2 * Event loop based on select() loop
3 * Copyright (c) 2002-2005, Jouni Malinen <jkmaline@cc.hut.fi>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
19 #include <sys/types.h>
24 #ifdef CONFIG_NATIVE_WINDOWS
26 #endif /* CONFIG_NATIVE_WINDOWS */
35 void (*handler)(int sock, void *eloop_ctx, void *sock_ctx);
38 struct eloop_timeout {
42 void (*handler)(void *eloop_ctx, void *sock_ctx);
43 struct eloop_timeout *next;
49 void (*handler)(int sig, void *eloop_ctx, void *signal_ctx);
56 int max_sock, reader_count;
57 struct eloop_sock *readers;
59 struct eloop_timeout *timeout;
62 struct eloop_signal *signals;
64 int pending_terminate;
67 int reader_table_changed;
70 static struct eloop_data eloop;
73 void eloop_init(void *user_data)
75 memset(&eloop, 0, sizeof(eloop));
76 eloop.user_data = user_data;
80 int eloop_register_read_sock(int sock,
81 void (*handler)(int sock, void *eloop_ctx,
83 void *eloop_data, void *user_data)
85 struct eloop_sock *tmp;
87 tmp = (struct eloop_sock *)
88 realloc(eloop.readers,
89 (eloop.reader_count + 1) * sizeof(struct eloop_sock));
93 tmp[eloop.reader_count].sock = sock;
94 tmp[eloop.reader_count].eloop_data = eloop_data;
95 tmp[eloop.reader_count].user_data = user_data;
96 tmp[eloop.reader_count].handler = handler;
99 if (sock > eloop.max_sock)
100 eloop.max_sock = sock;
101 eloop.reader_table_changed = 1;
107 void eloop_unregister_read_sock(int sock)
111 if (eloop.readers == NULL || eloop.reader_count == 0)
114 for (i = 0; i < eloop.reader_count; i++) {
115 if (eloop.readers[i].sock == sock)
118 if (i == eloop.reader_count)
120 if (i != eloop.reader_count - 1) {
121 memmove(&eloop.readers[i], &eloop.readers[i + 1],
122 (eloop.reader_count - i - 1) *
123 sizeof(struct eloop_sock));
125 eloop.reader_count--;
126 eloop.reader_table_changed = 1;
130 int eloop_register_timeout(unsigned int secs, unsigned int usecs,
131 void (*handler)(void *eloop_ctx, void *timeout_ctx),
132 void *eloop_data, void *user_data)
134 struct eloop_timeout *timeout, *tmp, *prev;
136 timeout = (struct eloop_timeout *) malloc(sizeof(*timeout));
139 gettimeofday(&timeout->time, NULL);
140 timeout->time.tv_sec += secs;
141 timeout->time.tv_usec += usecs;
142 while (timeout->time.tv_usec >= 1000000) {
143 timeout->time.tv_sec++;
144 timeout->time.tv_usec -= 1000000;
146 timeout->eloop_data = eloop_data;
147 timeout->user_data = user_data;
148 timeout->handler = handler;
149 timeout->next = NULL;
151 if (eloop.timeout == NULL) {
152 eloop.timeout = timeout;
158 while (tmp != NULL) {
159 if (timercmp(&timeout->time, &tmp->time, <))
166 timeout->next = eloop.timeout;
167 eloop.timeout = timeout;
169 timeout->next = prev->next;
170 prev->next = timeout;
177 int eloop_cancel_timeout(void (*handler)(void *eloop_ctx, void *sock_ctx),
178 void *eloop_data, void *user_data)
180 struct eloop_timeout *timeout, *prev, *next;
184 timeout = eloop.timeout;
185 while (timeout != NULL) {
186 next = timeout->next;
188 if (timeout->handler == handler &&
189 (timeout->eloop_data == eloop_data ||
190 eloop_data == ELOOP_ALL_CTX) &&
191 (timeout->user_data == user_data ||
192 user_data == ELOOP_ALL_CTX)) {
194 eloop.timeout = next;
