git.demorecorder.com Git - free-sw/xcb/libxcb/blob - src/xcb_in.c

   1 /* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
   2  *
   3  * Permission is hereby granted, free of charge, to any person obtaining a
   4  * copy of this software and associated documentation files (the "Software"),
   5  * to deal in the Software without restriction, including without limitation
   6  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   7  * and/or sell copies of the Software, and to permit persons to whom the
   8  * Software is furnished to do so, subject to the following conditions:
   9  *
  10  * The above copyright notice and this permission notice shall be included in
  11  * all copies or substantial portions of the Software.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  16  * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  17  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  18  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19  *
  20  * Except as contained in this notice, the names of the authors or their
  21  * institutions shall not be used in advertising or otherwise to promote the
  22  * sale, use or other dealings in this Software without prior written
  23  * authorization from the authors.
  24  */
  25
  26 /* Stuff that reads stuff from the server. */
  27
  28 #include <assert.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32 #include <stdio.h>
  33 #include <errno.h>
  34
  35 #include "xcb.h"
  36 #include "xcbext.h"
  37 #include "xcbint.h"
  38 #if USE_POLL
  39 #include <poll.h>
  40 #endif
  41 #ifndef _WIN32
  42 #include <sys/select.h>
  43 #include <sys/socket.h>
  44 #endif
  45
  46 #ifdef _WIN32
  47 #include "xcb_windefs.h"
  48 #endif /* _WIN32 */
  49
  50 #define XCB_ERROR 0
  51 #define XCB_REPLY 1
  52 #define XCB_XGE_EVENT 35
  53
  54 /* required for compiling for Win32 using MinGW */
  55 #ifndef MSG_WAITALL
  56 #define MSG_WAITALL 0
  57 #endif
  58
  59 struct event_list {
  60     uint64_t sequence;
  61     xcb_generic_event_t *event;
  62     struct event_list *next;
  63 };
  64
  65 struct reply_list {
  66     void *reply;
  67     struct reply_list *next;
  68 };
  69
  70 typedef struct pending_reply {
  71     uint64_t first_request;
  72     uint64_t last_request;
  73     enum workarounds workaround;
  74     int flags;
  75     struct pending_reply *next;
  76 } pending_reply;
  77
  78 typedef struct reader_list {
  79     uint64_t request;
  80     pthread_cond_t *data;
  81     struct reader_list *next;
  82 } reader_list;
  83
  84 static void remove_finished_readers(reader_list **prev_reader, uint64_t completed)
  85 {
  86     while(*prev_reader && XCB_SEQUENCE_COMPARE((*prev_reader)->request, <=, completed))
  87     {
  88         /* If you don't have what you're looking for now, you never
  89          * will. Wake up and leave me alone. */
  90         pthread_cond_signal((*prev_reader)->data);
  91         *prev_reader = (*prev_reader)->next;
  92     }
  93 }
  94
  95 static int read_packet(xcb_connection_t *c)
  96 {
  97     xcb_generic_reply_t genrep;
  98     int length = 32;
  99     int eventlength = 0; /* length after first 32 bytes for GenericEvents */
 100     void *buf;
 101     pending_reply *pend = 0;
 102     struct event_list *event;
 103
 104     /* Wait for there to be enough data for us to read a whole packet */
 105     if(c->in.queue_len < length)
 106         return 0;
 107
 108     /* Get the response type, length, and sequence number. */
 109     memcpy(&genrep, c->in.queue, sizeof(genrep));
 110
 111     /* Compute 32-bit sequence number of this packet. */
 112     if((genrep.response_type & 0x7f) != XCB_KEYMAP_NOTIFY)
 113     {
 114         uint64_t lastread = c->in.request_read;
 115         c->in.request_read = (lastread & UINT64_C(0xffffffffffff0000)) | genrep.sequence;
 116         if(XCB_SEQUENCE_COMPARE(c->in.request_read, <, lastread))
 117             c->in.request_read += 0x10000;
 118         if(XCB_SEQUENCE_COMPARE(c->in.request_read, >, c->in.request_expected))
