1/*
2 * Copyright (C) 1993 by Andrew 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
28char copyright[] =
29"@(#)Copyright (C) 1993 by Andrew A. Chernov, Moscow, Russia.\n\
30 All rights reserved.\n";
31#endif /* not lint */
32
33/*
34 * Andrew A. Chernov <ache@astral.msk.su> Dec 20 1993
35 *
36 * Fix kernel time value if machine run wall CMOS clock
37 * (and /etc/wall_cmos_clock file present)
38 * using zoneinfo rules or direct TZ environment variable set.
39 * Use Joerg Wunsch idea for seconds accurate offset calculation
40 * with Garrett Wollman and Bruce Evans fixes.
41 *
42 */
43#include <stdio.h>
| 1/*
2 * Copyright (C) 1993 by Andrew 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
28char copyright[] =
29"@(#)Copyright (C) 1993 by Andrew A. Chernov, Moscow, Russia.\n\
30 All rights reserved.\n";
31#endif /* not lint */
32
33/*
34 * Andrew A. Chernov <ache@astral.msk.su> Dec 20 1993
35 *
36 * Fix kernel time value if machine run wall CMOS clock
37 * (and /etc/wall_cmos_clock file present)
38 * using zoneinfo rules or direct TZ environment variable set.
39 * Use Joerg Wunsch idea for seconds accurate offset calculation
40 * with Garrett Wollman and Bruce Evans fixes.
41 *
42 */
43#include <stdio.h>
|
| 44#include <signal.h>
|
44#include <stdlib.h>
45#include <unistd.h>
46#include <syslog.h>
47#include <sys/stat.h>
48#include <sys/time.h>
49#include <sys/param.h>
50#include <machine/cpu.h>
51#include <sys/sysctl.h>
52
53#include "pathnames.h"
54
55#define REPORT_PERIOD (30*60)
56
| 45#include <stdlib.h>
46#include <unistd.h>
47#include <syslog.h>
48#include <sys/stat.h>
49#include <sys/time.h>
50#include <sys/param.h>
51#include <machine/cpu.h>
52#include <sys/sysctl.h>
53
54#include "pathnames.h"
55
56#define REPORT_PERIOD (30*60)
57
|
| 58void fake() {}
59
|
57int main(argc, argv)
58 int argc;
59 char **argv;
60{
61 struct tm local, utc;
62 struct timeval tv, *stv;
63 struct timezone tz, *stz;
64 int kern_offset;
65 size_t len;
66 int mib[2];
67 /* Avoid time_t here, can be unsigned long or worse */
68 long offset, utcsec, localsec, diff;
69 time_t initial_sec, final_sec;
70 int ch, init = -1;
71 int disrtcset, need_restore = 0;
| 60int main(argc, argv)
61 int argc;
62 char **argv;
63{
64 struct tm local, utc;
65 struct timeval tv, *stv;
66 struct timezone tz, *stz;
67 int kern_offset;
68 size_t len;
69 int mib[2];
70 /* Avoid time_t here, can be unsigned long or worse */
71 long offset, utcsec, localsec, diff;
72 time_t initial_sec, final_sec;
73 int ch, init = -1;
74 int disrtcset, need_restore = 0;
|
| 75 sigset_t mask, emask;
|
72
73 while ((ch = getopt(argc, argv, "ai")) != EOF)
74 switch((char)ch) {
75 case 'i': /* initial call, save offset */
76 if (init != -1)
77 goto usage;
78 init = 1;
79 break;
80 case 'a': /* adjustment call, use saved offset */
81 if (init != -1)
82 goto usage;
83 init = 0;
84 break;
85 default:
86 usage:
87 fprintf(stderr, "Usage:\n\
