summaryrefslogtreecommitdiff
path: root/miscutils/crond.c
blob: 9721a8a9ae29aca53e792aee843382c13fb0231b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
/* vi: set sw=4 ts=4: */
/*
 * crond -d[#] -c <crondir> -f -b
 *
 * run as root, but NOT setuid root
 *
 * Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
 * (version 2.3.2)
 * Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
 */

#include "libbb.h"
#include <syslog.h>

#ifndef CRONTABS
#define CRONTABS        "/var/spool/cron/crontabs"
#endif
#ifndef TMPDIR
#define TMPDIR          "/var/spool/cron"
#endif
#ifndef SENDMAIL
#define SENDMAIL        "sendmail"
#endif
#ifndef SENDMAIL_ARGS
#define SENDMAIL_ARGS   "-ti", "oem"
#endif
#ifndef CRONUPDATE
#define CRONUPDATE      "cron.update"
#endif
#ifndef MAXLINES
#define MAXLINES        256	/* max lines in non-root crontabs */
#endif

typedef struct CronFile {
	struct CronFile *cf_Next;
	struct CronLine *cf_LineBase;
	char *cf_User;		/* username                     */
	int cf_Ready;		/* bool: one or more jobs ready */
	int cf_Running;		/* bool: one or more jobs running */
	int cf_Deleted;		/* marked for deletion, ignore  */
} CronFile;

typedef struct CronLine {
	struct CronLine *cl_Next;
	char *cl_Shell;		/* shell command                        */
	pid_t cl_Pid;		/* running pid, 0, or armed (-1)        */
	int cl_MailFlag;	/* running pid is for mail              */
	int cl_MailPos;		/* 'empty file' size                    */
	char cl_Mins[60];	/* 0-59                                 */
	char cl_Hrs[24];	/* 0-23                                 */
	char cl_Days[32];	/* 1-31                                 */
	char cl_Mons[12];	/* 0-11                                 */
	char cl_Dow[7];		/* 0-6, beginning sunday                */
} CronLine;

#define RUN_RANOUT      1
#define RUN_RUNNING     2
#define RUN_FAILED      3

#define DaemonUid 0

#if ENABLE_DEBUG_CROND_OPTION
static unsigned DebugOpt;
#endif

static unsigned LogLevel = 8;
static const char *LogFile;
static const char *CDir = CRONTABS;

static void startlogger(void);

static void CheckUpdates(void);
static void SynchronizeDir(void);
static int TestJobs(time_t t1, time_t t2);
static void RunJobs(void);
static int CheckJobs(void);

static void RunJob(const char *user, CronLine * line);

#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
static void EndJob(const char *user, CronLine * line);
#else
#define EndJob(user, line)  line->cl_Pid = 0
#endif

static void DeleteFile(const char *userName);

static CronFile *FileBase;


static void crondlog(const char *ctl, ...)
{
	va_list va;
	const char *fmt;
	int level = (int) (ctl[0] & 0xf);
	int type = level == 20 ?
		LOG_ERR : ((ctl[0] & 0100) ? LOG_WARNING : LOG_NOTICE);

	va_start(va, ctl);
	fmt = ctl + 1;
	if (level >= LogLevel) {

#if ENABLE_DEBUG_CROND_OPTION
		if (DebugOpt) {
			vfprintf(stderr, fmt, va);
		} else
#endif
		if (LogFile == NULL) {
			vsyslog(type, fmt, va);
		} else {
#if !ENABLE_DEBUG_CROND_OPTION
			int logfd = open(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
#else
			int logfd = open3_or_warn(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
#endif
			if (logfd >= 0) {
				vdprintf(logfd, fmt, va);
				close(logfd);
			}
		}
	}
	va_end(va);
	if (ctl[0] & 0200) {
		exit(20);
	}
}

int crond_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int crond_main(int ac, char **av)
{
	unsigned opt;
	char *lopt, *Lopt, *copt;
	USE_DEBUG_CROND_OPTION(char *dopt;)

	opt_complementary = "f-b:b-f:S-L:L-S" USE_DEBUG_CROND_OPTION(":d-l");
	opterr = 0;			/* disable getopt 'errors' message. */
	opt = getopt32(av, "l:L:fbSc:" USE_DEBUG_CROND_OPTION("d:"),
			&lopt, &Lopt, &copt USE_DEBUG_CROND_OPTION(, &dopt));
	if (opt & 1) /* -l */
		LogLevel = xatou(lopt);
	if (opt & 2) /* -L */
		if (*Lopt)
			LogFile = Lopt;
	if (opt & 32) /* -c */
		if (*copt)
			CDir = copt;
#if ENABLE_DEBUG_CROND_OPTION
	if (opt & 64) { /* -d */
		DebugOpt = xatou(dopt);
		LogLevel = 0;
	}
#endif

