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      1 /* crond.c - daemon to execute scheduled commands.
      2  *
      3  * Copyright 2014 Ranjan Kumar <ranjankumar.bth (at) gmail.com>
      4  *
      5  * No Standard
      6 
      7 USE_CROND(NEWTOY(crond, "fbSl#<0=8d#<0L:c:[-bf][-LS][-ld]", TOYFLAG_USR|TOYFLAG_SBIN|TOYFLAG_NEEDROOT))
      8 
      9 config CROND
     10   bool "crond"
     11   default n
     12   help
     13     usage: crond [-fbS] [-l N] [-d N] [-L LOGFILE] [-c DIR]
     14 
     15     A daemon to execute scheduled commands.
     16 
     17     -b Background (default)
     18     -c crontab dir
     19     -d Set log level, log to stderr
     20     -f Foreground
     21     -l Set log level. 0 is the most verbose, default 8
     22     -S Log to syslog (default)
     23     -L Log to file
     24 */
     25 
     26 #define FOR_crond
     27 #include "toys.h"
     28 
     29 GLOBALS(
     30   char *crontabs_dir;
     31   char *logfile;
     32   int loglevel_d;
     33   int loglevel;
     34 
     35   time_t crontabs_dir_mtime;
     36   uint8_t flagd;
     37 )
     38 
     39 typedef struct _var {
     40   struct _var *next, *prev;
     41   char *name, *val;
     42 } VAR;
     43 
     44 typedef struct _job {
     45   struct _job *next, *prev;
     46   char min[60], hour[24], dom[31], mon[12], dow[7], *cmd;
     47   int isrunning, needstart, mailsize;
     48   pid_t pid;
     49 } JOB;
     50 
     51 typedef struct _cronfile {
     52   struct _cronfile *next, *prev;
     53   struct double_list *job, *var;
     54   char *username, *mailto;
     55   int invalid;
     56 } CRONFILE;
     57 
     58 static char days[]={"sun""mon""tue""wed""thu""fri""sat"};
     59 static char months[]={"jan""feb""mar""apr""may""jun""jul"
     60   "aug""sep""oct""nov""dec"};
     61 CRONFILE *gclist;
     62 
     63 #define LOG_EXIT 0
     64 #define LOG_LEVEL5 5
     65 #define LOG_LEVEL7 7
     66 #define LOG_LEVEL8 8
     67 #define LOG_LEVEL9 9 // warning
     68 #define LOG_ERROR 20
     69 
     70 static void loginfo(uint8_t loglevel, char *msg, ...)
     71 {
     72   va_list s, d;
     73 
     74   va_start(s, msg);
     75   va_copy(d, s);
     76   if (loglevel >= TT.loglevel) {
     77     int used;
     78     char *smsg;
     79 
     80     if (!TT.flagd && TT.logfile) {
     81       int fd = open(TT.logfile, O_WRONLY | O_CREAT | O_APPEND, 0666);
     82       if (fd==-1) perror_msg("'%s", TT.logfile);
     83       else {
     84         dup2(fd, 2);
     85         close(fd);
     86       }
     87     }
     88     used = vsnprintf(NULL, 0, msg, d);
     89     smsg = xzalloc(++used);
     90     vsnprintf(smsg, used, msg, s);
     91     if (TT.flagd || TT.logfile) {
     92       fflush(NULL);
     93       smsg[used-1] = '\n';
     94       writeall((loglevel > 8) ? 2 : 1, smsg, used);
     95     } else syslog((loglevel > 8) ? LOG_ERR : LOG_INFO, "%s", smsg);
     96     free(smsg);
     97   }
     98   va_end(d);
     99   va_end(s);
    100   if (!loglevel) exit(20);
    101 }
    102 
    103 /*
    104  * Names can also be used for the 'month' and 'day of week' fields
    105  * (First three letters of the particular day or month).
    106  */
    107 static int getindex(char *src, int size)
    108 {
    109   int i;
    110   char *field = (size == 12) ? months : days;
    111 
    112   // strings are not allowed for min, hour and dom fields.
    113   if (!(size == 7 || size == 12)) return -1;
    114 
    115   for (i = 0; field[i]; i += 3) {
    116     if (!strncasecmp(src, &field[i], 3))
    117       return (i/3);
    118   }
    119   return -1;
    120 }
    121 
    122 // set elements of minute, hour, day of month, month and day of week arrays.