 119             c->in.request_expected = c->in.request_read;
 120
 121         if(c->in.request_read != lastread)
 122         {
 123             if(c->in.current_reply)
 124             {
 125                 _xcb_map_put(c->in.replies, lastread, c->in.current_reply);
 126                 c->in.current_reply = 0;
 127                 c->in.current_reply_tail = &c->in.current_reply;
 128             }
 129             c->in.request_completed = c->in.event_responses_completed = c->in.request_read - 1;
 130         }
 131
 132         while(c->in.pending_replies &&
 133               c->in.pending_replies->workaround != WORKAROUND_EXTERNAL_SOCKET_OWNER &&
 134               XCB_SEQUENCE_COMPARE (c->in.pending_replies->last_request, <=, c->in.request_completed))
 135         {
 136             pending_reply *oldpend = c->in.pending_replies;
 137             c->in.pending_replies = oldpend->next;
 138             if(!oldpend->next)
 139                 c->in.pending_replies_tail = &c->in.pending_replies;
 140             free(oldpend);
 141         }
 142
 143         if(genrep.response_type == XCB_ERROR)
 144             c->in.request_completed = c->in.event_responses_completed = c->in.request_read;
 145         else if(genrep.response_type == XCB_REPLY)
 146             c->in.event_responses_completed = c->in.request_read;
 147
 148         remove_finished_readers(&c->in.readers, c->in.request_completed);
 149         remove_finished_readers(&c->in.event_readers, c->in.event_responses_completed);
 150     }
 151
 152     if(genrep.response_type == XCB_ERROR || genrep.response_type == XCB_REPLY)
 153     {
 154         pend = c->in.pending_replies;
 155         if(pend &&
 156            !(XCB_SEQUENCE_COMPARE(pend->first_request, <=, c->in.request_read) &&
 157              (pend->workaround == WORKAROUND_EXTERNAL_SOCKET_OWNER ||
 158               XCB_SEQUENCE_COMPARE(c->in.request_read, <=, pend->last_request))))
 159             pend = 0;
 160     }
 161
 162     /* For reply packets, check that the entire packet is available. */
 163     if(genrep.response_type == XCB_REPLY)
 164     {
 165         if(pend && pend->workaround == WORKAROUND_GLX_GET_FB_CONFIGS_BUG)
 166         {
 167             uint32_t *p = (uint32_t *) c->in.queue;
 168             genrep.length = p[2] * p[3] * 2;
 169         }
 170         length += genrep.length * 4;
 171     }
 172
 173     /* XGE events may have sizes > 32 */
 174     if ((genrep.response_type & 0x7f) == XCB_XGE_EVENT)
 175         eventlength = genrep.length * 4;
 176
 177     buf = malloc(length + eventlength +
 178             (genrep.response_type == XCB_REPLY ? 0 : sizeof(uint32_t)));
 179     if(!buf)
 180     {
 181         _xcb_conn_shutdown(c);
 182         return 0;
 183     }
 184
 185     if(_xcb_in_read_block(c, buf, length) <= 0)
 186     {
 187         free(buf);
 188         return 0;
 189     }
 190
 191     /* pull in XGE event data if available, append after event struct */
 192     if (eventlength)
 193     {
 194         if(_xcb_in_read_block(c, &((xcb_generic_event_t*)buf)[1], eventlength) <= 0)
 195         {
 196             free(buf);
 197             return 0;
 198         }
 199     }
 200
 201     if(pend && (pend->flags & XCB_REQUEST_DISCARD_REPLY))
 202     {
 203         free(buf);
 204         return 1;
 205     }
 206
 207     if(genrep.response_type != XCB_REPLY)
 208         ((xcb_generic_event_t *) buf)->full_sequence = c->in.request_read;
 209
 210     /* reply, or checked error */
 211     if( genrep.response_type == XCB_REPLY ||
 212        (genrep.response_type == XCB_ERROR && pend && (pend->flags & XCB_REQUEST_CHECKED)))
 213     {
 214         struct reply_list *cur = malloc(sizeof(struct reply_list));
 215         if(!cur)
 216         {
 217             _xcb_conn_shutdown(c);
 218             free(buf);
 219             return 0;
 220         }
 221         cur->reply = buf;
 222         cur->next = 0;
 223         *c->in.current_reply_tail = cur;
 224         c->in.current_reply_tail = &cur->next;
 225         if(c->in.readers && c->in.readers->request == c->in.request_read)
