1 89fd757a 2019-02-07 stsp /*	$OpenBSD: worklist.c,v 1.4 2015/06/13 20:15:21 nicm Exp $	*/
  2 89fd757a 2019-02-07 stsp /*
  3 89fd757a 2019-02-07 stsp  * Copyright (c) 2006 Joris Vink <joris@openbsd.org>
  4 89fd757a 2019-02-07 stsp  * All rights reserved.
  5 89fd757a 2019-02-07 stsp  *
  6 89fd757a 2019-02-07 stsp  * Redistribution and use in source and binary forms, with or without
  7 89fd757a 2019-02-07 stsp  * modification, are permitted provided that the following conditions
  8 89fd757a 2019-02-07 stsp  * are met:
  9 89fd757a 2019-02-07 stsp  *
 10 89fd757a 2019-02-07 stsp  * 1. Redistributions of source code must retain the above copyright
 11 89fd757a 2019-02-07 stsp  *    notice, this list of conditions and the following disclaimer.
 12 89fd757a 2019-02-07 stsp  * 2. The name of the author may not be used to endorse or promote products
 13 89fd757a 2019-02-07 stsp  *    derived from this software without specific prior written permission.
 14 89fd757a 2019-02-07 stsp  *
 15 89fd757a 2019-02-07 stsp  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 16 89fd757a 2019-02-07 stsp  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 17 89fd757a 2019-02-07 stsp  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 18 89fd757a 2019-02-07 stsp  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 19 89fd757a 2019-02-07 stsp  * EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 20 89fd757a 2019-02-07 stsp  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 21 89fd757a 2019-02-07 stsp  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 22 89fd757a 2019-02-07 stsp  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 23 89fd757a 2019-02-07 stsp  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 24 89fd757a 2019-02-07 stsp  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 25 89fd757a 2019-02-07 stsp  */
 26 89fd757a 2019-02-07 stsp 
 27 89fd757a 2019-02-07 stsp #include <sys/queue.h>
 28 89fd757a 2019-02-07 stsp 
 29 89fd757a 2019-02-07 stsp #include <err.h>
 30 89fd757a 2019-02-07 stsp #include <signal.h>
 31 89fd757a 2019-02-07 stsp #include <stdlib.h>
 32 f54c4c24 2019-02-08 stsp #include <stdio.h>
 33 89fd757a 2019-02-07 stsp #include <string.h>
 34 89fd757a 2019-02-07 stsp #include <unistd.h>
 35 89fd757a 2019-02-07 stsp 
 36 89fd757a 2019-02-07 stsp #include "worklist.h"
 37 f54c4c24 2019-02-08 stsp #include "got_error.h"
 38 89fd757a 2019-02-07 stsp 
 39 89fd757a 2019-02-07 stsp /*
 40 89fd757a 2019-02-07 stsp  * adds a path to a worklist.
