contrib/hostapd/src/utils/eloop_none.c

   1 /*
   2  * Event loop - empty template (basic structure, but no OS specific operations)
   3  * Copyright (c) 2002-2005, Jouni Malinen <j@w1.fi>
   4  *
   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.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "eloop.h"
  19
  20
  21 struct eloop_sock {
  22         int sock;
  23         void *eloop_data;
  24         void *user_data;
  25         void (*handler)(int sock, void *eloop_ctx, void *sock_ctx);
  26 };
  27
  28 struct eloop_timeout {
  29         struct os_time time;
  30         void *eloop_data;
  31         void *user_data;
  32         void (*handler)(void *eloop_ctx, void *sock_ctx);
  33         struct eloop_timeout *next;
  34 };
  35
  36 struct eloop_signal {
  37         int sig;
  38         void *user_data;
  39         void (*handler)(int sig, void *eloop_ctx, void *signal_ctx);
  40         int signaled;
  41 };
  42
  43 struct eloop_data {
  44         void *user_data;
  45
  46         int max_sock, reader_count;
  47         struct eloop_sock *readers;
  48
  49         struct eloop_timeout *timeout;
  50
  51         int signal_count;
  52         struct eloop_signal *signals;
  53         int signaled;
  54         int pending_terminate;
  55
  56         int terminate;
  57         int reader_table_changed;
  58 };
  59
  60 static struct eloop_data eloop;
  61
  62
  63 int eloop_init(void *user_data)
  64 {
  65         memset(&eloop, 0, sizeof(eloop));
  66         eloop.user_data = user_data;
  67         return 0;
  68 }
  69
  70
  71 int eloop_register_read_sock(int sock,
  72                              void (*handler)(int sock, void *eloop_ctx,
  73                                              void *sock_ctx),
  74                              void *eloop_data, void *user_data)
  75 {
  76         struct eloop_sock *tmp;
  77
  78         tmp = (struct eloop_sock *)
  79                 realloc(eloop.readers,
  80                         (eloop.reader_count + 1) * sizeof(struct eloop_sock));
  81         if (tmp == NULL)
  82                 return -1;
  83
  84         tmp[eloop.reader_count].sock = sock;
  85         tmp[eloop.reader_count].eloop_data = eloop_data;
  86         tmp[eloop.reader_count].user_data = user_data;
  87         tmp[eloop.reader_count].handler = handler;
  88         eloop.reader_count++;
  89         eloop.readers = tmp;
  90         if (sock > eloop.max_sock)
  91                 eloop.max_sock = sock;
  92         eloop.reader_table_changed = 1;
  93
  94         return 0;
  95 }
  96
  97
  98 void eloop_unregister_read_sock(int sock)
  99 {
 100         int i;
 101
 102         if (eloop.readers == NULL || eloop.reader_count == 0)
 103                 return;
 104
 105         for (i = 0; i < eloop.reader_count; i++) {
 106                 if (eloop.readers[i].sock == sock)
 107                         break;
 108         }
 109         if (i == eloop.reader_count)
 110                 return;
 111         if (i != eloop.reader_count - 1) {
 112                 memmove(&eloop.readers[i], &eloop.readers[i + 1],
 113                         (eloop.reader_count - i - 1) *
 114                         sizeof(struct eloop_sock));
 115         }
 116         eloop.reader_count--;
 117         eloop.reader_table_changed = 1;
 118 }
 119
 120
 121 int eloop_register_timeout(unsigned int secs, unsigned int usecs,
 122                            void (*handler)(void *eloop_ctx, void *timeout_ctx),
 123                            void *eloop_data, void *user_data)
 124 {
 125         struct eloop_timeout *timeout, *tmp, *prev;
 126
 127         timeout = (struct eloop_timeout *) malloc(sizeof(*timeout));
 128         if (timeout == NULL)
 129                 return -1;
 130         os_get_time(&timeout->time);
 131         timeout->time.sec += secs;
 132         timeout->time.usec += usecs;
 133         while (timeout->time.usec >= 1000000) {
 134                 timeout->time.sec++;
 135                 timeout->time.usec -= 1000000;
 136         }
 137         timeout->eloop_data = eloop_data;
 138         timeout->user_data = user_data;
 139         timeout->handler = handler;
 140         timeout->next = NULL;
 141
 142         if (eloop.timeout == NULL) {
 143                 eloop.timeout = timeout;
 144                 return 0;
