Stop printing when stdout is closed.

runtime/bin/eventhandler_android.cc

Index: runtime/bin/eventhandler_android.cc
diff --git a/runtime/bin/eventhandler_android.cc b/runtime/bin/eventhandler_android.cc
index bbc8acbc8bec5ea726fc780a7cb6b62bb49d7e20..6bacfb60c4f28c99d2769b246733da6e2b0fa4bc 100644
--- a/runtime/bin/eventhandler_android.cc
+++ b/runtime/bin/eventhandler_android.cc
@@ -216,6 +216,8 @@ void EventHandlerImplementation::HandleInterruptFd() {
         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 {