    123 static void fillarray(char *dst, int start, int end, int skip)
    124 {
    125   int sk = 1;
    126 
    127   if (end < 0) {
    128     dst[start] = 1;
    129     return;
    130   }
    131   if (!skip) skip = 1;
    132   do {
    133     if (!--sk) {
    134       dst[start] = 1;
    135       sk = skip;
    136     }
    137   } while (start++ != end);
    138 }
    139 
    140 static long getval(char *num, long low, long high)
    141 {
    142   long val = strtol(num, &num, 10);
    143 
    144   if (*num || (val < low) || (val > high)) return -1;
    145   return val;
    146 }
    147 
    148 //static int parse_and_fillarray(char *dst, int size, char *src)
    149 static int parse_and_fillarray(char *dst, int min, int max, char *src)
    150 {
    151   int start, end, skip = 0;
    152   char *ptr = strchr(src, '/');
    153 
    154   if (ptr) {
    155     *ptr++ = 0;
    156     if ((skip = getval(ptr, min, (min ? max: max-1))) < 0) goto ERROR;
    157   }
    158 
    159   if (*src == '-' || *src == ',') goto ERROR;
    160   if (*src == '*') {
    161     if (*(src+1)) goto ERROR;
    162     fillarray(dst, 0, max-1, skip);
    163   } else {
    164     for (;;) {
    165       char *ctoken = strsep(&src, ","), *dtoken;
    166 
    167       if (!ctoken) break;
    168       if (!*ctoken) goto ERROR;
    169 
    170       // Get start position.
    171       dtoken = strsep(&ctoken, "-");
    172       if (isdigit(*dtoken)) {
    173         if ((start = getval(dtoken, min, (min ? max : max-1))) < 0) goto ERROR;
    174         start = min ? (start-1) : start;
    175       } else if ((start = getindex(dtoken, max)) < 0) goto ERROR;
    176 
    177       // Get end position.
    178       if (!ctoken) end = -1; // e.g. N1,N2,N3
    179       else if (*ctoken) {// e.g. N-M
    180         if (isdigit(*ctoken)) {
    181           if ((end = getval(ctoken, min, (min ? max : max-1))) < 0) goto ERROR;
    182           end = min ? (end-1) : end;
    183         } else if ((end = getindex(ctoken, max)) < 0) goto ERROR;
    184         if (end == start) end = -1;
    185       } else goto ERROR; // error condition 'N-'
    186       fillarray(dst, start, end, skip);
    187     }
    188   }
    189 
    190   if (TT.flagd && (TT.loglevel <= 5)) {
    191     for (start = 0; start < max; start++)
    192       fprintf(stderr, "%d", (unsigned char)dst[start]);
    193     fputc('\n', stderr);
    194   }
    195   return 0;
    196 ERROR:
    197   loginfo(LOG_LEVEL9, "parse error at %s", src);
    198   return -1;
    199 }
    200 
    201 static char *omitspace(char *line)
    202 {
    203   while (*line == ' ' || *line == '\t') line++;
    204   return line;
    205 }
    206 
    207 static void parse_line(char *line, CRONFILE *cfile)
    208 {
    209   int count = 0;
    210   char *name, *val, *tokens[5] = {0,};
    211   VAR *v;
    212   JOB *j;
    213 
    214   line = omitspace(line);
    215   if (!*line || *line == '#') return;
    216 
    217   /*
    218    * TODO: Enhancement to support 8 special strings
    219    * @reboot -> Run once at startup.
    220    * @yearly -> Run once a year (0 0 1 1 *).
    221    * @annually -> Same as above.
    222    * @monthly -> Run once a month (0 0 1 * *).
    223    * @weekly -> Run once a week (0 0 * * 0).
    224    * @daily -> Run once a day (0 0 * * *).
    225    * @midnight -> same as above.
    226    * @hourly -> Run once an hour (0 * * * *).
