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 25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE 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#include "util/ub_event.h" 48#ifdef HAVE_POLL_H 49#include <poll.h> 50#endif 51 52#ifndef USE_WINSOCK 53/* on unix */ 54 55#ifndef HAVE_SOCKETPAIR 56/** no socketpair() available, like on Minix 3.1.7, use pipe */ 57#define socketpair(f, t, p, sv) pipe(sv) 58#endif /* HAVE_SOCKETPAIR */ 59 60struct tube* tube_create(void) 61{ 62 struct tube* tube = (struct tube*)calloc(1, sizeof(*tube)); 63 int sv[2]; 64 if(!tube) { 65 int err = errno; 66 log_err("tube_create: out of memory"); 67 errno = err; 68 return NULL; 69 } 70 tube->sr = -1; 71 tube->sw = -1; 72 if(socketpair(AF_UNIX, SOCK_STREAM, 0, sv) == -1) { 73 int err = errno; 74 log_err("socketpair: %s", strerror(errno)); 75 free(tube); 76 errno = err; 77 return NULL; 78 } 79 tube->sr = sv[0]; 80 tube->sw = sv[1]; 81 if(!fd_set_nonblock(tube->sr) || !fd_set_nonblock(tube->sw)) { 82 int err = errno; 83 log_err("tube: cannot set nonblocking"); 84 tube_delete(tube); 85 errno = err; 86 return NULL; 87 } 88 return tube; 89} 90 91void tube_delete(struct tube* tube) 92{ 93 if(!tube) return; 94 tube_remove_bg_listen(tube); 95 tube_remove_bg_write(tube); 96 /* close fds after deleting commpoints, to be sure. 97 * Also epoll does not like closing fd before event_del */ 98 tube_close_read(tube); 99 tube_close_write(tube); 100 free(tube); 101} 102 103void tube_close_read(struct tube* tube) 104{ 105 if(tube->sr != -1) { 106 close(tube->sr); 107 tube->sr = -1; 108 } 109} 110 111void tube_close_write(struct tube* tube) 112{ 113 if(tube->sw != -1) { 114 close(tube->sw); 115 tube->sw = -1; 116 } 117} 118 119void tube_remove_bg_listen(struct tube* tube) 120{ 121 if(tube->listen_com) { 122 comm_point_delete(tube->listen_com); 123 tube->listen_com = NULL; 124 } 125 free(tube->cmd_msg); 126 tube->cmd_msg = NULL; 127} 128 129void tube_remove_bg_write(struct tube* tube) 130{ 131 if(tube->res_com) { 132 comm_point_delete(tube->res_com); 133 tube->res_com = NULL; 134 } 135 if(tube->res_list) { 136 struct tube_res_list* np, *p = tube->res_list; 137 tube->res_list = NULL; 138 tube->res_last = NULL; 139 while(p) { 140 np = p->next; 141 free(p->buf); 142 free(p); 143 p = np; 144 } 145 } 146} 147 148int 149tube_handle_listen(struct comm_point* c, void* arg, int error, 150 struct comm_reply* ATTR_UNUSED(reply_info)) 151{ 152 struct tube* tube = (struct tube*)arg; 153 ssize_t r; 154 if(error != NETEVENT_NOERROR) { 155 fptr_ok(fptr_whitelist_tube_listen(tube->listen_cb)); 156 (*tube->listen_cb)(tube, NULL, 0, error, tube->listen_arg); 157 return 0; 158 } 159 160 if(tube->cmd_read < sizeof(tube->cmd_len)) { 161 /* complete reading the length of control msg */ 162 r = read(c->fd, ((uint8_t*)&tube->cmd_len) + tube->cmd_read, 163 sizeof(tube->cmd_len) - tube->cmd_read); 164 if(r==0) { 165 /* error has happened or */ 166 /* parent closed pipe, must have exited somehow */ 167 fptr_ok(fptr_whitelist_tube_listen(tube->listen_cb)); 168 (*tube->listen_cb)(tube, NULL, 0, NETEVENT_CLOSED, 169 tube->listen_arg); 170 return 0; 171 } 172 if(r==-1) { 173 if(errno != EAGAIN && errno != EINTR) { 174 log_err("rpipe