 145         }
 146
 147         prev = NULL;
 148         tmp = eloop.timeout;
 149         while (tmp != NULL) {
 150                 if (os_time_before(&timeout->time, &tmp->time))
 151                         break;
 152                 prev = tmp;
 153                 tmp = tmp->next;
 154         }
 155
 156         if (prev == NULL) {
 157                 timeout->next = eloop.timeout;
 158                 eloop.timeout = timeout;
 159         } else {
 160                 timeout->next = prev->next;
 161                 prev->next = timeout;
 162         }
 163
 164         return 0;
 165 }
 166
 167
 168 int eloop_cancel_timeout(void (*handler)(void *eloop_ctx, void *sock_ctx),
 169                          void *eloop_data, void *user_data)
 170 {
 171         struct eloop_timeout *timeout, *prev, *next;
 172         int removed = 0;
 173
 174         prev = NULL;
 175         timeout = eloop.timeout;
 176         while (timeout != NULL) {
 177                 next = timeout->next;
 178
 179                 if (timeout->handler == handler &&
 180                     (timeout->eloop_data == eloop_data ||
 181                      eloop_data == ELOOP_ALL_CTX) &&
 182                     (timeout->user_data == user_data ||
 183                      user_data == ELOOP_ALL_CTX)) {
 184                         if (prev == NULL)
 185                                 eloop.timeout = next;
 186                         else
 187                                 prev->next = next;
 188                         free(timeout);
 189                         removed++;
 190                 } else
 191                         prev = timeout;
 192
 193                 timeout = next;
 194         }
 195
 196         return removed;
 197 }
 198
 199
 200 int eloop_is_timeout_registered(void (*handler)(void *eloop_ctx,
 201                                                 void *timeout_ctx),
 202                                 void *eloop_data, void *user_data)
 203 {
 204         struct eloop_timeout *tmp;
 205
 206         tmp = eloop.timeout;
 207         while (tmp != NULL) {
 208                 if (tmp->handler == handler &&
 209                     tmp->eloop_data == eloop_data &&
 210                     tmp->user_data == user_data)
 211                         return 1;
 212
 213                 tmp = tmp->next;
 214         }
 215
 216         return 0;
 217 }
 218
 219
 220 /* TODO: replace with suitable signal handler */
 221 #if 0
 222 static void eloop_handle_signal(int sig)
 223 {
 224         int i;
 225
 226         eloop.signaled++;
 227         for (i = 0; i < eloop.signal_count; i++) {
 228                 if (eloop.signals[i].sig == sig) {
 229                         eloop.signals[i].signaled++;
 230                         break;
 231                 }
 232         }
 233 }
 234 #endif
 235
 236
 237 static void eloop_process_pending_signals(void)
 238 {
 239         int i;
 240
 241         if (eloop.signaled == 0)
 242                 return;
 243         eloop.signaled = 0;
 244
 245         if (eloop.pending_terminate) {
 246                 eloop.pending_terminate = 0;
 247         }
 248
 249         for (i = 0; i < eloop.signal_count; i++) {
 250                 if (eloop.signals[i].signaled) {
 251                         eloop.signals[i].signaled = 0;
 252                         eloop.signals[i].handler(eloop.signals[i].sig,
 253                                                  eloop.user_data,
 254                                                  eloop.signals[i].user_data);
 255                 }
 256         }
 257 }
 258
 259
 260 int eloop_register_signal(int sig,
 261                           void (*handler)(int sig, void *eloop_ctx,
 262                                           void *signal_ctx),
 263                           void *user_data)
 264 {
 265         struct eloop_signal *tmp;
 266
 267         tmp = (struct eloop_signal *)
 268                 realloc(eloop.signals,
 269                         (eloop.signal_count + 1) *
 270                         sizeof(struct eloop_signal));
 271         if (tmp == NULL)
 272                 return -1;
 273
 274         tmp[eloop.signal_count].sig = sig;
 275         tmp[eloop.signal_count].user_data = user_data;
 276         tmp[eloop.signal_count].handler = handler;
 277         tmp[eloop.signal_count].signaled = 0;
