1 /* 2 * util/tube.c - pipe service 3 * 4 * Copyright (c) 2008, NLnet Labs. All rights reserved. 5 * 6 * This software is open source. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * Redistributions of source code must retain the above copyright notice, 13 * this list of conditions and the following disclaimer. 14 * 15 * Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 19 * Neither the name of the NLNET LABS nor the names of its contributors may 20 * be used to endorse or promote products derived from this software without 21 * specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE 27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /** 37 * \file 38 * 39 * This file contains pipe service functions. 40 */ 41 #include "config.h" 42 #include "util/tube.h" 43 #include "util/log.h" 44 #include "util/net_help.h" 45 #include "util/netevent.h" 46 #include "util/fptr_wlist.h" 47 48 #ifndef USE_WINSOCK 49 /* on unix */ 50 51 #ifndef HAVE_SOCKETPAIR 52 /** no socketpair() available, like on Minix 3.1.7, use pipe */ 53 #define socketpair(f, t, p, sv) pipe(sv) 54 #endif /* HAVE_SOCKETPAIR */ 55 56 struct tube* tube_create(void) 57 { 58 struct tube* tube = (struct tube*)calloc(1, sizeof(*tube)); 59 int sv[2]; 60 if(!tube) { 61 int err = errno; 62 log_err("tube_create: out of memory"); 63 errno = err; 64 return NULL; 65 } 66 tube->sr = -1; 67 tube->sw = -1; 68 if(socketpair(AF_UNIX, SOCK_STREAM, 0, sv) == -1) { 69 int err = errno; 70 log_err("socketpair: %s", strerror(errno)); 71 free(tube); 72 errno = err; 73 return NULL; 74 } 75 tube->sr = sv[0]; 76 tube->sw = sv[1]; 77 if(!fd_set_nonblock(tube->sr) || !fd_set_nonblock(tube->sw)) { 78 int err = errno; 79 log_err("tube: cannot set nonblocking"); 80 tube_delete(tube); 81 errno = err; 82 return NULL; 83 } 84 return tube; 85 } 86 87 void tube_delete(struct tube* tube) 88 { 89 if(!tube) return; 90 tube_remove_bg_listen(tube); 91 tube_remove_bg_write(tube); 92 /* close fds after deleting commpoints, to be sure. 93 * Also epoll does not like closing fd before event_del */ 94 tube_close_read(tube); 95 tube_close_write(tube); 96 free(tube); 97 } 98 99 void tube_close_read(struct tube* tube) 100 { 101 if(tube->sr != -1) { 102 close(tube->sr); 103 tube->sr = -1; 104 } 105 } 106 107 void tube_close_write(struct tube* tube) 108 { 109 if(tube->sw != -1) { 110 close(tube->sw); 111 tube->sw = -1; 112 } 113 } 114 115 void tube_remove_bg_listen(struct tube* tube) 116 { 117 if(tube->listen_com) { 118 comm_point_delete(tube->listen_com); 119 tube->listen_com = NULL; 120 } 121 if(tube->cmd_msg) { 122 free(tube->cmd_msg); 123 tube->cmd_msg = NULL; 124 } 125 } 126 127 void tube_remove_bg_write(struct tube* tube) 128 { 129 if(tube->res_com) { 130 comm_point_delete(tube->res_com); 131 tube->res_com = NULL; 132 } 133 if(tube->res_list) { 134 struct tube_res_list* np, *p = tube->res_list; 135 tube->res_list = NULL; 136 tube->res_last = NULL; 137 while(p) { 138 np = p->next; 139 free(p->buf); 140 free(p); 141 p = np; 142 } 143 } 144 } 145 146 int 147 tube_handle_listen(struct comm_point* c, void* arg, int error, 148 struct