 226             pthread_cond_signal(c->in.readers->data);
 227         return 1;
 228     }
 229
 230     /* event, or unchecked error */
 231     event = malloc(sizeof(struct event_list));
 232     if(!event)
 233     {
 234         _xcb_conn_shutdown(c);
 235         free(buf);
 236         return 0;
 237     }
 238     event->sequence = c->in.request_read;
 239     event->event = buf;
 240     event->next = 0;
 241     *c->in.events_tail = event;
 242     c->in.events_tail = &event->next;
 243     if(c->in.event_readers)
 244         pthread_cond_signal(c->in.event_readers->data);
 245     else
 246         pthread_cond_signal(&c->in.event_cond);
 247     return 1; /* I have something for you... */
 248 }
 249
 250 static xcb_generic_event_t *get_event(xcb_connection_t *c)
 251 {
 252     struct event_list *cur = c->in.events;
 253     xcb_generic_event_t *ret;
 254     if(!c->in.events)
 255         return 0;
 256     ret = cur->event;
 257     c->in.events = cur->next;
 258     if(!cur->next)
 259         c->in.events_tail = &c->in.events;
 260     free(cur);
 261     return ret;
 262 }
 263
 264 static void free_reply_list(struct reply_list *head)
 265 {
 266     while(head)
 267     {
 268         struct reply_list *cur = head;
 269         head = cur->next;
 270         free(cur->reply);
 271         free(cur);
 272     }
 273 }
 274
 275 static int read_block(const int fd, void *buf, const ssize_t len)
 276 {
 277     int done = 0;
 278     while(done < len)
 279     {
 280         int ret = recv(fd, ((char *) buf) + done, len - done,MSG_WAITALL);
 281         if(ret > 0)
 282             done += ret;
 283 #ifndef _WIN32
 284         if(ret < 0 && errno == EAGAIN)
 285 #else
 286         if(ret == SOCKET_ERROR && WSAGetLastError() == WSAEWOULDBLOCK)
 287 #endif /* !_Win32 */
 288         {
 289 #if USE_POLL
 290             struct pollfd pfd;
 291             pfd.fd = fd;
 292             pfd.events = POLLIN;
 293             pfd.revents = 0;
 294             do {
 295                 ret = poll(&pfd, 1, -1);
 296             } while (ret == -1 && errno == EINTR);
 297 #else
 298             fd_set fds;
 299             FD_ZERO(&fds);
 300             FD_SET(fd, &fds);
 301
 302             /* Initializing errno here makes sure that for Win32 this loop will execute only once */
 303             errno = 0;
 304             do {
 305                 ret = select(fd + 1, &fds, 0, 0, 0);
 306             } while (ret == -1 && errno == EINTR);
 307 #endif /* USE_POLL */
 308         }
 309         if(ret <= 0)
 310             return ret;
 311     }
 312     return len;
 313 }
 314
 315 static int poll_for_reply(xcb_connection_t *c, uint64_t request, void **reply, xcb_generic_error_t **error)
 316 {
 317     struct reply_list *head;
 318
 319     /* If an error occurred when issuing the request, fail immediately. */
 320     if(!request)
 321         head = 0;
 322     /* We've read requests past the one we want, so if it has replies we have
 323      * them all and they're in the replies map. */
 324     else if(XCB_SEQUENCE_COMPARE(request, <, c->in.request_read))
 325     {
 326         head = _xcb_map_remove(c->in.replies, request);
 327         if(head && head->next)
 328             _xcb_map_put(c->in.replies, request, head->next);
 329     }
 330     /* We're currently processing the responses to the request we want, and we
 331      * have a reply ready to return. So just return it without blocking. */
 332     else if(request == c->in.request_read && c->in.current_reply)
 333     {
 334         head = c->in.current_reply;
 335         c->in.current_reply = head->next;
 336         if(!head->next)
 337             c->in.current_reply_tail = &c->in.current_reply;
 338     }
 339     /* We know this request can't have any more replies, and we've already
 340      * established it doesn't have a reply now. Don't bother blocking. */
 341     else if(request == c->in.request_completed)
 342         head = 0;
 343     /* We may have more replies on the way for this request: block until we're