209 #ifndef CONFIG_NATIVE_WINDOWS
210 static void eloop_handle_alarm(int sig)
212 fprintf(stderr, "eloop: could not process SIGINT or SIGTERM in two "
213 "seconds. Looks like there\n"
214 "is a bug that ends up in a busy loop that "
215 "prevents clean shutdown.\n"
216 "Killing program forcefully.\n");
219 #endif /* CONFIG_NATIVE_WINDOWS */
222 static void eloop_handle_signal(int sig)
226 #ifndef CONFIG_NATIVE_WINDOWS
227 if ((sig == SIGINT || sig == SIGTERM) && !eloop.pending_terminate) {
228 /* Use SIGALRM to break out from potential busy loops that
229 * would not allow the program to be killed. */
230 eloop.pending_terminate = 1;
231 signal(SIGALRM, eloop_handle_alarm);
234 #endif /* CONFIG_NATIVE_WINDOWS */
237 for (i = 0; i < eloop.signal_count; i++) {
238 if (eloop.signals[i].sig == sig) {
239 eloop.signals[i].signaled++;
246 static void eloop_process_pending_signals(void)
250 if (eloop.signaled == 0)
254 if (eloop.pending_terminate) {
255 #ifndef CONFIG_NATIVE_WINDOWS
257 #endif /* CONFIG_NATIVE_WINDOWS */
258 eloop.pending_terminate = 0;
261 for (i = 0; i < eloop.signal_count; i++) {
262 if (eloop.signals[i].signaled) {
263 eloop.signals[i].signaled = 0;
264 eloop.signals[i].handler(eloop.signals[i].sig,
266 eloop.signals[i].user_data);
272 int eloop_register_signal(int sig,
273 void (*handler)(int sig, void *eloop_ctx,
277 struct eloop_signal *tmp;
279 tmp = (struct eloop_signal *)
280 realloc(eloop.signals,
281 (eloop.signal_count + 1) *
282 sizeof(struct eloop_signal));
286 tmp[eloop.signal_count].sig = sig;
287 tmp[eloop.signal_count].user_data = user_data;
288 tmp[eloop.signal_count].handler = handler;
289 tmp[eloop.signal_count].signaled = 0;
290 eloop.signal_count++;
292 signal(sig, eloop_handle_signal);
302 struct timeval tv, now;
304 rfds = malloc(sizeof(*rfds));
306 printf("eloop_run - malloc failed\n");
310 while (!eloop.terminate &&
311 (eloop.timeout || eloop.reader_count > 0)) {
313 gettimeofday(&now, NULL);
314 if (timercmp(&now, &eloop.timeout->time, <))
315 timersub(&eloop.timeout->time, &now, &tv);
317 tv.tv_sec = tv.tv_usec = 0;
319 printf("next timeout in %lu.%06lu sec\n",
320 tv.tv_sec, tv.tv_usec);
325 for (i = 0; i < eloop.reader_count; i++)
326 FD_SET(eloop.readers[i].sock, rfds);
327 res = select(eloop.max_sock + 1, rfds, NULL, NULL,
328 eloop.timeout ? &tv : NULL);
329 if (res < 0 && errno != EINTR) {
334 eloop_process_pending_signals();
336 /* check if some registered timeouts have occurred */
338 struct eloop_timeout *tmp;
340 gettimeofday(&now, NULL);
341 if (!timercmp(&now, &eloop.timeout->time, <)) {
343 eloop.timeout = eloop.timeout->next;
344 tmp->handler(tmp->eloop_data,
354 eloop.reader_table_changed = 0;
355 for (i = 0; i < eloop.reader_count; i++) {
356 if (FD_ISSET(eloop.readers[i].sock, rfds)) {
357 eloop.readers[i].handler(
358 eloop.readers[i].sock,
359 eloop.readers[i].eloop_data,
360 eloop.readers[i].user_data);
361 if (eloop.reader_table_changed)
371 void eloop_terminate(void)
377 void eloop_destroy(void)
379 struct eloop_timeout *timeout, *prev;
381 timeout = eloop.timeout;
382 while (timeout != NULL) {
384 timeout = timeout->next;
392 int eloop_terminated(void)
394 return eloop.terminate;