From e293ad1b08b2f937555a102e6f3b4336574773c8 Mon Sep 17 00:00:00 2001
From: Serge Aleynikov <saleyn@gmail.com>
Date: Wed, 30 Dec 2015 13:29:34 -0500
Subject: Assign externally open fd to gen_tcp (UDS support)

When a AF_LOCAL file descriptor is created externally (e.g. Unix
Domain Socket) and passed to `gen_tcp:listen(0, [{fd, FD}])`, the
implementation incorrectly assigned the address family to be equal
to `inet`, which in the inet_drv driver translated to AF_INET instead
of AF_LOCAL (or AF_UNIX), and an `einval` error code was returned.
This patch fixes this problem such that the file descriptors of the
`local` address family are supported in the inet:fdopen/5,
gen_tcp:connect/3, gen_tcp:listen/2, gen_udp:open/2 calls
---
 lib/kernel/doc/src/gen_tcp.xml | 7 +++++++
 lib/kernel/doc/src/gen_udp.xml | 7 +++++++
 2 files changed, 14 insertions(+)

(limited to 'lib/kernel/doc/src')

diff --git a/lib/kernel/doc/src/gen_tcp.xml b/lib/kernel/doc/src/gen_tcp.xml
index 6a19e76c4f..20a13782ca 100644
--- a/lib/kernel/doc/src/gen_tcp.xml
+++ b/lib/kernel/doc/src/gen_tcp.xml
@@ -132,6 +132,13 @@ do_recv(Sock, Bs) ->
             <p>Set up the socket for IPv6.</p>
           </item>
 
+		  <tag><c>local</c></tag>
+		  <item>
+            <p>Set up the socket for local address family. This option is only
+               valid together with <c>{fd, integer()}</c> when the file descriptor
+               is of local address family (e.g. a Unix Domain Socket)</p>
+          </item>
+
           <tag><c>{port, Port}</c></tag>
           <item>
             <p>Specify which local port number to use.</p>
diff --git a/lib/kernel/doc/src/gen_udp.xml b/lib/kernel/doc/src/gen_udp.xml
index 79cd87dcef..72f25d8d3f 100644
--- a/lib/kernel/doc/src/gen_udp.xml
+++ b/lib/kernel/doc/src/gen_udp.xml
@@ -101,6 +101,13 @@
             <p>Set up the socket for IPv4.</p>
           </item>
 
+		  <tag><c>local</c></tag>
+		  <item>
+            <p>Set up the socket for local address family. This option is only
+               valid together with <c>{fd, integer()}</c> when the file descriptor
+               is of local address family (e.g. a Unix Domain Socket)</p>
+          </item>
+
 		  <tag><c>{udp_module, module()}</c></tag>
 		  <item> <p>
 				  Override which callback module is used. Defaults to
-- 
cgit v1.2.3