1 files changed, 19 insertions, 0 deletions
diff --git a/lib/sleepy_penguin.rb b/lib/sleepy_penguin.rb
index 07c431b..5722f2a 100644
--- a/lib/sleepy_penguin.rb
+++ b/lib/sleepy_penguin.rb
@@ -19,4 +19,23 @@ end
  module SleepyPenguin
    require_relative 'sleepy_penguin/splice' if respond_to?(:__splice)
    require_relative 'sleepy_penguin/cfr' if respond_to?(:__cfr)
+
+  # Copies +len+ bytes from +src+ to +dst+, where +src+ refers to
+  # an open, mmap(2)-able File and +dst+ refers to a Socket.
+  # An optional +offset+ keyword may be specified for the +src+ File.
+  # Using +offset+ will not adjust the offset of the underlying file
+  # handle itself; in other words: this allows concurrent threads to
+  # use linux_sendfile to write data from one open file to multiple
+  # sockets.
+  #
+  # Returns the number of bytes written on success, or :wait_writable
+  # if the +dst+ Socket is non-blocking and the operation would block.
+  # A return value of zero bytes indicates EOF is reached on the +src+
+  # file.
+  #
+  # Newer OSes may be more flexible in whether or not +dst+ or +src+
+  # is a regular file or socket, respectively.
+  def self.linux_sendfile(dst, src, len, offset: nil)
+    __lsf(dst, src, offset, len)
+  end
  end