591 lines
16 KiB
C
591 lines
16 KiB
C
/* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the names of the authors or their
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* institutions shall not be used in advertising or otherwise to promote the
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* sale, use or other dealings in this Software without prior written
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* authorization from the authors.
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*/
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/* Stuff that reads stuff from the server. */
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#include <assert.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include "xcb.h"
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#include "xcbext.h"
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#include "xcbint.h"
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#if USE_POLL
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#include <poll.h>
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#else
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#include <sys/select.h>
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#endif
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#define XCB_ERROR 0
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#define XCB_REPLY 1
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#define XCB_XGE_EVENT 35
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struct event_list {
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xcb_generic_event_t *event;
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struct event_list *next;
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};
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struct reply_list {
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void *reply;
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struct reply_list *next;
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};
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typedef struct pending_reply {
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uint64_t first_request;
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uint64_t last_request;
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enum workarounds workaround;
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int flags;
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struct pending_reply *next;
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} pending_reply;
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typedef struct reader_list {
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unsigned int request;
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pthread_cond_t *data;
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struct reader_list *next;
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} reader_list;
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static void wake_up_next_reader(xcb_connection_t *c)
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{
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int pthreadret;
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if(c->in.readers)
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pthreadret = pthread_cond_signal(c->in.readers->data);
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else
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pthreadret = pthread_cond_signal(&c->in.event_cond);
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assert(pthreadret == 0);
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}
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static int read_packet(xcb_connection_t *c)
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{
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xcb_generic_reply_t genrep;
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int length = 32;
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int eventlength = 0; /* length after first 32 bytes for GenericEvents */
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void *buf;
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pending_reply *pend = 0;
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struct event_list *event;
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/* Wait for there to be enough data for us to read a whole packet */
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if(c->in.queue_len < length)
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return 0;
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/* Get the response type, length, and sequence number. */
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memcpy(&genrep, c->in.queue, sizeof(genrep));
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/* Compute 32-bit sequence number of this packet. */
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if((genrep.response_type & 0x7f) != XCB_KEYMAP_NOTIFY)
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{
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uint64_t lastread = c->in.request_read;
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c->in.request_read = (lastread & UINT64_C(0xffffffffffff0000)) | genrep.sequence;
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if(XCB_SEQUENCE_COMPARE(c->in.request_read, <, lastread))
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c->in.request_read += 0x10000;
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if(XCB_SEQUENCE_COMPARE(c->in.request_read, >, c->in.request_expected))
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c->in.request_expected = c->in.request_read;
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if(c->in.request_read != lastread)
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{
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if(c->in.current_reply)
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{
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_xcb_map_put(c->in.replies, lastread, c->in.current_reply);
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c->in.current_reply = 0;
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c->in.current_reply_tail = &c->in.current_reply;
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}
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c->in.request_completed = c->in.request_read - 1;
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}
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while(c->in.pending_replies &&
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c->in.pending_replies->workaround != WORKAROUND_EXTERNAL_SOCKET_OWNER &&
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XCB_SEQUENCE_COMPARE (c->in.pending_replies->last_request, <=, c->in.request_completed))
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{
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pending_reply *oldpend = c->in.pending_replies;
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c->in.pending_replies = oldpend->next;
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if(!oldpend->next)
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c->in.pending_replies_tail = &c->in.pending_replies;
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free(oldpend);
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}
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if(genrep.response_type == XCB_ERROR)
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c->in.request_completed = c->in.request_read;
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}
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if(genrep.response_type == XCB_ERROR || genrep.response_type == XCB_REPLY)
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{
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pend = c->in.pending_replies;
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if(pend &&
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!(XCB_SEQUENCE_COMPARE(pend->first_request, <=, c->in.request_read) &&
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(pend->workaround == WORKAROUND_EXTERNAL_SOCKET_OWNER ||
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XCB_SEQUENCE_COMPARE(c->in.request_read, <=, pend->last_request))))
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pend = 0;
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}
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/* For reply packets, check that the entire packet is available. */
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if(genrep.response_type == XCB_REPLY)
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{
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if(pend && pend->workaround == WORKAROUND_GLX_GET_FB_CONFIGS_BUG)
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{
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uint32_t *p = (uint32_t *) c->in.queue;
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genrep.length = p[2] * p[3] * 2;
