File 1682-Fix-bug-introduced-in-PR-6359.patch of Package erlang

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File 1682-Fix-bug-introduced-in-PR-6359.patch of Package erlang

From 5f9ac02065ae7a041b4a7ff360978af58c6827de Mon Sep 17 00:00:00 2001
From: Robin Morisset <rmorisset@fb.com>
Date: Thu, 1 Dec 2022 23:57:29 +0100
Subject: [PATCH] Fix bug introduced in PR 6359

In https://github.com/erlang/otp/pull/6359/files, I used the new
ets:lookup_element/4 in various places in the standard library.

In particular, I replaced a try/catch wrapping a call to
lookup_element/3 in 3 places. Unfortunately, this catch was also
catching the case where the table does not exist at all, and so now
things are breaking.

This patch just restores the 3 try/catches.
---
 lib/kernel/src/inet_db.erl |  7 ++++++-
 lib/kernel/src/pg.erl      | 14 ++++++++++++--
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/lib/kernel/src/inet_db.erl b/lib/kernel/src/inet_db.erl
index 4937bc0751..f792069a8b 100644
--- a/lib/kernel/src/inet_db.erl
+++ b/lib/kernel/src/inet_db.erl
@@ -579,7 +579,12 @@ res_update(Option, TagTm) ->
     end.
 
 db_get(Name) ->
-    ets:lookup_element(inet_db, Name, 2, undefined).
+    try
+        ets:lookup_element(inet_db, Name, 2, undefined)
+    catch
+        %% Case where the table does not exist yet.
+        error:badarg -> undefined
+    end.
 
 add_rr(RR) ->
     %% Questionable if we need to support this;
diff --git a/lib/kernel/src/pg.erl b/lib/kernel/src/pg.erl
index cc8631f419..deb5a16d28 100644
--- a/lib/kernel/src/pg.erl
+++ b/lib/kernel/src/pg.erl
@@ -203,7 +203,12 @@ get_members(Group) ->
 
 -spec get_members(Scope :: atom(), Group :: group()) -> [pid()].
 get_members(Scope, Group) ->
-    ets:lookup_element(Scope, Group, 2, []).
+    try
+        ets:lookup_element(Scope, Group, 2, [])
+    catch
+        %% Case where the table does not exist yet.
+        error:badarg -> []
+    end.
 
 %%--------------------------------------------------------------------
 %% @doc
@@ -214,7 +219,12 @@ get_local_members(Group) ->
 
 -spec get_local_members(Scope :: atom(), Group :: group()) -> [pid()].
 get_local_members(Scope, Group) ->
-    ets:lookup_element(Scope, Group, 3, []).
+    try
+        ets:lookup_element(Scope, Group, 3, [])
+    catch
+        %% Case where the table does not exist yet.
+        error:badarg -> []
+    end.
 
 %%--------------------------------------------------------------------
 %% @doc
-- 
2.35.3

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File 1682-Fix-bug-introduced-in-PR-6359.patch of Package erlang

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