evdev: Support device hotplug with udev

ui/events/ozone/evdev/key_event_converter.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/ozone/evdev/key_event_converter.h"
 
 #include <errno.h>
 #include <linux/input.h>
 
 #include "base/message_loop/message_pump_ozone.h"
@@ skipping 197 matching lines @@
 void KeyEventConverterEvdev::Stop() {
   controller_.StopWatchingFileDescriptor();
 }
 
 void KeyEventConverterEvdev::OnFileCanReadWithoutBlocking(int fd) {
   input_event inputs[4];
   ssize_t read_size = read(fd, inputs, sizeof(inputs));
   if (read_size < 0) {
     if (errno == EINTR || errno == EAGAIN)
       return;
-    PLOG(ERROR) << "error reading device " << path_.value();
+    if (errno != ENODEV)
+      PLOG(ERROR) << "error reading device " << path_.value();
     Stop();
     return;
   }
 
   CHECK_EQ(read_size % sizeof(*inputs), 0u);
   ProcessEvents(inputs, read_size / sizeof(*inputs));
 }
 
 void KeyEventConverterEvdev::OnFileCanWriteWithoutBlocking(int fd) {
   NOTREACHED();
@@ skipping 28 matching lines @@
   }
 
   int flags = modifiers_->GetModifierFlags();
 
   scoped_ptr<KeyEvent> key_event(
       new KeyEvent(down ? ET_KEY_PRESSED : ET_KEY_RELEASED, code, flags, true));
   DispatchEvent(key_event.PassAs<ui::Event>());
 }
 
 }  // namespace ui