comm_reply* ATTR_UNUSED(reply_info)) 149 { 150 struct tube* tube = (struct tube*)arg; 151 ssize_t r; 152 if(error != NETEVENT_NOERROR) { 153 fptr_ok(fptr_whitelist_tube_listen(tube->listen_cb)); 154 (*tube->listen_cb)(tube, NULL, 0, error, tube->listen_arg); 155 return 0; 156 } 157 158 if(tube->cmd_read < sizeof(tube->cmd_len)) { 159 /* complete reading the length of control msg */ 160 r = read(c->fd, ((uint8_t*)&tube->cmd_len) + tube->cmd_read, 161 sizeof(tube->cmd_len) - tube->cmd_read); 162 if(r==0) { 163 /* error has happened or */ 164 /* parent closed pipe, must have exited somehow */ 165 fptr_ok(fptr_whitelist_tube_listen(tube->listen_cb)); 166 (*tube->listen_cb)(tube, NULL, 0, NETEVENT_CLOSED, 167 tube->listen_arg); 168 return 0; 169 } 170 if(r==-1) { 171 if(errno != EAGAIN && errno != EINTR) { 172 log_err("rpipe error: %s", strerror(errno)); 173 } 174 /* nothing to read now, try later */ 175 return 0; 176 } 177 tube->cmd_read += r; 178 if(tube->cmd_read < sizeof(tube->cmd_len)) { 179 /* not complete, try later */ 180 return 0; 181 } 182 tube->cmd_msg = (uint8_t*)calloc(1, tube->cmd_len); 183 if(!tube->cmd_msg) { 184 log_err("malloc failure"); 185 tube->cmd_read = 0; 186 return 0; 187 } 188 } 189 /* cmd_len has been read, read remainder */ 190 r = read(c->fd, tube->cmd_msg+tube->cmd_read-sizeof(tube->cmd_len), 191 tube->cmd_len - (tube->cmd_read - sizeof(tube->cmd_len))); 192 if(r==0) { 193 /* error has happened or */ 194 /* parent closed pipe, must have exited somehow */ 195 fptr_ok(fptr_whitelist_tube_listen(tube->listen_cb)); 196 (*tube->listen_cb)(tube, NULL, 0, NETEVENT_CLOSED, 197 tube->listen_arg); 198 return 0; 199 } 200 if(r==-1) { 201 /* nothing to read now, try later */ 202 if(errno != EAGAIN && errno != EINTR) { 203 log_err("rpipe error: %s", strerror(errno)); 204 } 205 return 0; 206 } 207 tube->cmd_read += r; 208 if(tube->cmd_read < sizeof(tube->cmd_len) + tube->cmd_len) { 209 /* not complete, try later */ 210 return 0; 211 } 212 tube->cmd_read = 0; 213 214 fptr_ok(fptr_whitelist_tube_listen(tube->listen_cb)); 215 (*tube->listen_cb)(tube, tube->cmd_msg, tube->cmd_len, 216 NETEVENT_NOERROR, tube->listen_arg); 217 /* also frees the buf */ 218 tube->cmd_msg = NULL; 219 return 0; 220 } 221 222 int 223 tube_handle_write(struct comm_point* c, void* arg, int error, 224 struct comm_reply* ATTR_UNUSED(reply_info)) 225 { 226 struct tube* tube = (struct tube*)arg; 227 struct tube_res_list* item = tube->res_list; 228 ssize_t r; 229 if(error != NETEVENT_NOERROR) { 230 log_err("tube_handle_write net error %d", error); 231 return 0; 232 } 233 234 if(!item) { 235 comm_point_stop_listening(c); 236 return 0; 237 } 238 239 if(tube->res_write < sizeof(item->len)) { 240 r = write(c->fd, ((uint8_t*)&item->len) + tube->res_write, 241 sizeof(item->len) - tube->res_write); 242 if(r == -1) { 243 if(errno != EAGAIN && errno != EINTR) { 244 log_err("wpipe error: %s", strerror(errno)); 245 } 246 return 0; /* try again later */ 247 } 248 if(r == 0) { 249 /* error on pipe, must have exited somehow */ 250 /* cannot signal this to pipe user */ 251 return 0; 