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Sync with ISC cron-current + my at(1) integration.
The at(1) code is now more tightly integrated into the cron codebase.

/*	$OpenBSD: job.c,v 1.6 2003/02/20 20:38:08 millert Exp $	*/

/* Copyright 1988,1990,1993,1994 by Paul Vixie
 * All rights reserved
 */

/*
 * Copyright (c) 1997,2000 by Internet Software Consortium, Inc.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#if !defined(lint) && !defined(LINT)
static char const rcsid[] = "$OpenBSD: job.c,v 1.6 2003/02/20 20:38:08 millert Exp $";
#endif

#include "cron.h"

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

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

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

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

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

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

int
job_runqueue(void) {
	job *j, *jn;
	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);
}