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 		free(wkl);
56 		return got_error(GOT_ERR_NO_SPACE);
57 	}
58 
59 	sigfillset(&new);
60 	sigprocmask(SIG_BLOCK, &new, &old);
61 	SLIST_INSERT_HEAD(worklist, wkl, wkl_list);
62 	sigprocmask(SIG_SETMASK, &old, NULL);
63 	return NULL;
64 }
65 
66 /*
67  * run over the given worklist, calling cb for each element.
68  * this is just like worklist_clean(), except we block signals first.
69  */
70 void
71 worklist_run(struct wklhead *list, void (*cb)(struct worklist *))
72 {
73 	sigset_t old, new;
74 	struct worklist *wkl;
75 
76 	sigfillset(&new);
77 	sigprocmask(SIG_BLOCK, &new, &old);
78 
79 	worklist_clean(list, cb);
80 
81 	while ((wkl = SLIST_FIRST(list)) != NULL) {
82 		SLIST_REMOVE_HEAD(list, wkl_list);
83 		free(wkl);
84 	}
85 
86 	sigprocmask(SIG_SETMASK, &old, NULL);
87 }
88 
89 /*
90  * pass elements to the specified callback, which has to be signal safe.
91  */
92 void
93 worklist_clean(struct wklhead *list, void (*cb)(struct worklist *))
94 {
95 	struct worklist *wkl;
96 
97 	SLIST_FOREACH(wkl, list, wkl_list)
98 	    cb(wkl);
99 }
100 
101 void
102 worklist_unlink(struct worklist *wkl)
103 {
104 	(void)unlink(wkl->wkl_path);
105 }