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. */
41 #include <sys/select.h>
45 #include "xcb_windefs.h"
47 #include <sys/socket.h>
48 #include <netinet/in.h>
51 /* SHUT_RDWR is fairly recent and is not available on all platforms */
52 #if !defined(SHUT_RDWR)
60 } xcb_setup_generic_t;
62 static const int xcb_con_error = XCB_CONN_ERROR;
63 static const int xcb_con_closed_mem_er = XCB_CONN_CLOSED_MEM_INSUFFICIENT;
64 static const int xcb_con_closed_parse_er = XCB_CONN_CLOSED_PARSE_ERR;
66 static int set_fd_flags(const int fd)
68 /* Win32 doesn't have file descriptors and the fcntl function. This block sets the socket in non-blocking mode */
71 u_long iMode = 1; /* non-zero puts it in non-blocking mode, 0 in blocking mode */
74 ret = ioctlsocket(fd, FIONBIO, &iMode);
79 int flags = fcntl(fd, F_GETFL, 0);
83 if(fcntl(fd, F_SETFL, flags) == -1)
85 if(fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
91 static int write_setup(xcb_connection_t *c, xcb_auth_info_t *auth_info)
93 static const char pad[3];
94 xcb_setup_request_t out;
95 struct iovec parts[6];
97 static const uint32_t endian = 0x01020304;
100 memset(&out, 0, sizeof(out));
102 /* B = 0x42 = MSB first, l = 0x6c = LSB first */
103 if(htonl(endian) == endian)
104 out.byte_order = 0x42;
106 out.byte_order = 0x6c;
107 out.protocol_major_version = X_PROTOCOL;
108 out.protocol_minor_version = X_PROTOCOL_REVISION;
109 out.authorization_protocol_name_len = 0;
110 out.authorization_protocol_data_len = 0;
111 parts[count].iov_len = sizeof(xcb_setup_request_t);
112 parts[count++].iov_base = &out;
113 parts[count].iov_len = XCB_PAD(sizeof(xcb_setup_request_t));
114 parts[count++].iov_base = (char *) pad;
118 parts[count].iov_len = out.authorization_protocol_name_len = auth_info->namelen;
119 parts[count++].iov_base = auth_info->name;
120 parts[count].iov_len = XCB_PAD(out.authorization_protocol_name_len);
121 parts[count++].iov_base = (char *) pad;
122 parts[count].iov_len = out.authorization_protocol_data_len = auth_info->datalen;
123 parts[count++].iov_base = auth_info->data;
124 parts[count].iov_len = XCB_PAD(out.authorization_protocol_data_len);
125 parts[count++].iov_base = (char *) pad;
127 assert(count <= (int) (sizeof(parts) / sizeof(*parts)));
129 pthread_mutex_lock(&c->iolock);
130 ret = _xcb_out_send(c, parts, count);
131 pthread_mutex_unlock(&c->iolock);
135 static int read_setup(xcb_connection_t *c)
137 /* Read the server response */
138 c->setup = malloc(sizeof(xcb_setup_generic_t));
142 if(_xcb_in_read_block(c, c->setup, sizeof(xcb_setup_generic_t)) != sizeof(xcb_setup_generic_t))
146 void *tmp = realloc(c->setup, c->setup->length * 4 + sizeof(xcb_setup_generic_t));
152 if(_xcb_in_read_block(c, (char *) c->setup + sizeof(xcb_setup_generic_t), c->setup->length * 4) <= 0)
155 /* 0 = failed, 2 = authenticate, 1 = success */
156 switch(c->setup->status)
160 xcb_setup_failed_t *setup = (xcb_setup_failed_t *) c->setup;
161 write(STDERR_FILENO, xcb_setup_failed_reason(setup), xcb_setup_failed_reason_length(setup));
165 case 2: /* authenticate */
167 xcb_setup_authenticate_t *setup = (xcb_setup_authenticate_t *) c->setup;
168 write(STDERR_FILENO, xcb_setup_authenticate_reason(setup), xcb_setup_authenticate_reason_length(setup));
176 /* precondition: there must be something for us to write. */
