nobu	2018-04-13 15:26:30 +0900 (Fri, 13 Apr 2018)

  New Revision: 63143

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63143

  Log:
    file.c: chardev is loadable
    
    * file.c (ruby_is_fd_loadable): allow character devices to load,
      e.g., `ruby /dev/null` exits successfully.

  Modified files:
    trunk/file.c
    trunk/test/ruby/test_rubyoptions.rb
Index: file.c
===================================================================
--- file.c	(revision 63142)
+++ file.c	(revision 63143)
@@ -5959,7 +5959,7 @@ ruby_is_fd_loadable(int fd) https://github.com/ruby/ruby/blob/trunk/file.c#L5959
     if (S_ISREG(st.st_mode))
 	return 1;
 
-    if (S_ISFIFO(st.st_mode))
+    if (S_ISFIFO(st.st_mode) || S_ISCHR(st.st_mode))
 	return -1;
 
     if (S_ISDIR(st.st_mode))
Index: test/ruby/test_rubyoptions.rb
===================================================================
--- test/ruby/test_rubyoptions.rb	(revision 63142)
+++ test/ruby/test_rubyoptions.rb	(revision 63143)
@@ -1020,4 +1020,9 @@ class TestRubyOptions < Test::Unit::Test https://github.com/ruby/ruby/blob/trunk/test/ruby/test_rubyoptions.rb#L1020
       end
     end
   end
+
+  def test_null_script
+    skip "#{IO::NULL} is not a character device" unless File.chardev?(IO::NULL)
+    assert_in_out_err([IO::NULL], success: true)
+  end
 end

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