    227    */
    228   if (*line == '@') return;
    229   if (TT.flagd) loginfo(LOG_LEVEL5, "user:%s entry:%s", cfile->username, line);
    230   while (count<5) {
    231     int len = strcspn(line, " \t");
    232 
    233     if (line[len]) line[len++] = '\0';
    234     tokens[count++] = line;
    235     line += len;
    236     line = omitspace(line);
    237     if (!*line) break;
    238   }
    239 
    240   switch (count) {
    241     case 1: // form SHELL=/bin/sh
    242       name = tokens[0];
    243       if ((val = strchr(name, '='))) *val++ = 0;
    244       if (!val || !*val) return;
    245       break;
    246     case 2: // form SHELL =/bin/sh or SHELL= /bin/sh
    247       name = tokens[0];
    248       if ((val = strchr(name, '='))) {
    249         *val = 0;
    250         val = tokens[1];
    251       } else {
    252         if (*(tokens[1]) != '=') return;
    253         val = tokens[1] + 1;
    254       }
    255       if (!*val) return;
    256       break;
    257     case 3: // NAME = VAL
    258       name = tokens[0];
    259       val = tokens[2];
    260       if (*(tokens[1]) != '=') return;
    261       break;
    262     case 5:
    263       // don't have any cmd to execute.
    264       if (!*line) return;
    265       j = xzalloc(sizeof(JOB));
    266 
    267       if (parse_and_fillarray(j->min, 0, sizeof(j->min), tokens[0]))
    268         goto STOP_PARSING;
    269       if (parse_and_fillarray(j->hour, 0, sizeof(j->hour), tokens[1]))
    270         goto STOP_PARSING;
    271       if (parse_and_fillarray(j->dom, 1, sizeof(j->dom), tokens[2]))
    272         goto STOP_PARSING;
    273       if (parse_and_fillarray(j->mon, 1, sizeof(j->mon), tokens[3]))
    274         goto STOP_PARSING;
    275       if (parse_and_fillarray(j->dow, 0, sizeof(j->dow), tokens[4]))
    276         goto STOP_PARSING;
    277       j->cmd = xstrdup(line);
    278 
    279       if (TT.flagd) loginfo(LOG_LEVEL5, " command:%s", j->cmd);
    280       dlist_add_nomalloc((struct double_list **)&cfile->job, (struct double_list *)j);
    281       return;
    282 STOP_PARSING:
    283       free(j);
    284       return;
    285     default: return;
    286   }
    287   if (!strcmp(name, "MAILTO")) cfile->mailto = xstrdup(val);
    288   else {
    289     v = xzalloc(sizeof(VAR));
    290     v->name = xstrdup(name);
    291     v->val = xstrdup(val);
    292     dlist_add_nomalloc((struct double_list **)&cfile->var, (struct double_list *)v);
    293   }
    294 }
    295 
    296 static void free_jobs(JOB **jlist)
    297 {
    298   JOB *j = dlist_pop(jlist);
    299   free(j->cmd);
    300   free(j);
    301 }
    302 
    303 static void free_cronfile(CRONFILE **list)
    304 {
    305   CRONFILE *l = dlist_pop(list);
    306   VAR *v, *vnode = (VAR *)l->var;
    307 
    308   if (l->username != l->mailto) free(l->mailto);
    309   free(l->username);
    310   while (vnode && (v = dlist_pop(&vnode))) {
    311     free(v->name);
    312     free(v->val);
    313     free(v);
    314   }
    315   free(l);
    316 }
    317 
    318 /*
    319  * Iterate all cronfiles to identify the completed jobs and freed them.
    320  * If all jobs got completed for a cronfile, freed cronfile too.
    321  */
    322 static void remove_completed_jobs()
    323 {
    324   CRONFILE *lstart, *list = gclist;
    325 
    326   lstart = list;
    327   while (list) {
    328     int delete = 1;
    329     JOB *jstart, *jlist = (JOB *)list->job;
    330 
    331     list->invalid = 1;
    332     jstart = jlist;
    333     while (jlist) {
    334       jlist->isrunning = 0;
    335       if (jlist->pid > 0) {
    336         jlist->isrunning = 1;
    337         delete = 0;
    338         jlist = jlist->next;
    339       } else {
    340         if (jlist == jstart) { // if 1st node has to delete.
    341           jstart = jstart->next;
    342           free_jobs(&jlist);
    343           continue;
    344         } else free_jobs(&jlist);
    345       }
    346       if (jlist == jstart) break;
    347     }
    348     list->job = (struct double_list *)jlist;
    349 
    350     if (delete) {
    351       if (lstart == list) {
    352         lstart = lstart->next;
    353         free_cronfile(&list);
    354         continue;
    355       } else free_cronfile(&list);
    356     }
    357     list = list->next;
    358     if (lstart == list) break;
    359   }
    360   gclist = list;
    361 }
    362 
    363 // Scan cronfiles and prepare the list of cronfiles with their jobs.