177 static int write_vec(xcb_connection_t *c, struct iovec **vector, int *count)
180 assert(!c->out.queue_len);
188 /* Could use the WSASend win32 function for scatter/gather i/o but setting up the WSABUF struct from
189 an iovec would require more work and I'm not sure of the benefit....works for now */
193 ret = send(c->fd,vec->iov_base,vec->iov_len,0);
194 if(ret == SOCKET_ERROR)
196 err = WSAGetLastError();
197 if(err == WSAEWOULDBLOCK)
207 n = writev(c->fd, *vector, *count);
208 if(n < 0 && errno == EAGAIN)
214 _xcb_conn_shutdown(c, XCB_CONN_ERROR);
218 for(; *count; --*count, ++*vector)
220 int cur = (*vector)->iov_len;
223 (*vector)->iov_len -= cur;
224 (*vector)->iov_base = (char *) (*vector)->iov_base + cur;
226 if((*vector)->iov_len)
235 /* Public interface */
237 const xcb_setup_t *xcb_get_setup(xcb_connection_t *c)
241 /* doesn't need locking because it's never written to. */
245 int xcb_get_file_descriptor(xcb_connection_t *c)
249 /* doesn't need locking because it's never written to. */
253 int xcb_connection_has_error(xcb_connection_t *c)
255 /* doesn't need locking because it's read and written atomically. */
259 xcb_connection_t *xcb_connect_to_fd(int fd, xcb_auth_info_t *auth_info)
265 if(fd >= FD_SETSIZE) /* would overflow in FD_SET */
268 return _xcb_conn_ret_error(XCB_CONN_ERROR);
273 c = calloc(1, sizeof(xcb_connection_t));
276 return _xcb_conn_ret_error(XCB_CONN_CLOSED_MEM_INSUFFICIENT) ;
283 pthread_mutex_init(&c->iolock, 0) == 0 &&
284 _xcb_in_init(&c->in) &&
285 _xcb_out_init(&c->out) &&
286 write_setup(c, auth_info) &&
293 return _xcb_conn_ret_error(XCB_CONN_ERROR);
299 void xcb_disconnect(xcb_connection_t *c)
306 /* disallow further sends and receives */
307 shutdown(c->fd, SHUT_RDWR);
310 pthread_mutex_destroy(&c->iolock);
311 _xcb_in_destroy(&c->in);
312 _xcb_out_destroy(&c->out);
324 /* Private interface */
326 void _xcb_conn_shutdown(xcb_connection_t *c, int err)
331 /* Return connection error state.
332 * To make thread-safe, I need a seperate static
333 * variable for every possible error.
335 xcb_connection_t *_xcb_conn_ret_error(int err)
340 case XCB_CONN_CLOSED_MEM_INSUFFICIENT:
342 return (xcb_connection_t *) &xcb_con_closed_mem_er;
344 case XCB_CONN_CLOSED_PARSE_ERR:
346 return (xcb_connection_t *) &xcb_con_closed_parse_er;
351 return (xcb_connection_t *) &xcb_con_error;
356 int _xcb_conn_wait(xcb_connection_t *c, pthread_cond_t *cond, struct iovec **vector, int *count)
365 /* If the thing I should be doing is already being done, wait for it. */
366 if(count ? c->out.writing : c->in.reading)
368 pthread_cond_wait(cond, &c->iolock);
373 memset(&fd, 0, sizeof(fd));
378 FD_SET(c->fd, &rfds);
385 fd.events |= POLLOUT;
392 FD_SET(c->fd, &wfds);
397 pthread_mutex_unlock(&c->iolock);
400 ret = poll(&fd, 1, -1);
401 /* If poll() returns an event we didn't expect, such as POLLNVAL, treat
402 * it as if it failed. */
403 if(ret >= 0 && (fd.revents & ~fd.events))
409 ret = select(c->fd + 1, &rfds, &wfds, 0, 0);
411 } while (ret == -1 && errno == EINTR);
414 _xcb_conn_shutdown(c, XCB_CONN_ERROR);
417 pthread_mutex_lock(&c->iolock);
422 if((fd.revents & POLLIN) == POLLIN)
424 if(FD_ISSET(c->fd, &rfds))
426 ret = ret && _xcb_in_read(c);
429 if((fd.revents & POLLOUT) == POLLOUT)
431 if(FD_ISSET(c->fd, &wfds))
433 ret = ret && write_vec(c, vector, count);