1 /* Copyright 1988,1990,1993,1994 by Paul Vixie
4 * Distribute freely, except: don't remove my name from the source or
5 * documentation (don't take credit for my work), mark your changes (don't
6 * get me blamed for your possible bugs), don't alter or remove this
7 * notice. May be sold if buildable source is provided to buyer. No
8 * warrantee of any kind, express or implied, is included with this
9 * software; use at your own risk, responsibility for damages (if any) to
10 * anyone resulting from the use of this software rests entirely with the
13 * Send bug reports, bug fixes, enhancements, requests, flames, etc., and
14 * I'll try to keep a version up to date. I can be reached as follows:
15 * Paul Vixie <paul@vix.com> uunet!decwrl!vixie!paul
18 #if !defined(lint) && !defined(LINT)
19 static const char rcsid[] =
20 "$FreeBSD: src/usr.sbin/cron/cron/cron.c,v 1.9.2.2 2001/05/28 23:37:26 babkin Exp $";
27 #include <sys/signal.h>
29 # include <sys/time.h>
35 static void usage __P((void)),
36 run_reboot_jobs __P((cron_db *)),
37 cron_tick __P((cron_db *)),
38 cron_sync __P((void)),
39 cron_sleep __P((cron_db *)),
40 cron_clean __P((cron_db *)),
42 sigchld_handler __P((int)),
44 sighup_handler __P((int)),
45 parse_args __P((int c, char *v[]));
47 static time_t last_time = 0;
48 static int dst_enabled = 0;
54 fprintf(stderr, "usage: cron [-s] [-o] [-x debugflag[,...]]\n");
55 fprintf(stderr, "\ndebugflags: ");
57 for(dflags = DebugFlagNames; *dflags; dflags++) {
58 fprintf(stderr, "%s ", *dflags);
60 fprintf(stderr, "\n");
73 ProgramName = argv[0];
80 parse_args(argc, argv);
83 (void) signal(SIGCHLD, sigchld_handler);
85 (void) signal(SIGCLD, SIG_IGN);
87 (void) signal(SIGHUP, sighup_handler);
89 acquire_daemonlock(0);
94 setenv("PATH", _PATH_DEFPATH, 1);
97 /* if there are no debug flags turned on, fork as a daemon should.
104 (void) fprintf(stderr, "[%d] cron started\n", getpid());
106 if (daemon(1, 0) == -1) {
107 log_it("CRON",getpid(),"DEATH","can't become daemon");
112 acquire_daemonlock(0);
113 database.head = NULL;
114 database.tail = NULL;
115 database.mtime = (time_t) 0;
116 load_database(&database);
117 run_reboot_jobs(&database);
121 /* if (!(DebugFlags & DTEST)) */
122 # endif /*DEBUGGING*/
123 cron_sleep(&database);
125 load_database(&database);
129 cron_tick(&database);
145 for (u = db->head; u != NULL; u = u->next) {
146 for (e = u->crontab; e != NULL; e = e->next) {
147 if (e->flags & WHEN_REBOOT) {
152 (void) job_runqueue();
160 static struct tm lasttm;
161 static time_t diff = 0, /* time difference in seconds from the last offset change */
162 difflimit = 0; /* end point for the time zone correction */
163 struct tm otztm; /* time in the old time zone */
164 int otzminute, otzhour, otzdom, otzmonth, otzdow;
165 register struct tm *tm = localtime(&TargetTime);
166 register int minute, hour, dom, month, dow;
170 /* make 0-based values out of these so we can use them as indicies
172 minute = tm->tm_min -FIRST_MINUTE;
173 hour = tm->tm_hour -FIRST_HOUR;
174 dom = tm->tm_mday -FIRST_DOM;
175 month = tm->tm_mon +1 /* 0..11 -> 1..12 */ -FIRST_MONTH;
176 dow = tm->tm_wday -FIRST_DOW;
178 Debug(DSCH, ("[%d] tick(%d,%d,%d,%d,%d)\n",
179 getpid(), minute, hour, dom, month, dow))
181 if (dst_enabled && last_time != 0
182 && TargetTime > last_time /* exclude stepping back */
183 && tm->tm_gmtoff != lasttm.tm_gmtoff ) {
185 diff = tm->tm_gmtoff - lasttm.tm_gmtoff;
187 if ( diff > 0 ) { /* ST->DST */
188 /* mark jobs for an earlier run */
189 difflimit = TargetTime + diff;
190 for (u = db->head; u != NULL; u = u->next) {
191 for (e = u->crontab; e != NULL; e = e->next) {
192 e->flags &= ~NOT_UNTIL;
193 if ( e->lastrun >= TargetTime )
195 /* not include the ends of hourly ranges */
196 if ( e->lastrun < TargetTime - 3600 )
202 } else { /* diff < 0 : DST->ST */
203 /* mark jobs for skipping */
204 difflimit = TargetTime - diff;
205 for (u = db->head; u != NULL; u = u->next) {
206 for (e = u->crontab; e != NULL; e = e->next) {
207 e->flags |= NOT_UNTIL;
215 /* if the time was reset of the end of special zone is reached */
216 if (last_time == 0 || TargetTime >= difflimit) {
217 /* disable the TZ switch checks */
220 for (u = db->head; u != NULL; u = u->next) {
221 for (e = u->crontab; e != NULL; e = e->next) {
222 e->flags &= ~(RUN_AT|NOT_UNTIL);
226 /* get the time in the old time zone */
227 time_t difftime = TargetTime + tm->tm_gmtoff - diff;
228 gmtime_r(&difftime, &otztm);
230 /* make 0-based values out of these so we can use them as indicies
232 otzminute = otztm.tm_min -FIRST_MINUTE;
233 otzhour = otztm.tm_hour -FIRST_HOUR;
234 otzdom = otztm.tm_mday -FIRST_DOM;
235 otzmonth = otztm.tm_mon +1 /* 0..11 -> 1..12 */ -FIRST_MONTH;
236 otzdow = otztm.tm_wday -FIRST_DOW;
240 /* the dom/dow situation is odd. '* * 1,15 * Sun' will run on the
241 * first and fifteenth AND every Sunday; '* * * * Sun' will run *only*
242 * on Sundays; '* * 1,15 * *' will run *only* the 1st and 15th. this
243 * is why we keep 'e->dow_star' and 'e->dom_star'. yes, it's bizarre.