error: %s", strerror(errno)); 175 } 176 /* nothing to read now, try later */ 177 return 0; 178 } 179 tube->cmd_read += r; 180 if(tube->cmd_read < sizeof(tube->cmd_len)) { 181 /* not complete, try later */ 182 return 0; 183 } 184 tube->cmd_msg = (uint8_t*)calloc(1, tube->cmd_len); 185 if(!tube->cmd_msg) { 186 log_err("malloc failure"); 187 tube->cmd_read = 0; 188 return 0; 189 } 190 } 191 /* cmd_len has been read, read remainder */ 192 r = read(c->fd, tube->cmd_msg+tube->cmd_read-sizeof(tube->cmd_len), 193 tube->cmd_len - (tube->cmd_read - sizeof(tube->cmd_len))); 194 if(r==0) { 195 /* error has happened or */ 196 /* parent closed pipe, must have exited somehow */ 197 fptr_ok(fptr_whitelist_tube_listen(tube->listen_cb)); 198 (*tube->listen_cb)(tube, NULL, 0, NETEVENT_CLOSED, 199 tube->listen_arg); 200 return 0; 201 } 202 if(r==-1) { 203 /* nothing to read now, try later */ 204 if(errno != EAGAIN && errno != EINTR) { 205 log_err("rpipe error: %s", strerror(errno)); 206 } 207 return 0; 208 } 209 tube->cmd_read += r; 210 if(tube->cmd_read < sizeof(tube->cmd_len) + tube->cmd_len) { 211 /* not complete, try later */ 212 return 0; 213 } 214 tube->cmd_read = 0; 215 216 fptr_ok(fptr_whitelist_tube_listen(tube->listen_cb)); 217 (*tube->listen_cb)(tube, tube->cmd_msg, tube->cmd_len, 218 NETEVENT_NOERROR, tube->listen_arg); 219 /* also frees the buf */ 220 tube->cmd_msg = NULL; 221 return 0; 222} 223 224int 225tube_handle_write(struct comm_point* c, void* arg, int error, 226 struct comm_reply* ATTR_UNUSED(reply_info)) 227{ 228 struct tube* tube = (struct tube*)arg; 229 struct tube_res_list* item = tube->res_list; 230 ssize_t r; 231 if(error != NETEVENT_NOERROR) { 232 log_err("tube_handle_write net error %d", error); 233 return 0; 234 } 235 236 if(!item) { 237 comm_point_stop_listening(c); 238 return 0; 239 } 240 241 if(tube->res_write < sizeof(item->len)) { 242 r = write(c->fd, ((uint8_t*)&item->len) + tube->res_write, 243 sizeof(item->len) - tube->res_write); 244 if(r == -1) { 245 if(errno != EAGAIN && errno != EINTR) { 246 log_err("wpipe error: %s", strerror(errno)); 247 } 248 return 0; /* try again later */ 249 } 250 if(r == 0) { 251 /* error on pipe, must have exited somehow */ 252 /* cannot signal this to pipe user */ 253 return 0; 254 } 255 tube->res_write += r; 256 if(tube->res_write < sizeof(item->len)) 257 return 0; 258 } 259 r = write(c->fd, item->buf + tube->res_write - sizeof(item->len), 260 item->len - (tube->res_write - sizeof(item->len))); 261 if(r == -1) { 262 if(errno != EAGAIN && errno != EINTR) { 263 log_err("wpipe error: %s", strerror(errno)); 264 } 265 return 0; /* try again later */ 266 } 267 if(r == 0) { 268 /* error on pipe, must have exited somehow */ 269 /* cannot signal this to pipe user */ 270 return 0; 271 } 272 tube->res_write += r; 273 if(tube->res_write < sizeof(item->len) + item->len) 274 return 0; 275 /* done this result, remove it */ 276 free(item->buf); 277 item->buf = NULL; 278 tube->res_list = tube->res_list->next; 279 free(item); 280 if(!tube->res_list) { 281 tube->res_last = NULL; 282 comm_point_stop_listening(c); 283 } 284 tube->res_write = 0; 285 return 0; 286} 287 288int tube_write_msg(struct tube* tube, uint8_t* buf, uint32_t len, 