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-rw-r--r--erts/preloaded/src/prim_file.erl5
1 files changed, 4 insertions, 1 deletions
diff --git a/erts/preloaded/src/prim_file.erl b/erts/preloaded/src/prim_file.erl
index 2d177bf80e..7f24889bb2 100644
--- a/erts/preloaded/src/prim_file.erl
+++ b/erts/preloaded/src/prim_file.erl
@@ -116,9 +116,10 @@
-define(EFILE_MODE_READ_WRITE, 3).
-define(EFILE_MODE_APPEND, 4).
-define(EFILE_COMPRESSED, 8).
+-define(EFILE_MODE_EXCL, 16).
%% Use this mask to get just the mode bits to be passed to the driver.
--define(EFILE_MODE_MASK, 15).
+-define(EFILE_MODE_MASK, 31).
%% Seek modes for the driver's seek function.
-define(EFILE_SEEK_SET, 0).
@@ -958,6 +959,8 @@ open_mode([compressed|Rest], Mode, Portopts, Setopts) ->
open_mode([append|Rest], Mode, Portopts, Setopts) ->
open_mode(Rest, Mode bor ?EFILE_MODE_APPEND bor ?EFILE_MODE_WRITE,
Portopts, Setopts);
+open_mode([exclusive|Rest], Mode, Portopts, Setopts) ->
+ open_mode(Rest, Mode bor ?EFILE_MODE_EXCL, Portopts, Setopts);
open_mode([delayed_write|Rest], Mode, Portopts, Setopts) ->
open_mode([{delayed_write, 64*1024, 2000}|Rest], Mode,
Portopts, Setopts);