eloop.c revision 04949598a23f501be6eec21697465fd46a28840a 
1/*
2 * Event loop based on select() loop
3 * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#include "includes.h"
10
11#include "common.h"
12#include "trace.h"
13#include "list.h"
14#include "eloop.h"
15
16#ifdef CONFIG_ELOOP_POLL
17#include <assert.h>
18#include <poll.h>
19#endif /* CONFIG_ELOOP_POLL */
20
21
22struct eloop_sock {
23	int sock;
24	void *eloop_data;
25	void *user_data;
26	eloop_sock_handler handler;
27	WPA_TRACE_REF(eloop);
28	WPA_TRACE_REF(user);
29	WPA_TRACE_INFO
30};
31
32struct eloop_timeout {
33	struct dl_list list;
34	struct os_time time;
35	void *eloop_data;
36	void *user_data;
37	eloop_timeout_handler handler;
38	WPA_TRACE_REF(eloop);
39	WPA_TRACE_REF(user);
40	WPA_TRACE_INFO
41};
42
43struct eloop_signal {
44	int sig;
45	void *user_data;
46	eloop_signal_handler handler;
47	int signaled;
48};
49
50struct eloop_sock_table {
51	int count;
52	struct eloop_sock *table;
53	int changed;
54};
55
56struct eloop_data {
57	int max_sock;
58
59	int count; /* sum of all table counts */
60#ifdef CONFIG_ELOOP_POLL
61	int max_pollfd_map; /* number of pollfds_map currently allocated */
62	int max_poll_fds; /* number of pollfds currently allocated */
63	struct pollfd *pollfds;
64	struct pollfd **pollfds_map;
65#endif /* CONFIG_ELOOP_POLL */
66	struct eloop_sock_table readers;
67	struct eloop_sock_table writers;
68	struct eloop_sock_table exceptions;
69
70	struct dl_list timeout;
71
72	int signal_count;
73	struct eloop_signal *signals;
74	int signaled;
75	int pending_terminate;
76
77	int terminate;
78	int reader_table_changed;
79};
80
81static struct eloop_data eloop;
82
83
84#ifdef WPA_TRACE
85
86static void eloop_sigsegv_handler(int sig)
87{
88	wpa_trace_show("eloop SIGSEGV");
89	abort();
90}
91
92static void eloop_trace_sock_add_ref(struct eloop_sock_table *table)
93{
94	int i;
95	if (table == NULL || table->table == NULL)
96		return;
97	for (i = 0; i < table->count; i++) {
98		wpa_trace_add_ref(&table->table[i], eloop,
99				  table->table[i].eloop_data);
100		wpa_trace_add_ref(&table->table[i], user,
101				  table->table[i].user_data);
102	}
103}
104
105
106static void eloop_trace_sock_remove_ref(struct eloop_sock_table *table)
107{
108	int i;
109	if (table == NULL || table->table == NULL)
110		return;
111	for (i = 0; i < table->count; i++) {
112		wpa_trace_remove_ref(&table->table[i], eloop,
113				     table->table[i].eloop_data);
114		wpa_trace_remove_ref(&table->table[i], user,
115				     table->table[i].user_data);
116	}
117}
118
119#else /* WPA_TRACE */
120
121#define eloop_trace_sock_add_ref(table) do { } while (0)
122#define eloop_trace_sock_remove_ref(table) do { } while (0)
123
124#endif /* WPA_TRACE */
125
126
127int eloop_init(void)
128{
129	os_memset(&eloop, 0, sizeof(eloop));
130	dl_list_init(&eloop.timeout);
131#ifdef WPA_TRACE
132	signal(SIGSEGV, eloop_sigsegv_handler);
133#endif /* WPA_TRACE */
134	return 0;
135}
136
137
138static int eloop_sock_table_add_sock(struct eloop_sock_table *table,
139                                     int sock, eloop_sock_handler handler,
140                                     void *eloop_data, void *user_data)
141{
142	struct eloop_sock *tmp;
143	int new_max_sock;
144
145	if (sock > eloop.max_sock)
