337 lines
8.5 KiB
C
337 lines
8.5 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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/* Connection management: the core of XCB. */
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#include <assert.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <netinet/in.h>
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#include <sys/select.h>
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#include <fcntl.h>
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#include <errno.h>
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#include "xcb.h"
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#include "xcbint.h"
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typedef struct {
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uint8_t status;
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uint8_t pad0[5];
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uint16_t length;
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} xcb_setup_generic_t;
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static const int error_connection = 1;
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static int set_fd_flags(const int fd)
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{
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int flags = fcntl(fd, F_GETFL, 0);
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if(flags == -1)
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return 0;
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flags |= O_NONBLOCK;
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if(fcntl(fd, F_SETFL, flags) == -1)
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return 0;
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if(fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
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return 0;
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return 1;
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}
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static int _xcb_xlib_init(_xcb_xlib *xlib)
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{
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xlib->lock = 0;
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pthread_cond_init(&xlib->cond, 0);
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return 1;
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}
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static void _xcb_xlib_destroy(_xcb_xlib *xlib)
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{
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pthread_cond_destroy(&xlib->cond);
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}
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static int write_setup(xcb_connection_t *c, xcb_auth_info_t *auth_info)
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{
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static const char pad[3];
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xcb_setup_request_t out;
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struct iovec parts[6];
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int count = 0;
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int endian = 0x01020304;
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int ret;
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memset(&out, 0, sizeof(out));
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/* B = 0x42 = MSB first, l = 0x6c = LSB first */
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if(htonl(endian) == endian)
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out.byte_order = 0x42;
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else
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out.byte_order = 0x6c;
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out.protocol_major_version = X_PROTOCOL;
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out.protocol_minor_version = X_PROTOCOL_REVISION;
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out.authorization_protocol_name_len = 0;
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out.authorization_protocol_data_len = 0;
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parts[count].iov_len = sizeof(xcb_setup_request_t);
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parts[count++].iov_base = &out;
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parts[count].iov_len = XCB_PAD(sizeof(xcb_setup_request_t));
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parts[count++].iov_base = (char *) pad;
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if(auth_info)
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{
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parts[count].iov_len = out.authorization_protocol_name_len = auth_info->namelen;
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parts[count++].iov_base = auth_info->name;
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parts[count].iov_len = XCB_PAD(out.authorization_protocol_name_len);
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parts[count++].iov_base = (char *) pad;
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parts[count].iov_len = out.authorization_protocol_data_len = auth_info->datalen;
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parts[count++].iov_base = auth_info->data;
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parts[count].iov_len = XCB_PAD(out.authorization_protocol_data_len);
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parts[count++].iov_base = (char *) pad;
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}
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assert(count <= sizeof(parts) / sizeof(*parts));
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_xcb_lock_io(c);
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{
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struct iovec *parts_ptr = parts;
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ret = _xcb_out_send(c, &parts_ptr, &count);
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}
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_xcb_unlock_io(c);
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return ret;
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}
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static int read_setup(xcb_connection_t *c)
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{
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/* Read the server response */
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c->setup = malloc(sizeof(xcb_setup_generic_t));
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if(!c->setup)
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return 0;
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if(_xcb_in_read_block(c, c->setup, sizeof(xcb_setup_generic_t)) != sizeof(xcb_setup_generic_t))
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return 0;
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{
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void *tmp = realloc(c->setup, c->setup->length * 4 + sizeof(xcb_setup_generic_t));
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if(!tmp)
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return 0;
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c->setup = tmp;
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}
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if(_xcb_in_read_block(c, (char *) c->setup + sizeof(xcb_setup_generic_t), c->setup->length * 4) <= 0)
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return 0;
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/* 0 = failed, 2 = authenticate, 1 = success */
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switch(c->setup->status)
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{
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case 0: /* failed */
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{
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xcb_setup_failed_t *setup = (xcb_setup_failed_t *) c->setup;
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write(STDERR_FILENO, xcb_setup_failed_reason(setup), xcb_setup_failed_reason_length(setup));
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return 0;
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}
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case 2: /* authenticate */
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{
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xcb_setup_authenticate_t *setup = (xcb_setup_authenticate_t *) c->setup;
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write(STDERR_FILENO, xcb_setup_authenticate_reason(setup), xcb_setup_authenticate_reason_length(setup));
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return 0;
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}
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}
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return 1;
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}
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/* precondition: there must be something for us to write. */
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static int write_vec(xcb_connection_t *c, struct iovec **vector, int *count)
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{
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int n;
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assert(!c->out.queue_len);
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n = writev(c->fd, *vector, *count);
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if(n < 0 && errno == EAGAIN)
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return 1;
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if(n <= 0)
