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-rw-r--r--lib/kernel/test/file_SUITE.erl11
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/kernel/test/file_SUITE.erl b/lib/kernel/test/file_SUITE.erl
index 17c47f871d..ed4ae353f3 100644
--- a/lib/kernel/test/file_SUITE.erl
+++ b/lib/kernel/test/file_SUITE.erl
@@ -3329,6 +3329,17 @@ do_large_file(Config) ->
?line {ok,P} = ?FILE_MODULE:position(F, {eof,-L}),
?line {ok,Rs} = ?FILE_MODULE:read(F, L+1),
?line ok = ?FILE_MODULE:close(F),
+ %% Reopen the file with 'append'; used to fail on Windows causing
+ %% writes to go to the beginning of the file for files > 4GB.
+ ?line PL = P + L,
+ ?line PLL = PL + L,
+ ?line {ok,F1} = ?FILE_MODULE:open(Name, [raw,read,write,append]),
+ ?line ok = ?FILE_MODULE:write(F1, R),
+ ?line {ok,PLL} = ?FILE_MODULE:position(F1, {cur,0}),
+ ?line {ok,Rs} = ?FILE_MODULE:pread(F1, P, L),
+ ?line {ok,PL} = ?FILE_MODULE:position(F1, {eof,-L}),
+ ?line {ok,R} = ?FILE_MODULE:read(F1, L+1),
+ ?line ok = ?FILE_MODULE:close(F1),
%%
?line Mref = erlang:monitor(process, Deleter),
?line Deleter ! {Tester,done},