lib/webrick/utils.rb: simplify by avoiding fcntl

IO#nonblock= and IO#close_on_exec= methods are simpler-to-use
and potentially more portable to for future OSes.
IO#nonblock= and IO#close_on_exec= are also smart enough to avoid
redundantly setting flags so a syscall may be avoided.

These methods could probably be removed entirely and inlined, but
it's unclear if there is 3rd-party code which relies on them.

* lib/webrick/utils.rb (set_non_blocking): use IO#nonblock=
* (set_close_on_exec): use IO#close_on_exec=
  [Feature #11136]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50523 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Sun May 17 17:21:29 2015  Eric Wong  <e@80x24.org>
+
+	* lib/webrick/utils.rb (set_non_blocking): use IO#nonblock=
+	* (set_close_on_exec): use IO#close_on_exec=
+	  [Feature #11136]
+
 Sun May 17 15:01:26 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* numeric.c (num_positive_p, num_negative_p): add methods

lib/webrick/utils.rb

@@ -9,7 +9,7 @@
 # $IPR: utils.rb,v 1.10 2003/02/16 22:22:54 gotoyuzo Exp $
 
 require 'socket'
-require 'fcntl'
+require 'io/nonblock'
 require 'etc'
 
 module WEBrick
@@ -17,20 +17,14 @@ module WEBrick
     ##
     # Sets IO operations on +io+ to be non-blocking
     def set_non_blocking(io)
-      flag = File::NONBLOCK
-      if defined?(Fcntl::F_GETFL)
-        flag |= io.fcntl(Fcntl::F_GETFL)
-      end
-      io.fcntl(Fcntl::F_SETFL, flag)
+      io.nonblock = true if io.respond_to?(:nonblock=)
     end
     module_function :set_non_blocking
 
     ##
     # Sets the close on exec flag for +io+
     def set_close_on_exec(io)
-      if defined?(Fcntl::FD_CLOEXEC)
-        io.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
-      end
+      io.close_on_exec = true if io.respond_to?(:close_on_exec=)
     end
     module_function :set_close_on_exec