From d96af2dd3333e8870523402de97f022796c34b5c Mon Sep 17 00:00:00 2001
From: Jan Daniel Bothma <jan.bothma@erlang-solutions.com>
Date: Wed, 14 Nov 2012 18:01:07 +0100
Subject: Basic documentation of the 'ram' mode in the 'file' module

---
 lib/kernel/doc/src/file.xml | 6 +++++-
 lib/kernel/src/file.erl     | 5 +++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/lib/kernel/doc/src/file.xml b/lib/kernel/doc/src/file.xml
index b2a259080d..89190d8668 100644
--- a/lib/kernel/doc/src/file.xml
+++ b/lib/kernel/doc/src/file.xml
@@ -610,7 +610,7 @@
       <name name="open" arity="2"/>
       <fsummary>Open a file</fsummary>
       <desc>
-        <p>Opens the file <c><anno>Filename</anno></c> in the mode determined
+        <p>Opens the file <c><anno>File</anno></c> in the mode determined
           by <c><anno>Modes</anno></c>, which may contain one or more of the
           following items:</p>
         <taglist>
@@ -767,6 +767,10 @@
 	    <p>The Encoding can be changed for a file "on the fly" by using the <seealso marker="stdlib:io#setopts/2">io:setopts/2</seealso> function, why a file can be analyzed in latin1 encoding for i.e. a BOM, positioned beyond the BOM and then be set for the right encoding before further reading.See the <seealso marker="stdlib:unicode">unicode(3)</seealso> module for functions identifying BOM's.</p>
 	    <p>This option is not allowed on <c>raw</c> files.</p>
           </item>
+          <tag><c>ram</c></tag>
+          <item>
+            <p><c>File</c> must be <c>iodata()</c>. Returns an <c>fd()</c> which lets the <c>file</c> module operate on the data in-memory as if it is a file.</p>
+          </item>
         </taglist>
         <p>Returns:</p>
         <taglist>
diff --git a/lib/kernel/src/file.erl b/lib/kernel/src/file.erl
index 22af38c598..85426baba1 100644
--- a/lib/kernel/src/file.erl
+++ b/lib/kernel/src/file.erl
@@ -88,7 +88,7 @@
                    | {'cur', Offset :: integer()}
 		   | {'eof', Offset :: integer()} | 'bof' | 'cur' | 'eof'.
 -type mode()      :: 'read' | 'write' | 'append'
-                   | 'exclusive' | 'raw' | 'binary'
+                   | 'exclusive' | 'raw' | 'binary' | 'ram'
 		   | {'delayed_write',
                       Size :: non_neg_integer(),
                       Delay :: non_neg_integer()}
@@ -397,7 +397,8 @@ raw_write_file_info(Name, #file_info{} = Info) ->
 
 %% Contemporary mode specification - list of options
 
--spec open(Filename, Modes) -> {ok, IoDevice} | {error, Reason} when
+-spec open(File, Modes) -> {ok, IoDevice} | {error, Reason} when
+      File :: Filename | iodata(),
       Filename :: name(),
       Modes :: [mode()],
       IoDevice :: io_device(),
-- 
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