289 int nonblock) 290{ 291 ssize_t r, d; 292 int fd = tube->sw; 293 294 /* test */ 295 if(nonblock) { 296 r = write(fd, &len, sizeof(len)); 297 if(r == -1) { 298 if(errno==EINTR || errno==EAGAIN) 299 return -1; 300 log_err("tube msg write failed: %s", strerror(errno)); 301 return -1; /* can still continue, perhaps */ 302 } 303 } else r = 0; 304 if(!fd_set_block(fd)) 305 return 0; 306 /* write remainder */ 307 d = r; 308 while(d != (ssize_t)sizeof(len)) { 309 if((r=write(fd, ((char*)&len)+d, sizeof(len)-d)) == -1) { 310 if(errno == EAGAIN) 311 continue; /* temporarily unavail: try again*/ 312 log_err("tube msg write failed: %s", strerror(errno)); 313 (void)fd_set_nonblock(fd); 314 return 0; 315 } 316 d += r; 317 } 318 d = 0; 319 while(d != (ssize_t)len) { 320 if((r=write(fd, buf+d, len-d)) == -1) { 321 if(errno == EAGAIN) 322 continue; /* temporarily unavail: try again*/ 323 log_err("tube msg write failed: %s", strerror(errno)); 324 (void)fd_set_nonblock(fd); 325 return 0; 326 } 327 d += r; 328 } 329 if(!fd_set_nonblock(fd)) 330 return 0; 331 return 1; 332} 333 334int tube_read_msg(struct tube* tube, uint8_t** buf, uint32_t* len, 335 int nonblock) 336{ 337 ssize_t r, d; 338 int fd = tube->sr; 339 340 /* test */ 341 *len = 0; 342 if(nonblock) { 343 r = read(fd, len, sizeof(*len)); 344 if(r == -1) { 345 if(errno==EINTR || errno==EAGAIN) 346 return -1; 347 log_err("tube msg read failed: %s", strerror(errno)); 348 return -1; /* we can still continue, perhaps */ 349 } 350 if(r == 0) /* EOF */ 351 return 0; 352 } else r = 0; 353 if(!fd_set_block(fd)) 354 return 0; 355 /* read remainder */ 356 d = r; 357 while(d != (ssize_t)sizeof(*len)) { 358 if((r=read(fd, ((char*)len)+d, sizeof(*len)-d)) == -1) { 359 log_err("tube msg read failed: %s", strerror(errno)); 360 (void)fd_set_nonblock(fd); 361 return 0; 362 } 363 if(r == 0) /* EOF */ { 364 (void)fd_set_nonblock(fd); 365 return 0; 366 } 367 d += r; 368 } 369 if (*len >= 65536*2) { 370 log_err("tube msg length %u is too big", (unsigned)*len); 371 (void)fd_set_nonblock(fd); 372 return 0; 373 } 374 *buf = (uint8_t*)malloc(*len); 375 if(!*buf) { 376 log_err("tube read out of memory"); 377 (void)fd_set_nonblock(fd); 378 return 0; 379 } 380 d = 0; 381 while(d < (ssize_t)*len) { 382 if((r=read(fd, (*buf)+d, (size_t)((ssize_t)*len)-d)) == -1) { 383 log_err("tube msg read failed: %s", strerror(errno)); 384 (void)fd_set_nonblock(fd); 385 free(*buf); 386 return 0; 387 } 388 if(r == 0) { /* EOF */ 389 (void)fd_set_nonblock(fd); 390 free(*buf); 391 return 0; 392 } 393 d += r; 394 } 395 if(!fd_set_nonblock(fd)) { 396 free(*buf); 397 return 0; 398 } 399 return 1; 400} 401 402/** perform poll() on the fd */ 403static int 404pollit(int fd, struct timeval* t) 405{ 406 struct pollfd fds; 407 int pret; 408 int msec = -1; 409 memset(&fds, 0, sizeof(fds)); 410 fds.fd = fd; 411 fds.events = POLLIN | POLLERR | POLLHUP; 412#ifndef S_SPLINT_S 413 if(t) 414 msec = t->tv_sec*1000 + t->tv_usec/1000; 415#endif 416 417 pret = poll(&fds, 1, msec); 418 419 if(pret == -1) 420 return 0; 421 if(pret != 0) 422 return 1; 423 return 0; 424} 425 426int tube_poll(struct tube* tube) 427{ 428 struct timeval t; 429 memset(&t, 0, sizeof(t)); 430 return pollit(tube->sr, &t); 