1/* 2 * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson 3 * Copyright (c) 2002-2006 Niels Provos <provos@citi.umich.edu> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include "event2/event-config.h" 30#include "evconfig-private.h" 31 32#include <sys/types.h> 33 34#ifdef EVENT__HAVE_SYS_TIME_H 35#include <sys/time.h> 36#endif 37 38#include <errno.h> 39#include <stdio.h> 40#include <stdlib.h> 41#include <string.h> 42#ifdef EVENT__HAVE_STDARG_H 43#include <stdarg.h> 44#endif 45#ifdef EVENT__HAVE_UNISTD_H 46#include <unistd.h> 47#endif 48 49#ifdef _WIN32 50#include <winsock2.h> 51#include <ws2tcpip.h> 52#endif 53 54#ifdef EVENT__HAVE_SYS_SOCKET_H 55#include <sys/socket.h> 56#endif 57#ifdef EVENT__HAVE_NETINET_IN_H 58#include <netinet/in.h> 59#endif 60#ifdef EVENT__HAVE_NETINET_IN6_H 61#include <netinet/in6.h> 62#endif 63 64#include "event2/util.h" 65#include "event2/bufferevent.h" 66#include "event2/buffer.h" 67#include "event2/bufferevent_struct.h" 68#include "event2/bufferevent_compat.h" 69#include "event2/event.h" 70#include "log-internal.h" 71#include "mm-internal.h" 72#include "bufferevent-internal.h" 73#include "util-internal.h" 74#ifdef _WIN32 75#include "iocp-internal.h" 76#endif 77 78/* prototypes */ 79static int be_socket_enable(struct bufferevent *, short); 80static int be_socket_disable(struct bufferevent *, short); 81static void be_socket_destruct(struct bufferevent *); 82static int be_socket_adj_timeouts(struct bufferevent *); 83static int be_socket_flush(struct bufferevent *, short, enum bufferevent_flush_mode); 84static int be_socket_ctrl(struct bufferevent *, enum bufferevent_ctrl_op, union bufferevent_ctrl_data *); 85 86static void be_socket_setfd(struct bufferevent *, evutil_socket_t); 87 88const struct bufferevent_ops bufferevent_ops_socket = { 89 "socket", 90 evutil_offsetof(struct bufferevent_private, bev), 91 be_socket_enable, 92 be_socket_disable, 93 NULL, /* unlink */ 94 be_socket_destruct, 95 be_socket_adj_timeouts, 96 be_socket_flush, 97 be_socket_ctrl, 98}; 99 100#define be_socket_add(ev, t) \ 101 bufferevent_add_event_((ev), (t)) 102 103static void 104bufferevent_socket_outbuf_cb(struct evbuffer *buf, 105 const struct evbuffer_cb_info *cbinfo, 106 void *arg) 107{ 108 struct bufferevent *bufev = arg; 109 struct bufferevent_private *bufev_p = 110 EVUTIL_UPCAST(bufev, struct bufferevent_private, bev); 111 112 if (cbinfo->n_added && 113 (bufev->enabled & EV_WRITE) && 114 !event_pending(&bufev->ev_write, EV_WRITE, NULL) && 115 !bufev_p->write_suspended) { 116 /* Somebody added data to the buffer, and we would like to 117 * write, and we were not writing. So, start writing. */ 118 if (be_socket_add(&bufev->ev_write, &bufev->timeout_write) == -1) { 119 /* Should we log this? */ 120 } 121 } 122} 123 124static void 125bufferevent_readcb(evutil_socket_t fd, short event, void *arg) 126{ 127 struct bufferevent *bufev = arg; 128 struct bufferevent_private *bufev_p = 129 EVUTIL_UPCAST(bufev, struct bufferevent_private, bev); 130 struct evbuffer *input; 131 int res = 0; 132 short what = BEV_EVENT_READING; 133 ev_ssize_t howmuch = -1, readmax=-1; 134 135 bufferevent_incref_and_lock_(bufev); 136 137 if (event == EV_TIMEOUT) { 138 /* Note that we only check for event==EV_TIMEOUT. If 139 * event==EV_TIMEOUT|EV_READ, we can safely ignore the 140 * timeout, since a read has occurred */ 141 what |= BEV_EVENT_TIMEOUT; 142 goto error; 143 } 144 145 input = bufev->input; 146 147 /* 148 * If we have a high watermark configured then we don't want to 149 * read more data than would make us reach the watermark. 150 */ 151 if (bufev->wm_read.high != 0) { 152 howmuch = bufev->wm_read.high - evbuffer_get_length(input); 153 /* we somehow lowered the watermark, stop reading */ 154 if (howmuch <= 0) { 155 bufferevent_wm_suspend_read(bufev); 156 goto done; 157 } 158 } 159 readmax = bufferevent_get_read_max_(bufev_p); 160 if (howmuch < 0 || howmuch > readmax) /* The use of -1 for "unlimited" 161 * uglifies this code. XXXX */ 162 howmuch = readmax; 163 if (bufev_p->read_suspended) 164 goto done; 165 166 evbuffer_unfreeze(input, 0); 167 res = evbuffer_read(input, fd, (int)howmuch); /* XXXX evbuffer_read would do better to take and return ev_ssize_t */ 168 evbuffer_freeze(input, 0); 169 170 if (res == -1) { 171 int err = evutil_socket_geterror(fd); 172 if (EVUTIL_ERR_RW_RETRIABLE(err)) 173 goto reschedule; 174 /* error case */ 175 what |= BEV_EVENT_ERROR; 176 } else if (res == 0) { 177 /* eof case */ 178 what |= BEV_EVENT_EOF; 179 } 180 181 if (res <= 0) 182 goto error; 183 184 bufferevent_decrement_read_buckets_(bufev_p, res); 185 186 /* Invoke the user callback - must always be called last */ 187 bufferevent_trigger_nolock_(bufev, EV_READ, 0); 188 189 goto done; 190 191 reschedule: 192 goto done; 193 194 error: 195 bufferevent_disable(bufev, EV_READ); 196 bufferevent_run_eventcb_(bufev, what, 0); 197 198 done: 199 bufferevent_decref_and_unlock_(bufev); 200} 201 202static void 203bufferevent_writecb(evutil_socket_t fd, short event, void *arg) 204{ 205 struct bufferevent *bufev = arg; 206 struct bufferevent_private *bufev_p = 207 EVUTIL_UPCAST(bufev, struct bufferevent_private, bev); 208 int res = 0; 209 short what = BEV_EVENT_WRITING; 210 int connected = 0; 211 ev_ssize_t atmost = -1; 212 213 bufferevent_incref_and_lock_(bufev); 214 215 if (event == EV_TIMEOUT) { 216 /* Note that we only check for event==EV_TIMEOUT. If 217 * event==EV_TIMEOUT|EV_WRITE, we can safely ignore the 218 * timeout, since a read has occurred */ 219 what |= BEV_EVENT_TIMEOUT; 220 goto error; 221 } 222 if (bufev_p->connecting) { 223 int c = evutil_socket_finished_connecting_(fd); 224 /* we need to fake the error if the connection was refused 225 * immediately - usually connection to localhost on BSD */ 226 if (bufev_p->connection_refused) { 227 bufev_p->connection_refused = 0; 228 c = -1; 229 } 230 231 if (c == 0) 232 goto done; 233 234 bufev_p->connecting = 0; 235 if (c < 0) { 236 event_del(&bufev->ev_write); 237 event_del(&bufev->ev_read); 238 bufferevent_run_eventcb_(bufev, BEV_EVENT_ERROR, 0); 239 goto done; 240 } else { 241 connected = 1; 242#ifdef _WIN32 243 if (BEV_IS_ASYNC(bufev)) { 244 event_del(&bufev->ev_write); 245 bufferevent_async_set_connected_(bufev); 246 bufferevent_run_eventcb_(bufev, 247 BEV_EVENT_CONNECTED, 0); 248 goto done; 249 } 250#endif 251 bufferevent_run_eventcb_(bufev, 252 BEV_EVENT_CONNECTED, 0); 253 if (!