worklist.c revision 1.3 
1/*	$OpenBSD: worklist.c,v 1.3 2010/07/23 08:31:19 ray Exp $	*/
2/*
3 * Copyright (c) 2006 Joris Vink <joris@openbsd.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. The name of the author may not be used to endorse or promote products
13 *    derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
16 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
17 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
18 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/queue.h>
28
29#include <err.h>
30#include <signal.h>
31#include <string.h>
32#include <unistd.h>
33
34#include "worklist.h"
35#include "xmalloc.h"
36
37/*
38 * adds a path to a worklist.
39 */
40void
41worklist_add(const char *path, struct wklhead *worklist)
42{
43	size_t len;
44	struct worklist *wkl;
45	sigset_t old, new;
46
47	wkl = xcalloc(1, sizeof(*wkl));
48
49	len = strlcpy(wkl->wkl_path, path, sizeof(wkl->wkl_path));
50	if (len >= sizeof(wkl->wkl_path))
51		errx(1, "path truncation in worklist_add");
52
53	sigfillset(&new);
54	sigprocmask(SIG_BLOCK, &new, &old);
55	SLIST_INSERT_HEAD(worklist, wkl, wkl_list);
56	sigprocmask(SIG_SETMASK, &old, NULL);
57}
58
59/*
60 * run over the given worklist, calling cb for each element.
61 * this is just like worklist_clean(), except we block signals first.
62 */
63void
64worklist_run(struct wklhead *list, void (*cb)(struct worklist *))
65{
66	sigset_t old, new;
67	struct worklist *wkl;
68
69	sigfillset(&new);
70	sigprocmask(SIG_BLOCK, &new, &old);
71
72	worklist_clean(list, cb);
73
74	while ((wkl = SLIST_FIRST(list)) != NULL) {
75		SLIST_REMOVE_HEAD(list, wkl_list);
76		xfree(wkl);
77	}
78
79	sigprocmask(SIG_SETMASK, &old, NULL);
80}
81
82/*
83 * pass elements to the specified callback, which has to be signal safe.
84 */
85void
86worklist_clean(struct wklhead *list, void (*cb)(struct worklist *))
87{
88	struct worklist *wkl;
89
90	SLIST_FOREACH(wkl, list, wkl_list)
91	    cb(wkl);
92}
93
94void
95worklist_unlink(struct worklist *wkl)
96{
97	(void)unlink(wkl->wkl_path);
98}
99