431} 432 433int tube_wait(struct tube* tube) 434{ 435 return pollit(tube->sr, NULL); 436} 437 438int tube_wait_timeout(struct tube* tube, int msec) 439{ 440 int ret = 0; 441 442 while(1) { 443 struct pollfd fds; 444 memset(&fds, 0, sizeof(fds)); 445 446 fds.fd = tube->sr; 447 fds.events = POLLIN | POLLERR | POLLHUP; 448 ret = poll(&fds, 1, msec); 449 450 if(ret == -1) { 451 if(errno == EAGAIN || errno == EINTR) 452 continue; 453 return -1; 454 } 455 break; 456 } 457 458 if(ret != 0) 459 return 1; 460 return 0; 461} 462 463int tube_read_fd(struct tube* tube) 464{ 465 return tube->sr; 466} 467 468int tube_setup_bg_listen(struct tube* tube, struct comm_base* base, 469 tube_callback_type* cb, void* arg) 470{ 471 tube->listen_cb = cb; 472 tube->listen_arg = arg; 473 if(!(tube->listen_com = comm_point_create_raw(base, tube->sr, 474 0, tube_handle_listen, tube))) { 475 int err = errno; 476 log_err("tube_setup_bg_l: commpoint creation failed"); 477 errno = err; 478 return 0; 479 } 480 return 1; 481} 482 483int tube_setup_bg_write(struct tube* tube, struct comm_base* base) 484{ 485 if(!(tube->res_com = comm_point_create_raw(base, tube->sw, 486 1, tube_handle_write, tube))) { 487 int err = errno; 488 log_err("tube_setup_bg_w: commpoint creation failed"); 489 errno = err; 490 return 0; 491 } 492 return 1; 493} 494 495int tube_queue_item(struct tube* tube, uint8_t* msg, size_t len) 496{ 497 struct tube_res_list* item; 498 if(!tube || !tube->res_com) return 0; 499 item = (struct tube_res_list*)malloc(sizeof(*item)); 500 if(!item) { 501 free(msg); 502 log_err("out of memory for async answer"); 503 return 0; 504 } 505 item->buf = msg; 506 item->len = len; 507 item->next = NULL; 508 /* add at back of list, since the first one may be partially written */ 509 if(tube->res_last) 510 tube->res_last->next = item; 511 else tube->res_list = item; 512 tube->res_last = item; 513 if(tube->res_list == tube->res_last) { 514 /* first added item, start the write process */ 515 comm_point_start_listening(tube->res_com, -1, -1); 516 } 517 return 1; 518} 519 520void tube_handle_signal(int ATTR_UNUSED(fd), short ATTR_UNUSED(events), 521 void* ATTR_UNUSED(arg)) 522{ 523 log_assert(0); 524} 525 526#else /* USE_WINSOCK */ 527/* on windows */ 528 529 530struct tube* tube_create(void) 531{ 532 /* windows does not have forks like unix, so we only support 533 * threads on windows. And thus the pipe need only connect 534 * threads. We use a mutex and a list of datagrams. */ 535 struct tube* tube = (struct tube*)calloc(1, sizeof(*tube)); 536 if(!tube) { 537 int err = errno; 538 log_err("tube_create: out of memory"); 539 errno = err; 540 return NULL; 541 } 542 tube->event = WSACreateEvent(); 543 if(tube->event == WSA_INVALID_EVENT) { 544 free(tube); 545 log_err("WSACreateEvent: %s", wsa_strerror(WSAGetLastError())); 546 return NULL; 547 } 548 if(!WSAResetEvent(tube->event)) { 549 log_err("WSAResetEvent: %s", wsa_strerror(WSAGetLastError())); 550 } 551 lock_basic_init(&tube->res_lock); 552 verbose(VERB_ALGO, "tube created"); 553 return tube; 554} 555 556void tube_delete(struct tube* tube) 557{ 558 if(!tube) return; 559 tube_remove_bg_listen(tube); 560 tube_remove_bg_write(tube); 561 tube_close_read(tube); 