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-rw-r--r--lib/kernel/doc/src/application.xml9
-rw-r--r--lib/kernel/src/application.erl16
-rw-r--r--lib/kernel/test/application_SUITE.erl13
3 files changed, 35 insertions, 3 deletions
diff --git a/lib/kernel/doc/src/application.xml b/lib/kernel/doc/src/application.xml
index 51a3311ec2..9f19efc793 100644
--- a/lib/kernel/doc/src/application.xml
+++ b/lib/kernel/doc/src/application.xml
@@ -121,6 +121,15 @@
</desc>
</func>
<func>
+ <name name="get_env" arity="3"/>
+ <fsummary>Get the value of a configuration parameter using a default</fsummary>
+ <desc>
+ <p>Works like <seealso marker="#get_env/2">get_env/2</seealso> but returns
+ <c><anno>Def</anno></c> value when configuration parameter
+ <c><anno>Par</anno></c> does not exist.</p>
+ </desc>
+ </func>
+ <func>
<name name="get_key" arity="1"/>
<name name="get_key" arity="2"/>
<fsummary>Get the value of an application specification key</fsummary>
diff --git a/lib/kernel/src/application.erl b/lib/kernel/src/application.erl
index 9b7c4aa7b8..4e65883be7 100644
--- a/lib/kernel/src/application.erl
+++ b/lib/kernel/src/application.erl
@@ -23,7 +23,7 @@
which_applications/0, which_applications/1,
loaded_applications/0, permit/2]).
-export([set_env/3, set_env/4, unset_env/2, unset_env/3]).
--export([get_env/1, get_env/2, get_all_env/0, get_all_env/1]).
+-export([get_env/1, get_env/2, get_env/3, get_all_env/0, get_all_env/1]).
-export([get_key/1, get_key/2, get_all_key/0, get_all_key/1]).
-export([get_application/0, get_application/1, info/0]).
-export([start_type/0]).
@@ -264,6 +264,20 @@ get_env(Key) ->
get_env(Application, Key) ->
application_controller:get_env(Application, Key).
+-spec get_env(Application, Par, Def) -> Val when
+ Application :: atom(),
+ Par :: atom(),
+ Def :: term(),
+ Val :: term().
+
+get_env(Application, Key, Def) ->
+ case get_env(Application, Key) of
+ {ok, Val} ->
+ Val;
+ undefined ->
+ Def
+ end.
+
-spec get_all_env() -> Env when
Env :: [{Par :: atom(), Val :: term()}].
diff --git a/lib/kernel/test/application_SUITE.erl b/lib/kernel/test/application_SUITE.erl
index f469a0af98..2ca8840e1f 100644
--- a/lib/kernel/test/application_SUITE.erl
+++ b/lib/kernel/test/application_SUITE.erl
@@ -27,7 +27,7 @@
otp_1586/1, otp_2078/1, otp_2012/1, otp_2718/1, otp_2973/1,
otp_3002/1, otp_3184/1, otp_4066/1, otp_4227/1, otp_5363/1,
otp_5606/1,
- start_phases/1, get_key/1,
+ start_phases/1, get_key/1, get_env/1,
permit_false_start_local/1, permit_false_start_dist/1, script_start/1,
nodedown_start/1, init2973/0, loop2973/0, loop5606/1]).
@@ -49,7 +49,7 @@ all() ->
[failover, failover_comp, permissions, load,
load_use_cache, {group, reported_bugs}, start_phases,
script_start, nodedown_start, permit_false_start_local,
- permit_false_start_dist, get_key,
+ permit_false_start_dist, get_key, get_env,
{group, distr_changed}, config_change, shutdown_func, shutdown_timeout].
groups() ->
@@ -1503,6 +1503,15 @@ loop5606(Pid) ->
Pid ! {self(), Res}
end.
+get_env(suite) -> [];
+get_env(doc) ->
+ ["Tests get_env/* functions"];
+get_env(Conf) when is_list(Conf) ->
+ {ok, _} = application:get_env(kernel, error_logger),
+ undefined = application:get_env(undefined_app, a),
+ undefined = application:get_env(kernel, error_logger_xyz),
+ default = application:get_env(kernel, error_logger_xyz, default),
+ ok.
%%-----------------------------------------------------------------
%% Should be started in a CC view with: