src/vdagentd-xorg-conf.c

   1 /*  vdagentd.c vdagentd xorg.conf writing code
   2
   3     Copyright 2011 Red Hat, Inc.
   4
   5     Red Hat Authors:
   6     Hans de Goede <hdegoede@redhat.com>
   7
   8     This program is free software: you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation, either version 3 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21 #ifdef HAVE_CONFIG_H
  22 #include <config.h>
  23 #endif
  24
  25 #ifdef HAVE_PCIACCESS
  26 #include <pciaccess.h>
  27 #endif
  28
  29 #include <string.h>
  30 #include <errno.h>
  31 #include <limits.h>
  32 #include "vdagentd-xorg-conf.h"
  33
  34 #define FPRINTF(...) \
  35     do { \
  36         r = fprintf(f, __VA_ARGS__); \
  37         if (r < 0) { \
  38             fprintf(logfile, "Error writing to %s: %s\n", \
  39                     xorg_conf, strerror(errno)); \
  40             fclose(f); \
  41             pci_system_cleanup(); \
  42             return; \
  43         } \
  44     } while(0)
  45
  46 void vdagentd_write_xorg_conf(VDAgentMonitorsConfig *monitor_conf,
  47                               FILE *logfile)
  48 {
  49 #ifdef HAVE_PCIACCESS
  50     int i, r, count, min_x = INT_MAX, min_y = INT_MAX;
  51     FILE *f;
  52     struct pci_device_iterator *it;
  53     struct pci_device *dev;
  54     const struct pci_id_match qxl_id_match = {
  55         .vendor_id = 0x1b36,
  56         .device_id = 0x0100,
  57         .subvendor_id = PCI_MATCH_ANY,
  58         .subdevice_id = PCI_MATCH_ANY,
  59     };
  60     const char *xorg_conf = "/var/run/spice-vdagentd/xorg.conf.spice";
  61     const char *xorg_conf_old = "/var/run/spice-vdagentd/xorg.conf.spice.old";
  62
  63     r = rename(xorg_conf, xorg_conf_old);
  64     if (r && errno != ENOENT) {
  65         fprintf(logfile,
  66                 "Error renaming %s to %s: %s, not generating xorg.conf\n",
  67                 xorg_conf, xorg_conf_old, strerror(errno));
  68         return;
  69     }
  70
  71     r = pci_system_init();
  72     if (r) {
  73         fprintf(logfile, "Error initializing libpciaccess: %d, not generating xorg.conf\n", r);
  74         return;
  75     }
  76
  77     it = pci_id_match_iterator_create(&qxl_id_match);
  78     if (!it) {
  79         fprintf(logfile, "Error could not create pci id iterator for QXL devices, not generating xorg.conf\n");
  80         pci_system_cleanup();
  81         return;
  82     }
  83
  84     dev = pci_device_next(it);
  85     if (!dev) {
  86         fprintf(logfile, "No QXL devices found, not generating xorg.conf\n");
  87         pci_system_cleanup();
  88         return;
  89     }
  90
  91     f = fopen(xorg_conf, "w");
  92     if (!f) {
  93         fprintf(logfile, "Error opening %s for writing: %s\n",
  94                 xorg_conf, strerror(errno));
  95         pci_system_cleanup();
  96         return;
  97     }
  98
  99     FPRINTF("# xorg.conf generated by spice-vdagentd\n");
 100     FPRINTF("# generated from monitor info provided by the client\n\n");
 101
 102     if (monitor_conf->num_of_monitors == 1) {
 103         FPRINTF("# Client has only 1 monitor\n");
 104         FPRINTF("# This works best with no xorg.conf, leaving xorg.conf empty\n");
 105         fclose(f);
 106         pci_system_cleanup();
 107         return;
 108     }
 109
 110     FPRINTF("Section \"ServerFlags\"\n");
 111     FPRINTF("\tOption\t\t\"Xinerama\"\t\"true\"\n");
 112     FPRINTF("EndSection\n\n");
 113
 114     i = 0;
 115     do {
 116         FPRINTF("Section \"Device\"\n");
 117         FPRINTF("\tIdentifier\t\"qxl%d\"\n", i++);
 118         FPRINTF("\tDriver\t\t\"qxl\"\n");
 119         FPRINTF("\tBusID\t\t\"PCI:%02d:%02d:%d\"\n",
 120                 dev->bus, dev->dev, dev->func);
 121         FPRINTF("EndSection\n\n");
 122     } while ((dev = pci_device_next(it)));
 123
 124     if (i < monitor_conf->num_of_monitors) {
 125         fprintf(logfile, "Client has %d monitors, but only %d qxl devices found\n",
 126                 monitor_conf->num_of_monitors, i);
 127         FPRINTF("# Client has %d monitors, but only %d qxl devices found\n",
 128                 monitor_conf->num_of_monitors, i);
 129         FPRINTF("# Only generation %d \"Screen\" sections\n\n", i);
 130         count = i;
 131     } else {
 132         count = monitor_conf->num_of_monitors;
 133     }
 134
 135     for (i = 0; i < count; i++) {
 136         FPRINTF("Section \"Screen\"\n");
 137         FPRINTF("\tIdentifier\t\"Screen%d\"\n", i);
 138         FPRINTF("\tDevice\t\t\"qxl%d\"\n", i);
 139         FPRINTF("\tDefaultDepth\t24\n");
 140         FPRINTF("\tSubSection \"Display\"\n");
 141         FPRINTF("\t\tViewport\t0 0\n");
 142         FPRINTF("\t\tDepth\t\t24\n");
 143         FPRINTF("\t\tModes\t\t\"%dx%d\"\n", monitor_conf->monitors[i].width,
 144                 monitor_conf->monitors[i].height);
 145         FPRINTF("\tEndSubSection\n");
 146         FPRINTF("EndSection\n\n");
 147     }
 148
 149     /* monitor_conf may contain negative values, convert these to 0 - # */
 150     for (i = 0; i < count; i++) {
 151         if (monitor_conf->monitors[i].x < min_x) {
 152             min_x = monitor_conf->monitors[i].x;
 153         }
 154         if (monitor_conf->monitors[i].y < min_y) {
 155             min_y = monitor_conf->monitors[i].y;
 156         }
 157     }
 158
 159     FPRINTF("Section \"ServerLayout\"\n");
 160     FPRINTF("\tIdentifier\t\"layout\"\n");
 161     for (i = 0; i < count; i++) {
 162         FPRINTF("\tScreen\t\t\"Screen%d\" %d %d\n", i,
 163                 monitor_conf->monitors[i].x - min_x,
 164                 monitor_conf->monitors[i].y - min_y);
 165     }
 166     FPRINTF("EndSection\n");
 167
 168     fclose(f);
 169     pci_system_cleanup();
 170 #endif
 171 }