git.demorecorder.com Git - free-sw/xcb/libxcb/blob - src/xcb_conn.c

   1 /* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
   2  *
   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:
   9  *
  10  * The above copyright notice and this permission notice shall be included in
  11  * all copies or substantial portions of the Software.
  12  *
  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.
  19  *
  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.
  24  */
  25
  26 /* Connection management: the core of XCB. */
  27
  28 #include <assert.h>
  29 #include <string.h>
  30 #include <stdio.h>
  31 #include <unistd.h>
  32 #include <stdlib.h>
  33 #include <netinet/in.h>
  34 #include <sys/select.h>
  35
  36 #include "xcb.h"
  37 #include "xcbint.h"
  38
  39 static int write_setup(XCBConnection *c, XCBAuthInfo *auth_info)
  40 {
  41     XCBConnSetupReq out;
  42     struct iovec parts[3];
  43     int count = 0;
  44     int endian = 0x01020304;
  45     int ret;
  46
  47     memset(&out, 0, sizeof(out));
  48
  49     /* B = 0x42 = MSB first, l = 0x6c = LSB first */
  50     if(htonl(endian) == endian)
  51         out.byte_order = 0x42;
  52     else
  53         out.byte_order = 0x6c;
  54     out.protocol_major_version = X_PROTOCOL;
  55     out.protocol_minor_version = X_PROTOCOL_REVISION;
  56     out.authorization_protocol_name_len = 0;
  57     out.authorization_protocol_data_len = 0;
  58     parts[count].iov_len = sizeof(XCBConnSetupReq);
  59     parts[count++].iov_base = &out;
  60
  61     if(auth_info)
  62     {
  63         parts[count].iov_len = out.authorization_protocol_name_len = auth_info->namelen;
  64         parts[count++].iov_base = auth_info->name;
  65         parts[count].iov_len = out.authorization_protocol_data_len = auth_info->datalen;
  66         parts[count++].iov_base = auth_info->data;
  67     }
  68
  69     pthread_mutex_lock(&c->iolock);
  70     _xcb_out_write_block(c, parts, count);
  71     ret = _xcb_out_flush(c);
  72     pthread_mutex_unlock(&c->iolock);
  73     if(ret <= 0)
  74         return 0;
  75     return 1;
  76 }
  77
  78 static int read_setup(XCBConnection *c)
  79 {
  80     /* Read the server response */
  81     c->setup = malloc(sizeof(XCBConnSetupGenericRep));
  82     if(!c->setup)
  83         return 0;
  84
  85     if(_xcb_read_block(c->fd, c->setup, sizeof(XCBConnSetupGenericRep)) != sizeof(XCBConnSetupGenericRep))
  86         return 0;
  87
  88     {
  89         void *tmp = realloc(c->setup, c->setup->length * 4 + sizeof(XCBConnSetupGenericRep));
  90         if(!tmp)
  91             return 0;
  92         c->setup = tmp;
  93     }
  94
  95     if(_xcb_read_block(c->fd, (char *) c->setup + sizeof(XCBConnSetupGenericRep), c->setup->length * 4) <= 0)
  96         return 0;
  97
  98     /* 0 = failed, 2 = authenticate, 1 = success */
  99     switch(c->setup->status)
 100     {
 101     case 0: /* failed */
 102         {
 103             XCBConnSetupFailedRep *setup = (XCBConnSetupFailedRep *) c->setup;
 104             write(STDERR_FILENO, XCBConnSetupFailedRepReason(setup), XCBConnSetupFailedRepReasonLength(setup));
 105             return 0;
 106         }
 107
 108     case 2: /* authenticate */
 109         {
 110             XCBConnSetupAuthenticateRep *setup = (XCBConnSetupAuthenticateRep *) c->setup;
 111             write(STDERR_FILENO, XCBConnSetupAuthenticateRepReason(setup), XCBConnSetupAuthenticateRepReasonLength(setup));
 112             return 0;
 113         }
 114     }
 115
 116     return 1;
 117 }
 118
 119 /* Public interface */
 120
 121 XCBConnSetupSuccessRep *XCBGetSetup(XCBConnection *c)
 122 {
 123     /* doesn't need locking because it's never written to. */
 124     return c->setup;
 125 }
 126
 127 int XCBGetFileDescriptor(XCBConnection *c)
 128 {
 129     /* doesn't need locking because it's never written to. */
 130     return c->fd;
 131 }
 132
 133 XCBConnection *XCBConnectToFD(int fd, XCBAuthInfo *auth_info)
 134 {
 135     XCBConnection* c;
 136
 137     c = calloc(1, sizeof(XCBConnection));
 138     if(!c)
 139         return 0;
 140
 141     c->fd = fd;
 142
 143     if(!(
 144         _xcb_set_fd_flags(fd) &&
 145         pthread_mutex_init(&c->iolock, 0) == 0 &&
 146         _xcb_in_init(&c->in) &&
 147         _xcb_out_init(&c->out) &&
 148         write_setup(c, auth_info) &&
 149         read_setup(c) &&
 150         _xcb_ext_init(c) &&
 151         _xcb_xid_init(c)
 152         ))
 153     {
 154         XCBDisconnect(c);
 155         return 0;
 156     }
 157
 158     return c;
 159 }
 160
 161 void XCBDisconnect(XCBConnection *c)
 162 {
 163     if(!c)
 164         return;
 165
 166     free(c->setup);
 167     close(c->fd);
 168
 169     pthread_mutex_destroy(&c->iolock);
 170     _xcb_in_destroy(&c->in);
 171     _xcb_out_destroy(&c->out);
 172
 173     _xcb_ext_destroy(c);
 174     _xcb_xid_destroy(c);
 175
 176     free(c);
 177 }
 178
 179 /* Private interface */
 180
 181 int _xcb_conn_wait(XCBConnection *c, const int should_write, pthread_cond_t *cond)
 182 {
 183     int ret = 1;
 184     fd_set rfds, wfds;
 185
 186     _xcb_assert_valid_sequence(c);
 187
 188     /* If the thing I should be doing is already being done, wait for it. */
 189     if(should_write ? c->out.writing : c->in.reading)
 190     {
 191         pthread_cond_wait(cond, &c->iolock);
 192         return 1;
 193     }
 194
 195     FD_ZERO(&rfds);
 196     FD_SET(c->fd, &rfds);
 197     ++c->in.reading;
 198
 199     FD_ZERO(&wfds);
 200     if(should_write)
 201     {
 202         FD_SET(c->fd, &wfds);
 203         ++c->out.writing;
 204     }
 205
 206     pthread_mutex_unlock(&c->iolock);
 207     ret = select(c->fd + 1, &rfds, &wfds, 0, 0);
 208     pthread_mutex_lock(&c->iolock);
 209
 210     if(ret <= 0) /* error: select failed */
 211         goto done;
 212
 213     if(FD_ISSET(c->fd, &rfds))
 214         if((ret = _xcb_in_read(c)) <= 0)
 215             goto done;
 216
 217     if(FD_ISSET(c->fd, &wfds))
 218         if((ret = _xcb_out_write(c)) <= 0)
 219             goto done;
 220
 221 done:
 222     if(should_write)
 223         --c->out.writing;
 224     --c->in.reading;
 225
 226     return ret > 0;
 227 }