	/* close stdin and stdout, stderr.
	 * close unused descriptors -  don't need.
	 * optional detach from controlling terminal
	 */
	if (!(opt & 4))
		bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, av);

	xchdir(CDir);
	signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */

	startlogger();	/* need if syslog mode selected */

	/*
	 * main loop - synchronize to 1 second after the minute, minimum sleep
	 *             of 1 second.
	 */
	crondlog("\011%s " BB_VER " started, log level %d\n",
			 applet_name, LogLevel);

	SynchronizeDir();

	{
		time_t t1 = time(NULL);
		time_t t2;
		long dt;
		int rescan = 60;
		short sleep_time = 60;

		write_pidfile("/var/run/crond.pid");
		for (;;) {
			sleep((sleep_time + 1) - (short) (time(NULL) % sleep_time));

			t2 = time(NULL);
			dt = t2 - t1;

			/*
			 * The file 'cron.update' is checked to determine new cron
			 * jobs.  The directory is rescanned once an hour to deal
			 * with any screwups.
			 *
			 * check for disparity.  Disparities over an hour either way
			 * result in resynchronization.  A reverse-indexed disparity
			 * less then an hour causes us to effectively sleep until we
			 * match the original time (i.e. no re-execution of jobs that
			 * have just been run).  A forward-indexed disparity less then
			 * an hour causes intermediate jobs to be run, but only once
			 * in the worst case.
			 *
			 * when running jobs, the inequality used is greater but not
			 * equal to t1, and less then or equal to t2.
			 */

			if (--rescan == 0) {
				rescan = 60;
				SynchronizeDir();
			}
			CheckUpdates();
#if ENABLE_DEBUG_CROND_OPTION
			if (DebugOpt)
				crondlog("\005Wakeup dt=%d\n", dt);
#endif
			if (dt < -60 * 60 || dt > 60 * 60) {
				t1 = t2;
				crondlog("\111time disparity of %d minutes detected\n", dt / 60);
			} else if (dt > 0) {
				TestJobs(t1, t2);
				RunJobs();
				sleep(5);
				if (CheckJobs() > 0) {
					sleep_time = 10;
				} else {
					sleep_time = 60;
				}
				t1 = t2;
			}
		}
	}
	return 0; /* not reached */
}

static int ChangeUser(const char *user)
{
	struct passwd *pas;
	const char *err_msg;

	/*
	 * Obtain password entry and change privileges
	 */
	pas = getpwnam(user);
	if (pas == 0) {
		crondlog("\011failed to get uid for %s", user);
		return -1;
	}
	setenv("USER", pas->pw_name, 1);
	setenv("HOME", pas->pw_dir, 1);
	setenv("SHELL", DEFAULT_SHELL, 1);

	/*
	 * Change running state to the user in question
	 */
	err_msg = change_identity_e2str(pas);
	if (err_msg) {
		crondlog("\011%s for user %s", err_msg, user);
		return -1;
	}
	if (chdir(pas->pw_dir) < 0) {
		crondlog("\011chdir failed: %s: %m", pas->pw_dir);
		if (chdir(TMPDIR) < 0) {
			crondlog("\011chdir failed: %s: %m", TMPDIR);
			return -1;
		}
	}
	return pas->pw_uid;
}

static void startlogger(void)
{
	if (LogFile == NULL) {
		openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
	}
#if ENABLE_DEBUG_CROND_OPTION
	else {				/* test logfile */
		int logfd;

		logfd = open3_or_warn(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
		if (logfd >= 0) {
			close(logfd);
		}
	}
#endif
}


static const char DowAry[] ALIGN1 =
	"sun""mon""tue""wed""thu""fri""sat"
	/* "Sun""Mon""Tue""Wed""Thu""Fri""Sat" */
;

static const char MonAry[] ALIGN1 =
	"jan""feb""mar""apr""may""jun""jul""aug""sep""oct""nov""dec"
	/* "Jan""Feb""Mar""Apr""May""Jun""Jul""Aug""Sep""Oct""Nov""Dec" */
;

static char *ParseField(char *user, char *ary, int modvalue, int off,
				const char *names, char *ptr)
/* 'names' is a pointer to a set of 3-char abbreviations */
{
	char *base = ptr;
	int n1 = -1;
	int n2 = -1;

	if (base == NULL) {
		return NULL;
	}

	while (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
		int skip = 0;