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}
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length += genrep.length * 4;
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}
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/* XGE events may have sizes > 32 */
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if (genrep.response_type == XCB_XGE_EVENT)
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{
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eventlength = ((xcb_ge_event_t*)&genrep)->length * 4;
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}
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buf = malloc(length + eventlength +
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(genrep.response_type == XCB_REPLY ? 0 : sizeof(uint32_t)));
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if(!buf)
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{
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_xcb_conn_shutdown(c);
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return 0;
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}
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if(_xcb_in_read_block(c, buf, length) <= 0)
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{
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free(buf);
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return 0;
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}
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/* pull in XGE event data if available, append after event struct */
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if (eventlength)
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{
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if(_xcb_in_read_block(c, &((xcb_generic_event_t*)buf)[1], eventlength) <= 0)
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{
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free(buf);
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return 0;
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}
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}
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if(pend && (pend->flags & XCB_REQUEST_DISCARD_REPLY))
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{
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free(buf);
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return 1;
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}
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if(genrep.response_type != XCB_REPLY)
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((xcb_generic_event_t *) buf)->full_sequence = c->in.request_read;
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/* reply, or checked error */
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if( genrep.response_type == XCB_REPLY ||
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(genrep.response_type == XCB_ERROR && pend && (pend->flags & XCB_REQUEST_CHECKED)))
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{
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reader_list *reader;
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struct reply_list *cur = malloc(sizeof(struct reply_list));
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if(!cur)
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{
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_xcb_conn_shutdown(c);
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free(buf);
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return 0;
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}
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cur->reply = buf;
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cur->next = 0;
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*c->in.current_reply_tail = cur;
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c->in.current_reply_tail = &cur->next;
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for(reader = c->in.readers;
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reader &&
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XCB_SEQUENCE_COMPARE_32(reader->request, <=, c->in.request_read);
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reader = reader->next)
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{
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if(XCB_SEQUENCE_COMPARE_32(reader->request, ==, c->in.request_read))
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{
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pthread_cond_signal(reader->data);
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break;
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}
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}
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return 1;
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}
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/* event, or unchecked error */
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event = malloc(sizeof(struct event_list));
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if(!event)
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{
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_xcb_conn_shutdown(c);
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free(buf);
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return 0;
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}
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event->event = buf;
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event->next = 0;
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*c->in.events_tail = event;
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c->in.events_tail = &event->next;
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pthread_cond_signal(&c->in.event_cond);
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return 1; /* I have something for you... */
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}
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static xcb_generic_event_t *get_event(xcb_connection_t *c)
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{
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struct event_list *cur = c->in.events;
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xcb_generic_event_t *ret;
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if(!c->in.events)
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return 0;
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ret = cur->event;
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c->in.events = cur->next;
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if(!cur->next)
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c->in.events_tail = &c->in.events;
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free(cur);
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return ret;
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}
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static void free_reply_list(struct reply_list *head)
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{
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while(head)
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{
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struct reply_list *cur = head;
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head = cur->next;
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free(cur->reply);
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free(cur);
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}
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}
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static int read_block(const int fd, void *buf, const ssize_t len)
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{
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int done = 0;
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while(done < len)
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{
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int ret = read(fd, ((char *) buf) + done, len - done);
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if(ret > 0)
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done += ret;
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if(ret < 0 && errno == EAGAIN)
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{
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#if USE_POLL
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struct pollfd pfd;
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pfd.fd = fd;
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pfd.events = POLLIN;
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pfd.revents = 0;
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do {
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ret = poll(&pfd, 1, -1);
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} while (ret == -1 && errno == EINTR);
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#else