562 tube_close_write(tube); 563 if(!WSACloseEvent(tube->event)) 564 log_err("WSACloseEvent: %s", wsa_strerror(WSAGetLastError())); 565 lock_basic_destroy(&tube->res_lock); 566 verbose(VERB_ALGO, "tube deleted"); 567 free(tube); 568} 569 570void tube_close_read(struct tube* ATTR_UNUSED(tube)) 571{ 572 verbose(VERB_ALGO, "tube close_read"); 573} 574 575void tube_close_write(struct tube* ATTR_UNUSED(tube)) 576{ 577 verbose(VERB_ALGO, "tube close_write"); 578 /* wake up waiting reader with an empty queue */ 579 if(!WSASetEvent(tube->event)) { 580 log_err("WSASetEvent: %s", wsa_strerror(WSAGetLastError())); 581 } 582} 583 584void tube_remove_bg_listen(struct tube* tube) 585{ 586 verbose(VERB_ALGO, "tube remove_bg_listen"); 587 ub_winsock_unregister_wsaevent(tube->ev_listen); 588} 589 590void tube_remove_bg_write(struct tube* tube) 591{ 592 verbose(VERB_ALGO, "tube remove_bg_write"); 593 if(tube->res_list) { 594 struct tube_res_list* np, *p = tube->res_list; 595 tube->res_list = NULL; 596 tube->res_last = NULL; 597 while(p) { 598 np = p->next; 599 free(p->buf); 600 free(p); 601 p = np; 602 } 603 } 604} 605 606int tube_write_msg(struct tube* tube, uint8_t* buf, uint32_t len, 607 int ATTR_UNUSED(nonblock)) 608{ 609 uint8_t* a; 610 verbose(VERB_ALGO, "tube write_msg len %d", (int)len); 611 a = (uint8_t*)memdup(buf, len); 612 if(!a) { 613 log_err("out of memory in tube_write_msg"); 614 return 0; 615 } 616 /* always nonblocking, this pipe cannot get full */ 617 return tube_queue_item(tube, a, len); 618} 619 620int tube_read_msg(struct tube* tube, uint8_t** buf, uint32_t* len, 621 int nonblock) 622{ 623 struct tube_res_list* item = NULL; 624 verbose(VERB_ALGO, "tube read_msg %s", nonblock?"nonblock":"blocking"); 625 *buf = NULL; 626 if(!tube_poll(tube)) { 627 verbose(VERB_ALGO, "tube read_msg nodata"); 628 /* nothing ready right now, wait if we want to */ 629 if(nonblock) 630 return -1; /* would block waiting for items */ 631 if(!tube_wait(tube)) 632 return 0; 633 } 634 lock_basic_lock(&tube->res_lock); 635 if(tube->res_list) { 636 item = tube->res_list; 637 tube->res_list = item->next; 638 if(tube->res_last == item) { 639 /* the list is now empty */ 640 tube->res_last = NULL; 641 verbose(VERB_ALGO, "tube read_msg lastdata"); 642 if(!WSAResetEvent(tube->event)) { 643 log_err("WSAResetEvent: %s", 644 wsa_strerror(WSAGetLastError())); 645 } 646 } 647 } 648 lock_basic_unlock(&tube->res_lock); 649 if(!item) 650 return 0; /* would block waiting for items */ 651 *buf = item->buf; 652 *len = item->len; 653 free(item); 654 verbose(VERB_ALGO, "tube read_msg len %d", (int)*len); 655 return 1; 656} 657 658int tube_poll(struct tube* tube) 659{ 660 struct tube_res_list* item = NULL; 661 lock_basic_lock(&tube->res_lock); 662 item = tube->res_list; 663 lock_basic_unlock(&tube->res_lock); 664 if(item) 665 return 1; 666 return 0; 667} 668 669int tube_wait(struct tube* tube) 670{ 671 /* block on eventhandle */ 672 DWORD res = WSAWaitForMultipleEvents( 673 1 /* one event in array */, 674 &tube->event /* the event to wait for, our pipe signal */, 675 0 /* wait for all events is false */, 676 WSA_INFINITE /* wait, no timeout */, 677 0 /* we are not alertable for IO completion routines */ 678 ); 679 