src/vdagentd/vdagentd-xorg-conf.c

   1 /*  vdagentd.c vdagentd xorg.conf writing code
   2
   3     Copyright 2011, 2012 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 <syslog.h>
  33 #include "vdagentd-xorg-conf.h"
  34
  35 #define FPRINTF(...) \
  36     do { \
  37         r = fprintf(f, __VA_ARGS__); \
  38         if (r < 0) { \
  39             syslog(LOG_ERR, "Error writing to %s: %m", xorg_conf); \
  40             fclose(f); \
  41             pci_system_cleanup(); \
  42             return; \
  43         } \
  44     } while(0)
  45
  46 void vdagentd_write_xorg_conf(VDAgentMonitorsConfig *monitor_conf)
  47 {
  48 #ifdef HAVE_PCIACCESS
  49     int i, r, count, min_x = INT_MAX, min_y = INT_MAX;
  50     FILE *f;
  51     struct pci_device_iterator *it;
  52     struct pci_device *dev;
  53     const struct pci_id_match qxl_id_match = {
  54         .vendor_id = 0x1b36,
  55         .device_id = 0x0100,
  56         .subvendor_id = PCI_MATCH_ANY,
  57         .subdevice_id = PCI_MATCH_ANY,
  58     };
  59     const char *xorg_conf = "/var/run/spice-vdagentd/xorg.conf.spice";
  60     const char *xorg_conf_old = "/var/run/spice-vdagentd/xorg.conf.spice.old";
  61
  62     r = rename(xorg_conf, xorg_conf_old);
  63     if (r && errno != ENOENT) {
  64         syslog(LOG_ERR,
  65                "Error renaming %s to %s: %m, not generating xorg.conf",
  66                xorg_conf, xorg_conf_old);
  67         return;
  68     }
  69
  70     r = pci_system_init();
  71     if (r) {
  72         syslog(LOG_ERR, "Error initializing libpciaccess: %d, not generating xorg.conf", r);
  73         return;
  74     }
  75
  76     it = pci_id_match_iterator_create(&qxl_id_match);
  77     if (!it) {
  78         syslog(LOG_ERR, "Error could not create pci id iterator for QXL devices, not generating xorg.conf");
  79         pci_system_cleanup();
  80         return;
  81     }
  82
  83     dev = pci_device_next(it);
  84     if (!dev) {
  85         syslog(LOG_ERR, "No QXL devices found, not generating xorg.conf");
  86         pci_system_cleanup();
  87         return;
  88     }
  89
  90     f = fopen(xorg_conf, "w");
  91     if (!f) {
  92         syslog(LOG_ERR, "Error opening %s for writing: %m", xorg_conf);
  93         pci_system_cleanup();
  94         return;
  95     }
  96
  97     FPRINTF("# xorg.conf generated by spice-vdagentd\n");
  98     FPRINTF("# generated from monitor info provided by the client\n\n");
  99
 100     if (monitor_conf->num_of_monitors == 1) {
 101         FPRINTF("# Client has only 1 monitor\n");
 102         FPRINTF("# This works best with no xorg.conf, leaving xorg.conf empty\n");
 103         fclose(f);
 104         pci_system_cleanup();
 105         return;
 106     }
 107
 108     FPRINTF("Section \"ServerFlags\"\n");
 109     FPRINTF("\tOption\t\t\"Xinerama\"\t\"true\"\n");
 110     FPRINTF("EndSection\n\n");
 111
 112     i = 0;
 113     do {
 114         FPRINTF("Section \"Device\"\n");
 115         FPRINTF("\tIdentifier\t\"qxl%d\"\n", i++);
 116         FPRINTF("\tDriver\t\t\"qxl\"\n");
 117         FPRINTF("\tBusID\t\t\"PCI:%02d:%02d:%d\"\n",
 118                 dev->bus, dev->dev, dev->func);
 119         FPRINTF("\tOption\t\t\"NumHeads\"\t\"1\"\n");
 120         FPRINTF("EndSection\n\n");
 121     } while ((dev = pci_device_next(it)));
 122
 123     if (i < monitor_conf->num_of_monitors) {
 124         FPRINTF("# Client has %d monitors, but only %d qxl devices found\n",
 125                 monitor_conf->num_of_monitors, i);
 126         FPRINTF("# Only generation %d \"Screen\" sections\n\n", i);
 127         count = i;
 128     } else {
 129         count = monitor_conf->num_of_monitors;
 130     }
 131
 132     for (i = 0; i < count; i++) {
 133         FPRINTF("Section \"Screen\"\n");
 134         FPRINTF("\tIdentifier\t\"Screen%d\"\n", i);
 135         FPRINTF("\tDevice\t\t\"qxl%d\"\n", i);
 136         FPRINTF("\tDefaultDepth\t24\n");
 137         FPRINTF("\tSubSection \"Display\"\n");
 138         FPRINTF("\t\tViewport\t0 0\n");
 139         FPRINTF("\t\tDepth\t\t24\n");
 140         FPRINTF("\t\tModes\t\t\"%dx%d\"\n", monitor_conf->monitors[i].width,
 141                 monitor_conf->monitors[i].height);
 142         FPRINTF("\tEndSubSection\n");
 143         FPRINTF("EndSection\n\n");
 144     }
 145
 146     /* monitor_conf may contain negative values, convert these to 0 - # */
 147     for (i = 0; i < count; i++) {
 148         if (monitor_conf->monitors[i].x < min_x) {
 149             min_x = monitor_conf->monitors[i].x;
 150         }
 151         if (monitor_conf->monitors[i].y < min_y) {
 152             min_y = monitor_conf->monitors[i].y;
 153         }
 154     }
 155
 156     FPRINTF("Section \"ServerLayout\"\n");
 157     FPRINTF("\tIdentifier\t\"layout\"\n");
 158     for (i = 0; i < count; i++) {
 159         FPRINTF("\tScreen\t\t\"Screen%d\" %d %d\n", i,
 160                 monitor_conf->monitors[i].x - min_x,
 161                 monitor_conf->monitors[i].y - min_y);
 162     }
 163     FPRINTF("EndSection\n");
 164
 165     fclose(f);
 166     pci_system_cleanup();
 167 #endif
 168 }