146		new_max_sock = sock;
147	else
148		new_max_sock = eloop.max_sock;
149
150	if (table == NULL)
151		return -1;
152
153#ifdef CONFIG_ELOOP_POLL
154	if (new_max_sock >= eloop.max_pollfd_map) {
155		struct pollfd **nmap;
156		nmap = os_realloc(eloop.pollfds_map, sizeof(struct pollfd *) *
157				  (new_max_sock + 50));
158		if (nmap == NULL)
159			return -1;
160
161		eloop.max_pollfd_map = new_max_sock + 50;
162		eloop.pollfds_map = nmap;
163	}
164
165	if (eloop.count + 1 > eloop.max_poll_fds) {
166		struct pollfd *n;
167		int nmax = eloop.count + 1 + 50;
168		n = os_realloc(eloop.pollfds, sizeof(struct pollfd) * nmax);
169		if (n == NULL)
170			return -1;
171
172		eloop.max_poll_fds = nmax;
173		eloop.pollfds = n;
174	}
175#endif /* CONFIG_ELOOP_POLL */
176
177	eloop_trace_sock_remove_ref(table);
178	tmp = (struct eloop_sock *)
179		os_realloc(table->table,
180			   (table->count + 1) * sizeof(struct eloop_sock));
181	if (tmp == NULL)
182		return -1;
183
184	tmp[table->count].sock = sock;
185	tmp[table->count].eloop_data = eloop_data;
186	tmp[table->count].user_data = user_data;
187	tmp[table->count].handler = handler;
188	wpa_trace_record(&tmp[table->count]);
189	table->count++;
190	table->table = tmp;
191	eloop.max_sock = new_max_sock;
192	eloop.count++;
193	table->changed = 1;
194	eloop_trace_sock_add_ref(table);
195
196	return 0;
197}
198
199
200static void eloop_sock_table_remove_sock(struct eloop_sock_table *table,
201                                         int sock)
202{
203	int i;
204
205	if (table == NULL || table->table == NULL || table->count == 0)
206		return;
207
208	for (i = 0; i < table->count; i++) {
209		if (table->table[i].sock == sock)
210			break;
211	}
212	if (i == table->count)
213		return;
214	eloop_trace_sock_remove_ref(table);
215	if (i != table->count - 1) {
216		os_memmove(&table->table[i], &table->table[i + 1],
217			   (table->count - i - 1) *
218			   sizeof(struct eloop_sock));
219	}
220	table->count--;
221	eloop.count--;
222	table->changed = 1;
223	eloop_trace_sock_add_ref(table);
224}
225
226
227#ifdef CONFIG_ELOOP_POLL
228
229static struct pollfd * find_pollfd(struct pollfd **pollfds_map, int fd, int mx)
230{
231	if (fd < mx && fd >= 0)
232		return pollfds_map[fd];
233	return NULL;
234}
235
236
237static int eloop_sock_table_set_fds(struct eloop_sock_table *readers,
238				    struct eloop_sock_table *writers,
239				    struct eloop_sock_table *exceptions,
240				    struct pollfd *pollfds,
241				    struct pollfd **pollfds_map,
242				    int max_pollfd_map)
243{
244	int i;
245	int nxt = 0;
246	int fd;
247	struct pollfd *pfd;
248
249	/* Clear pollfd lookup map. It will be re-populated below. */
250	os_memset(pollfds_map, 0, sizeof(struct pollfd *) * max_pollfd_map);
251
252	if (readers && readers->table) {
253		for (i = 0; i < readers->count; i++) {
254			fd = readers->table[i].sock;
255			assert(fd >= 0 && fd < max_pollfd_map);
256			pollfds[nxt].fd = fd;
257			pollfds[nxt].events = POLLIN;
258			pollfds[nxt].revents = 0;
259			pollfds_map[fd] = &(pollfds[nxt]);
260			nxt++;
261		}
262	}
263
264	if (writers && writers->table) {
265		for (i = 0; i < writers->count; i++) {
266			/*
267			 * See if we already added this descriptor, update it
268			 * if so.