 344      * sure. */
 345     else
 346         return 0;
 347
 348     if(error)
 349         *error = 0;
 350     *reply = 0;
 351
 352     if(head)
 353     {
 354         if(((xcb_generic_reply_t *) head->reply)->response_type == XCB_ERROR)
 355         {
 356             if(error)
 357                 *error = head->reply;
 358             else
 359                 free(head->reply);
 360         }
 361         else
 362             *reply = head->reply;
 363
 364         free(head);
 365     }
 366
 367     return 1;
 368 }
 369
 370 static void insert_reader(reader_list **prev_reader, reader_list *reader, uint64_t request, pthread_cond_t *cond)
 371 {
 372     while(*prev_reader && XCB_SEQUENCE_COMPARE((*prev_reader)->request, <=, request))
 373         prev_reader = &(*prev_reader)->next;
 374     reader->request = request;
 375     reader->data = cond;
 376     reader->next = *prev_reader;
 377     *prev_reader = reader;
 378 }
 379
 380 static void remove_reader(reader_list **prev_reader, reader_list *reader)
 381 {
 382     while(*prev_reader && XCB_SEQUENCE_COMPARE((*prev_reader)->request, <=, reader->request))
 383         if(*prev_reader == reader)
 384         {
 385             *prev_reader = (*prev_reader)->next;
 386             break;
 387         }
 388 }
 389
 390 static void *wait_for_reply(xcb_connection_t *c, uint64_t request, xcb_generic_error_t **e)
 391 {
 392     void *ret = 0;
 393
 394     /* If this request has not been written yet, write it. */
 395     if(c->out.return_socket || _xcb_out_flush_to(c, request))
 396     {
 397         pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
 398         reader_list reader;
 399
 400         insert_reader(&c->in.readers, &reader, request, &cond);
 401
 402         while(!poll_for_reply(c, request, &ret, e))
 403             if(!_xcb_conn_wait(c, &cond, 0, 0))
 404                 break;
 405
 406         remove_reader(&c->in.readers, &reader);
 407         pthread_cond_destroy(&cond);
 408     }
 409
 410     _xcb_in_wake_up_next_reader(c);
 411     return ret;
 412 }
 413
 414 static uint64_t widen(xcb_connection_t *c, unsigned int request)
 415 {
 416     uint64_t widened_request = (c->out.request & UINT64_C(0xffffffff00000000)) | request;
 417     if(widened_request > c->out.request)
 418         widened_request -= UINT64_C(1) << 32;
 419     return widened_request;
 420 }
 421
 422 /* Public interface */
 423
 424 void *xcb_wait_for_reply(xcb_connection_t *c, unsigned int request, xcb_generic_error_t **e)
 425 {
 426     void *ret;
 427     if(e)
 428         *e = 0;
 429     if(c->has_error)
 430         return 0;
 431
 432     pthread_mutex_lock(&c->iolock);
 433     ret = wait_for_reply(c, widen(c, request), e);
 434     pthread_mutex_unlock(&c->iolock);
 435     return ret;
 436 }
 437
 438 static void insert_pending_discard(xcb_connection_t *c, pending_reply **prev_next, uint64_t seq)
 439 {
 440     pending_reply *pend;
 441     pend = malloc(sizeof(*pend));
 442     if(!pend)
 443     {
 444         _xcb_conn_shutdown(c);
 445         return;
 446     }
 447
 448     pend->first_request = seq;
 449     pend->last_request = seq;
 450     pend->workaround = 0;
 451     pend->flags = XCB_REQUEST_DISCARD_REPLY;
 452     pend->next = *prev_next;
 453     *prev_next = pend;
 454
 455     if(!pend->next)
 456         c->in.pending_replies_tail = &pend->next;
 457 }
 458
 459 static void discard_reply(xcb_connection_t *c, uint64_t request)
 460 {
 461     void *reply;
 462     pending_reply **prev_pend;
 463
 464     /* Free any replies or errors that we've already read. Stop if
 465      * xcb_wait_for_reply would block or we've run out of replies. */
 466     while(poll_for_reply(c, request, &reply, 0) && reply)
 467         free(reply);
 468
 469     /* If we've proven there are no more responses coming, we're done. */
 470     if(XCB_SEQUENCE_COMPARE(request, <=, c->in.request_completed))
 471         return;
 472
 473     /* Walk the list of pending requests. Mark the first match for deletion. */
