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