From 3e09ac0c10c95bb24a08af62393b4f761e2743d0 Mon Sep 17 00:00:00 2001
From: Eric Wong <normalperson@yhbt.net>
Date: Sat, 24 Aug 2013 09:54:45 +0000
Subject: initial commit

---
 lib/dtas/pipe.rb | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 lib/dtas/pipe.rb

(limited to 'lib/dtas/pipe.rb')

diff --git a/lib/dtas/pipe.rb b/lib/dtas/pipe.rb
new file mode 100644
index 0000000..891e9cd
--- /dev/null
+++ b/lib/dtas/pipe.rb
@@ -0,0 +1,40 @@
+# -*- encoding: binary -*-
+# :stopdoc:
+# Copyright (C) 2013, Eric Wong <normalperson@yhbt.net>
+# License: GPLv3 or later (https://www.gnu.org/licenses/gpl-3.0.txt)
+begin
+  require 'io/splice'
+rescue LoadError
+end
+require_relative '../dtas'
+require_relative 'writable_iter'
+
+class DTAS::Pipe < IO
+  include DTAS::WritableIter
+  attr_accessor :sink
+
+  def self.new
+    _, w = rv = pipe
+    w.writable_iter_init
+    rv
+  end
+
+  # create no-op methods for non-Linux
+  unless method_defined?(:pipe_size=)
+    def pipe_size=(_)
+    end
+
+    def pipe_size
+    end
+  end
+end
+
+# for non-blocking sinks, this avoids extra fcntl(..., F_GETFL) syscalls
+# We don't need fcntl at all for splice/tee in Linux
+# For non-Linux, we write_nonblock/read_nonblock already call fcntl()
+# behind our backs, so there's no need to repeat it.
+class DTAS::PipeNB < DTAS::Pipe
+  def nonblock?
+    true
+  end
+end
-- 
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