Make FileSystemWatcher work on MIPS and make watching on android the same as linux.

runtime/bin/file_system_watcher_linux.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include "bin/file_system_watcher.h"
 
 #include <errno.h>  // NOLINT
 #include <sys/inotify.h>  // NOLINT
 
+#include "bin/fdutils.h"
+
 
 namespace dart {
 namespace bin {
 
 bool FileSystemWatcher::IsSupported() {
   return true;
 }
 
 
 intptr_t FileSystemWatcher::WatchPath(const char* path,
                                       int events,
                                       bool recursive) {
-  int fd = TEMP_FAILURE_RETRY(inotify_init1(IN_NONBLOCK | IN_CLOEXEC));
+  int fd = TEMP_FAILURE_RETRY(inotify_init1(IN_CLOEXEC));
   if (fd < 0) return -1;
+  // Some systems dosn't support setting this as non-blocking. Since watching
+  // internals are kept away from the user, we know it's possible to continue,
+  // even if setting non-blocking fails.
+  FDUtils::SetNonBlocking(fd);
   int list_events = IN_DELETE_SELF | IN_MOVE_SELF;
   if (events & kCreate) list_events |= IN_CREATE;
   if (events & kModifyContent) list_events |= IN_CLOSE_WRITE | IN_ATTRIB;
   if (events & kDelete) list_events |= IN_DELETE;
   if (events & kMove) list_events |= IN_MOVE;
   int path_fd = TEMP_FAILURE_RETRY(inotify_add_watch(fd, path, list_events));
   if (path_fd < 0) {
     close(fd);
     return -1;
   }
@@ skipping 50 matching lines @@
   }
   ASSERT(offset == bytes);
   return events;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)