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authorHans Bolinder <[email protected]>2010-10-20 15:39:20 +0200
committerHans Bolinder <[email protected]>2010-10-21 09:49:46 +0200
commit32dd52d5b35793470930a2c7a7394316bca5abd4 (patch)
tree64d1a1b856b26c83c1fbb295daeafc7b1cd13b3a /lib/stdlib
parenteb75757a3c8f467a7f17c5be9b63c047cb4e98b5 (diff)
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Fix a bug concerning bchunk(), match() and select()
If a Dets table was closed after calling bchunk/2, match/1,3, match_object/1,3, or select/1,3 and then opened again, a subsequent call using the returned continuation would normally return a reply. This bug has fixed; now the call fails with reason 'badarg'.
Diffstat (limited to 'lib/stdlib')
-rw-r--r--lib/stdlib/src/dets.erl71
-rw-r--r--lib/stdlib/test/dets_SUITE.erl29
2 files changed, 63 insertions, 37 deletions
diff --git a/lib/stdlib/src/dets.erl b/lib/stdlib/src/dets.erl
index 4584b8184f..cf68958a9f 100644
--- a/lib/stdlib/src/dets.erl
+++ b/lib/stdlib/src/dets.erl
@@ -147,6 +147,7 @@
bin, % small chunk not consumed, or 'eof' at end-of-file
alloc, % the part of the file not yet scanned, mostly a binary
tab,
+ proc, % the pid of the Dets process
match_program % true | compiled_match_spec() | undefined
}).
@@ -208,8 +209,6 @@ all() ->
bchunk(Tab, start) ->
badarg(treq(Tab, {bchunk_init, Tab}), [Tab, start]);
-bchunk(Tab, #dets_cont{bin = eof, tab = Tab}) ->
- '$end_of_table';
bchunk(Tab, #dets_cont{what = bchunk, tab = Tab} = State) ->
badarg(treq(Tab, {bchunk, State}), [Tab, State]);
bchunk(Tab, Term) ->
@@ -722,11 +721,14 @@ init_chunk_match(Tab, Pat, What, N) when is_integer(N), N >= 0;
N =:= default ->
case compile_match_spec(What, Pat) of
{Spec, MP} ->
- case req(dets_server:get_pid(Tab), {match, MP, Spec, N}) of
+ Proc = dets_server:get_pid(Tab),
+ case req(Proc, {match, MP, Spec, N}) of
{done, L} ->
- {L, #dets_cont{tab = Tab, what = What, bin = eof}};
+ {L, #dets_cont{tab = Tab, proc = Proc, what = What,
+ bin = eof}};
{cont, State} ->
- chunk_match(State#dets_cont{what = What, tab = Tab});
+ chunk_match(State#dets_cont{what = What, tab = Tab,
+ proc = Proc});
Error ->
Error
end;
@@ -736,34 +738,28 @@ init_chunk_match(Tab, Pat, What, N) when is_integer(N), N >= 0;
init_chunk_match(_Tab, _Pat, _What, _) ->
badarg.
-chunk_match(State) ->
- case catch dets_server:get_pid(State#dets_cont.tab) of
- {'EXIT', _Reason} ->
- badarg;
- _Proc when State#dets_cont.bin =:= eof ->
- '$end_of_table';
- Proc ->
- case req(Proc, {match_init, State}) of
- {cont, {Bins, NewState}} ->
- MP = NewState#dets_cont.match_program,
- case catch do_foldl_bins(Bins, MP) of
- {'EXIT', _} ->
- case ets:is_compiled_ms(MP) of
- true ->
- Bad = dets_utils:bad_object(chunk_match,
- Bins),
- req(Proc, {corrupt, Bad});
- false ->
- badarg
- end;
- [] ->
- chunk_match(NewState);
- Terms ->
- {Terms, NewState}
- end;
- Error ->
- Error
- end
+chunk_match(#dets_cont{proc = Proc}=State) ->
+ case req(Proc, {match_init, State}) of
+ '$end_of_table'=Reply ->
+ Reply;
+ {cont, {Bins, NewState}} ->
+ MP = NewState#dets_cont.match_program,
+ case catch do_foldl_bins(Bins, MP) of
+ {'EXIT', _} ->
+ case ets:is_compiled_ms(MP) of
+ true ->
+ Bad = dets_utils:bad_object(chunk_match, Bins),
+ req(Proc, {corrupt, Bad});
+ false ->
+ badarg
+ end;
+ [] ->
+ chunk_match(NewState);
+ Terms ->
+ {Terms, NewState}
+ end;
+ Error ->
+ Error
end.