269			 */
270			fd = writers->table[i].sock;
271			assert(fd >= 0 && fd < max_pollfd_map);
272			pfd = pollfds_map[fd];
273			if (!pfd) {
274				pfd = &(pollfds[nxt]);
275				pfd->events = 0;
276				pfd->fd = fd;
277				pollfds[i].revents = 0;
278				pollfds_map[fd] = pfd;
279				nxt++;
280			}
281			pfd->events |= POLLOUT;
282		}
283	}
284
285	/*
286	 * Exceptions are always checked when using poll, but I suppose it's
287	 * possible that someone registered a socket *only* for exception
288	 * handling. Set the POLLIN bit in this case.
289	 */
290	if (exceptions && exceptions->table) {
291		for (i = 0; i < exceptions->count; i++) {
292			/*
293			 * See if we already added this descriptor, just use it
294			 * if so.
295			 */
296			fd = exceptions->table[i].sock;
297			assert(fd >= 0 && fd < max_pollfd_map);
298			pfd = pollfds_map[fd];
299			if (!pfd) {
300				pfd = &(pollfds[nxt]);
301				pfd->events = POLLIN;
302				pfd->fd = fd;
303				pollfds[i].revents = 0;
304				pollfds_map[fd] = pfd;
305				nxt++;
306			}
307		}
308	}
309
310	return nxt;
311}
312
313
314static int eloop_sock_table_dispatch_table(struct eloop_sock_table *table,
315					   struct pollfd **pollfds_map,
316					   int max_pollfd_map,
317					   short int revents)
318{
319	int i;
320	struct pollfd *pfd;
321
322	if (!table || !table->table)
323		return 0;
324
325	table->changed = 0;
326	for (i = 0; i < table->count; i++) {
327		pfd = find_pollfd(pollfds_map, table->table[i].sock,
328				  max_pollfd_map);
329		if (!pfd)
330			continue;
331
332		if (!(pfd->revents & revents))
333			continue;
334
335		table->table[i].handler(table->table[i].sock,
336					table->table[i].eloop_data,
337					table->table[i].user_data);
338		if (table->changed)
339			return 1;
340	}
341
342	return 0;
343}
344
345
346static void eloop_sock_table_dispatch(struct eloop_sock_table *readers,
347				      struct eloop_sock_table *writers,
348				      struct eloop_sock_table *exceptions,
349				      struct pollfd **pollfds_map,
350				      int max_pollfd_map)
351{
352	if (eloop_sock_table_dispatch_table(readers, pollfds_map,
353					    max_pollfd_map, POLLIN | POLLERR |
354					    POLLHUP))
355		return; /* pollfds may be invalid at this point */
356
357	if (eloop_sock_table_dispatch_table(writers, pollfds_map,
358					    max_pollfd_map, POLLOUT))
359		return; /* pollfds may be invalid at this point */
360
361	eloop_sock_table_dispatch_table(exceptions, pollfds_map,
362					max_pollfd_map, POLLERR | POLLHUP);
363}
364
365#else /* CONFIG_ELOOP_POLL */
366
367static void eloop_sock_table_set_fds(struct eloop_sock_table *table,
368				     fd_set *fds)
369{
370	int i;
371
372	FD_ZERO(fds);
373
374	if (table->table == NULL)
375		return;
376
377	for (i = 0; i < table->count; i++)
378		FD_SET(table->table[i].sock, fds);
379}
380
381
382static void eloop_sock_table_dispatch(struct eloop_sock_table *table,
383				      fd_set *fds)