244 * like many bizarre things, it's the standard.
246 for (u = db->head; u != NULL; u = u->next) {
247 for (e = u->crontab; e != NULL; e = e->next) {
248 Debug(DSCH|DEXT, ("user [%s:%d:%d:...] cmd=\"%s\"\n",
249 env_get("LOGNAME", e->envp),
250 e->uid, e->gid, e->cmd))
252 if ( diff != 0 && (e->flags & (RUN_AT|NOT_UNTIL)) ) {
253 if (bit_test(e->minute, otzminute)
254 && bit_test(e->hour, otzhour)
255 && bit_test(e->month, otzmonth)
256 && ( ((e->flags & DOM_STAR) || (e->flags & DOW_STAR))
257 ? (bit_test(e->dow,otzdow) && bit_test(e->dom,otzdom))
258 : (bit_test(e->dow,otzdow) || bit_test(e->dom,otzdom))
261 if ( e->flags & RUN_AT ) {
263 e->lastrun = TargetTime;
267 e->flags &= ~NOT_UNTIL;
268 } else if ( e->flags & NOT_UNTIL )
272 if (bit_test(e->minute, minute)
273 && bit_test(e->hour, hour)
274 && bit_test(e->month, month)
275 && ( ((e->flags & DOM_STAR) || (e->flags & DOW_STAR))
276 ? (bit_test(e->dow,dow) && bit_test(e->dom,dom))
277 : (bit_test(e->dow,dow) || bit_test(e->dom,dom))
281 e->lastrun = TargetTime;
287 last_time = TargetTime;
292 /* the task here is to figure out how long it's going to be until :00 of the
293 * following minute and initialize TargetTime to this value. TargetTime
294 * will subsequently slide 60 seconds at a time, with correction applied
295 * implicitly in cron_sleep(). it would be nice to let cron execute in
296 * the "current minute" before going to sleep, but by restarting cron you
297 * could then get it to execute a given minute's jobs more than once.
298 * instead we have the chance of missing a minute's jobs completely, but
299 * that's something sysadmin's know to expect what with crashing computers..
303 register struct tm *tm;
305 TargetTime = time((time_t*)0);
306 tm = localtime(&TargetTime);
307 TargetTime += (60 - tm->tm_sec);
315 int seconds_to_wait = 0;
318 * Loop until we reach the top of the next minute, sleep when possible.
322 seconds_to_wait = (int) (TargetTime - time((time_t*)0));
325 * If the seconds_to_wait value is insane, jump the cron
328 if (seconds_to_wait < -600 || seconds_to_wait > 600) {
334 Debug(DSCH, ("[%d] TargetTime=%ld, sec-to-wait=%d\n",
335 getpid(), (long)TargetTime, seconds_to_wait))
338 * If we've run out of wait time or there are no jobs left
342 if (seconds_to_wait <= 0)
344 if (job_runqueue() == 0) {
345 Debug(DSCH, ("[%d] sleeping for %d seconds\n",
346 getpid(), seconds_to_wait))
348 sleep(seconds_to_wait);
354 /* if the time was changed abruptly, clear the flags related
355 * to the daylight time switch handling to avoid strange effects
367 for (u = db->head; u != NULL; u = u->next) {
368 for (e = u->crontab; e != NULL; e = e->next) {
369 e->flags &= ~(RUN_AT|NOT_UNTIL);
382 pid = waitpid(-1, &waiter, WNOHANG);
384 pid = wait3(&waiter, WNOHANG, (struct rusage *)0);
389 ("[%d] sigchld...no children\n", getpid()))
393 ("[%d] sigchld...no dead kids\n", getpid()))
397 ("[%d] sigchld...pid #%d died, stat=%d\n",
398 getpid(), pid, WEXITSTATUS(waiter)))
402 #endif /*USE_SIGCHLD*/
412 parse_args(argc, argv)
418 while ((argch = getopt(argc, argv, "osx:")) != -1) {
427 if (!set_debug_flags(optarg))