From 70526ab4e8b5a0d84c5cfd27557a481707420ce2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20G=C3=B6m=C3=B6ri?= <gomoripeti@gmail.com>
Date: Thu, 20 Oct 2016 01:05:45 +0200
Subject: controlling_process can return {error, badarg}

For gen_tcp, gen_udp and gen_sctp controlling_process/2 can return
badarg if erlang:port_connect/2 fails with badarg. This can easily
happen if the new owner is not alive but in some race condition also
when the socket is closed right before port_connect/2 (and after the
previous socket function)
This commit documents this behaviour.
---
 lib/kernel/doc/src/gen_tcp.xml | 6 +++++-
 lib/kernel/doc/src/gen_udp.xml | 6 +++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

(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 08454b9832..e97db20062 100644
--- a/lib/kernel/doc/src/gen_tcp.xml
+++ b/lib/kernel/doc/src/gen_tcp.xml
@@ -231,7 +231,11 @@ do_recv(Sock, Bs) ->
           <c><anno>Socket</anno></c>. The controlling process is the process
           that receives messages from the socket. If called by any other
           process than the current controlling process,
-          <c>{error, not_owner}</c> is returned.</p>
+          <c>{error, not_owner}</c> is returned. If the process identified
+          by <c><anno>Pid</anno></c> is not an existing local pid,
+          <c>{error, badarg}</c> is returned. <c>{error, badarg}</c> may also
+          be returned in some cases when <c><anno>Socket</anno></c> is closed
+          during the execution of this function.</p>
           <p>If the socket is set in active mode, this function
           will transfer any messages in the mailbox of the caller
           to the new controlling process.
diff --git a/lib/kernel/doc/src/gen_udp.xml b/lib/kernel/doc/src/gen_udp.xml
index 3f88a0272d..f79566ef71 100644
--- a/lib/kernel/doc/src/gen_udp.xml
+++ b/lib/kernel/doc/src/gen_udp.xml
@@ -68,7 +68,11 @@
           <c><anno>Socket</anno></c>. The controlling process is the process
           that receives messages from the socket. If called by any other
           process than the current controlling process,
-          <c>{error, not_owner}</c> is returned.</p>
+          <c>{error, not_owner}</c> is returned. If the process identified
+          by <c><anno>Pid</anno></c> is not an existing local pid,
+          <c>{error, badarg}</c> is returned. <c>{error, badarg}</c> may also
+          be returned in some cases when <c><anno>Socket</anno></c> is closed
+          during the execution of this function.</p>
       </desc>
     </func>
 
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