File 4461-Include-the-error-reason-when-loading-a-ni... of Package erlang

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File 4461-Include-the-error-reason-when-loading-a-nif-fails.patch of Package erlang (Revision 398ccc0504fd5da76624139573e92e25)

Currently displaying revision 398ccc0504fd5da76624139573e92e25 , Show latest

From 8ff7b2f27acde48c6bf16e9713d1a3c09027dccf Mon Sep 17 00:00:00 2001
From: Dominic Letz <dominic@diode.io>
Date: Tue, 14 Sep 2021 11:41:00 +0200
Subject: [PATCH] Include the error reason when loading a nif fails

When a nifs `on_load` function returns a non-ok value loading fails today silently without showing the returned error reason.

This is especially sad when the `on_load` callback is calling `erlang:load_nif/2` as it lasts statement which many nif `on_load` callbacks do. `erlang:load_nif/2` typically returns quite helpful error tuples that help to identify the reasons for why the nif failed loading. This change makes the error message appear in the output and in debug messages when debugging is enabled.

```erlang
-on_load(init/0).

init() ->
    SoName = filename:join(code:priv_dir(?APPNAME), ?LIBNAME),
    erlang:load_nif(SoName, 0).
```
---
 erts/preloaded/src/init.erl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/erts/preloaded/src/init.erl b/erts/preloaded/src/init.erl
index 5b59a9d65f..42d6d6ea7b 100644
--- a/erts/preloaded/src/init.erl
+++ b/erts/preloaded/src/init.erl
@@ -1475,7 +1475,7 @@ run_on_load_handlers([M|Ms], Debug) ->
 	    erlang:finish_after_on_load(M, Keep),
 	    case Keep of
 		false ->
-		    Error = {on_load_function_failed,M},
+		    Error = {on_load_function_failed,M,OnLoadRes},
 		    debug(Debug, Error),
 		    exit(Error);
 		true ->
-- 
2.31.1

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File 4461-Include-the-error-reason-when-loading-a-nif-fails.patch of Package erlang (Revision 398ccc0504fd5da76624139573e92e25)

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