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.

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