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