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aa9cc268 WJ |
1 | #if !defined(lint) && !defined(LINT) |
2 | static char rcsid[] = "$Header: /home/local/site/cron2.1/orig/RCS/crond.c,v 2.2 1992/05/13 05:56:35 rich Exp $"; | |
3 | #endif | |
4 | ||
5 | /* Copyright 1988,1990 by Paul Vixie | |
6 | * All rights reserved | |
7 | * | |
8 | * Distribute freely, except: don't remove my name from the source or | |
9 | * documentation (don't take credit for my work), mark your changes (don't | |
10 | * get me blamed for your possible bugs), don't alter or remove this | |
11 | * notice. May be sold if buildable source is provided to buyer. No | |
12 | * warrantee of any kind, express or implied, is included with this | |
13 | * software; use at your own risk, responsibility for damages (if any) to | |
14 | * anyone resulting from the use of this software rests entirely with the | |
15 | * user. | |
16 | * | |
17 | * Send bug reports, bug fixes, enhancements, requests, flames, etc., and | |
18 | * I'll try to keep a version up to date. I can be reached as follows: | |
19 | * Paul Vixie, 329 Noe Street, San Francisco, CA, 94114, (415) 864-7013, | |
20 | * paul@vixie.sf.ca.us || {hoptoad,pacbell,decwrl,crash}!vixie!paul | |
21 | */ | |
22 | ||
23 | ||
24 | #define MAIN_PROGRAM | |
25 | ||
26 | ||
27 | #include "cron.h" | |
28 | #include <sys/time.h> | |
29 | #include <sys/signal.h> | |
30 | #include <sys/types.h> | |
31 | #if defined(BSD) | |
32 | # include <sys/wait.h> | |
33 | # include <sys/resource.h> | |
34 | #endif /*BSD*/ | |
35 | ||
36 | extern int fork(), unlink(); | |
37 | extern time_t time(); | |
38 | extern void exit(); | |
39 | extern unsigned sleep(); | |
40 | ||
41 | void | |
42 | usage() | |
43 | { | |
44 | (void) fprintf(stderr, "usage: %s [-x debugflag[,...]]\n", ProgramName); | |
45 | (void) exit(ERROR_EXIT); | |
46 | } | |
47 | ||
48 | ||
49 | int | |
50 | main(argc, argv) | |
51 | int argc; | |
52 | char *argv[]; | |
53 | { | |
54 | extern void set_cron_uid(), be_different(), load_database(), | |
55 | set_cron_cwd(), open_logfile(); | |
56 | ||
57 | static void cron_tick(), cron_sleep(), cron_sync(), | |
58 | sigchld_handler(), parse_args(), run_reboot_jobs(); | |
59 | ||
60 | auto cron_db database; | |
61 | ||
62 | ProgramName = argv[0]; | |
63 | ||
64 | #if defined(BSD) | |
65 | setlinebuf(stdout); | |
66 | setlinebuf(stderr); | |
67 | #endif | |
68 | ||
69 | parse_args(argc, argv); | |
70 | ||
71 | # if DEBUGGING | |
72 | /* if there are no debug flags turned on, fork as a daemon should. | |
73 | */ | |
74 | if (DebugFlags) | |
75 | { | |
76 | (void) fprintf(stderr, "[%d] crond started\n", getpid()); | |
77 | } | |
78 | else | |
79 | # endif /*DEBUGGING*/ | |
80 | { | |
81 | switch (fork()) | |
82 | { | |
83 | case -1: | |
84 | log_it("CROND",getpid(),"DEATH","can't fork"); | |
85 | exit(0); | |
86 | break; | |
87 | case 0: | |
88 | /* child process */ | |
89 | be_different(); | |
90 | break; | |
91 | default: | |
92 | /* parent process should just die */ | |
93 | _exit(0); | |
94 | } | |
95 | } | |
96 | ||
97 | #if defined(BSD) | |
98 | (void) signal(SIGCHLD, sigchld_handler); | |
99 | #endif /*BSD*/ | |
100 | ||
101 | #if defined(ATT) | |
