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