(bufev->enabled & EV_WRITE) || 254 bufev_p->write_suspended) { 255 event_del(&bufev->ev_write); 256 goto done; 257 } 258 } 259 } 260 261 atmost = bufferevent_get_write_max_(bufev_p); 262 263 if (bufev_p->write_suspended) 264 goto done; 265 266 if (evbuffer_get_length(bufev->output)) { 267 evbuffer_unfreeze(bufev->output, 1); 268 res = evbuffer_write_atmost(bufev->output, fd, atmost); 269 evbuffer_freeze(bufev->output, 1); 270 if (res == -1) { 271 int err = evutil_socket_geterror(fd); 272 if (EVUTIL_ERR_RW_RETRIABLE(err)) 273 goto reschedule; 274 what |= BEV_EVENT_ERROR; 275 } else if (res == 0) { 276 /* eof case 277 XXXX Actually, a 0 on write doesn't indicate 278 an EOF. An ECONNRESET might be more typical. 279 */ 280 what |= BEV_EVENT_EOF; 281 } 282 if (res <= 0) 283 goto error; 284 285 bufferevent_decrement_write_buckets_(bufev_p, res); 286 } 287 288 if (evbuffer_get_length(bufev->output) == 0) { 289 event_del(&bufev->ev_write); 290 } 291 292 /* 293 * Invoke the user callback if our buffer is drained or below the 294 * low watermark. 295 */ 296 if (res || !connected) { 297 bufferevent_trigger_nolock_(bufev, EV_WRITE, 0); 298 } 299 300 goto done; 301 302 reschedule: 303 if (evbuffer_get_length(bufev->output) == 0) { 304 event_del(&bufev->ev_write); 305 } 306 goto done; 307 308 error: 309 bufferevent_disable(bufev, EV_WRITE); 310 bufferevent_run_eventcb_(bufev, what, 0); 311 312 done: 313 bufferevent_decref_and_unlock_(bufev); 314} 315 316struct bufferevent * 317bufferevent_socket_new(struct event_base *base, evutil_socket_t fd, 318 int options) 319{ 320 struct bufferevent_private *bufev_p; 321 struct bufferevent *bufev; 322 323#ifdef _WIN32 324 if (base && event_base_get_iocp_(base)) 325 return bufferevent_async_new_(base, fd, options); 326#endif 327 328 if ((bufev_p = mm_calloc(1, sizeof(struct bufferevent_private)))== NULL) 329 return NULL; 330 331 if (bufferevent_init_common_(bufev_p, base, &bufferevent_ops_socket, 332 options) < 0) { 333 mm_free(bufev_p); 334 return NULL; 335 } 336 bufev = &bufev_p->bev; 337 evbuffer_set_flags(bufev->output, EVBUFFER_FLAG_DRAINS_TO_FD); 338 339 event_assign(&bufev->ev_read, bufev->ev_base, fd, 340 EV_READ|EV_PERSIST|EV_FINALIZE, bufferevent_readcb, bufev); 341 event_assign(&bufev->ev_write, bufev->ev_base, fd, 342 EV_WRITE|EV_PERSIST|EV_FINALIZE, bufferevent_writecb, bufev); 343 344 evbuffer_add_cb(bufev->output, bufferevent_socket_outbuf_cb, bufev); 345 346 evbuffer_freeze(bufev->input, 0); 347 evbuffer_freeze(bufev->output, 1); 348 349 return bufev; 350} 351 352int 353bufferevent_socket_connect(struct bufferevent *bev, 354 struct sockaddr *sa, int socklen) 355{ 356 struct bufferevent_private *bufev_p = 357 EVUTIL_UPCAST(bev, struct bufferevent_private, bev); 358 359 