		/* Handle numeric digit or symbol or '*' */

		if (*ptr == '*') {
			n1 = 0;		/* everything will be filled */
			n2 = modvalue - 1;
			skip = 1;
			++ptr;
		} else if (*ptr >= '0' && *ptr <= '9') {
			if (n1 < 0) {
				n1 = strtol(ptr, &ptr, 10) + off;
			} else {
				n2 = strtol(ptr, &ptr, 10) + off;
			}
			skip = 1;
		} else if (names) {
			int i;

			for (i = 0; names[i]; i += 3) {
				/* was using strncmp before... */
				if (strncasecmp(ptr, &names[i], 3) == 0) {
					ptr += 3;
					if (n1 < 0) {
						n1 = i / 3;
					} else {
						n2 = i / 3;
					}
					skip = 1;
					break;
				}
			}
		}

		/* handle optional range '-' */

		if (skip == 0) {
			crondlog("\111failed user %s parsing %s\n", user, base);
			return NULL;
		}
		if (*ptr == '-' && n2 < 0) {
			++ptr;
			continue;
		}

		/*
		 * collapse single-value ranges, handle skipmark, and fill
		 * in the character array appropriately.
		 */

		if (n2 < 0) {
			n2 = n1;
		}
		if (*ptr == '/') {
			skip = strtol(ptr + 1, &ptr, 10);
		}
		/*
		 * fill array, using a failsafe is the easiest way to prevent
		 * an endless loop
		 */

		{
			int s0 = 1;
			int failsafe = 1024;

			--n1;
			do {
				n1 = (n1 + 1) % modvalue;

				if (--s0 == 0) {
					ary[n1 % modvalue] = 1;
					s0 = skip;
				}
			}
			while (n1 != n2 && --failsafe);

			if (failsafe == 0) {
				crondlog("\111failed user %s parsing %s\n", user, base);
				return NULL;
			}
		}
		if (*ptr != ',') {
			break;
		}
		++ptr;
		n1 = -1;
		n2 = -1;
	}

	if (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
		crondlog("\111failed user %s parsing %s\n", user, base);
		return NULL;
	}

	while (*ptr == ' ' || *ptr == '\t' || *ptr == '\n') {
		++ptr;
	}
#if ENABLE_DEBUG_CROND_OPTION
	if (DebugOpt) {
		int i;

		for (i = 0; i < modvalue; ++i) {
			crondlog("\005%d", ary[i]);
		}
		crondlog("\005\n");
	}
#endif

	return ptr;
}

static void FixDayDow(CronLine * line)
{
	int i;
	int weekUsed = 0;
	int daysUsed = 0;

	for (i = 0; i < (int)(ARRAY_SIZE(line->cl_Dow)); ++i) {
		if (line->cl_Dow[i] == 0) {
			weekUsed = 1;
			break;
		}
	}
	for (i = 0; i < (int)(ARRAY_SIZE(line->cl_Days)); ++i) {
		if (line->cl_Days[i] == 0) {
			daysUsed = 1;
			break;
		}
	}
	if (weekUsed && !daysUsed) {
		memset(line->cl_Days, 0, sizeof(line->cl_Days));
	}
	if (daysUsed && !weekUsed) {
		memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
	}
}



static void SynchronizeFile(const char *fileName)
{
	int maxEntries = MAXLINES;
	int maxLines;
	char buf[1024];

	if (strcmp(fileName, "root") == 0) {
		maxEntries = 65535;
	}
	maxLines = maxEntries * 10;

	if (fileName) {
		FILE *fi;