384{
385	int i;
386
387	if (table == NULL || table->table == NULL)
388		return;
389
390	table->changed = 0;
391	for (i = 0; i < table->count; i++) {
392		if (FD_ISSET(table->table[i].sock, fds)) {
393			table->table[i].handler(table->table[i].sock,
394						table->table[i].eloop_data,
395						table->table[i].user_data);
396			if (table->changed)
397				break;
398		}
399	}
400}
401
402#endif /* CONFIG_ELOOP_POLL */
403
404
405static void eloop_sock_table_destroy(struct eloop_sock_table *table)
406{
407	if (table) {
408		int i;
409		for (i = 0; i < table->count && table->table; i++) {
410			wpa_printf(MSG_INFO, "ELOOP: remaining socket: "
411				   "sock=%d eloop_data=%p user_data=%p "
412				   "handler=%p",
413				   table->table[i].sock,
414				   table->table[i].eloop_data,
415				   table->table[i].user_data,
416				   table->table[i].handler);
417			wpa_trace_dump_funcname("eloop unregistered socket "
418						"handler",
419						table->table[i].handler);
420			wpa_trace_dump("eloop sock", &table->table[i]);
421		}
422		os_free(table->table);
423	}
424}
425
426
427int eloop_register_read_sock(int sock, eloop_sock_handler handler,
428			     void *eloop_data, void *user_data)
429{
430	return eloop_register_sock(sock, EVENT_TYPE_READ, handler,
431				   eloop_data, user_data);
432}
433
434
435void eloop_unregister_read_sock(int sock)
436{
437	eloop_unregister_sock(sock, EVENT_TYPE_READ);
438}
439
440
441static struct eloop_sock_table *eloop_get_sock_table(eloop_event_type type)
442{
443	switch (type) {
444	case EVENT_TYPE_READ:
445		return &eloop.readers;
446	case EVENT_TYPE_WRITE:
447		return &eloop.writers;
448	case EVENT_TYPE_EXCEPTION:
449		return &eloop.exceptions;
450	}
451
452	return NULL;
453}
454
455
456int eloop_register_sock(int sock, eloop_event_type type,
457			eloop_sock_handler handler,
458			void *eloop_data, void *user_data)
459{
460	struct eloop_sock_table *table;
461
462	table = eloop_get_sock_table(type);
463	return eloop_sock_table_add_sock(table, sock, handler,
464					 eloop_data, user_data);
465}
466
467
468void eloop_unregister_sock(int sock, eloop_event_type type)
469{
470	struct eloop_sock_table *table;
471
472	table = eloop_get_sock_table(type);
473	eloop_sock_table_remove_sock(table, sock);
474}
475
476
477int eloop_register_timeout(unsigned int secs, unsigned int usecs,
478			   eloop_timeout_handler handler,
479			   void *eloop_data, void *user_data)
480{
481	struct eloop_timeout *timeout, *tmp;
482	os_time_t now_sec;
483
484	timeout = os_zalloc(sizeof(*timeout));
485	if (timeout == NULL)
486		return -1;
487	if (os_get_time(&timeout->time) < 0) {
488		os_free(timeout);
489		return -1;
490	}
491	now_sec = timeout->time.sec;
492	timeout->time.sec += secs;
493	if (timeout->time.sec < now_sec) {
494		/*
495		 * Integer overflow - assume long enough timeout to be assumed
496		 * to be infinite, i.e., the timeout would never happen.