    364 static void scan_cronfiles()
    365 {
    366   DIR *dp;
    367   struct dirent *entry;
    368 
    369   remove_completed_jobs();
    370   if (chdir(TT.crontabs_dir)) loginfo(LOG_EXIT, "chdir(%s)", TT.crontabs_dir);
    371   if (!(dp = opendir("."))) loginfo(LOG_EXIT, "chdir(%s)", ".");
    372 
    373   while ((entry = readdir(dp))) {
    374     int fd;
    375     char *line;
    376     CRONFILE *cfile;
    377 
    378     if (entry->d_name[0] == '.' && (!entry->d_name[1] ||
    379           (entry->d_name[1] == '.' && !entry->d_name[2])))
    380       continue;
    381 
    382     if (!getpwnam(entry->d_name)) {
    383       loginfo(LOG_LEVEL7, "ignoring file '%s' (no such user)", entry->d_name);
    384       continue;
    385     }
    386     if ((fd = open(entry->d_name, O_RDONLY)) < 0) continue;
    387 
    388     // one node for each user
    389     cfile = xzalloc(sizeof(CRONFILE));
    390     cfile->username = xstrdup(entry->d_name);
    391 
    392     for (; (line = get_line(fd)); free(line))
    393       parse_line(line, cfile);
    394 
    395     // If there is no job for a cron, remove the VAR list.
    396     if (!cfile->job) {
    397       VAR *v, *vnode = (VAR *)cfile->var;
    398 
    399       free(cfile->username);
    400       if (cfile->mailto) free(cfile->mailto);
    401 
    402       while (vnode && (v = dlist_pop(&vnode))) {
    403         free(v->name);
    404         free(v->val);
    405         free(v);
    406       }
    407       free(cfile);
    408     } else {
    409       if (!cfile->mailto) cfile->mailto = cfile->username;
    410       dlist_add_nomalloc((struct double_list **)&gclist,
    411           (struct double_list *)cfile);
    412     }
    413     close(fd);
    414   }
    415   closedir(dp);
    416 }
    417 
    418 /*
    419  * Set env variables, if any in the cronfile. Execute given job with the given
    420  * SHELL or Default SHELL and send an e-mail with respect to every successfully
    421  * completed job (as per the given param 'prog').
    422  */
    423 static void do_fork(CRONFILE *cfile, JOB *job, int fd, char *prog)
    424 {
    425   pid_t pid = vfork();
    426 
    427   if (pid == 0) {
    428     VAR *v, *vstart = (VAR *)cfile->var;
    429     struct passwd *pwd = getpwnam(cfile->username);
    430 
    431     if (!pwd) loginfo(LOG_LEVEL9, "can't get uid for %s", cfile->username);
    432     else {
    433       char *file = "/bin/sh";
    434 
    435       if (setenv("USER", pwd->pw_name, 1)) _exit(1);
    436       for (v = vstart; v;) {
    437         if (!strcmp("SHELL", v->name)) file = v->val;
    438         if (setenv(v->name, v->val, 1)) _exit(1);
    439         if ((v=v->next) == vstart) break;
    440       }
    441       if (!getenv("HOME")) {
    442         if (setenv("HOME", pwd->pw_dir, 1))
    443           _exit(1);
    444       }
    445       xsetuser(pwd);
    446       if (chdir(pwd->pw_dir)) loginfo(LOG_LEVEL9, "chdir(%s)", pwd->pw_dir);
    447       if (prog) file = prog;
    448       if (TT.flagd) loginfo(LOG_LEVEL5, "child running %s", file);
    449 
    450       if (fd >= 0) {
    451         int newfd = prog ? 0 : 1;
    452         if (fd != newfd) {
    453           dup2(fd, newfd);
    454           close(fd);
    455         }
    456         dup2(1, 2);
    457       }
    458       setpgrp();
    459       execlp(file, file, (prog ? "-ti" : "-c"), (prog ? NULL : job->cmd), (char *) NULL);
    460       loginfo(LOG_ERROR, "can't execute '%s' for user %s", file, cfile->username);
    461 
    462       if (!prog) dprintf(1, "Exec failed: %s -c %s\n", file, job->cmd);
    463       _exit(EXIT_SUCCESS);
    464     }
    465   }
    466   if (pid < 0) {
    467     loginfo(LOG_ERROR, "can't vfork");
    468     pid = 0;
    469   }
    470   if (fd >=0) close(fd);
    471   job->pid = pid;
    472 }
    473 
    474 // Send an e-mail for each successfully completed jobs.
