1 /* $NetBSD: event.c,v 1.2 2024/08/18 20:47:14 christos Exp $ */ 2 3 /* 4 * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC") 5 * Copyright (C) 1998-2001 Internet Software Consortium. 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 13 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 17 * PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 /* Id: event.c,v 1.21 2007/06/19 23:47:17 tbox Exp */ 21 22 /*! 23 * \file 24 * \author Principal Author: Bob Halley 25 */ 26 27 #include <config.h> 28 29 #include <isc/event.h> 30 #include <isc/mem.h> 31 #include <isc/util.h> 32 33 /*** 34 *** Events. 35 ***/ 36 37 static void 38 destroy(isc_event_t *event) { 39 isc_mem_put(event->ev_destroy_arg, event, event->ev_size); 40 } 41 42 isc_event_t * 43 isc_event_allocate(isc_mem_t *mctx, void *sender, isc_eventtype_t type, 44 isc_taskaction_t action, const void *arg, size_t size) 45 { 46 isc_event_t *event; 47 void *deconst_arg; 48 49 REQUIRE(size >= sizeof(struct isc_event)); 50 REQUIRE(action != NULL); 51 52 event = isc_mem_get(mctx, size); 53 if (event == NULL) 54 return (NULL); 55 56 /* 57 * Removing the const attribute from "arg" is the best of two 58 * evils here. If the event->ev_arg member is made const, then 59 * it affects a great many users of the task/event subsystem 60 * which are not passing in an "arg" which starts its life as 61 * const. Changing isc_event_allocate() and isc_task_onshutdown() 62 * to not have "arg" prototyped as const (which is quite legitimate, 63 * because neither of those functions modify arg) can cause 64 * compiler whining anytime someone does want to use a const 65 * arg that they themselves never modify, such as with 66 * gcc -Wwrite-strings and using a string "arg". 67 */ 68 DE_CONST(arg, deconst_arg); 69 70 ISC_EVENT_INIT(event, size, 0, NULL, type, action, deconst_arg, 71 sender, destroy, mctx); 72 73 return (event); 74 } 75 76 void 77 isc_event_free(isc_event_t **eventp) { 78 isc_event_t *event; 79 80 REQUIRE(eventp != NULL); 81 event = *eventp; 82 REQUIRE(event != NULL); 83 84 if (event->ev_destroy != NULL) 85 (event->ev_destroy)(event); 86 87 *eventp = NULL; 88 } 89