		DeleteFile(fileName);

		fi = fopen(fileName, "r");
		if (fi != NULL) {
			struct stat sbuf;

			if (fstat(fileno(fi), &sbuf) == 0 && sbuf.st_uid == DaemonUid) {
				CronFile *file = xzalloc(sizeof(CronFile));
				CronLine **pline;

				file->cf_User = strdup(fileName);
				pline = &file->cf_LineBase;

				while (fgets(buf, sizeof(buf), fi) != NULL && --maxLines) {
					CronLine line;
					char *ptr;

					trim(buf);
					if (buf[0] == 0 || buf[0] == '#') {
						continue;
					}
					if (--maxEntries == 0) {
						break;
					}
					memset(&line, 0, sizeof(line));

#if ENABLE_DEBUG_CROND_OPTION
					if (DebugOpt) {
						crondlog("\111User %s Entry %s\n", fileName, buf);
					}
#endif

					/* parse date ranges */
					ptr = ParseField(file->cf_User, line.cl_Mins, 60, 0, NULL, buf);
					ptr = ParseField(file->cf_User, line.cl_Hrs, 24, 0, NULL, ptr);
					ptr = ParseField(file->cf_User, line.cl_Days, 32, 0, NULL, ptr);
					ptr = ParseField(file->cf_User, line.cl_Mons, 12, -1, MonAry, ptr);
					ptr = ParseField(file->cf_User, line.cl_Dow, 7, 0, DowAry, ptr);

					/* check failure */
					if (ptr == NULL) {
						continue;
					}

					/*
					 * fix days and dow - if one is not * and the other
					 * is *, the other is set to 0, and vise-versa
					 */

					FixDayDow(&line);

					*pline = xzalloc(sizeof(CronLine));
					**pline = line;

					/* copy command */
					(*pline)->cl_Shell = strdup(ptr);

#if ENABLE_DEBUG_CROND_OPTION
					if (DebugOpt) {
						crondlog("\111    Command %s\n", ptr);
					}
#endif

					pline = &((*pline)->cl_Next);
				}
				*pline = NULL;

				file->cf_Next = FileBase;
				FileBase = file;

				if (maxLines == 0 || maxEntries == 0) {
					crondlog("\111Maximum number of lines reached for user %s\n", fileName);
				}
			}
			fclose(fi);
		}
	}
}

static void CheckUpdates(void)
{
	FILE *fi;
	char buf[256];

	fi = fopen(CRONUPDATE, "r");
	if (fi != NULL) {
		unlink(CRONUPDATE);
		while (fgets(buf, sizeof(buf), fi) != NULL) {
			SynchronizeFile(strtok(buf, " \t\r\n"));
		}
		fclose(fi);
	}
}

static void SynchronizeDir(void)
{
	/* Attempt to delete the database. */

	for (;;) {
		CronFile *file;

		for (file = FileBase; file && file->cf_Deleted; file = file->cf_Next);
		if (file == NULL) {
			break;
		}
		DeleteFile(file->cf_User);
	}

	/*
	 * Remove cron update file
	 *
	 * Re-chdir, in case directory was renamed & deleted, or otherwise
	 * screwed up.
	 *
	 * scan directory and add associated users
	 */

	unlink(CRONUPDATE);
	if (chdir(CDir) < 0) {
		crondlog("\311cannot find %s\n", CDir);
	}
	{
		DIR *dir = opendir(".");
		struct dirent *den;

		if (dir) {
			while ((den = readdir(dir))) {
				if (strchr(den->d_name, '.') != NULL) {
					continue;
				}
				if (getpwnam(den->d_name)) {
					SynchronizeFile(den->d_name);
				} else {
					crondlog("\007ignoring %s\n", den->d_name);
				}
			}
			closedir(dir);
		} else {
			crondlog("\311cannot open current dir!\n");
		}
	}
}


/*
 *  DeleteFile() - delete user database
 *
 *  Note: multiple entries for same user may exist if we were unable to
 *  completely delete a database due to running processes.
 */

static void DeleteFile(const char *userName)
{
	CronFile **pfile = &FileBase;
	CronFile *file;

	while ((file = *pfile) != NULL) {
		if (strcmp(userName, file->cf_User) == 0) {
			CronLine **pline = &file->cf_LineBase;
			CronLine *line;

			file->cf_Running = 0;
			file->cf_Deleted = 1;

			while ((line = *pline) != NULL) {
				if (line->cl_Pid > 0) {
					file->cf_Running = 1;
					pline = &line->cl_Next;
				} else {
					*pline = line->cl_Next;
					free(line->cl_Shell);
					free(line);
				}
			}
			if (file->cf_Running == 0) {
				*pfile = file->cf_Next;
				free(file->cf_User);
				free(file);
			} else {
				pfile = &file->cf_Next;
			}
		} else {
			pfile = &file->cf_Next;
		}
	}
}

