evdev: Fix infinite loop when devices are unplugged

ui/events/ozone/evdev/touch_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/touch_event_converter.h"
 
+#include <errno.h>
 #include <fcntl.h>
 #include <linux/input.h>
 #include <poll.h>
 #include <stdio.h>
 #include <unistd.h>
 
 #include <cmath>
 #include <limits>
 
 #include "base/bind.h"
@@ skipping 92 matching lines @@
 }
 
 void TouchEventConverterEvdev::OnFileCanWriteWithoutBlocking(int /* fd */) {
   // Read-only file-descriptors.
   NOTREACHED();
 }
 
 void TouchEventConverterEvdev::OnFileCanReadWithoutBlocking(int fd) {
   input_event inputs[MAX_FINGERS * 6 + 1];
   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;
+  }
 
   for (unsigned i = 0; i < read_size / sizeof(*inputs); i++) {
     const input_event& input = inputs[i];
     if (input.type == EV_ABS) {
       switch (input.code) {
         case ABS_MT_TOUCH_MAJOR:
           altered_slots_.set(current_slot_);
           events_[current_slot_].major_ = input.value;
           break;
         case ABS_X:
@@ skipping 68 matching lines @@
         default:
           NOTREACHED() << "invalid code for EV_KEY: " << input.code;
       }
     } else {
       NOTREACHED() << "invalid type: " << input.type;
     }
   }
 }
 
 }  // namespace ui