evdev: Fix infinite loop when devices are unplugged

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"
 #include "ui/events/event.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 #include "ui/events/ozone/evdev/event_modifiers.h"
 
 namespace ui {
 
 namespace {
@@ skipping 186 matching lines @@
       fd_, true, base::MessagePumpLibevent::WATCH_READ, &controller_, this);
 }
 
 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 (read_size < 0) {
+    if (errno == EINTR || errno == EAGAIN)
+      return;
+    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();
 }
 
 void KeyEventConverterEvdev::ProcessEvents(const input_event* inputs,
@@ skipping 25 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