File 0756-Improve-documentation-for-gen_tcp-recv-3.p... of Package erlang

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File 0756-Improve-documentation-for-gen_tcp-recv-3.patch of Package erlang (Revision a348a67ba66c7a948f8268ea2bae17d0)

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From 90df8acc3ec6ad769bc013722e78bb0353908ab2 Mon Sep 17 00:00:00 2001
From: Andrea leopardi <an.leopardi@gmail.com>
Date: Sun, 23 Apr 2023 15:21:54 +0200
Subject: [PATCH] Improve documentation for gen_tcp:recv/3

The first part of this patch only highlights the word "passive" in the
documentation for gen_tcp:recv/3, to emphasize that this function only
works in passive mode.

The second part adds a note saying that calling gen_tcp:recv/3 on
an active socket returns {error, einval}.

The last part of the patch adds a paragraph to the documentation for
gen_tcp:recv/3 mentioning what happens when multiple processes call
recv/3 on the same socket. This was previously not documented.
---
 lib/kernel/doc/src/gen_tcp.xml | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/lib/kernel/doc/src/gen_tcp.xml b/lib/kernel/doc/src/gen_tcp.xml
index e455cfdaf5..0aced6bfa8 100644
--- a/lib/kernel/doc/src/gen_tcp.xml
+++ b/lib/kernel/doc/src/gen_tcp.xml
@@ -539,9 +539,10 @@ do_recv(Sock, Bs) ->
 in ERTS.
 </type_desc>
 <desc>
- Receives a packet from a socket in passive
+ Receives a packet from a socket in passive
 mode. A closed socket is indicated by return value
- <c>{error, closed}</c>.
+ <c>{error, closed}</c>. If the socket is not in passive mode,
+ the return value is <c>{error, einval}</c>.
 Argument <c><anno>Length</anno></c> is only meaningful when
 the socket is in <c>raw</c> mode and denotes the number of
 bytes to read. If <c><anno>Length</anno></c> is <c>0</c>, all
@@ -552,6 +553,12 @@ do_recv(Sock, Bs) ->
 data when the socket is closed from the other side.
 The optional <c><anno>Timeout</anno></c> parameter specifies a
 time-out in milliseconds. Defaults to <c>infinity</c>.
+ Any process can receive data from a passive socket, even if that
+ process is not the controlling process of the socket. However,
+ only one process can call this function on a socket at any given time.
+ Using simultaneous calls to <c>recv</c> is not recommended as its behavior
+ is dependent on the socket implementation, and could return errors
+ such as <c>{error, ealready}</c>.
 </desc>
 </func>
 
-- 
2.35.3

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