1 /* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
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:
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
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.
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.
26 /* Connection management: the core of XCB. */
33 #include <netinet/in.h>
42 #include <sys/select.h>
45 /* SHUT_RDWR is fairly recent and is not available on all platforms */
46 #if !defined(SHUT_RDWR)
54 } xcb_setup_generic_t;
56 static const int error_connection = 1;
58 static int set_fd_flags(const int fd)
60 int flags = fcntl(fd, F_GETFL, 0);
64 if(fcntl(fd, F_SETFL, flags) == -1)
66 if(fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
71 static int write_setup(xcb_connection_t *c, xcb_auth_info_t *auth_info)
73 static const char pad[3];
74 xcb_setup_request_t out;
75 struct iovec parts[6];
77 static const uint32_t endian = 0x01020304;
80 memset(&out, 0, sizeof(out));
82 /* B = 0x42 = MSB first, l = 0x6c = LSB first */
83 if(htonl(endian) == endian)
84 out.byte_order = 0x42;
86 out.byte_order = 0x6c;
87 out.protocol_major_version = X_PROTOCOL;
88 out.protocol_minor_version = X_PROTOCOL_REVISION;
89 out.authorization_protocol_name_len = 0;
90 out.authorization_protocol_data_len = 0;
91 parts[count].iov_len = sizeof(xcb_setup_request_t);
92 parts[count++].iov_base = &out;
93 parts[count].iov_len = XCB_PAD(sizeof(xcb_setup_request_t));
94 parts[count++].iov_base = (char *) pad;
98 parts[count].iov_len = out.authorization_protocol_name_len = auth_info->namelen;
99 parts[count++].iov_base = auth_info->name;
100 parts[count].iov_len = XCB_PAD(out.authorization_protocol_name_len);
101 parts[count++].iov_base = (char *) pad;
102 parts[count].iov_len = out.authorization_protocol_data_len = auth_info->datalen;
103 parts[count++].iov_base = auth_info->data;
104 parts[count].iov_len = XCB_PAD(out.authorization_protocol_data_len);
105 parts[count++].iov_base = (char *) pad;
107 assert(count <= (int) (sizeof(parts) / sizeof(*parts)));
109 pthread_mutex_lock(&c->iolock);
110 ret = _xcb_out_send(c, parts, count);
111 pthread_mutex_unlock(&c->iolock);
115 static int read_setup(xcb_connection_t *c)
117 /* Read the server response */
118 c->setup = malloc(sizeof(xcb_setup_generic_t));
122 if(_xcb_in_read_block(c, c->setup, sizeof(xcb_setup_generic_t)) != sizeof(xcb_setup_generic_t))
126 void *tmp = realloc(c->setup, c->setup->length * 4 + sizeof(xcb_setup_generic_t));
132 if(_xcb_in_read_block(c, (char *) c->setup + sizeof(xcb_setup_generic_t), c->setup->length * 4) <= 0)
135 /* 0 = failed, 2 = authenticate, 1 = success */
136 switch(c->setup->status)
140 xcb_setup_failed_t *setup = (xcb_setup_failed_t *) c->setup;
141 write(STDERR_FILENO, xcb_setup_failed_reason(setup), xcb_setup_failed_reason_length(setup));
145 case 2: /* authenticate */
147 xcb_setup_authenticate_t *setup = (xcb_setup_authenticate_t *) c->setup;
148 write(STDERR_FILENO, xcb_setup_authenticate_reason(setup), xcb_setup_authenticate_reason_length(setup));
156 /* precondition: there must be something for us to write. */
157 static int write_vec(xcb_connection_t *c, struct iovec **vector, int *count)
160 assert(!c->out.queue_len);
161 n = writev(c->fd, *vector, *count);
162 if(n < 0 && errno == EAGAIN)
166 _xcb_conn_shutdown(c);
170 for(; *count; --*count, ++*vector)
172 int cur = (*vector)->iov_len;
175 (*vector)->iov_len -= cur;
176 (*vector)->iov_base = (char *) (*vector)->iov_base + cur;
178 if((*vector)->iov_len)
187 /* Public interface */
189 const xcb_setup_t *xcb_get_setup(xcb_connection_t *c)
193 /* doesn't need locking because it's never written to. */
197 int xcb_get_file_descriptor(xcb_connection_t *c)
201 /* doesn't need locking because it's never written to. */
205 int xcb_connection_has_error(xcb_connection_t *c)
207 /* doesn't need locking because it's read and written atomically. */
211 xcb_connection_t *xcb_connect_to_fd(int fd, xcb_auth_info_t *auth_info)
216 if(fd >= FD_SETSIZE) /* would overflow in FD_SET */
219 return (xcb_connection_t *) &error_connection;
223 c = calloc(1, sizeof(xcb_connection_t));
226 return (xcb_connection_t *) &error_connection;
233 pthread_mutex_init(&c->iolock, 0) == 0 &&
234 _xcb_in_init(&c->in) &&
235 _xcb_out_init(&c->out) &&
236 write_setup(c, auth_info) &&
243 return (xcb_connection_t *) &error_connection;
249 void xcb_disconnect(xcb_connection_t *c)
256 /* disallow further sends and receives */
257 shutdown(c->fd, SHUT_RDWR);
260 pthread_mutex_destroy(&c->iolock);
261 _xcb_in_destroy(&c->in);
262 _xcb_out_destroy(&c->out);
270 /* Private interface */
272 void _xcb_conn_shutdown(xcb_connection_t *c)
277 int _xcb_conn_wait(xcb_connection_t *c, pthread_cond_t *cond, struct iovec **vector, int *count)
286 /* If the thing I should be doing is already being done, wait for it. */
287 if(count ? c->out.writing : c->in.reading)
289 pthread_cond_wait(cond, &c->iolock);
294 memset(&fd, 0, sizeof(fd));
299 FD_SET(c->fd, &rfds);
306 fd.events |= POLLOUT;
313 FD_SET(c->fd, &wfds);
318 pthread_mutex_unlock(&c->iolock);
321 ret = poll(&fd, 1, -1);
323 ret = select(c->fd + 1, &rfds, &wfds, 0, 0);
325 } while (ret == -1 && errno == EINTR);
328 _xcb_conn_shutdown(c);
331 pthread_mutex_lock(&c->iolock);
336 if((fd.revents & POLLIN) == POLLIN)
338 if(FD_ISSET(c->fd, &rfds))
340 ret = ret && _xcb_in_read(c);
343 if((fd.revents & POLLOUT) == POLLOUT)
345 if(FD_ISSET(c->fd, &wfds))
347 ret = ret && write_vec(c, vector, count);