88\tadjkerntz -i\t(initial call from /etc/rc)\n\
89\tadjkerntz -a\t(adjustment call from crontab)\n");
90 return 2;
91 }
92 if (init == -1)
93 goto usage;
94
95 if (access(_PATH_CLOCK, F_OK))
96 return 0;
97
| 76
77 while ((ch = getopt(argc, argv, "ai")) != EOF)
78 switch((char)ch) {
79 case 'i': /* initial call, save offset */
80 if (init != -1)
81 goto usage;
82 init = 1;
83 break;
84 case 'a': /* adjustment call, use saved offset */
85 if (init != -1)
86 goto usage;
87 init = 0;
88 break;
89 default:
90 usage:
91 fprintf(stderr, "Usage:\n\
92\tadjkerntz -i\t(initial call from /etc/rc)\n\
93\tadjkerntz -a\t(adjustment call from crontab)\n");
94 return 2;
95 }
96 if (init == -1)
97 goto usage;
98
99 if (access(_PATH_CLOCK, F_OK))
100 return 0;
101
|
| 102 sigemptyset(&mask);
103 sigemptyset(&emask);
104 sigaddset(&mask, SIGTERM);
105
|
98 openlog("adjkerntz", LOG_PID|LOG_PERROR, LOG_DAEMON);
99
| 106 openlog("adjkerntz", LOG_PID|LOG_PERROR, LOG_DAEMON);
107
|
| 108 (void) signal(SIGHUP, SIG_IGN);
109
110 if (init && daemon(0, 1)) {
111 syslog(LOG_ERR, "daemon: %m");
112 return 1;
113 }
114
|
100again:
101
| 115again:
116
|
| 117 (void) sigprocmask(SIG_BLOCK, &mask, NULL);
118 (void) signal(SIGTERM, fake);
119
|
102/****** Critical section, do all things as fast as possible ******/
103
104 /* get local CMOS clock and possible kernel offset */
105 if (gettimeofday(&tv, &tz)) {
106 syslog(LOG_ERR, "gettimeofday: %m");
107 return 1;
108 }
109
110 /* get the actual local timezone difference */
111 initial_sec = tv.tv_sec;
112 local = *localtime(&initial_sec);
113 utc = *gmtime(&initial_sec);
114 utc.tm_isdst = local.tm_isdst; /* Use current timezone for mktime(), */
115 /* because it assumed local time */
116
117 /* calculate local CMOS diff from GMT */
118
119 utcsec = mktime(&utc);
120 localsec = mktime(&local);
121 if (utcsec == -1 || localsec == -1) {
122 /*
123 * XXX user can only control local time, and it is
124 * unacceptable to fail here for init. 2:30 am in the
125 * middle of the nonexistent hour means 3:30 am.
126 */
127 syslog(LOG_WARNING,
128 "Nonexistent local time -- will retry after %d secs", REPORT_PERIOD);
| 120/****** Critical section, do all things as fast as possible ******/
121
122 /* get local CMOS clock and possible kernel offset */
123 if (gettimeofday(&tv, &tz)) {
124 syslog(LOG_ERR, "gettimeofday: %m");
125 return 1;
126 }
127
128 /* get the actual local timezone difference */
129 initial_sec = tv.tv_sec;
130 local = *localtime(&initial_sec);
131 utc = *gmtime(&initial_sec);
132 utc.tm_isdst = local.tm_isdst; /* Use current timezone for mktime(), */
133 /* because it assumed local time */
134
135 /* calculate local CMOS diff from GMT */
136
137 utcsec = mktime(&utc);
138 localsec = mktime(&local);
139 if (utcsec == -1 || localsec == -1) {
140 /*
141 * XXX user can only control local time, and it is
142 * unacceptable to fail here for init. 2:30 am in the
143 * middle of the nonexistent hour means 3:30 am.
