Remove core Tempfile dependency (1.9.2-preview1 compat)

With the 1.9.2preview1 release (and presumably 1.9.1 p243), the
Ruby core team has decided that bending over backwards to
support crippled operating/file systems was necessary and that
files must be closed before unlinking.

Regardless, this is more efficient than using Tempfile because:

  1) no delegation is necessary, this is a real File object

  2) no mkdir is necessary for locking, we can trust O_EXCL
     to work properly without unnecessary FS activity

  3) no finalizer is needed to unlink the file, we unlink
     it as soon as possible after creation.

(cherry picked from commit 344b85ff28e160daa6563ab7c80b733abdeb874a)

Conflicts:

	lib/unicorn.rb
	lib/unicorn/app/exec_cgi.rb
	lib/unicorn/tee_input.rb

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/unicorn/util.rb b/lib/unicorn/util.rb
index 2d3f827..d2214b7 100644
--- a/lib/unicorn/util.rb
+++ b/lib/unicorn/util.rb
@@ -1,4 +1,5 @@
 require 'fcntl'
+require 'tmpdir'
 
 module Unicorn
   class Util
@@ -39,6 +40,22 @@ module Unicorn
         nr
       end
 
+      # creates and returns a new File object.  The File is unlinked
+      # immediately, switched to binary mode, and userspace output
+      # buffering is disabled
+      def tmpio
+        fp = begin
+          File.open("#{Dir::tmpdir}/#{rand}",
+                    File::RDWR|File::CREAT|File::EXCL, 0600)
+        rescue Errno::EEXIST
+          retry
+        end
+        File.unlink(fp.path)
+        fp.binmode
+        fp.sync = true
+        fp
+      end
+
     end
 
   end