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-rw-r--r--lib/kernel/src/os.erl23
1 files changed, 18 insertions, 5 deletions
diff --git a/lib/kernel/src/os.erl b/lib/kernel/src/os.erl
index d1feae771d..f6769df585 100644
--- a/lib/kernel/src/os.erl
+++ b/lib/kernel/src/os.erl
@@ -24,7 +24,10 @@
-include("file.hrl").
--spec type() -> 'vxworks' | {'unix',atom()} | {'win32',atom()} | {'ose',atom()}.
+-spec type() -> vxworks | {Osfamily, Osname} when
+ Osfamily :: unix | win32,
+ Osname :: atom().
+
type() ->
case erlang:system_info(os_type) of
{vxworks, _} ->
@@ -32,18 +35,27 @@ type() ->
Else -> Else
end.
--spec version() -> string() | {non_neg_integer(),non_neg_integer(),non_neg_integer()}.
+-spec version() -> VersionString | {Major, Minor, Release} when
+ VersionString :: string(),
+ Major :: non_neg_integer(),
+ Minor :: non_neg_integer(),
+ Release :: non_neg_integer().
version() ->
erlang:system_info(os_version).
--spec find_executable(string()) -> string() | 'false'.
+-spec find_executable(Name) -> Filename | 'false' when
+ Name :: string(),
+ Filename :: string().
find_executable(Name) ->
case os:getenv("PATH") of
false -> find_executable(Name, []);
Path -> find_executable(Name, Path)
end.
--spec find_executable(string(), string()) -> string() | 'false'.
+-spec find_executable(Name, Path) -> Filename | 'false' when
+ Name :: string(),
+ Path :: string(),
+ Filename :: string().
find_executable(Name, Path) ->
Extensions = extensions(),
case filename:pathtype(Name) of
@@ -147,7 +159,8 @@ extensions() ->
end.
%% Executes the given command in the default shell for the operating system.
--spec cmd(atom() | string() | [string()]) -> string().
+-spec cmd(Command) -> string() when
+ Command :: atom() | io_lib:chars().
cmd(Cmd) ->
validate(Cmd),
case type() of