497		 */
498		wpa_printf(MSG_DEBUG, "ELOOP: Too long timeout (secs=%u) to "
499			   "ever happen - ignore it", secs);
500		os_free(timeout);
501		return 0;
502	}
503	timeout->time.usec += usecs;
504	while (timeout->time.usec >= 1000000) {
505		timeout->time.sec++;
506		timeout->time.usec -= 1000000;
507	}
508	timeout->eloop_data = eloop_data;
509	timeout->user_data = user_data;
510	timeout->handler = handler;
511	wpa_trace_add_ref(timeout, eloop, eloop_data);
512	wpa_trace_add_ref(timeout, user, user_data);
513	wpa_trace_record(timeout);
514
515	/* Maintain timeouts in order of increasing time */
516	dl_list_for_each(tmp, &eloop.timeout, struct eloop_timeout, list) {
517		if (os_time_before(&timeout->time, &tmp->time)) {
518			dl_list_add(tmp->list.prev, &timeout->list);
519			return 0;
520		}
521	}
522	dl_list_add_tail(&eloop.timeout, &timeout->list);
523
524	return 0;
525}
526
527
528static void eloop_remove_timeout(struct eloop_timeout *timeout)
529{
530	dl_list_del(&timeout->list);
531	wpa_trace_remove_ref(timeout, eloop, timeout->eloop_data);
532	wpa_trace_remove_ref(timeout, user, timeout->user_data);
533	os_free(timeout);
534}
535
536
537int eloop_cancel_timeout(eloop_timeout_handler handler,
538			 void *eloop_data, void *user_data)
539{
540	struct eloop_timeout *timeout, *prev;
541	int removed = 0;
542
543	dl_list_for_each_safe(timeout, prev, &eloop.timeout,
544			      struct eloop_timeout, list) {
545		if (timeout->handler == handler &&
546		    (timeout->eloop_data == eloop_data ||
547		     eloop_data == ELOOP_ALL_CTX) &&
548		    (timeout->user_data == user_data ||
549		     user_data == ELOOP_ALL_CTX)) {
550			eloop_remove_timeout(timeout);
551			removed++;
552		}
553	}
554
555	return removed;
556}
557
558
559int eloop_is_timeout_registered(eloop_timeout_handler handler,
560				void *eloop_data, void *user_data)
561{
562	struct eloop_timeout *tmp;
563
564	dl_list_for_each(tmp, &eloop.timeout, struct eloop_timeout, list) {
565		if (tmp->handler == handler &&
566		    tmp->eloop_data == eloop_data &&
567		    tmp->user_data == user_data)
568			return 1;
569	}
570
571	return 0;
572}
573
574
575#ifndef CONFIG_NATIVE_WINDOWS
576static void eloop_handle_alarm(int sig)
577{
578	wpa_printf(MSG_ERROR, "eloop: could not process SIGINT or SIGTERM in "
579		   "two seconds. Looks like there\n"
580		   "is a bug that ends up in a busy loop that "
581		   "prevents clean shutdown.\n"
582		   "Killing program forcefully.\n");
583	exit(1);
584}
585#endif /* CONFIG_NATIVE_WINDOWS */
586
587
588static void eloop_handle_signal(int sig)
589{
590	int i;
591
592#ifndef CONFIG_NATIVE_WINDOWS
593	if ((sig == SIGINT || sig == SIGTERM) && !eloop.pending_terminate) {
594		/* Use SIGALRM to break out from potential busy loops that
595		 * would not allow the program to be killed. */
596		eloop.pending_terminate = 1;
597		signal(SIGALRM, eloop_handle_alarm);
598		alarm(2);
599	}
600#endif /* CONFIG_NATIVE_WINDOWS */
601
602	eloop.signaled++;
603	for (i = 0; i < eloop.signal_count; i++) {
604		if (eloop.signals[i].sig == sig) {
605			eloop.signals[i].signaled++;
606			break;
607		}
608	}
609}
610
611
612static void eloop_process_pending_signals(void)
613{
614	int i;
615
616	if (eloop.signaled == 0)