252 } 253 tube->res_write += r; 254 if(tube->res_write < sizeof(item->len)) 255 return 0; 256 } 257 r = write(c->fd, item->buf + tube->res_write - sizeof(item->len), 258 item->len - (tube->res_write - sizeof(item->len))); 259 if(r == -1) { 260 if(errno != EAGAIN && errno != EINTR) { 261 log_err("wpipe error: %s", strerror(errno)); 262 } 263 return 0; /* try again later */ 264 } 265 if(r == 0) { 266 /* error on pipe, must have exited somehow */ 267 /* cannot signal this to pipe user */ 268 return 0; 269 } 270 tube->res_write += r; 271 if(tube->res_write < sizeof(item->len) + item->len) 272 return 0; 273 /* done this result, remove it */ 274 free(item->buf); 275 item->buf = NULL; 276 tube->res_list = tube->res_list->next; 277 free(item); 278 if(!tube->res_list) { 279 tube->res_last = NULL; 280 comm_point_stop_listening(c); 281 } 282 tube->res_write = 0; 283 return 0; 284 } 285 286 int tube_write_msg(struct tube* tube, uint8_t* buf, uint32_t len, 287 int nonblock) 288 { 289 ssize_t r, d; 290 int fd = tube->sw; 291 292 /* test */ 293 if(nonblock) { 294 r = write(fd, &len, sizeof(len)); 295 if(r == -1) { 296 if(errno==EINTR || errno==EAGAIN) 297 return -1; 298 log_err("tube msg write failed: %s", strerror(errno)); 299 return -1; /* can still continue, perhaps */ 300 } 301 } else r = 0; 302 if(!fd_set_block(fd)) 303 return 0; 304 /* write remainder */ 305 d = r; 306 while(d != (ssize_t)sizeof(len)) { 307 if((r=write(fd, ((char*)&len)+d, sizeof(len)-d)) == -1) { 308 log_err("tube msg write failed: %s", strerror(errno)); 309 (void)fd_set_nonblock(fd); 310 return 0; 311 } 312 d += r; 313 } 314 d = 0; 315 while(d != (ssize_t)len) { 316 if((r=write(fd, buf+d, len-d)) == -1) { 317 log_err("tube msg write failed: %s", strerror(errno)); 318 (void)fd_set_nonblock(fd); 319 return 0; 320 } 321 d += r; 322 } 323 if(!fd_set_nonblock(fd)) 324 return 0; 325 return 1; 326 } 327 328 int tube_read_msg(struct tube* tube, uint8_t** buf, uint32_t* len, 329 int nonblock) 330 { 331 ssize_t r, d; 332 int fd = tube->sr; 333 334 /* test */ 335 *len = 0; 336 if(nonblock) { 337 r = read(fd, len, sizeof(*len)); 338 if(r == -1) { 339 if(errno==EINTR || errno==EAGAIN) 340 return -1; 341 log_err("tube msg read failed: %s", strerror(errno)); 342 return -1; /* we can still continue, perhaps */ 343 } 344 if(r == 0) /* EOF */ 345 return 0; 346 } else r = 0; 347 if(!fd_set_block(fd)) 348 return 0; 349 /* read remainder */ 350 d = r; 351 while(d != (ssize_t)sizeof(*len)) { 352 if((r=read(fd, ((char*)len)+d, sizeof(*len)-d)) == -1) { 353 log_err("tube msg read failed: %s", strerror(errno)); 354 (void)fd_set_nonblock(fd); 355 return 0; 356 } 357 if(r == 0) /* EOF */ { 358 (void)fd_set_nonblock(fd); 359 return 0; 360 } 361 d += r; 362 } 363 log_assert(*len < 65536*2); 364 *buf = (uint8_t*)malloc(*len); 365 if(!