto again;
254 }
255 offset = -local.tm_gmtoff;
256#ifdef DEBUG
257 fprintf(stderr, "Final offset: %ld secs\n", offset);
258#endif
259
260 /* correct the kerneltime for this diffs */
261 /* subtract kernel offset, if present, old offset too */
262
263 diff = offset - tz.tz_minuteswest * 60 - kern_offset;
264
265 if (diff != 0) {
266#ifdef DEBUG
267 fprintf(stderr, "Final diff: %ld secs\n", diff);
268#endif
269 /*
270 * stv is abused as a flag. The important value
271 * is in `diff'.
272 */
273 stv = &tv;
274 }
275 }
276
277 if (tz.tz_dsttime != 0 || tz.tz_minuteswest != 0) {
278 tz.tz_dsttime = tz.tz_minuteswest = 0; /* zone info is garbage */
279 stz = &tz;
280 }
281 if (!wall_clock && stz == NULL)
282 stv = NULL;
283
284 /* if init or UTC clock and offset/date will be changed, */
285 /* disable RTC modification for a while. */
286
287 if ( (init && stv != NULL)
288 || ((init || !wall_clock) && kern_offset != offset)
289 ) {
290 mib[0] = CTL_MACHDEP;
291 mib[1] = CPU_DISRTCSET;
292 len = sizeof(disrtcset);
293 if (sysctl(mib, 2, &disrtcset, &len, NULL, 0) == -1) {
294 syslog(LOG_ERR, "sysctl(get_disrtcset): %m");
295 return 1;
296 }
297 if (disrtcset == 0) {
298 disrtcset = 1;
299 need_restore = True;
300 if (sysctl(mib, 2, NULL, NULL, &disrtcset, len) == -1) {
301 syslog(LOG_ERR, "sysctl(set_disrtcset): %m");
302 return 1;
303 }
304 }
305 }
306
307 if ( (init && (stv != NULL || stz != NULL))
308 || (stz != NULL && stv == NULL)
309 ) {
310 if (stv != NULL) {
311 /*
312 * Get the time again, as close as possible to
313 * adjusting it, to minimise drift.
314 * XXX we'd better not fail between here and
315 * restoring disrtcset, since we don't clean up
316 * anything.
317 */
318 if (gettimeofday(&tv, (struct timezone *)NULL)) {
319 syslog(LOG_ERR, "gettimeofday: %m");
320 return 1;
321 }
322 tv.tv_sec += diff;
323 stv = &tv;
324 }
325 if (settimeofday(stv, stz)) {
326 syslog(LOG_ERR, "settimeofday: %m");
327 return 1;
328 }
329 }
330
331 /* setting CPU_ADJKERNTZ have a side effect: resettodr(), which */
332 /* can be disabled by CPU_DISRTCSET, so if init or UTC clock */
333 /* -- don't write RTC, else write RTC. */
334
335 if (kern_offset != offset) {
336 kern_offset = offset;
337 mib[0] = CTL_MACHDEP;
338 mib[1] = CPU_ADJKERNTZ;
339 len = sizeof(kern_offset);
340 if (sysctl(mib, 2, NULL, NULL, &kern_offset, len) == -1) {
341 syslog(LOG_ERR, "sysctl(update_offset): %m");
342 return 1;
343 }
344 }
345
346 mib[0] = CTL_MACHDEP;
347 mib[1] = CPU_WALLCLOCK;
348 len = sizeof(wall_clock);
349 if (sysctl(mib, 2, NULL, NULL, &wall_clock, len) == -1) {
350 syslog(LOG_ERR, "sysctl(put_wallclock): %m");
351 return 1;
352 }
353
354 if (need_restore) {
355 need_restore = False;
356 mib[0] = CTL_MACHDEP;
357 mib[1] = CPU_DISRTCSET;
358 disrtcset = 0;
359 len = sizeof(disrtcset);
360 if (sysctl(mib, 2, NULL, NULL, &disrtcset, len) == -1) {
361 syslog(LOG_ERR, "sysctl(restore_disrtcset): %m");
362 return 1;
363 }
364 }
365
366/****** End of critical section ******/
367
368 if (init && wall_clock) {
369 sleep_mode = False;
370 /* wait for signals and acts like -a */
371 (void) sigsuspend(&emask);
372 goto again;
373 }
374
375 return 0;
376}
377
378static void
379usage()
380{
381 fprintf(stderr, "%s\n%s\n%s\n%s\n",
382 "usage: adjkerntz -i",
383 "\t\t(initial call from /etc/rc)",
384 " adjkerntz -a [-s]",
385 "\t\t(adjustment call, -s for sleep/retry mode)");
386 exit(2);
387}
|