libexec/cron/job.c

   1 /* Copyright 1988,1990,1993 by Paul Vixie
   2  * All rights reserved
   3  *
   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
  11  * user.
  12  *
  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
  16  */
  17
  18 #if !defined(lint) && !defined(LINT)
  19 static char rcsid[] = "$Id: job.c,v 1.1 1994/01/05 20:40:15 jtc Exp $";
  20 #endif
  21
  22
  23 #include "cron.h"
  24 #include "externs.h"
  25
  26
  27 typedef struct _job {
  28         struct _job     *next;
  29         entry           *e;
  30         user            *u;
  31 } job;
  32
  33
  34 static job      *jhead = NULL, *jtail = NULL;
  35
  36
  37 void
  38 job_add(e, u)
  39         register entry *e;
  40         register user *u;
  41 {
  42         register job *j;
  43
  44         /* if already on queue, keep going */
  45         for (j=jhead; j; j=j->next)
  46                 if (j->e == e && j->u == u) { return; }
  47
  48         /* build a job queue element */
  49         j = (job*)malloc(sizeof(job));
  50         j->next = (job*) NULL;
  51         j->e = e;
  52         j->u = u;
  53
  54         /* add it to the tail */
  55         if (!jhead) { jhead=j; }
  56         else { jtail->next=j; }
  57         jtail = j;
  58 }
  59
  60
  61 int
  62 job_runqueue()
  63 {
  64         register job    *j, *jn;
  65         register int    run = 0;
  66
  67         for (j=jhead; j; j=jn) {
  68                 do_command(j->e, j->u);
  69                 jn = j->next;
  70                 free(j);
  71                 run++;
  72         }
  73         jhead = jtail = NULL;
  74         return run;
  75 }