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     return ret;
  74 }
  75
  76 static int read_setup(XCBConnection *c)
  77 {
  78     /* Read the server response */
  79     c->setup = malloc(sizeof(XCBConnSetupGenericRep));
  80     if(!c->setup)
  81         return 0;
  82
  83     if(_xcb_read_block(c->fd, c->setup, sizeof(XCBConnSetupGenericRep)) != sizeof(XCBConnSetupGenericRep))
  84         return 0;
  85
  86     {
  87         void *tmp = realloc(c->setup, c->setup->length * 4 + sizeof(XCBConnSetupGenericRep));
  88         if(!tmp)
  89             return 0;
  90         c->setup = tmp;
  91     }
  92
  93     if(_xcb_read_block(c->fd, (char *) c->setup + sizeof(XCBConnSetupGenericRep), c->setup->length * 4) <= 0)
  94         return 0;
  95
  96     /* 0 = failed, 2 = authenticate, 1 = success */
  97     switch(c->setup->status)
  98     {
  99     case 0: /* failed */
 100         {
 101             XCBConnSetupFailedRep *setup = (XCBConnSetupFailedRep *) c->setup;
 102             write(STDERR_FILENO, XCBConnSetupFailedRepReason(setup), XCBConnSetupFailedRepReasonLength(setup));
 103             return 0;
 104         }
 105
 106     case 2: /* authenticate */
 107         {
 108             XCBConnSetupAuthenticateRep *setup = (XCBConnSetupAuthenticateRep *) c->setup;
 109             write(STDERR_FILENO, XCBConnSetupAuthenticateRepReason(setup), XCBConnSetupAuthenticateRepReasonLength(setup));
 110             return 0;
 111         }
 112     }
 113
 114     return 1;
 115 }
 116
 117 /* Public interface */
 118
 119 XCBConnSetupSuccessRep *XCBGetSetup(XCBConnection *c)
 120 {
 121     /* doesn't need locking because it's never written to. */
 122     return c->setup;
 123 }
 124
 125 int XCBGetFileDescriptor(XCBConnection *c)
 126 {
 127     /* doesn't need locking because it's never written to. */
 128     return c->fd;
 129 }
 130
 131 XCBConnection *XCBConnectToFD(int fd, XCBAuthInfo *auth_info)
 132 {
 133     XCBConnection* c;
 134
 135     c = calloc(1, sizeof(XCBConnection));
 136     if(!c)
 137         return 0;
 138
 139     c->fd = fd;
 140
 141     if(!(
 142         _xcb_set_fd_flags(fd) &&
 143         pthread_mutex_init(&c->iolock, 0) == 0 &&
 144         _xcb_in_init(&c->in) &&
 145         _xcb_out_init(&c->out) &&
 146         write_setup(c, auth_info) &&
 147         read_setup(c) &&
 148         _xcb_ext_init(c) &&
 149         _xcb_xid_init(c)
 150         ))
 151     {
 152         XCBDisconnect(c);
 153         return 0;
 154     }
 155
 156     return c;
 157 }
 158
 159 void XCBDisconnect(XCBConnection *c)
 160 {
 161     if(!c)
 162         return;
 163
 164     free(c->setup);
 165     close(c->fd);
 166
 167     pthread_mutex_destroy(&c->iolock);
 168     _xcb_in_destroy(&c->in);
 169     _xcb_out_destroy(&c->out);
 170
 171     _xcb_ext_destroy(c);
 172     _xcb_xid_destroy(c);
 173
 174     free(c);
 175 }
 176
 177 /* Private interface */
 178
 179 int _xcb_conn_wait(XCBConnection *c, const int should_write, pthread_cond_t *cond)
 180 {
 181     int ret;
 182     fd_set rfds, wfds;
 183
 184     _xcb_assert_valid_sequence(c);
 185
 186     /* If the thing I should be doing is already being done, wait for it. */
 187     if(should_write ? c->out.writing : c->in.reading)
 188     {
 189         pthread_cond_wait(cond, &c->iolock);
 190         return 1;
 191     }
 192
 193     FD_ZERO(&rfds);
 194     FD_SET(c->fd, &rfds);
 195     ++c->in.reading;
 196
 197     FD_ZERO(&wfds);
 198     if(should_write)
 199     {
 200         FD_SET(c->fd, &wfds);
 201         ++c->out.writing;
 202     }
 203
 204     pthread_mutex_unlock(&c->iolock);
 205     ret = select(c->fd + 1, &rfds, &wfds, 0, 0) > 0;
 206     pthread_mutex_lock(&c->iolock);
 207
 208     if(ret)
 209     {
 210         if(FD_ISSET(c->fd, &rfds))
 211             ret = ret && _xcb_in_read(c) > 0;
 212
 213         if(FD_ISSET(c->fd, &wfds))
 214             ret = ret && _xcb_out_write(c) > 0;
 215     }
 216
 217     if(should_write)
 218         --c->out.writing;
 219     --c->in.reading;
 220
 221     return ret;
 222 }