 474     for(prev_pend = &c->in.pending_replies; *prev_pend; prev_pend = &(*prev_pend)->next)
 475     {
 476         if(XCB_SEQUENCE_COMPARE((*prev_pend)->first_request, >, request))
 477             break;
 478
 479         if((*prev_pend)->first_request == request)
 480         {
 481             /* Pending reply found. Mark for discard: */
 482             (*prev_pend)->flags |= XCB_REQUEST_DISCARD_REPLY;
 483             return;
 484         }
 485     }
 486
 487     /* Pending reply not found (likely due to _unchecked request). Create one: */
 488     insert_pending_discard(c, prev_pend, request);
 489 }
 490
 491 void xcb_discard_reply(xcb_connection_t *c, unsigned int sequence)
 492 {
 493     if(c->has_error)
 494         return;
 495
 496     /* If an error occurred when issuing the request, fail immediately. */
 497     if(!sequence)
 498         return;
 499
 500     pthread_mutex_lock(&c->iolock);
 501     discard_reply(c, widen(c, sequence));
 502     pthread_mutex_unlock(&c->iolock);
 503 }
 504
 505 int xcb_poll_for_reply(xcb_connection_t *c, unsigned int request, void **reply, xcb_generic_error_t **error)
 506 {
 507     int ret;
 508     if(c->has_error)
 509     {
 510         *reply = 0;
 511         if(error)
 512             *error = 0;
 513         return 1; /* would not block */
 514     }
 515     assert(reply != 0);
 516     pthread_mutex_lock(&c->iolock);
 517     ret = poll_for_reply(c, widen(c, request), reply, error);
 518     pthread_mutex_unlock(&c->iolock);
 519     return ret;
 520 }
 521
 522 xcb_generic_event_t *xcb_wait_for_event(xcb_connection_t *c)
 523 {
 524     xcb_generic_event_t *ret;
 525     if(c->has_error)
 526         return 0;
 527     pthread_mutex_lock(&c->iolock);
 528     /* get_event returns 0 on empty list. */
 529     while(!(ret = get_event(c)))
 530         if(!_xcb_conn_wait(c, &c->in.event_cond, 0, 0))
 531             break;
 532
 533     _xcb_in_wake_up_next_reader(c);
 534     pthread_mutex_unlock(&c->iolock);
 535     return ret;
 536 }
 537
 538 xcb_generic_event_t *xcb_poll_for_event(xcb_connection_t *c)
 539 {
 540     xcb_generic_event_t *ret = 0;
 541     if(!c->has_error)
 542     {
 543         pthread_mutex_lock(&c->iolock);
 544         /* FIXME: follow X meets Z architecture changes. */
 545         ret = get_event(c);
 546         if(!ret && _xcb_in_read(c)) /* _xcb_in_read shuts down the connection on error */
 547             ret = get_event(c);
 548         pthread_mutex_unlock(&c->iolock);
 549     }
 550     return ret;
 551 }
 552
 553 static xcb_generic_event_t *get_event_until(xcb_connection_t *c, uint64_t request)
 554 {
 555     if(c->in.events && XCB_SEQUENCE_COMPARE(c->in.events->sequence, <=, request))
 556         return get_event(c);
 557     return 0;
 558 }
 559
 560 xcb_generic_event_t *xcb_wait_for_event_until(xcb_connection_t *c, unsigned int request)
 561 {
 562     pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
 563     reader_list reader;
 564     xcb_generic_event_t *ret;
 565     if(c->has_error)
 566         return 0;
 567     pthread_mutex_lock(&c->iolock);
 568
 569     insert_reader(&c->in.event_readers, &reader, widen(c, request), &cond);
 570
 571     while(!(ret = get_event_until(c, reader.request)) && XCB_SEQUENCE_COMPARE(c->in.event_responses_completed, <, reader.request))
 572         if(!_xcb_conn_wait(c, &cond, 0, 0))
 573             break;
 574
 575     remove_reader(&c->in.event_readers, &reader);
 576     pthread_cond_destroy(&cond);
 577     _xcb_in_wake_up_next_reader(c);
 578     pthread_mutex_unlock(&c->iolock);
 579     return ret;
 580 }
 581
 582 xcb_generic_error_t *xcb_request_check(xcb_connection_t *c, xcb_void_cookie_t cookie)
 583 {
 584     uint64_t request;
 585     xcb_generic_error_t *ret = 0;
 586     void *reply;
 587     if(c->has_error)
 588         return 0;
 589     pthread_mutex_lock(&c->iolock);
 590     request = widen(c, cookie.sequence);
 591     if(XCB_SEQUENCE_COMPARE(request, >=, c->in.request_expected)
 592        && XCB_SEQUENCE_COMPARE(request, >, c->in.request_completed))