/*
 * TestJobs()
 *
 * determine which jobs need to be run.  Under normal conditions, the
 * period is about a minute (one scan).  Worst case it will be one
 * hour (60 scans).
 */

static int TestJobs(time_t t1, time_t t2)
{
	int nJobs = 0;
	time_t t;

	/* Find jobs > t1 and <= t2 */

	for (t = t1 - t1 % 60; t <= t2; t += 60) {
		if (t > t1) {
			struct tm *tp = localtime(&t);
			CronFile *file;
			CronLine *line;

			for (file = FileBase; file; file = file->cf_Next) {
#if ENABLE_DEBUG_CROND_OPTION
				if (DebugOpt)
					crondlog("\005FILE %s:\n", file->cf_User);
#endif
				if (file->cf_Deleted)
					continue;
				for (line = file->cf_LineBase; line; line = line->cl_Next) {
#if ENABLE_DEBUG_CROND_OPTION
					if (DebugOpt)
						crondlog("\005    LINE %s\n", line->cl_Shell);
#endif
					if (line->cl_Mins[tp->tm_min] && line->cl_Hrs[tp->tm_hour] &&
						(line->cl_Days[tp->tm_mday] || line->cl_Dow[tp->tm_wday])
						&& line->cl_Mons[tp->tm_mon]) {
#if ENABLE_DEBUG_CROND_OPTION
						if (DebugOpt) {
							crondlog("\005    JobToDo: %d %s\n",
								line->cl_Pid, line->cl_Shell);
						}
#endif
						if (line->cl_Pid > 0) {
							crondlog("\010    process already running: %s %s\n",
								file->cf_User, line->cl_Shell);
						} else if (line->cl_Pid == 0) {
							line->cl_Pid = -1;
							file->cf_Ready = 1;
							++nJobs;
						}
					}
				}
			}
		}
	}
	return nJobs;
}

static void RunJobs(void)
{
	CronFile *file;
	CronLine *line;

	for (file = FileBase; file; file = file->cf_Next) {
		if (file->cf_Ready) {
			file->cf_Ready = 0;

			for (line = file->cf_LineBase; line; line = line->cl_Next) {
				if (line->cl_Pid < 0) {

					RunJob(file->cf_User, line);

					crondlog("\010USER %s pid %3d cmd %s\n",
						file->cf_User, line->cl_Pid, line->cl_Shell);
					if (line->cl_Pid < 0) {
						file->cf_Ready = 1;
					}
					else if (line->cl_Pid > 0) {
						file->cf_Running = 1;
					}
				}
			}
		}
	}
}

/*
 * CheckJobs() - check for job completion
 *
 * Check for job completion, return number of jobs still running after
 * all done.
 */

static int CheckJobs(void)
{
	CronFile *file;
	CronLine *line;
	int nStillRunning = 0;

	for (file = FileBase; file; file = file->cf_Next) {
		if (file->cf_Running) {
			file->cf_Running = 0;

			for (line = file->cf_LineBase; line; line = line->cl_Next) {
				if (line->cl_Pid > 0) {
					int status;
					int r = waitpid(line->cl_Pid, &status, WNOHANG);

					if (r < 0 || r == line->cl_Pid) {
						EndJob(file->cf_User, line);
						if (line->cl_Pid) {
							file->cf_Running = 1;
						}
					} else if (r == 0) {
						file->cf_Running = 1;
					}
				}
			}
		}
		nStillRunning += file->cf_Running;
	}
	return nStillRunning;
}


#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
static void
ForkJob(const char *user, CronLine * line, int mailFd,
		const char *prog, const char *cmd, const char *arg,
		const char *mail_filename)
{
	/* Fork as the user in question and run program */
	pid_t pid = fork();

	line->cl_Pid = pid;
	if (pid == 0) {
		/* CHILD */
		/* Change running state to the user in question */

		if (ChangeUser(user) < 0) {
			exit(0);
		}
#if ENABLE_DEBUG_CROND_OPTION
		if (DebugOpt) {
			crondlog("\005Child Running %s\n", prog);
		}
#endif

