1 /* 2 * Event loop based on Windows events and WaitForMultipleObjects 3 * Copyright (c) 2002-2006, Jouni Malinen <j (at) 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 #include <winsock2.h> 11 12 #include "common.h" 13 #include "eloop.h" 14 15 16 struct eloop_sock { 17 int sock; 18 void *eloop_data; 19 void *user_data; 20 eloop_sock_handler handler; 21 WSAEVENT event; 22 }; 23 24 struct eloop_event { 25 void *eloop_data; 26 void *user_data; 27 eloop_event_handler handler; 28 HANDLE event; 29 }; 30 31 struct eloop_timeout { 32 struct os_time time; 33 void *eloop_data; 34 void *user_data; 35 eloop_timeout_handler handler; 36 struct eloop_timeout *next; 37 }; 38 39 struct eloop_signal { 40 int sig; 41 void *user_data; 42 eloop_signal_handler handler; 43 int signaled; 44 }; 45 46 struct eloop_data { 47 int max_sock; 48 size_t reader_count; 49 struct eloop_sock *readers; 50 51 size_t event_count; 52 struct eloop_event *events; 53 54 struct eloop_timeout *timeout; 55 56 int signal_count; 57 struct eloop_signal *signals; 58 int signaled; 59 int pending_terminate; 60 61 int terminate; 62 int reader_table_changed; 63 64 struct eloop_signal term_signal; 65 HANDLE term_event; 66 67 HANDLE *handles; 68 size_t num_handles; 69 }; 70 71 static struct eloop_data eloop; 72 73 74 int eloop_init(void) 75 { 76 os_memset(&eloop, 0, sizeof(eloop)); 77 eloop.num_handles = 1; 78 eloop.handles = os_malloc(eloop.num_handles * 79 sizeof(eloop.handles[0])); 80 if (eloop.handles == NULL) 81 return -1; 82 83 eloop.term_event = CreateEvent(NULL, FALSE, FALSE, NULL); 84 if (eloop.term_event == NULL) { 85 printf("CreateEvent() failed: %d\n", 86 (int) GetLastError()); 87 os_free(eloop.handles); 88 return -1; 89 } 90 91 return 0; 92 } 93 94 95 static int eloop_prepare_handles(void) 96 { 97 HANDLE *n; 98 99 if (eloop.num_handles > eloop.reader_count + eloop.event_count + 8) 100 return 0; 101 n = os_realloc_array(eloop.handles, eloop.num_handles * 2, 102 sizeof(eloop.handles[0])); 103 if (n == NULL) 104 return -1; 105 eloop.handles = n; 106 eloop.num_handles *= 2; 107 return 0; 108 } 109 110 111 int eloop_register_read_sock(int sock, eloop_sock_handler handler, 112 void *eloop_data, void *user_data) 113 { 114 WSAEVENT event; 115 struct eloop_sock *tmp; 116 117 if (eloop_prepare_handles()) 118 return -1; 119 120 event = WSACreateEvent(); 121 if (event == WSA_INVALID_EVENT) { 122 printf("WSACreateEvent() failed: %d\n", WSAGetLastError()); 123 return -1; 124 } 125 126 if (WSAEventSelect(sock, event, FD_READ)) { 127 printf("WSAEventSelect() failed: %d\n", WSAGetLastError()); 128 WSACloseEvent(event); 129 return -1; 130 } 131 tmp = os_realloc_array(eloop.readers, eloop.reader_count + 1, 132 sizeof(struct eloop_sock)); 133 if (tmp == NULL) { 134 WSAEventSelect(sock, event, 0); 135 WSACloseEvent(event); 136 return -1; 137 } 138 139 tmp[eloop.reader_count].sock = sock; 140 tmp[eloop.reader_count].eloop_data = eloop_data; 141 tmp[eloop.reader_count].user_data = user_data; 142 tmp[eloop.reader_count].handler = handler; 143 tmp[eloop.reader_count].event = event; 144 eloop.reader_count++; 145 eloop.readers = tmp; 146 if (sock > eloop.max_sock) 147 eloop.max_sock = sock; 148 eloop.reader_table_changed = 1; 149 150 return 0; 151 } 152 153 154 void eloop_unregister_read_sock(int sock) 155 { 156 size_t i; 157 158 if (eloop.readers == NULL || eloop.reader_count == 0) 159 return; 160 161 for (i = 0; i < eloop.reader_count; i++) { 162 if (eloop.readers[i].sock == sock) 163 break; 164 } 165 if (i == eloop.reader_count) 166 return; 167 168 WSAEventSelect(eloop.readers[i].sock, eloop.readers[i].event, 0); 169 WSACloseEvent(eloop.readers[i].event); 170 171 if (i != eloop.reader_count - 1) { 172 os_memmove(&eloop.readers[i], &eloop.readers[i + 1], 173 (eloop.reader_count - i - 1) * 174 sizeof(struct eloop_sock)); 175 } 176 eloop.reader_count--; 177 eloop.reader_table_changed = 1; 178 } 179 180 181 int eloop_register_event(void *event, size_t event_size, 182 eloop_event_handler handler, 183 void *eloop_data, void *user_data) 184 { 185 struct eloop_event *tmp; 186 HANDLE h = event; 187 188 if (event_size != sizeof(HANDLE) || h == INVALID_HANDLE_VALUE) 189 return -1; 190 191 if (eloop_prepare_handles()) 192 return -1; 193 194 tmp = os_realloc_array(eloop.events, eloop.event_count + 1, 195 sizeof(struct eloop_event)); 196 if (tmp == NULL) 197 return -1; 198 199 tmp[eloop.event_count].eloop_data = eloop_data; 200 tmp[eloop.event_count].user_data = user_data; 201 tmp[eloop.event_count].handler = handler; 202 tmp[eloop.event_count].event = h; 203 eloop.event_count++; 204 eloop.events = tmp; 205 206 return 0; 207 } 208 209 210 void eloop_unregister_event(void *event, size_t event_size) 211 { 212 size_t i; 213 HANDLE h = event; 214 215 if (eloop.events == NULL || eloop.event_count == 0 || 216 event_size != sizeof(HANDLE)) 217 return; 218 219 for (i = 0; i < eloop.event_count; i++) { 220 if (eloop.events[i].event == h) 221 break; 222 } 223 if (i == eloop.event_count) 224 return; 225 226 if (i != eloop.event_count - 1) { 227 os_memmove(&eloop.events[i], &eloop.events[i + 1], 228 (eloop.event_count - i - 1) * 229 sizeof(struct eloop_event)); 230 } 231 eloop.event_count--; 232 } 233 234 235 int eloop_register_timeout(unsigned int secs, unsigned int usecs, 236 eloop_timeout_handler handler, 237 void *eloop_data, void *user_data) 238 { 239 struct eloop_timeout *timeout, *tmp, *prev; 240 os_time_t now_sec; 241 242 timeout = os_malloc(sizeof(*timeout)); 243 if (timeout == NULL) 244 return -1; 245 os_get_time(&timeout->time); 246 now_sec = timeout->time.sec; 247 timeout->time.sec += secs; 248 if (timeout->time.sec < now_sec) { 249 /* 250 * Integer overflow - assume long enough timeout to be assumed 251 * to be infinite, i.e., the timeout would never happen. 252 */ 253 wpa_printf(MSG_DEBUG, "ELOOP: Too long timeout (secs=%u) to " 254 "ever happen - ignore it", secs); 255 os_free(timeout); 256 return 0; 257 } 258 timeout->time.usec += usecs; 259 while (timeout->time.usec >= 1000000) { 260 timeout->time.sec++; 261 timeout->time.usec -= 1000000; 262 } 263 timeout->eloop_data = eloop_data; 264 timeout->user_data = user_data; 265 timeout->handler = handler; 266 timeout->next = NULL; 267 268 if (eloop.timeout == NULL) { 269 eloop.timeout = timeout; 270 return 0; 271 } 272 273 prev = NULL; 274 tmp = eloop.timeout; 275 while (tmp != NULL) { 276 if (os_time_before(&timeout->time, &tmp->time)) 277 break; 278 prev = tmp; 279 tmp = tmp->next; 280 } 281 282 if (prev == NULL) { 283 timeout->next = eloop.timeout; 284 eloop.timeout = timeout; 285 } else { 286 timeout->next = prev->next; 287 prev->next = timeout; 288 } 289 290 return 0; 291 } 292 293 294 int eloop_cancel_timeout(eloop_timeout_handler handler, 295 void *eloop_data, void *user_data) 296 { 297 struct eloop_timeout *timeout, *prev, *next; 298 int removed = 0; 299 300 prev = NULL; 301 timeout = eloop.timeout; 302 while (timeout != NULL) { 303 next = timeout->next; 304 305 if (timeout->handler == handler && 306 (timeout->eloop_data == eloop_data || 307 eloop_data == ELOOP_ALL_CTX) && 308 (timeout->user_data == user_data || 309 user_data == ELOOP_ALL_CTX)) { 310 if (prev == NULL) 311 eloop.timeout = next; 312 else 313 prev->next = next; 314 os_free(timeout); 315 removed++; 316 } else 317 prev = timeout; 318 319 timeout = next; 320 } 321 322 return removed; 323 } 324 325 326 int eloop_is_timeout_registered(eloop_timeout_handler handler, 327 void *eloop_data, void *user_data) 328 { 329 struct eloop_timeout *tmp; 330 331 tmp = eloop.timeout; 332 while (tmp != NULL) { 333 if (tmp->handler == handler && 334 tmp->eloop_data == eloop_data && 335 tmp->user_data == user_data) 336 return 1; 337 338 tmp = tmp->next; 339 } 340 341 return 0; 342 } 343 344 345 /* TODO: replace with suitable signal handler */ 346 #if 0 347 static void eloop_handle_signal(int sig) 348 { 349 int i; 350 351 eloop.signaled++; 352 for (i = 0; i < eloop.signal_count; i++) { 353 if (eloop.signals[i].sig == sig) { 354 eloop.signals[i].signaled++; 355 break; 356 } 357 } 358 } 359 #endif 360 361 362 static void eloop_process_pending_signals(void) 363 { 364 int i; 365 366 if (eloop.signaled == 0) 367 return; 368 eloop.signaled = 0; 369 370 if (eloop.pending_terminate) { 371 eloop.pending_terminate = 0; 372 } 373 374 for (i = 0; i < eloop.signal_count; i++) { 375 if (eloop.signals[i].signaled) { 376 eloop.signals[i].signaled = 0; 377 eloop.signals[i].handler(eloop.signals[i].sig, 378 eloop.signals[i].user_data); 379 } 380 } 381 382 if (eloop.term_signal.signaled) { 383 eloop.term_signal.signaled = 0; 384 eloop.term_signal.handler(eloop.term_signal.sig, 385 eloop.term_signal.user_data); 386 } 387 } 388 389 390 int eloop_register_signal(int sig, eloop_signal_handler handler, 391 void *user_data) 392 { 393 struct eloop_signal *tmp; 394 395 tmp = os_realloc_array(eloop.signals, eloop.signal_count + 1, 396 sizeof(struct eloop_signal)); 397 if (tmp == NULL) 398 return -1; 399 400 tmp[eloop.signal_count].sig = sig; 401 tmp[eloop.signal_count].user_data = user_data; 402 tmp[eloop.signal_count].handler = handler; 403 tmp[eloop.signal_count].signaled = 0; 404 eloop.signal_count++; 405 eloop.signals = tmp; 406 407 /* TODO: register signal handler */ 408 409 return 0; 410 } 411 412 413 #ifndef _WIN32_WCE 414 static BOOL eloop_handle_console_ctrl(DWORD type) 415 { 416 switch (type) { 417 case CTRL_C_EVENT: 418 case CTRL_BREAK_EVENT: 419 eloop.signaled++; 420 eloop.term_signal.signaled++; 421 SetEvent(eloop.term_event); 422 return TRUE; 423 default: 424 return FALSE; 425 } 426 } 427 #endif /* _WIN32_WCE */ 428 429 430 int eloop_register_signal_terminate(eloop_signal_handler handler, 431 void *user_data) 432 { 433 #ifndef _WIN32_WCE 434 if (SetConsoleCtrlHandler((PHANDLER_ROUTINE) eloop_handle_console_ctrl, 435 TRUE) == 0) { 436 printf("SetConsoleCtrlHandler() failed: %d\n", 437 (int) GetLastError()); 438 return -1; 439 } 440 #endif /* _WIN32_WCE */ 441 442 eloop.term_signal.handler = handler; 443 eloop.term_signal.user_data = user_data; 444 445 return 0; 446 } 447 448 449 int eloop_register_signal_reconfig(eloop_signal_handler handler, 450 void *user_data) 451 { 452 /* TODO */ 453 return 0; 454 } 455 456 457 void eloop_run(void) 458 { 459 struct os_time tv, now; 460 DWORD count, ret, timeout, err; 461 size_t i; 462 463 while (!eloop.terminate && 464 (eloop.timeout || eloop.reader_count > 0 || 465 eloop.event_count > 0)) { 466 tv.sec = tv.usec = 0; 467 if (eloop.timeout) { 468 os_get_time(&now); 469 if (os_time_before(&now, &eloop.timeout->time)) 