 593     {
 594         _xcb_out_send_sync(c);
 595         _xcb_out_flush_to(c, c->out.request);
 596     }
 597     reply = wait_for_reply(c, request, &ret);
 598     assert(!reply);
 599     pthread_mutex_unlock(&c->iolock);
 600     return ret;
 601 }
 602
 603 /* Private interface */
 604
 605 int _xcb_in_init(_xcb_in *in)
 606 {
 607     if(pthread_cond_init(&in->event_cond, 0))
 608         return 0;
 609     in->reading = 0;
 610
 611     in->queue_len = 0;
 612
 613     in->request_read = 0;
 614     in->request_completed = 0;
 615
 616     in->replies = _xcb_map_new();
 617     if(!in->replies)
 618         return 0;
 619
 620     in->current_reply_tail = &in->current_reply;
 621     in->events_tail = &in->events;
 622     in->pending_replies_tail = &in->pending_replies;
 623
 624     return 1;
 625 }
 626
 627 void _xcb_in_destroy(_xcb_in *in)
 628 {
 629     pthread_cond_destroy(&in->event_cond);
 630     free_reply_list(in->current_reply);
 631     _xcb_map_delete(in->replies, (void (*)(void *)) free_reply_list);
 632     while(in->events)
 633     {
 634         struct event_list *e = in->events;
 635         in->events = e->next;
 636         free(e->event);
 637         free(e);
 638     }
 639     while(in->pending_replies)
 640     {
 641         pending_reply *pend = in->pending_replies;
 642         in->pending_replies = pend->next;
 643         free(pend);
 644     }
 645 }
 646
 647 void _xcb_in_wake_up_next_reader(xcb_connection_t *c)
 648 {
 649     int pthreadret;
 650     if(c->in.readers)
 651         pthreadret = pthread_cond_signal(c->in.readers->data);
 652     else if(c->in.event_readers)
 653         pthreadret = pthread_cond_signal(c->in.event_readers->data);
 654     else
 655         pthreadret = pthread_cond_signal(&c->in.event_cond);
 656     assert(pthreadret == 0);
 657 }
 658
 659 int _xcb_in_expect_reply(xcb_connection_t *c, uint64_t request, enum workarounds workaround, int flags)
 660 {
 661     pending_reply *pend = malloc(sizeof(pending_reply));
 662     assert(workaround != WORKAROUND_NONE || flags != 0);
 663     if(!pend)
 664     {
 665         _xcb_conn_shutdown(c);
 666         return 0;
 667     }
 668     pend->first_request = pend->last_request = request;
 669     pend->workaround = workaround;
 670     pend->flags = flags;
 671     pend->next = 0;
 672     *c->in.pending_replies_tail = pend;
 673     c->in.pending_replies_tail = &pend->next;
 674     return 1;
 675 }
 676
 677 void _xcb_in_replies_done(xcb_connection_t *c)
 678 {
 679     struct pending_reply *pend;
 680     if (c->in.pending_replies_tail != &c->in.pending_replies)
 681     {
 682         pend = container_of(c->in.pending_replies_tail, struct pending_reply, next);
 683         if(pend->workaround == WORKAROUND_EXTERNAL_SOCKET_OWNER)
 684         {
 685             pend->last_request = c->out.request;
 686             pend->workaround = WORKAROUND_NONE;
 687         }
 688     }
 689 }
 690
 691 int _xcb_in_read(xcb_connection_t *c)
 692 {
 693     int n = recv(c->fd, c->in.queue + c->in.queue_len, sizeof(c->in.queue) - c->in.queue_len,MSG_WAITALL);
 694     if(n > 0)
 695         c->in.queue_len += n;
 696     while(read_packet(c))
 697         /* empty */;
 698 #ifndef _WIN32
 699     if((n > 0) || (n < 0 && errno == EAGAIN))
 700 #else
 701     if((n > 0) || (n < 0 && WSAGetLastError() == WSAEWOULDBLOCK))
 702 #endif /* !_WIN32 */
 703         return 1;
 704     _xcb_conn_shutdown(c);
 705     return 0;
 706 }
 707
 708 int _xcb_in_read_block(xcb_connection_t *c, void *buf, int len)
 709 {
 710     int done = c->in.queue_len;
 711     if(len < done)
 712         done = len;
 713
 714     memcpy(buf, c->in.queue, done);
 715     c->in.queue_len -= done;
 716     memmove(c->in.queue, c->in.queue + done, c->in.queue_len);
 717
 718     if(len > done)
 719     {
 720         int ret = read_block(c->fd, (char *) buf + done, len - done);
 721         if(ret <= 0)
 722         {
 723             _xcb_conn_shutdown(c);
 724             return ret;
 725         }
 726     }
 727
 728     return len;
 729 }