Stop printing when stdout is closed.

runtime/bin/eventhandler_android.cc

 // Copyright (c) 2012, 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_ANDROID)
 
 #include "bin/eventhandler.h"
 
 #include <errno.h>  // NOLINT
@@ skipping 198 matching lines @@
         // Close the socket for writing.
         sd->ShutdownWrite();
         UpdateEpollInstance(epoll_fd_, sd);
       } else if ((msg.data & (1 << kCloseCommand)) != 0) {
         ASSERT(msg.data == (1 << kCloseCommand));
         // Close the socket and free system resources and move on to
         // next message.
         RemoveFromEpollInstance(epoll_fd_, sd);
         intptr_t fd = sd->fd();
         sd->Close();
+        // If stdout, reuse fd and direct to /dev/null.
+        if (fd == fileno(stdout)) USE(fopen("/dev/null", "r"));

[kustermann, 2013/06/27 11:51:09]

A few questions here:
 - can we safely use fileno() here? Man page says
  ERRORS ...
      (However, in case fileno() detects that its argument is  not  a
       valid stream, it must return -1 and set errno to EBADF.)
 - are we garanteed that the fopen() will use the stdout fd (Seems we're relying
on an implementation detail here. Maybe we should check and if it's not the case
use "dup()")
 - I don't know how "FILE *stdout"/fopen is implemented, but fopen() returns
probably a differen FILE instance than what 'stdout' is refering to. Maybe an
issue?
 - you're opening /dev/null as "r", shouldn't it be "w" ?

[Anders Johnsen, 2013/06/27 14:45:52]

Done.

         socket_map_.Remove(GetHashmapKeyFromFd(fd), GetHashmapHashFromFd(fd));
         delete sd;
       } else {
         // Setup events to wait for.
         sd->SetPortAndMask(msg.dart_port, msg.data);
         UpdateEpollInstance(epoll_fd_, sd);
       }
     }
   }
 }
@@ skipping 198 matching lines @@
 
 uint32_t EventHandlerImplementation::GetHashmapHashFromFd(intptr_t fd) {
   // The hashmap does not support keys with value 0.
   return dart::Utils::WordHash(fd + 1);
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_ANDROID)