102 | (void) signal(SIGCLD, SIG_IGN); | |
103 | #endif /*ATT*/ | |
104 | ||
105 | acquire_daemonlock(); | |
106 | set_cron_uid(); | |
107 | set_cron_cwd(); | |
108 | database.head = NULL; | |
109 | database.tail = NULL; | |
110 | database.mtime = (time_t) 0; | |
111 | load_database(&database); | |
112 | run_reboot_jobs(&database); | |
113 | cron_sync(); | |
114 | while (TRUE) | |
115 | { | |
116 | # if DEBUGGING | |
117 | if (!(DebugFlags & DTEST)) | |
118 | # endif /*DEBUGGING*/ | |
119 | cron_sleep(); | |
120 | ||
121 | load_database(&database); | |
122 | ||
123 | /* do this iteration | |
124 | */ | |
125 | cron_tick(&database); | |
126 | ||
127 | /* sleep 1 minute | |
128 | */ | |
129 | TargetTime += 60; | |
130 | } | |
131 | } | |
132 | ||
133 | ||
134 | static void | |
135 | run_reboot_jobs(db) | |
136 | cron_db *db; | |
137 | { | |
138 | extern void job_add(); | |
139 | extern int job_runqueue(); | |
140 | register user *u; | |
141 | register entry *e; | |
142 | ||
143 | for (u = db->head; u != NULL; u = u->next) { | |
144 | for (e = u->crontab; e != NULL; e = e->next) { | |
145 | if (e->flags & WHEN_REBOOT) { | |
146 | job_add(e->cmd, u); | |
147 | } | |
148 | } | |
149 | } | |
150 | (void) job_runqueue(); | |
151 | } | |
152 | ||
153 | ||
154 | static void | |
155 | cron_tick(db) | |
156 | cron_db *db; | |
157 | { | |
158 | extern void job_add(); | |
159 | extern char *env_get(); | |
160 | extern struct tm *localtime(); | |
161 | register struct tm *tm = localtime(&TargetTime); | |
162 | local int minute, hour, dom, month, dow; | |
163 | register user *u; | |
164 | register entry *e; | |
165 | ||
166 | /* make 0-based values out of these so we can use them as indicies | |
167 | */ | |
168 | minute = tm->tm_min -FIRST_MINUTE; | |
169 | hour = tm->tm_hour -FIRST_HOUR; | |
170 | dom = tm->tm_mday -FIRST_DOM; | |
171 | month = tm->tm_mon +1 /* 0..11 -> 1..12 */ -FIRST_MONTH; | |
172 | dow = tm->tm_wday -FIRST_DOW; | |
173 | ||
174 | Debug(DSCH, ("[%d] tick(%d,%d,%d,%d,%d)\n", | |
175 | getpid(), minute, hour, dom, month, dow)) | |
176 | ||
177 | /* the dom/dow situation is odd. '* * 1,15 * Sun' will run on the | |
178 | * first and fifteenth AND every Sunday; '* * * * Sun' will run *only* | |
179 | * on Sundays; '* * 1,15 * *' will run *only* the 1st and 15th. this | |
180 | * is why we keep 'e->dow_star' and 'e->dom_star'. yes, it's bizarre. | |
181 | * like many bizarre things, it's the standard. | |
182 | */ | |
183 | for (u = db->head; u != NULL; u = u->next) { | |
184 | Debug(DSCH|DEXT, ("user [%s:%d:%d:...]\n", | |
185 | env_get(USERENV,u->envp), u->uid, u->gid)) | |
186 | for (e = u->crontab; e != NULL; e = e->next) { | |
187 | Debug(DSCH|DEXT, ("entry [%s]\n", e->cmd)) | |
188 | if (bit_test(e->minute, minute) | |
189 | && bit_test(e->hour, hour) | |
190 | && bit_test(e->month, month) | |
191 | && ( ((e->flags & DOM_STAR) || (e->flags & DOW_STAR)) | |
192 | ? (bit_test(e->dow,dow) && bit_test(e->dom,dom)) | |
193 | : (bit_test(e->dow,dow) || bit_test(e->dom,dom)) | |
194 | ) | |
195 | ) { | |
196 | job_add(e->cmd, u); | |
197 | } | |
198 | } | |
199 | } | |
200 | } | |
201 | ||
202 | ||
203 | /* the task here is to figure out how long it's going to be until :00 of the | |