    475 static void sendmail(CRONFILE *cfile, JOB *job)
    476 {
    477   pid_t pid = job->pid;
    478   int mailfd;
    479   struct stat sb;
    480 
    481   job->pid = 0;
    482   if (pid <=0 || job->mailsize <=0) {
    483     job->isrunning = 0;
    484     job->needstart = 1;
    485     return;
    486   }
    487   snprintf(toybuf, sizeof(toybuf), "/var/spool/cron/cron.%s.%d",
    488       cfile->username, (int)pid);
    489 
    490   mailfd = open(toybuf, O_RDONLY);
    491   unlink(toybuf);
    492   if (mailfd < 0) return;
    493 
    494   if (fstat(mailfd, &sb) == -1 || sb.st_uid != 0 || sb.st_nlink != 0
    495       || sb.st_size == job->mailsize || !S_ISREG(sb.st_mode)) {
    496     xclose(mailfd);
    497     return;
    498   }
    499   job->mailsize = 0;
    500   do_fork(cfile, job, mailfd, "sendmail");
    501 }
    502 
    503 // Count the number of jobs, which are not completed.
    504 static int count_running_jobs()
    505 {
    506   CRONFILE *cfile = gclist;
    507   JOB *job, *jstart;
    508   int count = 0;
    509 
    510   while (cfile) {
    511     job = jstart = (JOB *)cfile->job;
    512     while (job) {
    513       int ret;
    514 
    515       if (!job->isrunning || job->pid<=0) goto NEXT_JOB;
    516       job->isrunning = 0;
    517       ret = waitpid(job->pid, NULL, WNOHANG);
    518       if (ret < 0 || ret == job->pid) {
    519         sendmail(cfile, job);
    520         if (job->pid) count += (job->isrunning=1);
    521         else {
    522           job->isrunning = 0;
    523           job->needstart = 1;
    524         }
    525       }
    526       else count += (job->isrunning=1);
    527 
    528 NEXT_JOB:
    529       if ((job = job->next) == jstart) break;
    530     }
    531     if ((cfile = cfile->next) == gclist) break;
    532   }
    533   return count;
    534 }
    535 
    536 // Execute jobs one by one and prepare for the e-mail sending.
    537 static void execute_jobs(void)
    538 {
    539   CRONFILE *cfile = gclist;
    540   JOB *job, *jstart;
    541 
    542   while (cfile) {
    543     job = jstart = (JOB *)cfile->job;
    544     while (job) {
    545       if (job->needstart) {
    546         job->needstart = 0;
    547         if (job->pid < 0) {
    548           int mailfd = -1;
    549 
    550           job->mailsize = job->pid = 0;
    551           snprintf(toybuf, sizeof(toybuf), "/var/spool/cron/cron.%s.%d",
    552               cfile->username, getpid());
    553           if ((mailfd = open(toybuf, O_CREAT|O_TRUNC|O_WRONLY|O_EXCL|O_APPEND,
    554                   0600)) < 0) {
    555             loginfo(LOG_ERROR, "can't create mail file %s for user %s, "
    556                 "discarding output", toybuf, cfile->username);
    557           } else {
    558             dprintf(mailfd, "To: %s\nSubject: cron: %s\n\n", cfile->mailto, job->cmd);
    559             job->mailsize = lseek(mailfd, 0, SEEK_CUR);
    560           }
    561           do_fork(cfile, job, mailfd, NULL);
    562           if (mailfd >= 0) {
    563             if (job->pid <= 0) unlink(toybuf);
    564             else {
    565               char *mailfile = xmprintf("/var/spool/cron/cron.%s.%d",
    566                   cfile->username, (int)job->pid);
    567               rename(toybuf, mailfile);
    568               free(mailfile);
    569             }
    570           }
    571           loginfo(LOG_LEVEL8, "USER %s pid %3d cmd %s",
    572               cfile->username, job->pid, job->cmd);
    573           if (job->pid < 0) job->needstart = 1;
    574           else job->isrunning = 1;
    575         }
    576       }
    577       if ((job = job->next) == jstart) break;
    578     }
    579     if ((cfile = cfile->next) == gclist) break;
    580   }
    581 }
    582 
    583 // Identify jobs, which needs to be started at the given time interval.