evutil_socket_t fd; 360 int r = 0; 361 int result=-1; 362 int ownfd = 0; 363 364 bufferevent_incref_and_lock_(bev); 365 366 if (!bufev_p) 367 goto done; 368 369 fd = bufferevent_getfd(bev); 370 if (fd < 0) { 371 if (!sa) 372 goto done; 373 fd = evutil_socket_(sa->sa_family, 374 SOCK_STREAM|EVUTIL_SOCK_NONBLOCK, 0); 375 if (fd < 0) 376 goto done; 377 ownfd = 1; 378 } 379 if (sa) { 380#ifdef _WIN32 381 if (bufferevent_async_can_connect_(bev)) { 382 bufferevent_setfd(bev, fd); 383 r = bufferevent_async_connect_(bev, fd, sa, socklen); 384 if (r < 0) 385 goto freesock; 386 bufev_p->connecting = 1; 387 result = 0; 388 goto done; 389 } else 390#endif 391 r = evutil_socket_connect_(&fd, sa, socklen); 392 if (r < 0) 393 goto freesock; 394 } 395#ifdef _WIN32 396 /* ConnectEx() isn't always around, even when IOCP is enabled. 397 * Here, we borrow the socket object's write handler to fall back 398 * on a non-blocking connect() when ConnectEx() is unavailable. */ 399 if (BEV_IS_ASYNC(bev)) { 400 event_assign(&bev->ev_write, bev->ev_base, fd, 401 EV_WRITE|EV_PERSIST|EV_FINALIZE, bufferevent_writecb, bev); 402 } 403#endif 404 bufferevent_setfd(bev, fd); 405 if (r == 0) { 406 if (! be_socket_enable(bev, EV_WRITE)) { 407 bufev_p->connecting = 1; 408 result = 0; 409 goto done; 410 } 411 } else if (r == 1) { 412 /* The connect succeeded already. How very BSD of it. */ 413 result = 0; 414 bufev_p->connecting = 1; 415 event_active(&bev->ev_write, EV_WRITE, 1); 416 } else { 417 /* The connect failed already. How very BSD of it. */ 418 bufev_p->connection_refused = 1; 419 bufev_p->connecting = 1; 420 result = 0; 421 event_active(&bev->ev_write, EV_WRITE, 1); 422 } 423 424 goto done; 425 426freesock: 427 bufferevent_run_eventcb_(bev, BEV_EVENT_ERROR, 0); 428 if (ownfd) 429 evutil_closesocket(fd); 430 /* do something about the error? */ 431done: 432 bufferevent_decref_and_unlock_(bev); 433 return result; 434} 435 436static void 437bufferevent_connect_getaddrinfo_cb(int result, struct evutil_addrinfo *ai, 438 void *arg) 439{ 440 struct bufferevent *bev = arg; 441 struct bufferevent_private *bev_p = 442 EVUTIL_UPCAST(bev, struct bufferevent_private, bev); 443 int r; 444 BEV_LOCK(bev); 445 446 bufferevent_unsuspend_write_(bev, BEV_SUSPEND_LOOKUP); 447 bufferevent_unsuspend_read_(bev, BEV_SUSPEND_LOOKUP); 448 449 if (result != 0) { 450 bev_p->dns_error = result; 451 bufferevent_run_eventcb_(bev, BEV_EVENT_ERROR, 0); 452 bufferevent_decref_and_unlock_(bev); 453 if (ai) 454 evutil_freeaddrinfo(ai); 455 return; 456 } 457 458 /* XXX use the other addrinfos? */ 459 /* XXX use this return value */ 460 r = bufferevent_socket_connect(bev, ai->ai_addr, (int)ai->ai_addrlen); 461 (void)r; 462 bufferevent_decref_and_unlock_(bev); 463 evutil_freeaddrinfo(ai); 464} 465 466int 467bufferevent_socket_connect_hostname(struct bufferevent *bev, 468 struct evdns_base *evdns_base, int family, const char *hostname, int port) 469{ 470 char portbuf[10]; 471 struct evutil_addrinfo hint; 472 int err; 473 struct bufferevent_private *bev_p = 474 EVUTIL_UPCAST(bev, struct