204 | * following minute and initialize TargetTime to this value. TargetTime | |
205 | * will subsequently slide 60 seconds at a time, with correction applied | |
206 | * implicitly in cron_sleep(). it would be nice to let crond execute in | |
207 | * the "current minute" before going to sleep, but by restarting cron you | |
208 | * could then get it to execute a given minute's jobs more than once. | |
209 | * instead we have the chance of missing a minute's jobs completely, but | |
210 | * that's something sysadmin's know to expect what with crashing computers.. | |
211 | */ | |
212 | static void | |
213 | cron_sync() | |
214 | { | |
215 | extern struct tm *localtime(); | |
216 | register struct tm *tm; | |
217 | ||
218 | TargetTime = time((time_t*)0); | |
219 | tm = localtime(&TargetTime); | |
220 | TargetTime += (60 - tm->tm_sec); | |
221 | } | |
222 | ||
223 | ||
224 | static void | |
225 | cron_sleep() | |
226 | { | |
227 | extern void do_command(); | |
228 | extern int job_runqueue(); | |
229 | register int seconds_to_wait; | |
230 | ||
231 | do { | |
232 | seconds_to_wait = (int) (TargetTime - time((time_t*)0)); | |
233 | Debug(DSCH, ("[%d] TargetTime=%ld, sec-to-wait=%d\n", | |
234 | getpid(), TargetTime, seconds_to_wait)) | |
235 | ||
236 | /* if we intend to sleep, this means that it's finally | |
237 | * time to empty the job queue (execute it). | |
238 | * | |
239 | * if we run any jobs, we'll probably screw up our timing, | |
240 | * so go recompute. | |
241 | * | |
242 | * note that we depend here on the left-to-right nature | |
243 | * of &&, and the short-circuiting. | |
244 | */ | |
245 | } while (seconds_to_wait > 0 && job_runqueue()); | |
246 | ||
247 | if (seconds_to_wait > 0) | |
248 | { | |
249 | Debug(DSCH, ("[%d] sleeping for %d seconds\n", | |
250 | getpid(), seconds_to_wait)) | |
251 | (void) sleep((unsigned int) seconds_to_wait); | |
252 | } | |
253 | } | |
254 | ||
255 | ||
256 | #if defined(BSD) | |
257 | static void | |
258 | sigchld_handler() | |
259 | { | |
260 | union wait waiter; | |
261 | int pid; | |
262 | ||
263 | for (;;) | |
264 | { | |
265 | pid = wait3(&waiter, WNOHANG, (struct rusage *)0); | |
266 | switch (pid) | |
267 | { | |
268 | case -1: | |
269 | Debug(DPROC, | |
270 | ("[%d] sigchld...no children\n", getpid())) | |
271 | return; | |
272 | case 0: | |
273 | Debug(DPROC, | |
274 | ("[%d] sigchld...no dead kids\n", getpid())) | |
275 | return; | |
276 | default: | |
277 | Debug(DPROC, | |
278 | ("[%d] sigchld...pid #%d died, stat=%d\n", | |
279 | getpid(), pid, waiter.w_status)) | |
280 | } | |
281 | } | |
282 | } | |
283 | #endif /*BSD*/ | |
284 | ||
285 | ||
286 | static void | |
287 | parse_args(argc, argv) | |
288 | int argc; | |
289 | char *argv[]; | |
290 | { | |
291 | extern int optind, getopt(); | |
292 | extern void usage(); | |
293 | extern char *optarg; | |
294 | ||
295 | int argch; | |
296 | ||
297 | while (EOF != (argch = getopt(argc, argv, "x:"))) | |
298 | { | |
299 | switch (argch) | |
300 | { | |
301 | default: | |
302 | usage(); | |
303 | case 'x': | |
304 | if (!set_debug_flags(optarg)) | |
305 | usage(); | |
306 | break; | |
307 | } | |
308 | } | |
309 | } |