tools/xdisplaycheck/xdisplaycheck.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4 //
   5 // This is a small program that tries to connect to the X server.  It
   6 // continually retries until it connects or 30 seconds pass.  If it fails
   7 // to connect to the X server or fails to find needed functiona, it returns
   8 // an error code of -1.
   9 //
  10 // This is to help verify that a useful X server is available before we start
  11 // start running tests on the build bots.
  12
  13 #include <errno.h>
  14 #include <stdio.h>
  15 #include <string.h>
  16 #include <time.h>
  17 #include <X11/Xlib.h>
  18
  19 #if defined(USE_AURA)
  20 #include <X11/extensions/XInput2.h>
  21 #endif
  22
  23 void Sleep(int duration_ms) {
  24   struct timespec sleep_time, remaining;
  25
  26   // Contains the portion of duration_ms >= 1 sec.
  27   sleep_time.tv_sec = duration_ms / 1000;
  28   duration_ms -= sleep_time.tv_sec * 1000;
  29
  30   // Contains the portion of duration_ms < 1 sec.
  31   sleep_time.tv_nsec = duration_ms * 1000 * 1000;  // nanoseconds.
  32
  33   while (nanosleep(&sleep_time, &remaining) == -1 && errno == EINTR)
  34     sleep_time = remaining;
  35 }
  36
  37 int main(int argc, char* argv[]) {
  38   Display* display = NULL;
  39   if (argv[1] && strcmp(argv[1], "--noserver") == 0) {
  40     display = XOpenDisplay(NULL);
  41     if (display) {
  42       fprintf(stderr, "Found unexpected connectable display %s\n",
  43               XDisplayName(NULL));
  44     }
  45     // Return success when we got an unexpected display so that the code
  46     // without the --noserver is the same, but slow, rather than inverted.
  47     return !display;
  48   }
  49
  50   int kNumTries = 78;  // 78*77/2 * 10 = 30s of waiting
  51   int tries;
  52   for (tries = 0; tries < kNumTries; ++tries) {
  53     display = XOpenDisplay(NULL);
  54     if (display)
  55       break;
  56     Sleep(10 * tries);
  57   }
  58
  59   if (!display) {
  60     fprintf(stderr, "Failed to connect to %s\n", XDisplayName(NULL));
  61     return -1;
  62   }
  63
  64   fprintf(stderr, "Connected after %d retries\n", tries);
  65
  66 #if defined(USE_AURA)
  67   // Check for XInput2
  68   int opcode, event, err;
  69   if (!XQueryExtension(display, "XInputExtension", &opcode, &event, &err)) {
  70     fprintf(stderr,
  71         "Failed to get XInputExtension on %s.\n", XDisplayName(NULL));
  72     return -1;
  73   }
  74
  75   int major = 2, minor = 0;
  76   if (XIQueryVersion(display, &major, &minor) == BadRequest) {
  77     fprintf(stderr,
  78         "Server does not have XInput2 on %s.\n", XDisplayName(NULL));
  79     return -1;
  80   }
  81
  82   // Ask for the list of devices. This can cause some Xvfb to crash.
  83   int count = 0;
  84   XIDeviceInfo* devices = XIQueryDevice(display, XIAllDevices, &count);
  85   if (devices)
  86     XIFreeDeviceInfo(devices);
  87
  88   fprintf(stderr,
  89       "XInput2 verified initially sane on %s.\n", XDisplayName(NULL));
  90 #endif
  91
  92   return 0;
  93 }