617		return;
618	eloop.signaled = 0;
619
620	if (eloop.pending_terminate) {
621#ifndef CONFIG_NATIVE_WINDOWS
622		alarm(0);
623#endif /* CONFIG_NATIVE_WINDOWS */
624		eloop.pending_terminate = 0;
625	}
626
627	for (i = 0; i < eloop.signal_count; i++) {
628		if (eloop.signals[i].signaled) {
629			eloop.signals[i].signaled = 0;
630			eloop.signals[i].handler(eloop.signals[i].sig,
631						 eloop.signals[i].user_data);
632		}
633	}
634}
635
636
637int eloop_register_signal(int sig, eloop_signal_handler handler,
638			  void *user_data)
639{
640	struct eloop_signal *tmp;
641
642	tmp = (struct eloop_signal *)
643		os_realloc(eloop.signals,
644			   (eloop.signal_count + 1) *
645			   sizeof(struct eloop_signal));
646	if (tmp == NULL)
647		return -1;
648
649	tmp[eloop.signal_count].sig = sig;
650	tmp[eloop.signal_count].user_data = user_data;
651	tmp[eloop.signal_count].handler = handler;
652	tmp[eloop.signal_count].signaled = 0;
653	eloop.signal_count++;
654	eloop.signals = tmp;
655	signal(sig, eloop_handle_signal);
656
657	return 0;
658}
659
660
661int eloop_register_signal_terminate(eloop_signal_handler handler,
662				    void *user_data)
663{
664	int ret = eloop_register_signal(SIGINT, handler, user_data);
665	if (ret == 0)
666		ret = eloop_register_signal(SIGTERM, handler, user_data);
667	return ret;
668}
669
670
671int eloop_register_signal_reconfig(eloop_signal_handler handler,
672				   void *user_data)
673{
674#ifdef CONFIG_NATIVE_WINDOWS
675	return 0;
676#else /* CONFIG_NATIVE_WINDOWS */
677	return eloop_register_signal(SIGHUP, handler, user_data);
678#endif /* CONFIG_NATIVE_WINDOWS */
679}
680
681
682void eloop_run(void)
683{
684#ifdef CONFIG_ELOOP_POLL
685	int num_poll_fds;
686	int timeout_ms = 0;
687#else /* CONFIG_ELOOP_POLL */
688	fd_set *rfds, *wfds, *efds;
689	struct timeval _tv;
690#endif /* CONFIG_ELOOP_POLL */
691	int res;
692	struct os_time tv, now;
693
694#ifndef CONFIG_ELOOP_POLL
695	rfds = os_malloc(sizeof(*rfds));
696	wfds = os_malloc(sizeof(*wfds));
697	efds = os_malloc(sizeof(*efds));
698	if (rfds == NULL || wfds == NULL || efds == NULL)
699		goto out;
700#endif /* CONFIG_ELOOP_POLL */
701
702	while (!eloop.terminate &&
703	       (!dl_list_empty(&eloop.timeout) || eloop.readers.count > 0 ||
704		eloop.writers.count > 0 || eloop.exceptions.count > 0)) {
705		struct eloop_timeout *timeout;
706		timeout = dl_list_first(&eloop.timeout, struct eloop_timeout,
707					list);
708		if (timeout) {
709			os_get_time(&now);
710			if (os_time_before(&now, &timeout->time))
711				os_time_sub(&timeout->time, &now, &tv);
712			else
713				tv.sec = tv.usec = 0;
714#ifdef CONFIG_ELOOP_POLL
715			timeout_ms = tv.sec * 1000 + tv.usec / 1000;
716#else /* CONFIG_ELOOP_POLL */
717			_tv.tv_sec = tv.sec;
718			_tv.tv_usec = tv.usec;
719#endif /* CONFIG_ELOOP_POLL */
720		}
721
722#ifdef CONFIG_ELOOP_POLL
723		num_poll_fds = eloop_sock_table_set_fds(
724			&eloop.readers, &eloop.writers, &eloop.exceptions,
725			eloop.pollfds, eloop.pollfds_map,
726			eloop.max_pollfd_map);
727		res = poll(eloop.pollfds, num_poll_fds,
728			   timeout ? timeout_ms : -1);
729
730		if (res < 0 && errno != EINTR && errno != 0) {
731			perror("poll");
732			goto out;
733		}
734#else /* CONFIG_ELOOP_POLL */
