1 /*	$OpenBSD$	*/
2 /*
3  * Copyright (c) 2012 Eric Faurot <eric@openbsd.org>
4  *
5  * Permission to use, copy, modify, and 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 THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include "openbsd-compat.h"
19 
20 #include <sys/types.h>
21 #include <sys/socket.h>
22 #include <netdb.h>
23 
24 #include <asr.h>
25 #include <event.h>
26 #include <stdlib.h>
27 
28 struct event_asr {
29 	struct event	 ev;
30 	struct asr_query *async;
31 	void		(*cb)(struct asr_result *, void *);
32 	void		*arg;
33 };
34 
35 struct event_asr * event_asr_run(struct asr_query *,
36     void (*)(struct asr_result *, void *), void *);
37 void event_asr_abort(struct event_asr *);
38 
39 static void
40 event_asr_dispatch(int fd __attribute__((__unused__)),
41     short ev __attribute__((__unused__)), void *arg)
42 {
43 	struct event_asr	*eva = arg;
44 	struct asr_result	 ar;
45 	struct timeval		 tv;
46 
47 	event_del(&eva->ev);
48 
49 	if (asr_run(eva->async, &ar)) {
50 		eva->cb(&ar, eva->arg);
51 		free(eva);
52 	} else {
53 		event_set(&eva->ev, ar.ar_fd,
54 		    ar.ar_cond == ASR_WANT_READ ? EV_READ : EV_WRITE,
55 		    event_asr_dispatch, eva);
56 		tv.tv_sec = ar.ar_timeout / 1000;
57 		tv.tv_usec = (ar.ar_timeout % 1000) * 1000;
58 		event_add(&eva->ev, &tv);
59 	}
60 }
61 
62 struct event_asr *
63 event_asr_run(struct asr_query *async, void (*cb)(struct asr_result *, void *),
64     void *arg)
65 {
66 	struct event_asr *eva;
67 	struct timeval tv;
68 
69 	eva = calloc(1, sizeof *eva);
70 	if (eva == NULL)
71 		return (NULL);
72 	eva->async = async;
73 	eva->cb = cb;
74 	eva->arg = arg;
75 	tv.tv_sec = 0;
76 	tv.tv_usec = 0;
77 	evtimer_set(&eva->ev, event_asr_dispatch, eva);
78 	evtimer_add(&eva->ev, &tv);
79 	return (eva);
80 }
81 
82 void
83 event_asr_abort(struct event_asr *eva)
84 {
85 	asr_abort(eva->async);
86 	event_del(&eva->ev);
87 	free(eva);
88 }