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File 0123-stdlib-Expand-io-docs-to-show-that-standard_io-is-gr.patch of Package erlang (Revision 459ea22809e09a8cdcc656806aa931bc)

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From 43f5e79f2ab72ff9d1dad8bec5a0f6b4b42606c5 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Tue, 18 May 2021 13:25:37 +0200
Subject: [PATCH 3/6] stdlib: Expand io docs to show that standard_io is group
 leader

This was previously not documented, but it is mentioned in a lot of
places that it is the group leader that all I/O is sent to by default.
So we can just as well make it explicit that standard_io is just an
alias for group_leader() and thus the target of standard_io is changed
when the group leader is changed.
---
 lib/stdlib/doc/src/io.xml | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/lib/stdlib/doc/src/io.xml b/lib/stdlib/doc/src/io.xml
index 9fd87d9cf1..99871c280b 100644
--- a/lib/stdlib/doc/src/io.xml
+++ b/lib/stdlib/doc/src/io.xml
@@ -36,10 +36,12 @@
       or exit if they are not.</p>
  
    <p>All functions in this module have an optional
-      parameter <c>IoDevice</c>. If included, it must be the pid of a
-      process that handles the I/O protocols. Normally, it is the
-      <c>IoDevice</c> returned by
-      <seemfa marker="kernel:file#open/2"><c>file:open/2</c></seemfa>.</p>
+     parameter <seetype marker="#device"><c>IoDevice</c></seetype>.
+     If included, it must be the pid of a process that handles the I/O
+     protocols. Normally, it is a <c>IoDevice</c> returned by
+     <seemfa marker="kernel:file#open/2"><c>file:open/2</c></seemfa>.
+     If no <seetype marker="#device"><c>IoDevice</c></seetype> is given,
+     <c>standard_io</c> is used.</p>
 
     <p>For a description of the I/O protocols, see section
       <seeguide marker="io_protocol">The Erlang I/O Protocol</seeguide>
@@ -71,7 +73,10 @@
       <desc>
         <p>An I/O device, either <c>standard_io</c>, <c>standard_error</c>, a
           registered name, or a pid handling I/O protocols (returned from
-          <seemfa marker="kernel:file#open/2"><c>file:open/2</c></seemfa>).
+          <seemfa marker="kernel:file#open/2"><c>file:open/2</c></seemfa>).</p>
+        <p>For more information about the built-in devices see
+          <seeerl marker="#standard-input-output">Standard Input/Output</seeerl>
+          and <seeerl marker="#standard-error">Standard Error</seeerl>.
         </p>
       </desc>
     </datatype>
@@ -1227,6 +1232,12 @@ enter><input>foo.</input>
 enter><input>bar.</input>
 {ok,bar}</pre>
 
+    <p><c>standard_io</c> is an alias for <seemfa marker="erts:erlang#group_leader/0"><c>
+      group_leader/0</c></seemfa>, so in order to change where the default input/output
+      requests are sent you can change the group leader using
+      <seemfa marker="erts:erlang#group_leader/2"><c>
+      group_leader(self(), NewGroupLeader).</c></seemfa></p>
+
     <p>There is always a process registered under the name of
       <c>user</c>. This can be used for sending output to the user.</p>
   </section>
-- 
2.26.2

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