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>
49 } xcb_setup_generic_t;
51 static const int error_connection = 1;
53 static int set_fd_flags(const int fd)
55 int flags = fcntl(fd, F_GETFL, 0);
59 if(fcntl(fd, F_SETFL, flags) == -1)
61 if(fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
66 static int write_setup(xcb_connection_t *c, xcb_auth_info_t *auth_info)
68 static const char pad[3];
69 xcb_setup_request_t out;
70 struct iovec parts[6];
72 static const uint32_t endian = 0x01020304;
75 memset(&out, 0, sizeof(out));
77 /* B = 0x42 = MSB first, l = 0x6c = LSB first */
78 if(htonl(endian) == endian)
79 out.byte_order = 0x42;
81 out.byte_order = 0x6c;
82 out.protocol_major_version = X_PROTOCOL;
83 out.protocol_minor_version = X_PROTOCOL_REVISION;
84 out.authorization_protocol_name_len = 0;
85 out.authorization_protocol_data_len = 0;
86 parts[count].iov_len = sizeof(xcb_setup_request_t);
87 parts[count++].iov_base = &out;
88 parts[count].iov_len = XCB_PAD(sizeof(xcb_setup_request_t));
89 parts[count++].iov_base = (char *) pad;
93 parts[count].iov_len = out.authorization_protocol_name_len = auth_info->namelen;
94 parts[count++].iov_base = auth_info->name;
95 parts[count].iov_len = XCB_PAD(out.authorization_protocol_name_len);
96 parts[count++].iov_base = (char *) pad;
97 parts[count].iov_len = out.authorization_protocol_data_len = auth_info->datalen;
98 parts[count++].iov_base = auth_info->data;
99 parts[count].iov_len = XCB_PAD(out.authorization_protocol_data_len);
100 parts[count++].iov_base = (char *) pad;
102 assert(count <= (int) (sizeof(parts) / sizeof(*parts)));
104 pthread_mutex_lock(&c->iolock);
105 ret = _xcb_out_send(c, parts, count);
106 pthread_mutex_unlock(&c->iolock);
110 static int read_setup(xcb_connection_t *c)
112 /* Read the server response */
113 c->setup = malloc(sizeof(xcb_setup_generic_t));
117 if(_xcb_in_read_block(c, c->setup, sizeof(xcb_setup_generic_t)) != sizeof(xcb_setup_generic_t))
121 void *tmp = realloc(c->setup, c->setup->length * 4 + sizeof(xcb_setup_generic_t));
127 if(_xcb_in_read_block(c, (char *) c->setup + sizeof(xcb_setup_generic_t), c->setup->length * 4) <= 0)
130 /* 0 = failed, 2 = authenticate, 1 = success */
131 switch(c->setup->status)
135 xcb_setup_failed_t *setup = (xcb_setup_failed_t *) c->setup;
136 write(STDERR_FILENO, xcb_setup_failed_reason(setup), xcb_setup_failed_reason_length(setup));
140 case 2: /* authenticate */
142 xcb_setup_authenticate_t *setup = (xcb_setup_authenticate_t *) c->setup;
143 write(STDERR_FILENO, xcb_setup_authenticate_reason(setup), xcb_setup_authenticate_reason_length(setup));
151 /* precondition: there must be something for us to write. */
152 static int write_vec(xcb_connection_t *c, struct iovec **vector, int *count)
155 assert(!c->out.queue_len);
156 n = writev(c->fd, *vector, *count);
157 if(n < 0 && errno == EAGAIN)
161 _xcb_conn_shutdown(c);
165 for(; *count; --*count, ++*vector)
167 int cur = (*vector)->iov_len;
170 (*vector)->iov_len -= cur;
171 (*vector)->iov_base = (char *) (*vector)->iov_base + cur;
173 if((*vector)->iov_len)
182 /* Public interface */
184 const xcb_setup_t *xcb_get_setup(xcb_connection_t *c)
188 /* doesn't need locking because it's never written to. */
192 int xcb_get_file_descriptor(xcb_connection_t *c)
196 /* doesn't need locking because it's never written to. */
200 int xcb_connection_has_error(xcb_connection_t *c)
202 /* doesn't need locking because it's read and written atomically. */
206 xcb_connection_t *xcb_connect_to_fd(int fd, xcb_auth_info_t *auth_info)
211 if(fd >= FD_SETSIZE) /* would overflow in FD_SET */
214 return (xcb_connection_t *) &error_connection;
218 c = calloc(1, sizeof(xcb_connection_t));
221 return (xcb_connection_t *) &error_connection;
228 pthread_mutex_init(&c->iolock, 0) == 0 &&
229 _xcb_in_init(&c->in) &&
230 _xcb_out_init(&c->out) &&
231 write_setup(c, auth_info) &&
238 return (xcb_connection_t *) &error_connection;
244 void xcb_disconnect(xcb_connection_t *c)
252 pthread_mutex_destroy(&c->iolock);
253 _xcb_in_destroy(&c->in);
254 _xcb_out_destroy(&c->out);
262 /* Private interface */
264 void _xcb_conn_shutdown(xcb_connection_t *c)
269 int _xcb_conn_wait(xcb_connection_t *c, pthread_cond_t *cond, struct iovec **vector, int *count)
278 /* If the thing I should be doing is already being done, wait for it. */
279 if(count ? c->out.writing : c->in.reading)
281 pthread_cond_wait(cond, &c->iolock);
286 memset(&fd, 0, sizeof(fd));
291 FD_SET(c->fd, &rfds);
298 fd.events |= POLLOUT;
305 FD_SET(c->fd, &wfds);
310 pthread_mutex_unlock(&c->iolock);
313 ret = poll(&fd, 1, -1);
315 ret = select(c->fd + 1, &rfds, &wfds, 0, 0);
317 } while (ret == -1 && errno == EINTR);
320 _xcb_conn_shutdown(c);
323 pthread_mutex_lock(&c->iolock);
328 if((fd.revents & POLLIN) == POLLIN)
330 if(FD_ISSET(c->fd, &rfds))
332 ret = ret && _xcb_in_read(c);
335 if((fd.revents & POLLOUT) == POLLOUT)
337 if(FD_ISSET(c->fd, &wfds))
339 ret = ret && write_vec(c, vector, count);