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fd_set fds;
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FD_ZERO(&fds);
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FD_SET(fd, &fds);
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do {
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ret = select(fd + 1, &fds, 0, 0, 0);
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} while (ret == -1 && errno == EINTR);
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#endif
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}
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if(ret <= 0)
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return ret;
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}
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return len;
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}
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static int poll_for_reply(xcb_connection_t *c, unsigned int request, void **reply, xcb_generic_error_t **error)
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{
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struct reply_list *head;
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/* If an error occurred when issuing the request, fail immediately. */
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if(!request)
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head = 0;
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/* We've read requests past the one we want, so if it has replies we have
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* them all and they're in the replies map. */
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else if(XCB_SEQUENCE_COMPARE_32(request, <, c->in.request_read))
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{
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head = _xcb_map_remove(c->in.replies, request);
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if(head && head->next)
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_xcb_map_put(c->in.replies, request, head->next);
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}
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/* We're currently processing the responses to the request we want, and we
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* have a reply ready to return. So just return it without blocking. */
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else if(XCB_SEQUENCE_COMPARE_32(request, ==, c->in.request_read) && c->in.current_reply)
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{
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head = c->in.current_reply;
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c->in.current_reply = head->next;
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if(!head->next)
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c->in.current_reply_tail = &c->in.current_reply;
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}
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/* We know this request can't have any more replies, and we've already
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* established it doesn't have a reply now. Don't bother blocking. */
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else if(XCB_SEQUENCE_COMPARE_32(request, ==, c->in.request_completed))
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head = 0;
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/* We may have more replies on the way for this request: block until we're
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* sure. */
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else
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return 0;
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if(error)
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*error = 0;
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*reply = 0;
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if(head)
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{
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if(((xcb_generic_reply_t *) head->reply)->response_type == XCB_ERROR)
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{
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if(error)
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*error = head->reply;
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else
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free(head->reply);
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}
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else
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*reply = head->reply;
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free(head);
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}
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return 1;
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}
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/* Public interface */
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void *xcb_wait_for_reply(xcb_connection_t *c, unsigned int request, xcb_generic_error_t **e)
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{
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uint64_t widened_request;
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void *ret = 0;
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if(e)
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*e = 0;
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if(c->has_error)
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return 0;
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pthread_mutex_lock(&c->iolock);
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widened_request = (c->out.request & UINT64_C(0xffffffff00000000)) | request;
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if(widened_request > c->out.request)
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widened_request -= UINT64_C(1) << 32;
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/* If this request has not been written yet, write it. */
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if(c->out.return_socket || _xcb_out_flush_to(c, widened_request))
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{
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pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
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reader_list reader;
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reader_list **prev_reader;
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for(prev_reader = &c->in.readers;
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*prev_reader &&
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XCB_SEQUENCE_COMPARE_32((*prev_reader)->request, <=, request);
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prev_reader = &(*prev_reader)->next)
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{
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/* empty */;
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}
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reader.request = request;
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reader.data = &cond;
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reader.next = *prev_reader;
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*prev_reader = &reader;
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while(!poll_for_reply(c, request, &ret, e))
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if(!_xcb_conn_wait(c, &cond, 0, 0))
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break;
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for(prev_reader = &c->in.readers;
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*prev_reader &&
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XCB_SEQUENCE_COMPARE_32((*prev_reader)->request, <=, request);
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prev_reader = &(*prev_reader)->next)
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{
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if(*prev_reader == &reader)
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{
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*prev_reader = (*prev_reader)->next;
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break;
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}
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}
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pthread_cond_destroy(&cond);
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}
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wake_up_next_reader(c);
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pthread_mutex_unlock(&c->iolock);
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return ret;
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}
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int xcb_poll_for_reply(xcb_connection_t *c, unsigned int request, void **reply, xcb_generic_error_t **error)
