* bootstraptest/test_io.c: add a test for [ruby-dev:46834].

* io.c (rb_cloexec_fcntl_dupfd) Use an emulation with dup(2) when
  fcntl(2) and/or F_DUPFD is unavailable.
  Suggested by akr.

* configure.in (HAVE_FCNTL): NativeClient does not provide fcntl(2).

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38713 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 0 deletions

diff --git a/bootstraptest/test_io.rb b/bootstraptest/test_io.rb
index ff858b67fb..f7360f34b3 100644
--- a/bootstraptest/test_io.rb
+++ b/bootstraptest/test_io.rb
@@ -74,6 +74,12 @@ assert_equal 'ok', %q{
   :ok
 }
 
+assert_equal 'ok', %q{
+  dup = STDIN.dup
+  dupfd = dup.fileno
+  dupfd == STDIN.dup.fileno ? :ng : :ok
+}, '[ruby-dev:46834]'
+
 assert_normal_exit %q{
   ARGF.set_encoding "foo"
 }