usr.sbin/cron/job.c

/* Copyright 1988,1990,1993,1994 by Paul Vixie
 * All rights reserved
 *
 * Distribute freely, except: don't remove my name from the source or
 * documentation (don't take credit for my work), mark your changes (don't
 * get me blamed for your possible bugs), don't alter or remove this
 * notice.  May be sold if buildable source is provided to buyer.  No
 * warrantee of any kind, express or implied, is included with this
 * software; use at your own risk, responsibility for damages (if any) to
 * anyone resulting from the use of this software rests entirely with the
 * user.
 *
 * Send bug reports, bug fixes, enhancements, requests, flames, etc., and
 * I'll try to keep a version up to date.  I can be reached as follows:
 * Paul Vixie          <paul@vix.com>          uunet!decwrl!vixie!paul
 * From Id: job.c,v 1.6 1994/01/15 20:43:43 vixie Exp
 */

#if !defined(lint) && !defined(LINT)
static char rcsid[] = "$Header: $";
#endif


#include "cron.h"


typedef struct _job {
        struct _job     *next;
        entry           *e;
        user            *u;
} job;


static job      *jhead = NULL, *jtail = NULL;


void
job_add(e, u)
        register entry *e;
        register user *u;
{
        register job *j;

        /* if already on queue, keep going */
        for (j=jhead; j; j=j->next)
                if (j->e == e && j->u == u) { return; }

        /* build a job queue element */
        j = (job*)malloc(sizeof(job));
        j->next = (job*) NULL;
        j->e = e;
        j->u = u;

        /* add it to the tail */
        if (!jhead) { jhead=j; }
        else { jtail->next=j; }
        jtail = j;
}


int
job_runqueue()
{
        register job    *j, *jn;
        register int    run = 0;

        for (j=jhead; j; j=jn) {
                do_command(j->e, j->u);
                jn = j->next;
                free(j);
                run++;
        }
        jhead = jtail = NULL;
        return run;
}