		if (mailFd >= 0) {
			xmove_fd(mailFd, mail_filename ? 1 : 0);
			dup2(1, 2);
		}
		execl(prog, prog, cmd, arg, NULL);
		crondlog("\024cannot exec, user %s cmd %s %s %s\n", user, prog, cmd, arg);
		if (mail_filename) {
			fdprintf(1, "Exec failed: %s -c %s\n", prog, arg);
		}
		exit(0);
	}

	if (pid < 0) {
		/* FORK FAILED */
		crondlog("\024cannot fork\n");
		line->cl_Pid = 0;
		if (mail_filename) {
			unlink(mail_filename);
		}
	} else if (mail_filename) {
		/* PARENT, FORK SUCCESS
		 * rename mail-file based on pid of process
		 */
		char mailFile2[128];

		snprintf(mailFile2, sizeof(mailFile2), TMPDIR "/cron.%s.%d", user, pid);
		rename(mail_filename, mailFile2); // TODO: xrename?
	}
	/*
	 * Close the mail file descriptor.. we can't just leave it open in
	 * a structure, closing it later, because we might run out of descriptors
	 */

	if (mailFd >= 0) {
		close(mailFd);
	}
}

static void RunJob(const char *user, CronLine * line)
{
	char mailFile[128];
	int mailFd;

	line->cl_Pid = 0;
	line->cl_MailFlag = 0;

	/* open mail file - owner root so nobody can screw with it. */

	snprintf(mailFile, sizeof(mailFile), TMPDIR "/cron.%s.%d", user, getpid());
	mailFd = open(mailFile, O_CREAT | O_TRUNC | O_WRONLY | O_EXCL | O_APPEND, 0600);

	if (mailFd >= 0) {
		line->cl_MailFlag = 1;
		fdprintf(mailFd, "To: %s\nSubject: cron: %s\n\n", user,
			line->cl_Shell);
		line->cl_MailPos = lseek(mailFd, 0, SEEK_CUR);
	} else {
		crondlog("\024cannot create mail file user %s file %s, output to /dev/null\n", user, mailFile);
	}

	ForkJob(user, line, mailFd, DEFAULT_SHELL, "-c", line->cl_Shell, mailFile);
}

/*
 * EndJob - called when job terminates and when mail terminates
 */

static void EndJob(const char *user, CronLine * line)
{
	int mailFd;
	char mailFile[128];
	struct stat sbuf;

	/* No job */

	if (line->cl_Pid <= 0) {
		line->cl_Pid = 0;
		return;
	}

	/*
	 * End of job and no mail file
	 * End of sendmail job
	 */

	snprintf(mailFile, sizeof(mailFile), TMPDIR "/cron.%s.%d", user, line->cl_Pid);
	line->cl_Pid = 0;

	if (line->cl_MailFlag != 1) {
		return;
	}
	line->cl_MailFlag = 0;

	/*
	 * End of primary job - check for mail file.  If size has increased and
	 * the file is still valid, we sendmail it.
	 */

	mailFd = open(mailFile, O_RDONLY);
	unlink(mailFile);
	if (mailFd < 0) {
		return;
	}

	if (fstat(mailFd, &sbuf) < 0 || sbuf.st_uid != DaemonUid
	 || sbuf.st_nlink != 0 || sbuf.st_size == line->cl_MailPos
	 || !S_ISREG(sbuf.st_mode)
	) {
		close(mailFd);
		return;
	}
	ForkJob(user, line, mailFd, SENDMAIL, SENDMAIL_ARGS, NULL);
}
#else
/* crond without sendmail */

static void RunJob(const char *user, CronLine * line)
{
	/* Fork as the user in question and run program */
	pid_t pid = fork();

	if (pid == 0) {
		/* CHILD */

		/* Change running state to the user in question */

		if (ChangeUser(user) < 0) {
			exit(0);
		}
#if ENABLE_DEBUG_CROND_OPTION
		if (DebugOpt) {
			crondlog("\005Child Running %s\n", DEFAULT_SHELL);
		}
#endif

		execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", line->cl_Shell, NULL);
		crondlog("\024cannot exec, user %s cmd %s -c %s\n", user,
				 DEFAULT_SHELL, line->cl_Shell);
		exit(0);
	} else if (pid < 0) {
		/* FORK FAILED */
		crondlog("\024cannot, user %s\n", user);
		pid = 0;
	}
	line->cl_Pid = pid;
}
#endif /* ENABLE_FEATURE_CROND_CALL_SENDMAIL */