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>
34 #include <sys/select.h>
47 static int set_fd_flags(const int fd)
49 long flags = fcntl(fd, F_GETFL, 0);
53 if(fcntl(fd, F_SETFL, flags) == -1)
55 if(fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
60 static int write_setup(XCBConnection *c, XCBAuthInfo *auth_info)
62 static const char pad[3];
64 struct iovec parts[6];
66 int endian = 0x01020304;
69 memset(&out, 0, sizeof(out));
71 /* B = 0x42 = MSB first, l = 0x6c = LSB first */
72 if(htonl(endian) == endian)
73 out.byte_order = 0x42;
75 out.byte_order = 0x6c;
76 out.protocol_major_version = X_PROTOCOL;
77 out.protocol_minor_version = X_PROTOCOL_REVISION;
78 out.authorization_protocol_name_len = 0;
79 out.authorization_protocol_data_len = 0;
80 parts[count].iov_len = sizeof(XCBSetupReq);
81 parts[count++].iov_base = &out;
82 parts[count].iov_len = XCB_PAD(sizeof(XCBSetupReq));
83 parts[count++].iov_base = (char *) pad;
87 parts[count].iov_len = out.authorization_protocol_name_len = auth_info->namelen;
88 parts[count++].iov_base = auth_info->name;
89 parts[count].iov_len = XCB_PAD(out.authorization_protocol_name_len);
90 parts[count++].iov_base = (char *) pad;
91 parts[count].iov_len = out.authorization_protocol_data_len = auth_info->datalen;
92 parts[count++].iov_base = auth_info->data;
93 parts[count].iov_len = XCB_PAD(out.authorization_protocol_data_len);
94 parts[count++].iov_base = (char *) pad;
96 assert(count <= sizeof(parts) / sizeof(*parts));
98 pthread_mutex_lock(&c->iolock);
100 struct iovec *parts_ptr = parts;
101 ret = _xcb_out_send(c, &parts_ptr, &count);
103 pthread_mutex_unlock(&c->iolock);
107 static int read_setup(XCBConnection *c)
109 /* Read the server response */
110 c->setup = malloc(sizeof(XCBSetupGeneric));
114 if(_xcb_in_read_block(c, c->setup, sizeof(XCBSetupGeneric)) != sizeof(XCBSetupGeneric))
118 void *tmp = realloc(c->setup, c->setup->length * 4 + sizeof(XCBSetupGeneric));
124 if(_xcb_in_read_block(c, (char *) c->setup + sizeof(XCBSetupGeneric), c->setup->length * 4) <= 0)
127 /* 0 = failed, 2 = authenticate, 1 = success */
128 switch(c->setup->status)
132 XCBSetupFailed *setup = (XCBSetupFailed *) c->setup;
133 write(STDERR_FILENO, XCBSetupFailedReason(setup), XCBSetupFailedReasonLength(setup));
137 case 2: /* authenticate */
139 XCBSetupAuthenticate *setup = (XCBSetupAuthenticate *) c->setup;
140 write(STDERR_FILENO, XCBSetupAuthenticateReason(setup), XCBSetupAuthenticateReasonLength(setup));
148 /* precondition: there must be something for us to write. */
149 static int write_vec(XCBConnection *c, struct iovec **vector, int *count)
152 assert(!c->out.queue_len);
153 n = writev(c->fd, *vector, *count);
154 if(n < 0 && errno == EAGAIN)
159 for(; *count; --*count, ++*vector)
161 int cur = (*vector)->iov_len;
164 (*vector)->iov_len -= cur;
165 (*vector)->iov_base = (char *) (*vector)->iov_base + cur;
167 if((*vector)->iov_len)
176 /* Public interface */
178 const XCBSetup *XCBGetSetup(XCBConnection *c)
180 /* doesn't need locking because it's never written to. */
184 int XCBGetFileDescriptor(XCBConnection *c)
186 /* doesn't need locking because it's never written to. */
190 XCBConnection *XCBConnectToFD(int fd, XCBAuthInfo *auth_info)
194 c = calloc(1, sizeof(XCBConnection));
202 pthread_mutex_init(&c->iolock, 0) == 0 &&
203 _xcb_in_init(&c->in) &&
204 _xcb_out_init(&c->out) &&
205 write_setup(c, auth_info) &&
218 void XCBDisconnect(XCBConnection *c)
226 pthread_mutex_destroy(&c->iolock);
227 _xcb_in_destroy(&c->in);
228 _xcb_out_destroy(&c->out);
236 /* Private interface */
238 int _xcb_conn_wait(XCBConnection *c, pthread_cond_t *cond, struct iovec **vector, int *count)
243 /* If the thing I should be doing is already being done, wait for it. */
244 if(count ? c->out.writing : c->in.reading)
246 pthread_cond_wait(cond, &c->iolock);
251 FD_SET(c->fd, &rfds);
257 FD_SET(c->fd, &wfds);
261 pthread_mutex_unlock(&c->iolock);
263 ret = select(c->fd + 1, &rfds, &wfds, 0, 0);
264 } while (ret == -1 && errno == EINTR);
267 pthread_mutex_lock(&c->iolock);
271 if(FD_ISSET(c->fd, &rfds))
272 ret = ret && _xcb_in_read(c);
274 if(FD_ISSET(c->fd, &wfds))
275 ret = ret && write_vec(c, vector, count);