735		eloop_sock_table_set_fds(&eloop.readers, rfds);
736		eloop_sock_table_set_fds(&eloop.writers, wfds);
737		eloop_sock_table_set_fds(&eloop.exceptions, efds);
738		res = select(eloop.max_sock + 1, rfds, wfds, efds,
739			     timeout ? &_tv : NULL);
740		if (res < 0 && errno != EINTR && errno != 0) {
741			perror("select");
742			goto out;
743		}
744#endif /* CONFIG_ELOOP_POLL */
745		eloop_process_pending_signals();
746
747		/* check if some registered timeouts have occurred */
748		timeout = dl_list_first(&eloop.timeout, struct eloop_timeout,
749					list);
750		if (timeout) {
751			os_get_time(&now);
752			if (!os_time_before(&now, &timeout->time)) {
753				void *eloop_data = timeout->eloop_data;
754				void *user_data = timeout->user_data;
755				eloop_timeout_handler handler =
756					timeout->handler;
757				eloop_remove_timeout(timeout);
758				handler(eloop_data, user_data);
759			}
760
761		}
762
763		if (res <= 0)
764			continue;
765
766#ifdef CONFIG_ELOOP_POLL
767		eloop_sock_table_dispatch(&eloop.readers, &eloop.writers,
768					  &eloop.exceptions, eloop.pollfds_map,
769					  eloop.max_pollfd_map);
770#else /* CONFIG_ELOOP_POLL */
771		eloop_sock_table_dispatch(&eloop.readers, rfds);
772		eloop_sock_table_dispatch(&eloop.writers, wfds);
773		eloop_sock_table_dispatch(&eloop.exceptions, efds);
774#endif /* CONFIG_ELOOP_POLL */
775	}
776
777out:
778#ifndef CONFIG_ELOOP_POLL
779	os_free(rfds);
780	os_free(wfds);
781	os_free(efds);
782#endif /* CONFIG_ELOOP_POLL */
783	return;
784}
785
786
787void eloop_terminate(void)
788{
789	eloop.terminate = 1;
790}
791
792
793void eloop_destroy(void)
794{
795	struct eloop_timeout *timeout, *prev;
796	struct os_time now;
797
798	os_get_time(&now);
799	dl_list_for_each_safe(timeout, prev, &eloop.timeout,
800			      struct eloop_timeout, list) {
801		int sec, usec;
802		sec = timeout->time.sec - now.sec;
803		usec = timeout->time.usec - now.usec;
804		if (timeout->time.usec < now.usec) {
805			sec--;
806			usec += 1000000;
807		}
808		wpa_printf(MSG_INFO, "ELOOP: remaining timeout: %d.%06d "
809			   "eloop_data=%p user_data=%p handler=%p",
810			   sec, usec, timeout->eloop_data, timeout->user_data,
811			   timeout->handler);
812		wpa_trace_dump_funcname("eloop unregistered timeout handler",
813					timeout->handler);
814		wpa_trace_dump("eloop timeout", timeout);
815		eloop_remove_timeout(timeout);
816	}
817	eloop_sock_table_destroy(&eloop.readers);
818	eloop_sock_table_destroy(&eloop.writers);
819	eloop_sock_table_destroy(&eloop.exceptions);
820	os_free(eloop.signals);
821
822#ifdef CONFIG_ELOOP_POLL
823	os_free(eloop.pollfds);
824	os_free(eloop.pollfds_map);
825#endif /* CONFIG_ELOOP_POLL */
826}
827
828
829int eloop_terminated(void)
830{
831	return eloop.terminate;
832}
833
834
835void eloop_wait_for_read_sock(int sock)
836{
837#ifdef CONFIG_ELOOP_POLL
838	struct pollfd pfd;
839
840	if (sock < 0)
841		return;
842
843	os_memset(&pfd, 0, sizeof(pfd));
844	pfd.fd = sock;
845	pfd.events = POLLIN;
846
847	poll(&pfd, 1, -1);
848#else /* CONFIG_ELOOP_POLL */
849	fd_set rfds;
850
851	if (sock < 0)
852		return;
853
854	FD_ZERO(&rfds);
855	FD_SET(sock, &rfds);
856	select(sock + 1, &rfds, NULL, NULL, NULL);
857#endif /* CONFIG_ELOOP_POLL */
858}
859