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{
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int ret;
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if(c->has_error)
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{
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*reply = 0;
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if(error)
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*error = 0;
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return 1; /* would not block */
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}
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assert(reply != 0);
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pthread_mutex_lock(&c->iolock);
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ret = poll_for_reply(c, request, reply, error);
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pthread_mutex_unlock(&c->iolock);
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return ret;
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}
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xcb_generic_event_t *xcb_wait_for_event(xcb_connection_t *c)
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{
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xcb_generic_event_t *ret;
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if(c->has_error)
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return 0;
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pthread_mutex_lock(&c->iolock);
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/* get_event returns 0 on empty list. */
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while(!(ret = get_event(c)))
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if(!_xcb_conn_wait(c, &c->in.event_cond, 0, 0))
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break;
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wake_up_next_reader(c);
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pthread_mutex_unlock(&c->iolock);
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return ret;
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}
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xcb_generic_event_t *xcb_poll_for_event(xcb_connection_t *c)
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{
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xcb_generic_event_t *ret = 0;
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if(!c->has_error)
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{
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pthread_mutex_lock(&c->iolock);
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/* FIXME: follow X meets Z architecture changes. */
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ret = get_event(c);
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if(!ret && _xcb_in_read(c)) /* _xcb_in_read shuts down the connection on error */
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ret = get_event(c);
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pthread_mutex_unlock(&c->iolock);
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}
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return ret;
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}
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xcb_generic_error_t *xcb_request_check(xcb_connection_t *c, xcb_void_cookie_t cookie)
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{
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/* FIXME: this could hold the lock to avoid syncing unnecessarily, but
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* that would require factoring the locking out of xcb_get_input_focus,
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* xcb_get_input_focus_reply, and xcb_wait_for_reply. */
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xcb_generic_error_t *ret;
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void *reply;
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if(c->has_error)
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return 0;
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if(XCB_SEQUENCE_COMPARE_32(cookie.sequence,>,c->in.request_expected)
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&& XCB_SEQUENCE_COMPARE_32(cookie.sequence,>,c->in.request_completed))
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{
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free(xcb_get_input_focus_reply(c, xcb_get_input_focus(c), &ret));
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assert(!ret);
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}
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reply = xcb_wait_for_reply(c, cookie.sequence, &ret);
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assert(!reply);
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return ret;
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}
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/* Private interface */
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int _xcb_in_init(_xcb_in *in)
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{
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if(pthread_cond_init(&in->event_cond, 0))
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return 0;
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in->reading = 0;
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in->queue_len = 0;
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in->request_read = 0;
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in->request_completed = 0;
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in->replies = _xcb_map_new();
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if(!in->replies)
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return 0;
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in->current_reply_tail = &in->current_reply;
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in->events_tail = &in->events;
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in->pending_replies_tail = &in->pending_replies;
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return 1;
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}
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void _xcb_in_destroy(_xcb_in *in)
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{
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pthread_cond_destroy(&in->event_cond);
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free_reply_list(in->current_reply);
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_xcb_map_delete(in->replies, (void (*)(void *)) free_reply_list);
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while(in->events)
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{
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struct event_list *e = in->events;
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in->events = e->next;
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free(e->event);
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free(e);
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}
|
|
while(in->pending_replies)
|
|
{
|
|
pending_reply *pend = in->pending_replies;
|
|
in->pending_replies = pend->next;
|
|
free(pend);
|
|
}
|
|
}
|
|
|
|
int _xcb_in_expect_reply(xcb_connection_t *c, uint64_t request, enum workarounds workaround, int flags)
|
|
{
|
|
pending_reply *pend = malloc(sizeof(pending_reply));
|
|
assert(workaround != WORKAROUND_NONE || flags != 0);
|
|
if(!pend)
|
|
{
|
|
_xcb_conn_shutdown(c);
|
|
return 0;
|
|
}
|
|
pend->first_request = pend->last_request = request;
|
|
pend->workaround = workaround;
|
|
pend->flags = flags;
|
|
pend->next = 0;
|
|
*c->in.pending_replies_tail = pend;
|
|
c->in.pending_replies_tail = &pend->next;
|
|
return 1;
|
|
}
|
|
|
|
void _xcb_in_replies_done(xcb_connection_t *c)
|
|
{
|
|
struct pending_reply *pend;
|
|
if (c->in.pending_replies_tail != &c->in.pending_replies)
|
|
{
|
|
pend = container_of(c->in.pending_replies_tail, struct pending_reply, next);
|
|
if(pend->workaround == WORKAROUND_EXTERNAL_SOCKET_OWNER)
|
|
{
|
|
pend->last_request = c->out.request;
|
|
pend->workaround = WORKAROUND_NONE;
|
|
}
|
|
}
|
|
}
|
|
|
|
int _xcb_in_read(xcb_connection_t *c)
|
|
{
|
|
int n = read(c->fd, c->in.queue + c->in.queue_len, sizeof(c->in.queue) - c->in.queue_len);
|
|
if(n > 0)
|
|
c->in.queue_len += n;
|
|
while(read_packet(c))
|
|
/* empty */;
|
|
if((n > 0) || (n < 0 && errno == EAGAIN))
|
|
return 1;
|
|
_xcb_conn_shutdown(c);
|
|
return 0;
|
|
}
|
|
|
|
int _xcb_in_read_block(xcb_connection_t *c, void *buf, int len)
|
|
{
|
|
int done = c->in.queue_len;
|
|
if(len < done)
|
|
done = len;
|
|
|
|
memcpy(buf, c->in.queue, done);
|
|
c->in.queue_len -= done;
|
|
memmove(c->in.queue, c->in.queue + done, c->in.queue_len);
|
|
|
|
if(len > done)
|
|
{
|
|
int ret = read_block(c->fd, (char *) buf + done, len - done);
|
|
if(ret <= 0)
|
|
{
|
|
_xcb_conn_shutdown(c);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return len;
|
|
}
|