bufferevent_private, bev); 475 476 if (family != AF_INET && family != AF_INET6 && family != AF_UNSPEC) 477 return -1; 478 if (port < 1 || port > 65535) 479 return -1; 480 481 BEV_LOCK(bev); 482 bev_p->dns_error = 0; 483 BEV_UNLOCK(bev); 484 485 evutil_snprintf(portbuf, sizeof(portbuf), "%d", port); 486 487 memset(&hint, 0, sizeof(hint)); 488 hint.ai_family = family; 489 hint.ai_protocol = IPPROTO_TCP; 490 hint.ai_socktype = SOCK_STREAM; 491 492 bufferevent_suspend_write_(bev, BEV_SUSPEND_LOOKUP); 493 bufferevent_suspend_read_(bev, BEV_SUSPEND_LOOKUP); 494 495 bufferevent_incref_(bev); 496 err = evutil_getaddrinfo_async_(evdns_base, hostname, portbuf, 497 &hint, bufferevent_connect_getaddrinfo_cb, bev); 498 499 if (err == 0) { 500 return 0; 501 } else { 502 bufferevent_unsuspend_write_(bev, BEV_SUSPEND_LOOKUP); 503 bufferevent_unsuspend_read_(bev, BEV_SUSPEND_LOOKUP); 504 bufferevent_decref_(bev); 505 return -1; 506 } 507} 508 509int 510bufferevent_socket_get_dns_error(struct bufferevent *bev) 511{ 512 int rv; 513 struct bufferevent_private *bev_p = 514 EVUTIL_UPCAST(bev, struct bufferevent_private, bev); 515 516 BEV_LOCK(bev); 517 rv = bev_p->dns_error; 518 BEV_UNLOCK(bev); 519 520 return rv; 521} 522 523/* 524 * Create a new buffered event object. 525 * 526 * The read callback is invoked whenever we read new data. 527 * The write callback is invoked whenever the output buffer is drained. 528 * The error callback is invoked on a write/read error or on EOF. 529 * 530 * Both read and write callbacks maybe NULL. The error callback is not 531 * allowed to be NULL and have to be provided always. 532 */ 533 534struct bufferevent * 535bufferevent_new(evutil_socket_t fd, 536 bufferevent_data_cb readcb, bufferevent_data_cb writecb, 537 bufferevent_event_cb eventcb, void *cbarg) 538{ 539 struct bufferevent *bufev; 540 541 if (!(bufev = bufferevent_socket_new(NULL, fd, 0))) 542 return NULL; 543 544 bufferevent_setcb(bufev, readcb, writecb, eventcb, cbarg); 545 546 return bufev; 547} 548 549 550static int 551be_socket_enable(struct bufferevent *bufev, short event) 552{ 553 if (event & EV_READ) { 554 if (be_socket_add(&bufev->ev_read,&bufev->timeout_read) == -1) 555 return -1; 556 } 557 if (event & EV_WRITE) { 558 if (be_socket_add(&bufev->ev_write,&bufev->timeout_write) == -1) 559 return -1; 560 } 561 return 0; 562} 563 564static int 565be_socket_disable(struct bufferevent *bufev, short event) 566{ 567 struct bufferevent_private *bufev_p = 568 EVUTIL_UPCAST(bufev, struct bufferevent_private, bev); 569 if (event & EV_READ) { 570 if (event_del(&bufev->ev_read) == -1) 571 return -1; 572 } 573 /* Don't actually disable the write if we are trying to connect. */ 574 if ((event & EV_WRITE) && ! bufev_p->connecting) { 575 if (event_del(&bufev->ev_write) == -1) 576 return -1; 577 } 578 return 0; 579} 580 581static void 582be_socket_destruct(struct bufferevent *bufev) 583{ 584 struct bufferevent_private *bufev_p = 585 EVUTIL_UPCAST(bufev, struct bufferevent_private, bev); 586 evutil_socket_t fd; 587 EVUTIL_ASSERT(bufev->be_ops == &bufferevent_ops_socket); 588 589 fd = event_get_fd(&bufev->ev_read); 590 591 if ((bufev_p->options & BEV_OPT_CLOSE_ON_FREE) && fd >= 0) 592 EVUTIL_CLOSESOCKET(fd); 593} 594 595static int 596be_socket_adj_timeouts(struct bufferevent *bufev) 597{ 598 int r = 0; 599 if (event_pending(&bufev->ev_read, EV_READ, NULL)) { 600 if (evutil_timerisset(&bufev->timeout_read)) { 601 if (be_socket_add(&bufev->ev_read, &bufev->timeout_read) < 0) 602 r = -1; 603 } else { 604 event_remove_timer(&bufev->ev_read); 605 } 606 } 607 if (event_pending(&bufev->ev_write, EV_WRITE, NULL)) { 608 if (evutil_timerisset(&bufev->timeout_write)) { 609 if (be_socket_add(&bufev->ev_write, &bufev->timeout_write) < 0) 610 r = -1; 611 } else { 612 event_remove_timer(&bufev->ev_write); 613 } 614 } 615 return r; 616} 617 618static int 619be_socket_flush(struct bufferevent *bev, short iotype, 620 enum bufferevent_flush_mode mode) 621{ 622 return 0; 623} 624 625 626static void 627be_socket_setfd(struct bufferevent *bufev, evutil_socket_t fd) 628{ 629 BEV_LOCK(bufev); 630 EVUTIL_ASSERT(bufev->be_ops == &bufferevent_ops_socket); 631 632 event_del(&bufev->ev_read); 633 event_del(&bufev->ev_write); 634 635 event_assign(&bufev->ev_read, bufev->ev_base, fd, 636 EV_READ|EV_PERSIST|EV_FINALIZE, bufferevent_readcb, bufev); 637 event_assign(&bufev->ev_write, bufev->ev_base, fd, 638 EV_WRITE|EV_PERSIST|EV_FINALIZE, bufferevent_writecb, bufev); 639 640 if (fd >= 0) 641 bufferevent_enable(bufev, bufev->enabled); 642 643 BEV_UNLOCK(bufev); 644} 645 646/* XXXX Should non-socket bufferevents support this? */ 647int 648bufferevent_priority_set(struct bufferevent *bufev, int priority) 649{ 650 int r = -1; 651 struct bufferevent_private *bufev_p = 652 EVUTIL_UPCAST(bufev, struct bufferevent_private, bev); 653 654 BEV_LOCK(bufev); 655 if (bufev->be_ops != &bufferevent_ops_socket) 656 goto done; 657 658 if (event_priority_set(&bufev->ev_read, priority) == -1) 659 goto done; 660 if (event_priority_set(&bufev->ev_write, priority) == -1) 661 goto done; 662 663 event_deferred_cb_set_priority_(&bufev_p->deferred, priority); 664 665 r = 0; 666done: 667 BEV_UNLOCK(bufev); 668 return r; 669} 670 671/* XXXX Should non-socket bufferevents support this? */ 672int 673bufferevent_base_set(struct event_base *base, struct bufferevent *bufev) 674{ 675 int res = -1; 676 677 BEV_LOCK(bufev); 678 if (bufev->be_ops != &bufferevent_ops_socket) 679 goto done; 680 681 bufev->ev_base = base; 682 683 res = event_base_set(base, &bufev->ev_read); 684 if (res == -1) 685 goto done; 686 687 res = event_base_set(base, &bufev->ev_write); 688done: 689 BEV_UNLOCK(bufev); 690 return res; 691} 692 693static int 694be_socket_ctrl(struct bufferevent *bev, enum bufferevent_ctrl_op op, 695 union bufferevent_ctrl_data *data) 696{ 697 switch (op) { 698 case BEV_CTRL_SET_FD: 699 be_socket_setfd(bev, data->fd); 700 return 0; 701 case BEV_CTRL_GET_FD: 702 data->fd = event_get_fd(&bev->ev_read); 703 return 0; 704 case BEV_CTRL_GET_UNDERLYING: 705 case BEV_CTRL_CANCEL_ALL: 706 default: 707 return -1; 708 } 709} 710