1 /*	$OpenBSD: worklist.c,v 1.4 2015/06/13 20:15:21 nicm 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 <stdlib.h>
32 #include <stdio.h>
33 #include <string.h>
34 #include <unistd.h>
35 
36 #include "worklist.h"
37 #include "got_error.h"
38 
39 /*
40  * adds a path to a worklist.
41  */
42 const struct got_error *
43 worklist_add(const char *path, struct wklhead *worklist)
44 {
45 	size_t len;
46 	struct worklist *wkl;
47 	sigset_t old, new;
48 
49 	wkl = calloc(1, sizeof(*wkl));
50 	if (wkl == NULL)
51 		return got_error_from_errno("calloc");
52 
53 	len = strlcpy(wkl->wkl_path, path, sizeof(wkl->wkl_path));
54 	if (len >= sizeof(wkl->wkl_path))
55 		return got_error(GOT_ERR_NO_SPACE);
56 
57 	sigfillset(&new);
58 	sigprocmask(SIG_BLOCK, &new, &old);
59 	SLIST_INSERT_HEAD(worklist, wkl, wkl_list);
60 	sigprocmask(SIG_SETMASK, &old, NULL);
61 	return NULL;
62 }
63 
64 /*
65  * run over the given worklist, calling cb for each element.
66  * this is just like worklist_clean(), except we block signals first.
67  */
68 void
69 worklist_run(struct wklhead *list, void (*cb)(struct worklist *))
70 {
71 	sigset_t old, new;
72 	struct worklist *wkl;
73 
74 	sigfillset(&new);
75 	sigprocmask(SIG_BLOCK, &new, &old);
76 
77 	worklist_clean(list, cb);
78 
79 	while ((wkl = SLIST_FIRST(list)) != NULL) {
80 		SLIST_REMOVE_HEAD(list, wkl_list);
81 		free(wkl);
82 	}
83 
84 	sigprocmask(SIG_SETMASK, &old, NULL);
85 }
86 
87 /*
88  * pass elements to the specified callback, which has to be signal safe.
89  */
90 void
91 worklist_clean(struct wklhead *list, void (*cb)(struct worklist *))
92 {
93 	struct worklist *wkl;
94 
95 	SLIST_FOREACH(wkl, list, wkl_list)
96 	    cb(wkl);
97 }
98 
99 void
100 worklist_unlink(struct worklist *wkl)
101 {
102 	(void)unlink(wkl->wkl_path);
103 }