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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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for(; *count; --*count, ++*vector)
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{
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int cur = (*vector)->iov_len;
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if(cur > n)
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cur = n;
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(*vector)->iov_len -= cur;
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(*vector)->iov_base = (char *) (*vector)->iov_base + cur;
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n -= cur;
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if((*vector)->iov_len)
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break;
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}
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if(!*count)
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*vector = 0;
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assert(n == 0);
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return 1;
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}
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/* Public interface */
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const xcb_setup_t *xcb_get_setup(xcb_connection_t *c)
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{
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if(c->has_error)
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return 0;
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/* doesn't need locking because it's never written to. */
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return c->setup;
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}
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int xcb_get_file_descriptor(xcb_connection_t *c)
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{
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if(c->has_error)
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return -1;
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/* doesn't need locking because it's never written to. */
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return c->fd;
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}
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int xcb_connection_has_error(xcb_connection_t *c)
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{
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/* doesn't need locking because it's read and written atomically. */
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return c->has_error;
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}
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xcb_connection_t *xcb_connect_to_fd(int fd, xcb_auth_info_t *auth_info)
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{
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xcb_connection_t* c;
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c = calloc(1, sizeof(xcb_connection_t));
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if(!c)
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return (xcb_connection_t *) &error_connection;
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c->fd = fd;
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if(!(
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set_fd_flags(fd) &&
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pthread_mutex_init(&c->iolock, 0) == 0 &&
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_xcb_xlib_init(&c->xlib) &&
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_xcb_in_init(&c->in) &&
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_xcb_out_init(&c->out) &&
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write_setup(c, auth_info) &&
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read_setup(c) &&
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_xcb_ext_init(c) &&
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_xcb_xid_init(c)
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))
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{
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xcb_disconnect(c);
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return (xcb_connection_t *) &error_connection;
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}
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return c;
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}
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void xcb_disconnect(xcb_connection_t *c)
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{
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if(c->has_error)
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return;
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free(c->setup);
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close(c->fd);
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pthread_mutex_destroy(&c->iolock);
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_xcb_xlib_destroy(&c->xlib);
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_xcb_in_destroy(&c->in);
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_xcb_out_destroy(&c->out);
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_xcb_ext_destroy(c);
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_xcb_xid_destroy(c);
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free(c);
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}
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/* Private interface */
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void _xcb_conn_shutdown(xcb_connection_t *c)
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{
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c->has_error = 1;
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}
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void _xcb_lock_io(xcb_connection_t *c)
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{
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pthread_mutex_lock(&c->iolock);
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while(c->xlib.lock)
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{
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if(pthread_equal(c->xlib.thread, pthread_self()))
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break;
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pthread_cond_wait(&c->xlib.cond, &c->iolock);
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}
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}
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void _xcb_unlock_io(xcb_connection_t *c)
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{
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pthread_mutex_unlock(&c->iolock);
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}
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int _xcb_conn_wait(xcb_connection_t *c, pthread_cond_t *cond, struct iovec **vector, int *count)
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{
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int ret;
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fd_set rfds, wfds;
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/* If the thing I should be doing is already being done, wait for it. */
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if(count ? c->out.writing : c->in.reading)
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{
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pthread_cond_wait(cond, &c->iolock);
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return 1;
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}
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FD_ZERO(&rfds);
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FD_SET(c->fd, &rfds);
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++c->in.reading;
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FD_ZERO(&wfds);
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if(count)
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{
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FD_SET(c->fd, &wfds);
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++c->out.writing;
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}
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_xcb_unlock_io(c);
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do {
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ret = select(c->fd + 1, &rfds, &wfds, 0, 0);
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} while (ret == -1 && errno == EINTR);
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if (ret < 0)
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{
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_xcb_conn_shutdown(c);
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ret = 0;
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}
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_xcb_lock_io(c);
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if(ret)
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{
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if(FD_ISSET(c->fd, &rfds))
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ret = ret && _xcb_in_read(c);
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if(FD_ISSET(c->fd, &wfds))
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ret = ret && write_vec(c, vector, count);
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}
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if(count)
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--c->out.writing;
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--c->in.reading;
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return ret;
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}
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