 41 89fd757a 2019-02-07 stsp  */
 42 f54c4c24 2019-02-08 stsp const struct got_error *
 43 89fd757a 2019-02-07 stsp worklist_add(const char *path, struct wklhead *worklist)
 44 89fd757a 2019-02-07 stsp {
 45 89fd757a 2019-02-07 stsp 	size_t len;
 46 89fd757a 2019-02-07 stsp 	struct worklist *wkl;
 47 89fd757a 2019-02-07 stsp 	sigset_t old, new;
 48 89fd757a 2019-02-07 stsp 
 49 f54c4c24 2019-02-08 stsp 	wkl = calloc(1, sizeof(*wkl));
 50 f54c4c24 2019-02-08 stsp 	if (wkl == NULL)
 51 638f9024 2019-05-13 stsp 		return got_error_from_errno("calloc");
 52 89fd757a 2019-02-07 stsp 
 53 89fd757a 2019-02-07 stsp 	len = strlcpy(wkl->wkl_path, path, sizeof(wkl->wkl_path));
 54 89fd757a 2019-02-07 stsp 	if (len >= sizeof(wkl->wkl_path))
 55 f54c4c24 2019-02-08 stsp 		return got_error(GOT_ERR_NO_SPACE);
 56 89fd757a 2019-02-07 stsp 
 57 89fd757a 2019-02-07 stsp 	sigfillset(&new);
 58 89fd757a 2019-02-07 stsp 	sigprocmask(SIG_BLOCK, &new, &old);
 59 89fd757a 2019-02-07 stsp 	SLIST_INSERT_HEAD(worklist, wkl, wkl_list);
 60 89fd757a 2019-02-07 stsp 	sigprocmask(SIG_SETMASK, &old, NULL);
 61 f54c4c24 2019-02-08 stsp 	return NULL;
 62 89fd757a 2019-02-07 stsp }
 63 89fd757a 2019-02-07 stsp 
 64 89fd757a 2019-02-07 stsp /*
 65 89fd757a 2019-02-07 stsp  * run over the given worklist, calling cb for each element.
 66 89fd757a 2019-02-07 stsp  * this is just like worklist_clean(), except we block signals first.
 67 89fd757a 2019-02-07 stsp  */
 68 89fd757a 2019-02-07 stsp void
 69 89fd757a 2019-02-07 stsp worklist_run(struct wklhead *list, void (*cb)(struct worklist *))
 70 89fd757a 2019-02-07 stsp {
 71 89fd757a 2019-02-07 stsp 	sigset_t old, new;
 72 89fd757a 2019-02-07 stsp 	struct worklist *wkl;
 73 89fd757a 2019-02-07 stsp 
 74 89fd757a 2019-02-07 stsp 	sigfillset(&new);
 75 89fd757a 2019-02-07 stsp 	sigprocmask(SIG_BLOCK, &new, &old);
 76 89fd757a 2019-02-07 stsp 
 77 89fd757a 2019-02-07 stsp 	worklist_clean(list, cb);
 78 89fd757a 2019-02-07 stsp 
 79 89fd757a 2019-02-07 stsp 	while ((wkl = SLIST_FIRST(list)) != NULL) {
 80 89fd757a 2019-02-07 stsp 		SLIST_REMOVE_HEAD(list, wkl_list);
 81 89fd757a 2019-02-07 stsp 		free(wkl);
 82 89fd757a 2019-02-07 stsp 	}
 83 89fd757a 2019-02-07 stsp 
 84 89fd757a 2019-02-07 stsp 	sigprocmask(SIG_SETMASK, &old, NULL);
 85 89fd757a 2019-02-07 stsp }
 86 89fd757a 2019-02-07 stsp 
 87 89fd757a 2019-02-07 stsp /*
 88 89fd757a 2019-02-07 stsp  * pass elements to the specified callback, which has to be signal safe.
 89 89fd757a 2019-02-07 stsp  */
 90 89fd757a 2019-02-07 stsp void
 91 89fd757a 2019-02-07 stsp worklist_clean(struct wklhead *list, void (*cb)(struct worklist *))
 92 89fd757a 2019-02-07 stsp {
 93 89fd757a 2019-02-07 stsp 	struct worklist *wkl;
 94 89fd757a 2019-02-07 stsp 
 95 89fd757a 2019-02-07 stsp 	SLIST_FOREACH(wkl, list, wkl_list)
 96 89fd757a 2019-02-07 stsp 	    cb(wkl);
 97 89fd757a 2019-02-07 stsp }
 98 89fd757a 2019-02-07 stsp 
 99 89fd757a 2019-02-07 stsp void
100 89fd757a 2019-02-07 stsp worklist_unlink(struct worklist *wkl)
101 89fd757a 2019-02-07 stsp {
102 89fd757a 2019-02-07 stsp 	(void)unlink(wkl->wkl_path);
103 89fd757a 2019-02-07 stsp }