144 */
145 syslog(LOG_WARNING,
146 "Nonexistent local time -- will retry after %d secs", REPORT_PERIOD);
|
| 147 (void) signal(SIGTERM, SIG_DFL);
148 (void) sigprocmask(SIG_UNBLOCK, &mask, NULL);
|
129 (void) sleep(REPORT_PERIOD);
130 goto again;
131 }
132 offset = utcsec - localsec;
133
134 mib[0] = CTL_MACHDEP;
135 mib[1] = CPU_ADJKERNTZ;
136 len = sizeof(kern_offset);
137 if (sysctl(mib, 2, &kern_offset, &len, NULL, 0) == -1) {
138 syslog(LOG_ERR, "sysctl(get_offset): %m");
139 return 1;
140 }
141
142 /* correct the kerneltime for this diffs */
143 /* subtract kernel offset, if present, old offset too */
144
145 diff = offset - tz.tz_minuteswest * 60 - kern_offset;
146
147 if (diff != 0) {
148
149 /* Yet one step for final time */
150
151 final_sec = tv.tv_sec + diff;
152
153 /* get the actual local timezone difference */
154 local = *localtime(&final_sec);
155 utc = *gmtime(&final_sec);
156 utc.tm_isdst = local.tm_isdst; /* Use current timezone for mktime(), */
157 /* because it assumed local time */
158
159 utcsec = mktime(&utc);
160 localsec = mktime(&local);
161 if (utcsec == -1 || localsec == -1) {
162 /*
163 * XXX as above. The user has even less control,
164 * but perhaps we never get here.
165 */
166 syslog(LOG_WARNING,
167 "Nonexistent (final) local time -- will retry after %d secs", REPORT_PERIOD);
| 149 (void) sleep(REPORT_PERIOD);
150 goto again;
151 }
152 offset = utcsec - localsec;
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 /* correct the kerneltime for this diffs */
163 /* subtract kernel offset, if present, old offset too */
164
165 diff = offset - tz.tz_minuteswest * 60 - kern_offset;
166
167 if (diff != 0) {
168
169 /* Yet one step for final time */
170
171 final_sec = tv.tv_sec + diff;
172
173 /* get the actual local timezone difference */
174 local = *localtime(&final_sec);
175 utc = *gmtime(&final_sec);
176 utc.tm_isdst = local.tm_isdst; /* Use current timezone for mktime(), */
177 /* because it assumed local time */
178
179 utcsec = mktime(&utc);
180 localsec = mktime(&local);
181 if (utcsec == -1 || localsec == -1) {
182 /*
183 * XXX as above. The user has even less control,
184 * but perhaps we never get here.
185 */
186 syslog(LOG_WARNING,
187 "Nonexistent (final) local time -- will retry after %d secs", REPORT_PERIOD);
|
| 188 (void) signal(SIGTERM, SIG_DFL);
189 (void) sigprocmask(SIG_UNBLOCK, &mask, NULL);
|
168 (void) sleep(REPORT_PERIOD);
169 goto again;
170 }
171 offset = utcsec - localsec;
172
173 /* correct the kerneltime for this diffs */
174 /* subtract kernel offset, if present, old offset too */
175
176 diff = offset - tz.tz_minuteswest * 60 - kern_offset;
177
178 if (diff != 0) {
179 tv.tv_sec += diff;
180 tv.tv_usec = 0; /* we are restarting here... */
181 stv = &tv;
182 }
183 else
184 stv = NULL;
185 }
186 else
187 stv = NULL;
188
189 if (tz.tz_dsttime != 0 || tz.tz_minuteswest != 0) {
190 tz.tz_dsttime = tz.tz_minuteswest = 0; /* zone info is garbage */
191 stz = &tz;
192 }
193 else
194 stz = NULL;
195
196 if (stz != NULL || stv != NULL) {
197 if (init && stv != NULL) {
198 mib[0] = CTL_MACHDEP;
199 mib[1] = CPU_DISRTCSET;
200 len = sizeof(disrtcset);