*buf) { 366 log_err("tube read out of memory"); 367 (void)fd_set_nonblock(fd); 368 return 0; 369 } 370 d = 0; 371 while(d != (ssize_t)*len) { 372 if((r=read(fd, (*buf)+d, (size_t)((ssize_t)*len)-d)) == -1) { 373 log_err("tube msg read failed: %s", strerror(errno)); 374 (void)fd_set_nonblock(fd); 375 free(*buf); 376 return 0; 377 } 378 if(r == 0) { /* EOF */ 379 (void)fd_set_nonblock(fd); 380 free(*buf); 381 return 0; 382 } 383 d += r; 384 } 385 if(!fd_set_nonblock(fd)) { 386 free(*buf); 387 return 0; 388 } 389 return 1; 390 } 391 392 /** perform a select() on the fd */ 393 static int 394 pollit(int fd, struct timeval* t) 395 { 396 fd_set r; 397 #ifndef S_SPLINT_S 398 FD_ZERO(&r); 399 FD_SET(FD_SET_T fd, &r); 400 #endif 401 if(select(fd+1, &r, NULL, NULL, t) == -1) { 402 return 0; 403 } 404 errno = 0; 405 return (int)(FD_ISSET(fd, &r)); 406 } 407 408 int tube_poll(struct tube* tube) 409 { 410 struct timeval t; 411 memset(&t, 0, sizeof(t)); 412 return pollit(tube->sr, &t); 413 } 414 415 int tube_wait(struct tube* tube) 416 { 417 return pollit(tube->sr, NULL); 418 } 419 420 int tube_read_fd(struct tube* tube) 421 { 422 return tube->sr; 423 } 424 425 int tube_setup_bg_listen(struct tube* tube, struct comm_base* base, 426 tube_callback_t* cb, void* arg) 427 { 428 tube->listen_cb = cb; 429 tube->listen_arg = arg; 430 if(!(tube->listen_com = comm_point_create_raw(base, tube->sr, 431 0, tube_handle_listen, tube))) { 432 int err = errno; 433 log_err("tube_setup_bg_l: commpoint creation failed"); 434 errno = err; 435 return 0; 436 } 437 return 1; 438 } 439 440 int tube_setup_bg_write(struct tube* tube, struct comm_base* base) 441 { 442 if(!(tube->res_com = comm_point_create_raw(base, tube->sw, 443 1, tube_handle_write, tube))) { 444 int err = errno; 445 log_err("tube_setup_bg_w: commpoint creation failed"); 446 errno = err; 447 return 0; 448 } 449 return 1; 450 } 451 452 int tube_queue_item(struct tube* tube, uint8_t* msg, size_t len) 453 { 454 struct tube_res_list* item = 455 (struct tube_res_list*)malloc(sizeof(*item)); 456 if(!item) { 457 free(msg); 458 log_err("out of memory for async answer"); 459 return 0; 460 } 461 item->buf = msg; 462 item->len = len; 463 item->next = NULL; 464 /* add at back of list, since the first one may be partially written */ 465 if(tube->res_last) 466 tube->res_last->next = item; 467 else tube->res_list = item; 468 tube->res_last = item; 469 if(tube->res_list == tube->res_last) { 470 /* first added item, start the write process */ 471 comm_point_start_listening(tube->res_com, -1, -1); 472 } 473 return 1; 474 } 475 476 void tube_handle_signal(int ATTR_UNUSED(fd), short ATTR_UNUSED(events), 477 void* ATTR_UNUSED(arg)) 478 { 479 log_assert(0); 480 } 481 482 #else /* USE_WINSOCK */ 483 /* on windows */ 484 485 486 struct tube* tube_create(void) 487 { 488 /* windows does not have forks like unix, so we only support 489 * threads on windows. And thus the pipe need only connect 490 * threads. We use a mutex and a list of datagrams. */ 491 struct tube* tube = (struct tube*)calloc(1, sizeof(*tube)); 492 if(!tube) { 493 int err = errno; 494 log_err("tube_create: out of memory"); 495 errno = err; 496 return NULL; 497 } 498 tube->event = WSACreateEvent(); 499 if(tube->event == WSA_INVALID_EVENT) { 500 free(tube); 501 log_err("WSACreateEvent: %s", wsa_strerror(WSAGetLastError())); 502 } 503 if(!WSAResetEvent(tube->event)) { 