minix/commands/cron/tab.h

   1 /*      tab.h - in-core crontab data                    Author: Kees J. Bot
   2  *                                                              7 Dec 1996
   3  */
   4 #ifndef TAB__H
   5 #define TAB__H
   6
   7 #include <sys/types.h>
   8 #include <limits.h>
   9
  10 struct crontab;
  11
  12 typedef unsigned char bitmap_t[8];
  13
  14 typedef struct cronjob {        /* One entry in a crontab file */
  15         struct cronjob  *next;
  16         struct crontab  *tab;           /* Associated table file. */
  17         bitmap_t        min;            /* Minute (0-59) */
  18         bitmap_t        hour;           /* Hour (0-23) */
  19         bitmap_t        mday;           /* Day of the month (1-31) */
  20         bitmap_t        mon;            /* Month (1-12) */
  21         bitmap_t        wday;           /* Weekday (0-7 with 0 = 7 = Sunday) */
  22         char            *user;          /* User to run it as (nil = root) */
  23         char            *cmd;           /* Command to run */
  24         time_t          rtime;          /* When next to run */
  25         char            do_mday;        /* True iff mon or mday is not '*' */
  26         char            do_wday;        /* True iff wday is not '*' */
  27         char            late;           /* True iff the job is late */
  28         char            atjob;          /* True iff it is an AT job */
  29         pid_t           pid;            /* Process-id of job if nonzero */
  30 } cronjob_t;
  31
  32 typedef struct crontab {
  33         struct crontab  *next;
  34         char            *file;          /* Crontab name */
  35         char            *user;          /* Owner if non-null */
  36         time_t          mtime;          /* Last modified time */
  37         cronjob_t       *jobs;          /* List of jobs in the file */
  38         char            *data;          /* File data */
  39         int             current;        /* True if current, i.e. file exists */
  40 } crontab_t;
  41
  42 crontab_t *crontabs;            /* All crontabs. */
  43
  44 /* A time as far in the future as possible. */
  45 #define NEVER           ((time_t) ((time_t) -1 < 0 ? LONG_MAX : ULONG_MAX))
  46
  47 /* Don't trust crontabs bigger than this: */
  48 #define TAB_MAX         ((sizeof(int) == 2 ? 8 : 128) * 1024)
  49
  50 /* Pid if no process running, or a pid value you'll never see. */
  51 #define IDLE_PID        ((pid_t) 0)
  52 #define NO_PID          ((pid_t) -1)
  53
  54 /* Bitmap operations. */
  55 #define bit_set(map, n)         ((void) ((map)[(n) >> 3] |= (1 << ((n) & 7))))
  56 #define bit_clr(map, n)         ((void) ((map)[(n) >> 3] &= ~(1 << ((n) & 7))))
  57 #define bit_isset(map, n)       (!!((map)[(n) >> 3] & (1 << ((n) & 7))))
  58
  59 /* Functions. */
  60 void tab_parse(char *file, char *user);
  61 void tab_find_atjob(char *atdir);
  62 void tab_purge(void);
  63 void tab_reap_job(pid_t pid);
  64 void tab_reschedule(cronjob_t *job);
  65 cronjob_t *tab_nextjob(void);
  66 void tab_print(FILE *fp);
  67
  68 #endif /* TAB__H */
  69
  70 /*
  71  * $PchId: tab.h,v 1.3 2000/07/17 07:57:27 philip Exp $
  72  */