    584 static void schedule_jobs(time_t ctime, time_t ptime)
    585 {
    586   time_t tm = ptime-ptime%60;
    587 
    588   for (; tm <= ctime; tm += 60) {
    589     struct tm *lt;
    590     CRONFILE *cfile = gclist;
    591     JOB *job, *jstart;
    592 
    593     if (tm <= ptime) continue;
    594     lt = localtime(&tm);
    595 
    596     while (cfile) {
    597       if (TT.flagd) loginfo(LOG_LEVEL5, "file %s:", cfile->username);
    598       if (cfile->invalid) goto NEXT_CRONFILE;
    599       job = jstart = (JOB *)cfile->job;
    600 
    601       while (job) {
    602         if (TT.flagd) loginfo(LOG_LEVEL5, " line %s", job->cmd);
    603 
    604         if (job->min[lt->tm_min] && job->hour[lt->tm_hour]
    605             && (job->dom[lt->tm_mday] || job->dow[lt->tm_wday])
    606             && job->mon[lt->tm_mon-1]) {
    607           if (TT.flagd)
    608             loginfo(LOG_LEVEL5, " job: %d %s\n", (int)job->pid, job->cmd);
    609           if (job->pid > 0) {
    610             loginfo(LOG_LEVEL8, "user %s: process already running: %s",
    611                 cfile->username, job->cmd);
    612           } else if (!job->pid) {
    613             job->pid = -1;
    614             job->needstart = 1;
    615             job->isrunning = 0;
    616           }
    617         }
    618         if ((job = job->next) == jstart) break;
    619       }
    620 NEXT_CRONFILE:
    621       if ((cfile = cfile->next) == gclist) break;
    622     }
    623   }
    624 }
    625 
    626 void crond_main(void)
    627 {
    628   time_t ctime, ptime;
    629   int sleepfor = 60;
    630   struct stat sb;
    631 
    632   TT.flagd = (toys.optflags & FLAG_d);
    633 
    634   // Setting default params.
    635   if (TT.flagd) TT.loglevel = TT.loglevel_d;
    636   if (!(toys.optflags & (FLAG_f | FLAG_b))) toys.optflags |= FLAG_b;
    637   if (!(toys.optflags & (FLAG_S | FLAG_L))) toys.optflags |= FLAG_S;
    638 
    639   if ((toys.optflags & FLAG_c)
    640       && (TT.crontabs_dir[strlen(TT.crontabs_dir)-1] != '/'))
    641     TT.crontabs_dir = xmprintf("%s/", TT.crontabs_dir);
    642 
    643   if (!TT.crontabs_dir) TT.crontabs_dir = xstrdup("/var/spool/cron/crontabs/");
    644   if (toys.optflags & FLAG_b) daemon(0,0);
    645 
    646   if (!TT.flagd && !TT.logfile)
    647     openlog(toys.which->name, LOG_CONS | LOG_PID, LOG_CRON);
    648 
    649   // Set default shell once.
    650   if (setenv("SHELL", "/bin/sh", 1)) error_exit("Can't set default shell");
    651   xchdir(TT.crontabs_dir);
    652   loginfo(LOG_LEVEL8, "crond started, log level %d", TT.loglevel);
    653 
    654   if (stat(TT.crontabs_dir, &sb)) sb.st_mtime = 0;
    655   TT.crontabs_dir_mtime = sb.st_mtime;
    656   scan_cronfiles();
    657   ctime = time(NULL);
    658 
    659   while (1) {
    660     long tdiff;
    661 
    662     ptime = ctime;
    663     sleep(sleepfor - (ptime%sleepfor) +1);
    664     tdiff =(long) ((ctime = time(NULL)) - ptime);
    665 
    666     if (stat(TT.crontabs_dir, &sb)) sb.st_mtime = 0;
    667     if (TT.crontabs_dir_mtime != sb.st_mtime) {
    668       TT.crontabs_dir_mtime = sb.st_mtime;
    669       scan_cronfiles();
    670     }
    671 
    672     if (TT.flagd) loginfo(LOG_LEVEL5, "wakeup diff=%ld\n", tdiff);
    673     if (tdiff < -60 * 60 || tdiff > 60 * 60)
    674       loginfo(LOG_LEVEL9, "time disparity of %ld minutes detected", tdiff / 60);
    675     else if (tdiff > 0) {
    676       schedule_jobs(ctime, ptime);
    677       execute_jobs();
    678       if (count_running_jobs()) sleepfor = 10;
    679       else sleepfor = 60;
    680     }
    681   }
    682 }
    683