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 class XScopedDisplay {
  38  public:
  39   XScopedDisplay() : display_(NULL) {}
  40   ~XScopedDisplay() {
  41     if (display_) XCloseDisplay(display_);
  42   }
  43
  44   void set(Display* display) { display_ = display; }
  45   Display* display() { return display_; }
  46
  47  private:
  48   Display* display_;
  49 };
  50
  51 int main(int argc, char* argv[]) {
  52   XScopedDisplay scoped_display;
  53   if (argv[1] && strcmp(argv[1], "--noserver") == 0) {
  54     scoped_display.set(XOpenDisplay(NULL));
  55     if (scoped_display.display()) {
  56       fprintf(stderr, "Found unexpected connectable display %s\n",
  57               XDisplayName(NULL));
  58     }
  59     // Return success when we got an unexpected display so that the code
  60     // without the --noserver is the same, but slow, rather than inverted.
  61     return !scoped_display.display();
  62   }
  63
  64   int kNumTries = 78;  // 78*77/2 * 10 = 30s of waiting
  65   int tries;
  66   for (tries = 0; tries < kNumTries; ++tries) {
  67     scoped_display.set(XOpenDisplay(NULL));
  68     if (scoped_display.display())
  69       break;
  70     Sleep(10 * tries);
  71   }
  72
  73   if (!scoped_display.display()) {
  74     fprintf(stderr, "Failed to connect to %s\n", XDisplayName(NULL));
  75     return -1;
  76   }
  77
  78   fprintf(stderr, "Connected after %d retries\n", tries);
  79
  80 #if defined(USE_AURA)
  81   // Check for XInput2
  82   int opcode, event, err;
  83   if (!XQueryExtension(scoped_display.display(), "XInputExtension", &opcode,
  84                        &event, &err)) {
  85     fprintf(stderr,
  86         "Failed to get XInputExtension on %s.\n", XDisplayName(NULL));
  87     return -2;
  88   }
  89
  90   int major = 2, minor = 0;
  91   if (XIQueryVersion(scoped_display.display(), &major, &minor) == BadRequest) {
  92     fprintf(stderr,
  93         "Server does not have XInput2 on %s.\n", XDisplayName(NULL));
  94     return -3;
  95   }
  96
  97   // Ask for the list of devices. This can cause some Xvfb to crash.
  98   int count = 0;
  99   XIDeviceInfo* devices =
 100       XIQueryDevice(scoped_display.display(), XIAllDevices, &count);
 101   if (devices)
 102     XIFreeDeviceInfo(devices);
 103
 104   fprintf(stderr,
 105       "XInput2 verified initially sane on %s.\n", XDisplayName(NULL));
 106 #endif
 107   return 0;
 108 }
 109
 110 #if defined(LEAK_SANITIZER)
 111 // XOpenDisplay leaks memory if it takes more than one try to connect. This
 112 // causes LSan bots to fail. We don't care about memory leaks in xdisplaycheck
 113 // anyway, so just disable LSan completely.
 114 // This function isn't referenced from the executable itself. Make sure it isn't
 115 // stripped by the linker.
 116 __attribute__((used))
 117 __attribute__((visibility("default")))
 118 extern "C" int __lsan_is_turned_off() { return 1; }
 119 #endif