201 if (sysctl(mib, 2, &disrtcset, &len, NULL, 0) == -1) {
202 syslog(LOG_ERR, "sysctl(get_disrtcset): %m");
203 return 1;
204 }
205 if (disrtcset == 0) {
206 disrtcset = 1;
207 need_restore = 1;
208 if (sysctl(mib, 2, NULL, NULL, &disrtcset, len) == -1) {
209 syslog(LOG_ERR, "sysctl(set_disrtcset): %m");
210 return 1;
211 }
212 }
213 }
214 /* stz means that kernel zone shifted */
215 /* clock needs adjustment even if !init */
216 if ((init || stz != NULL) && settimeofday(stv, stz)) {
217 syslog(LOG_ERR, "settimeofday: %m");
218 return 1;
219 }
220 }
221
222 if (kern_offset != offset) {
223 kern_offset = offset;
224 mib[0] = CTL_MACHDEP;
225 mib[1] = CPU_ADJKERNTZ;
226 len = sizeof(kern_offset);
227 if (sysctl(mib, 2, NULL, NULL, &kern_offset, len) == -1) {
228 syslog(LOG_ERR, "sysctl(update_offset): %m");
229 return 1;
230 }
231 }
232
233 if (need_restore) {
234 need_restore = 0;
235 disrtcset = 0;
236 if (sysctl(mib, 2, NULL, NULL, &disrtcset, len) == -1) {
237 syslog(LOG_ERR, "sysctl(restore_disrtcset): %m");
238 return 1;
239 }
240 }
241
242/****** End of critical section ******/
243
| 190 (void) sleep(REPORT_PERIOD);
191 goto again;
192 }
193 offset = utcsec - localsec;
194
195 /* correct the kerneltime for this diffs */
196 /* subtract kernel offset, if present, old offset too */
197
198 diff = offset - tz.tz_minuteswest * 60 - kern_offset;
199
200 if (diff != 0) {
201 tv.tv_sec += diff;
202 tv.tv_usec = 0; /* we are restarting here... */
203 stv = &tv;
204 }
205 else
206 stv = NULL;
207 }
208 else
209 stv = NULL;
210
211 if (tz.tz_dsttime != 0 || tz.tz_minuteswest != 0) {
212 tz.tz_dsttime = tz.tz_minuteswest = 0; /* zone info is garbage */
213 stz = &tz;
214 }
215 else
216 stz = NULL;
217
218 if (stz != NULL || stv != NULL) {
219 if (init && stv != NULL) {
220 mib[0] = CTL_MACHDEP;
221 mib[1] = CPU_DISRTCSET;
222 len = sizeof(disrtcset);
223 if (sysctl(mib, 2, &disrtcset, &len, NULL, 0) == -1) {
224 syslog(LOG_ERR, "sysctl(get_disrtcset): %m");
225 return 1;
226 }
227 if (disrtcset == 0) {
228 disrtcset = 1;
229 need_restore = 1;
230 if (sysctl(mib, 2, NULL, NULL, &disrtcset, len) == -1) {
231 syslog(LOG_ERR, "sysctl(set_disrtcset): %m");
232 return 1;
233 }
234 }
235 }
236 /* stz means that kernel zone shifted */
237 /* clock needs adjustment even if !init */
238 if ((init || stz != NULL) && settimeofday(stv, stz)) {
239 syslog(LOG_ERR, "settimeofday: %m");
240 return 1;
241 }
242 }
243
244 if (kern_offset != offset) {
245 kern_offset = offset;
246 mib[0] = CTL_MACHDEP;
247 mib[1] = CPU_ADJKERNTZ;
248 len = sizeof(kern_offset);
249 if (sysctl(mib, 2, NULL, NULL, &kern_offset, len) == -1) {
250 syslog(LOG_ERR, "sysctl(update_offset): %m");
251 return 1;
252 }
253 }
254
255 if (need_restore) {
256 need_restore = 0;
257 disrtcset = 0;
258 if (sysctl(mib, 2, NULL, NULL, &disrtcset, len) == -1) {
259 syslog(LOG_ERR, "sysctl(restore_disrtcset): %m");
260 return 1;
261 }
262 }
263
264/****** End of critical section ******/
265
|
| 266 if (init) {
267 init = 0;
268 /* wait for signals and acts like -a */
269 (void) sigsuspend(&emask);
270 goto again;
271 }
272
|
244 return 0;
245}
| 273 return 0;
274}
|