 278         eloop.signal_count++;
 279         eloop.signals = tmp;
 280
 281         /* TODO: register signal handler */
 282
 283         return 0;
 284 }
 285
 286
 287 int eloop_register_signal_terminate(void (*handler)(int sig, void *eloop_ctx,
 288                                                     void *signal_ctx),
 289                                     void *user_data)
 290 {
 291 #if 0
 292         /* TODO: for example */
 293         int ret = eloop_register_signal(SIGINT, handler, user_data);
 294         if (ret == 0)
 295                 ret = eloop_register_signal(SIGTERM, handler, user_data);
 296         return ret;
 297 #endif
 298         return 0;
 299 }
 300
 301
 302 int eloop_register_signal_reconfig(void (*handler)(int sig, void *eloop_ctx,
 303                                                    void *signal_ctx),
 304                                    void *user_data)
 305 {
 306 #if 0
 307         /* TODO: for example */
 308         return eloop_register_signal(SIGHUP, handler, user_data);
 309 #endif
 310         return 0;
 311 }
 312
 313
 314 void eloop_run(void)
 315 {
 316         int i;
 317         struct os_time tv, now;
 318
 319         while (!eloop.terminate &&
 320                 (eloop.timeout || eloop.reader_count > 0)) {
 321                 if (eloop.timeout) {
 322                         os_get_time(&now);
 323                         if (os_time_before(&now, &eloop.timeout->time))
 324                                 os_time_sub(&eloop.timeout->time, &now, &tv);
 325                         else
 326                                 tv.sec = tv.usec = 0;
 327                 }
 328
 329                 /*
 330                  * TODO: wait for any event (read socket ready, timeout (tv),
 331                  * signal
 332                  */
 333                 os_sleep(1, 0); /* just a dummy wait for testing */
 334
 335                 eloop_process_pending_signals();
 336
 337                 /* check if some registered timeouts have occurred */
 338                 if (eloop.timeout) {
 339                         struct eloop_timeout *tmp;
 340
 341                         os_get_time(&now);
 342                         if (!os_time_before(&now, &eloop.timeout->time)) {
 343                                 tmp = eloop.timeout;
 344                                 eloop.timeout = eloop.timeout->next;
 345                                 tmp->handler(tmp->eloop_data,
 346                                              tmp->user_data);
 347                                 free(tmp);
 348                         }
 349
 350                 }
 351
 352                 eloop.reader_table_changed = 0;
 353                 for (i = 0; i < eloop.reader_count; i++) {
 354                         /*
 355                          * TODO: call each handler that has pending data to
 356                          * read
 357                          */
 358                         if (0 /* TODO: eloop.readers[i].sock ready */) {
 359                                 eloop.readers[i].handler(
 360                                         eloop.readers[i].sock,
 361                                         eloop.readers[i].eloop_data,
 362                                         eloop.readers[i].user_data);
 363                                 if (eloop.reader_table_changed)
 364                                         break;
 365                         }
 366                 }
 367         }
 368 }
 369
 370
 371 void eloop_terminate(void)
 372 {
 373         eloop.terminate = 1;
 374 }
 375
 376
 377 void eloop_destroy(void)
 378 {
 379         struct eloop_timeout *timeout, *prev;
 380
 381         timeout = eloop.timeout;
 382         while (timeout != NULL) {
 383                 prev = timeout;
 384                 timeout = timeout->next;
 385                 free(prev);
 386         }
 387         free(eloop.readers);
 388         free(eloop.signals);
 389 }
 390
 391
 392 int eloop_terminated(void)
 393 {
 394         return eloop.terminate;
 395 }
 396
 397
 398 void eloop_wait_for_read_sock(int sock)
 399 {
 400         /*
 401          * TODO: wait for the file descriptor to have something available for
 402          * reading
 403          */
 404 }
 405
 406
 407 void * eloop_get_user_data(void)
 408 {
 409         return eloop.user_data;
 410 }