470 os_time_sub(&eloop.timeout->time, &now, &tv); 471 } 472 473 count = 0; 474 for (i = 0; i < eloop.event_count; i++) 475 eloop.handles[count++] = eloop.events[i].event; 476 477 for (i = 0; i < eloop.reader_count; i++) 478 eloop.handles[count++] = eloop.readers[i].event; 479 480 if (eloop.term_event) 481 eloop.handles[count++] = eloop.term_event; 482 483 if (eloop.timeout) 484 timeout = tv.sec * 1000 + tv.usec / 1000; 485 else 486 timeout = INFINITE; 487 488 if (count > MAXIMUM_WAIT_OBJECTS) { 489 printf("WaitForMultipleObjects: Too many events: " 490 "%d > %d (ignoring extra events)\n", 491 (int) count, MAXIMUM_WAIT_OBJECTS); 492 count = MAXIMUM_WAIT_OBJECTS; 493 } 494 #ifdef _WIN32_WCE 495 ret = WaitForMultipleObjects(count, eloop.handles, FALSE, 496 timeout); 497 #else /* _WIN32_WCE */ 498 ret = WaitForMultipleObjectsEx(count, eloop.handles, FALSE, 499 timeout, TRUE); 500 #endif /* _WIN32_WCE */ 501 err = GetLastError(); 502 503 eloop_process_pending_signals(); 504 505 /* check if some registered timeouts have occurred */ 506 if (eloop.timeout) { 507 struct eloop_timeout *tmp; 508 509 os_get_time(&now); 510 if (!os_time_before(&now, &eloop.timeout->time)) { 511 tmp = eloop.timeout; 512 eloop.timeout = eloop.timeout->next; 513 tmp->handler(tmp->eloop_data, 514 tmp->user_data); 515 os_free(tmp); 516 } 517 518 } 519 520 if (ret == WAIT_FAILED) { 521 printf("WaitForMultipleObjects(count=%d) failed: %d\n", 522 (int) count, (int) err); 523 os_sleep(1, 0); 524 continue; 525 } 526 527 #ifndef _WIN32_WCE 528 if (ret == WAIT_IO_COMPLETION) 529 continue; 530 #endif /* _WIN32_WCE */ 531 532 if (ret == WAIT_TIMEOUT) 533 continue; 534 535 while (ret >= WAIT_OBJECT_0 && 536 ret < WAIT_OBJECT_0 + eloop.event_count) { 537 eloop.events[ret].handler( 538 eloop.events[ret].eloop_data, 539 eloop.events[ret].user_data); 540 ret = WaitForMultipleObjects(eloop.event_count, 541 eloop.handles, FALSE, 0); 542 } 543 544 eloop.reader_table_changed = 0; 545 for (i = 0; i < eloop.reader_count; i++) { 546 WSANETWORKEVENTS events; 547 if (WSAEnumNetworkEvents(eloop.readers[i].sock, 548 eloop.readers[i].event, 549 &events) == 0 && 550 (events.lNetworkEvents & FD_READ)) { 551 eloop.readers[i].handler( 552 eloop.readers[i].sock, 553 eloop.readers[i].eloop_data, 554 eloop.readers[i].user_data); 555 if (eloop.reader_table_changed) 556 break; 557 } 558 } 559 } 560 } 561 562 563 void eloop_terminate(void) 564 { 565 eloop.terminate = 1; 566 SetEvent(eloop.term_event); 567 } 568 569 570 void eloop_destroy(void) 571 { 572 struct eloop_timeout *timeout, *prev; 573 574 timeout = eloop.timeout; 575 while (timeout != NULL) { 576 prev = timeout; 577 timeout = timeout->next; 578 os_free(prev); 579 } 580 os_free(eloop.readers); 581 os_free(eloop.signals); 582 if (eloop.term_event) 583 CloseHandle(eloop.term_event); 584 os_free(eloop.handles); 585 eloop.handles = NULL; 586 os_free(eloop.events); 587 eloop.events = NULL; 588 } 589 590 591 int eloop_terminated(void) 592 { 593 return eloop.terminate; 594 } 595 596 597 void eloop_wait_for_read_sock(int sock) 598 { 599 WSAEVENT event; 600 601 event = WSACreateEvent(); 602 if (event == WSA_INVALID_EVENT) { 603 printf("WSACreateEvent() failed: %d\n", WSAGetLastError()); 604 return; 605 } 606 607 if (WSAEventSelect(sock, event, FD_READ)) { 608 printf("WSAEventSelect() failed: %d\n", WSAGetLastError()); 609 WSACloseEvent(event); 610 return ; 611 } 612 613 WaitForSingleObject(event, INFINITE); 614 WSAEventSelect(sock, event, 0); 615 WSACloseEvent(event); 616 } 617