if(res == WSA_WAIT_TIMEOUT) { 680 return 0; 681 } 682 if(res == WSA_WAIT_IO_COMPLETION) { 683 /* a bit unexpected, since we were not alertable */ 684 return 0; 685 } 686 return 1; 687} 688 689int tube_wait_timeout(struct tube* tube, int msec) 690{ 691 /* block on eventhandle */ 692 DWORD res = WSAWaitForMultipleEvents( 693 1 /* one event in array */, 694 &tube->event /* the event to wait for, our pipe signal */, 695 0 /* wait for all events is false */, 696 msec /* wait for timeout */, 697 0 /* we are not alertable for IO completion routines */ 698 ); 699 if(res == WSA_WAIT_TIMEOUT) { 700 return 0; 701 } 702 if(res == WSA_WAIT_IO_COMPLETION) { 703 /* a bit unexpected, since we were not alertable */ 704 return -1; 705 } 706 return 1; 707} 708 709int tube_read_fd(struct tube* ATTR_UNUSED(tube)) 710{ 711 /* nothing sensible on Windows */ 712 return -1; 713} 714 715int 716tube_handle_listen(struct comm_point* ATTR_UNUSED(c), void* ATTR_UNUSED(arg), 717 int ATTR_UNUSED(error), struct comm_reply* ATTR_UNUSED(reply_info)) 718{ 719 log_assert(0); 720 return 0; 721} 722 723int 724tube_handle_write(struct comm_point* ATTR_UNUSED(c), void* ATTR_UNUSED(arg), 725 int ATTR_UNUSED(error), struct comm_reply* ATTR_UNUSED(reply_info)) 726{ 727 log_assert(0); 728 return 0; 729} 730 731int tube_setup_bg_listen(struct tube* tube, struct comm_base* base, 732 tube_callback_type* cb, void* arg) 733{ 734 tube->listen_cb = cb; 735 tube->listen_arg = arg; 736 if(!comm_base_internal(base)) 737 return 1; /* ignore when no comm base - testing */ 738 tube->ev_listen = ub_winsock_register_wsaevent( 739 comm_base_internal(base), tube->event, &tube_handle_signal, tube); 740 return tube->ev_listen ? 1 : 0; 741} 742 743int tube_setup_bg_write(struct tube* ATTR_UNUSED(tube), 744 struct comm_base* ATTR_UNUSED(base)) 745{ 746 /* the queue item routine performs the signaling */ 747 return 1; 748} 749 750int tube_queue_item(struct tube* tube, uint8_t* msg, size_t len) 751{ 752 struct tube_res_list* item; 753 if(!tube) return 0; 754 item = (struct tube_res_list*)malloc(sizeof(*item)); 755 verbose(VERB_ALGO, "tube queue_item len %d", (int)len); 756 if(!item) { 757 free(msg); 758 log_err("out of memory for async answer"); 759 return 0; 760 } 761 item->buf = msg; 762 item->len = len; 763 item->next = NULL; 764 lock_basic_lock(&tube->res_lock); 765 /* add at back of list, since the first one may be partially written */ 766 if(tube->res_last) 767 tube->res_last->next = item; 768 else tube->res_list = item; 769 tube->res_last = item; 770 /* signal the eventhandle */ 771 if(!WSASetEvent(tube->event)) { 772 log_err("WSASetEvent: %s", wsa_strerror(WSAGetLastError())); 773 } 774 lock_basic_unlock(&tube->res_lock); 775 return 1; 776} 777 778void tube_handle_signal(int ATTR_UNUSED(fd), short ATTR_UNUSED(events), 779 void* arg) 780{ 781 struct tube* tube = (struct tube*)arg; 782 uint8_t* buf; 783 uint32_t len = 0; 784 verbose(VERB_ALGO, "tube handle_signal"); 785 while(tube_poll(tube)) { 786 if(tube_read_msg(tube, &buf, &len, 1)) { 787 fptr_ok(fptr_whitelist_tube_listen(tube->listen_cb)); 788 (*tube->listen_cb)(tube, buf, len, NETEVENT_NOERROR, 789 tube->listen_arg); 790 } 791 } 792} 793 794#endif /* USE_WINSOCK */ 795