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