504 log_err("WSAResetEvent: %s", wsa_strerror(WSAGetLastError())); 505 } 506 lock_basic_init(&tube->res_lock); 507 verbose(VERB_ALGO, "tube created"); 508 return tube; 509 } 510 511 void tube_delete(struct tube* tube) 512 { 513 if(!tube) return; 514 tube_remove_bg_listen(tube); 515 tube_remove_bg_write(tube); 516 tube_close_read(tube); 517 tube_close_write(tube); 518 if(!WSACloseEvent(tube->event)) 519 log_err("WSACloseEvent: %s", wsa_strerror(WSAGetLastError())); 520 lock_basic_destroy(&tube->res_lock); 521 verbose(VERB_ALGO, "tube deleted"); 522 free(tube); 523 } 524 525 void tube_close_read(struct tube* ATTR_UNUSED(tube)) 526 { 527 verbose(VERB_ALGO, "tube close_read"); 528 } 529 530 void tube_close_write(struct tube* ATTR_UNUSED(tube)) 531 { 532 verbose(VERB_ALGO, "tube close_write"); 533 /* wake up waiting reader with an empty queue */ 534 if(!WSASetEvent(tube->event)) { 535 log_err("WSASetEvent: %s", wsa_strerror(WSAGetLastError())); 536 } 537 } 538 539 void tube_remove_bg_listen(struct tube* tube) 540 { 541 verbose(VERB_ALGO, "tube remove_bg_listen"); 542 winsock_unregister_wsaevent(&tube->ev_listen); 543 } 544 545 void tube_remove_bg_write(struct tube* tube) 546 { 547 verbose(VERB_ALGO, "tube remove_bg_write"); 548 if(tube->res_list) { 549 struct tube_res_list* np, *p = tube->res_list; 550 tube->res_list = NULL; 551 tube->res_last = NULL; 552 while(p) { 553 np = p->next; 554 free(p->buf); 555 free(p); 556 p = np; 557 } 558 } 559 } 560 561 int tube_write_msg(struct tube* tube, uint8_t* buf, uint32_t len, 562 int ATTR_UNUSED(nonblock)) 563 { 564 uint8_t* a; 565 verbose(VERB_ALGO, "tube write_msg len %d", (int)len); 566 a = (uint8_t*)memdup(buf, len); 567 if(!a) { 568 log_err("out of memory in tube_write_msg"); 569 return 0; 570 } 571 /* always nonblocking, this pipe cannot get full */ 572 return tube_queue_item(tube, a, len); 573 } 574 575 int tube_read_msg(struct tube* tube, uint8_t** buf, uint32_t* len, 576 int nonblock) 577 { 578 struct tube_res_list* item = NULL; 579 verbose(VERB_ALGO, "tube read_msg %s", nonblock?"nonblock":"blocking"); 580 *buf = NULL; 581 if(!tube_poll(tube)) { 582 verbose(VERB_ALGO, "tube read_msg nodata"); 583 /* nothing ready right now, wait if we want to */ 584 if(nonblock) 585 return -1; /* would block waiting for items */ 586 if(!tube_wait(tube)) 587 return 0; 588 } 589 lock_basic_lock(&tube->res_lock); 590 if(tube->res_list) { 591 item = tube->res_list; 592 tube->res_list = item->next; 593 if(tube->res_last == item) { 594 /* the list is now empty */ 595 tube->res_last = NULL; 596 verbose(VERB_ALGO, "tube read_msg lastdata"); 597 if(!WSAResetEvent(tube->event)) { 598 log_err("WSAResetEvent: %s", 599 wsa_strerror(WSAGetLastError())); 600 } 601 } 602 } 603 lock_basic_unlock(&tube->res_lock); 604 if(!item) 605 return 0; /* would block waiting for items */ 606 *buf = item->buf; 607 *len = item->len; 608 free(item); 609 verbose(VERB_ALGO, "tube read_msg len %d", (int)*len); 610 return 1; 611 } 612 613 int tube_poll(struct tube* tube) 614 { 615 struct tube_res_list* item = NULL; 616 lock_basic_lock(&tube->res_lock); 