do_foldl_bins(Bins, true) ->
@@ -1578,13 +1574,18 @@ do_bchunk_init(Head, Tab) ->
L = dets_utils:all_allocated(H2),
C0 = #dets_cont{no_objs = default, bin = <<>>, alloc = L},
BinParms = term_to_binary(Parms),
- {H2, {C0#dets_cont{tab = Tab, what = bchunk}, [BinParms]}}
+ {H2, {C0#dets_cont{tab = Tab, proc = self(),what = bchunk},
+ [BinParms]}}
end;
{NewHead, _} = HeadError when is_record(NewHead, head) ->
HeadError
end.
%% -> {NewHead, {cont(), [binary()]}} | {NewHead, Error}
+do_bchunk(Head, #dets_cont{proc = Proc}) when Proc =/= self() ->
+ {Head, badarg};
+do_bchunk(Head, #dets_cont{bin = eof}) ->
+ {Head, '$end_of_table'};
do_bchunk(Head, State) ->
case dets_v9:read_bchunks(Head, State#dets_cont.alloc) of
{error, Reason} ->
@@ -1954,6 +1955,8 @@ flookup_keys(Head, Keys) ->
end.
%% -> {NewHead, Result}
+fmatch_init(Head, #dets_cont{bin = eof}) ->
+ {Head, '$end_of_table'};
fmatch_init(Head, C) ->
case scan(Head, C) of
{scan_error, Reason} ->
diff --git a/lib/stdlib/test/dets_SUITE.erl b/lib/stdlib/test/dets_SUITE.erl
index 760e610e00..3c938313b4 100644
--- a/lib/stdlib/test/dets_SUITE.erl
+++ b/lib/stdlib/test/dets_SUITE.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1996-2009. All Rights Reserved.
+%% Copyright Ericsson AB 1996-2010. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -50,7 +50,7 @@
otp_4208/1, otp_4989/1, many_clients/1, otp_4906/1, otp_5402/1,
simultaneous_open/1, insert_new/1, repair_continuation/1,
otp_5487/1, otp_6206/1, otp_6359/1, otp_4738/1, otp_7146/1,
- otp_8070/1]).
+ otp_8070/1, otp_8903/1]).
-export([dets_dirty_loop/0]).
@@ -108,7 +108,7 @@ all(suite) ->
cache_duplicate_bags_v9, otp_4208, otp_4989, many_clients,
otp_4906, otp_5402, simultaneous_open, insert_new,
repair_continuation, otp_5487, otp_6206, otp_6359, otp_4738,
- otp_7146, otp_8070]}
+ otp_7146, otp_8070, otp_8903]}
end.
not_run(suite) -> [];
@@ -3701,6 +3701,29 @@ otp_8070(Config) when is_list(Config) ->
file:delete(File),
ok.
+otp_8903(doc) ->
+ ["OTP-8903. bchunk/match/select bug."];
+otp_8903(suite) ->
+ [];
+otp_8903(Config) when is_list(Config) ->
+ Tab = otp_8903,
+ File = filename(Tab, Config),
+ ?line {ok,T} = dets:open_file(bug, [{file,File}]),
+ ?line ok = dets:insert(T, [{1,a},{2,b},{3,c}]),
+ ?line dets:safe_fixtable(T, true),
+ ?line {[_],C1} = dets:match_object(T, '_', 1),
+ ?line {BC1,_D} = dets:bchunk(T, start),
+ ?line ok = dets:close(T),
+ ?line {'EXIT', {badarg, _}} = (catch {foo,dets:match_object(C1)}),
+ ?line {'EXIT', {badarg, _}} = (catch {foo,dets:bchunk(T, BC1)}),
+ ?line {ok,T} = dets:open_file(bug, [{file,File}]),
+ ?line false = dets:info(T, safe_fixed),
+ ?line {'EXIT', {badarg, _}} = (catch {foo,dets:match_object(C1)}),
+ ?line {'EXIT', {badarg, _}} = (catch {foo,dets:bchunk(T, BC1)}),
+ ?line ok = dets:close(T),
+ file:delete(File),
+ ok.
+
%%
%% Parts common to several test cases
%%