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