617 item = tube->res_list; 618 lock_basic_unlock(&tube->res_lock); 619 if(item) 620 return 1; 621 return 0; 622 } 623 624 int tube_wait(struct tube* tube) 625 { 626 /* block on eventhandle */ 627 DWORD res = WSAWaitForMultipleEvents( 628 1 /* one event in array */, 629 &tube->event /* the event to wait for, our pipe signal */, 630 0 /* wait for all events is false */, 631 WSA_INFINITE /* wait, no timeout */, 632 0 /* we are not alertable for IO completion routines */ 633 ); 634 if(res == WSA_WAIT_TIMEOUT) { 635 return 0; 636 } 637 if(res == WSA_WAIT_IO_COMPLETION) { 638 /* a bit unexpected, since we were not alertable */ 639 return 0; 640 } 641 return 1; 642 } 643 644 int tube_read_fd(struct tube* ATTR_UNUSED(tube)) 645 { 646 /* nothing sensible on Windows */ 647 return -1; 648 } 649 650 int 651 tube_handle_listen(struct comm_point* ATTR_UNUSED(c), void* ATTR_UNUSED(arg), 652 int ATTR_UNUSED(error), struct comm_reply* ATTR_UNUSED(reply_info)) 653 { 654 log_assert(0); 655 return 0; 656 } 657 658 int 659 tube_handle_write(struct comm_point* ATTR_UNUSED(c), void* ATTR_UNUSED(arg), 660 int ATTR_UNUSED(error), struct comm_reply* ATTR_UNUSED(reply_info)) 661 { 662 log_assert(0); 663 return 0; 664 } 665 666 int tube_setup_bg_listen(struct tube* tube, struct comm_base* base, 667 tube_callback_t* cb, void* arg) 668 { 669 tube->listen_cb = cb; 670 tube->listen_arg = arg; 671 if(!comm_base_internal(base)) 672 return 1; /* ignore when no comm base - testing */ 673 return winsock_register_wsaevent(comm_base_internal(base), 674 &tube->ev_listen, tube->event, &tube_handle_signal, tube); 675 } 676 677 int tube_setup_bg_write(struct tube* ATTR_UNUSED(tube), 678 struct comm_base* ATTR_UNUSED(base)) 679 { 680 /* the queue item routine performs the signaling */ 681 return 1; 682 } 683 684 int tube_queue_item(struct tube* tube, uint8_t* msg, size_t len) 685 { 686 struct tube_res_list* item = 687 (struct tube_res_list*)malloc(sizeof(*item)); 688 verbose(VERB_ALGO, "tube queue_item len %d", (int)len); 689 if(!item) { 690 free(msg); 691 log_err("out of memory for async answer"); 692 return 0; 693 } 694 item->buf = msg; 695 item->len = len; 696 item->next = NULL; 697 lock_basic_lock(&tube->res_lock); 698 /* add at back of list, since the first one may be partially written */ 699 if(tube->res_last) 700 tube->res_last->next = item; 701 else tube->res_list = item; 702 tube->res_last = item; 703 /* signal the eventhandle */ 704 if(!WSASetEvent(tube->event)) { 705 log_err("WSASetEvent: %s", wsa_strerror(WSAGetLastError())); 706 } 707 lock_basic_unlock(&tube->res_lock); 708 return 1; 709 } 710 711 void tube_handle_signal(int ATTR_UNUSED(fd), short ATTR_UNUSED(events), 712 void* arg) 713 { 714 struct tube* tube = (struct tube*)arg; 715 uint8_t* buf; 716 uint32_t len = 0; 717 verbose(VERB_ALGO, "tube handle_signal"); 718 while(tube_poll(tube)) { 719 if(tube_read_msg(tube, &buf, &len, 1)) { 720 fptr_ok(fptr_whitelist_tube_listen(tube->listen_cb)); 721 (*tube->listen_cb)(tube, buf, len, NETEVENT_NOERROR, 722 tube->listen_arg); 723 } 724 } 725 } 726 727 #endif /* USE_WINSOCK */ 728