| Author |
Message |
< Erlang patches mailing list ~ gen_server:format_status/2 only works with registered proces |
| vances at motivity.ca |
 Posted: Thu Mar 20, 2003 11:05 pm |
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Guest
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OK, I found the problem. The following patch to lists.erl does it:
*** lists.erl.dist Thu Mar 20 17:56:16 2003
--- lists.erl Thu Mar 20 17:58:26 2003
***************
*** 280,285 ****
--- 280,286 ----
thing_to_list(X) when integer(X) -> integer_to_list(X);
thing_to_list(X) when float(X) -> float_to_list(X);
thing_to_list(X) when atom(X) -> atom_to_list(X);
+ thing_to_list(X) when pid(X) -> pid_to_list(X);
thing_to_list(X) when list(X) -> X. %Assumed to be a string
%% flatten(List)
-Vance
Vance Shipley
Motivity Telecom Inc.
+1 519 240 3684
vances_at_motivity.ca
On Thu, Mar 20, 2003 at 04:36:04PM -0500, Vance Shipley wrote:
}
} Now the problem is that, at least in R9B-[0|1], this only works if the
} process is registered! In the following example I am peeking at a
} couple gen_server processes the system runs. I am referring to each
} by PID but the process which is not registerd fails.
...
} Error in process <0.25.0> with exit value: {function_clause,[{lists,thing_to_list,[<0.23.0>]},{lists,flatmap,2},{gen_server,format_status,2},{erl_eval,expr,3},{erl_eval,exprs,4},{shell,eval_loop,2}]}
}
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| raimo.niskanen at uab.eri |
| Posted: Mon Mar 24, 2003 12:52 pm |
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Guest
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Vance Shipley wrote:
> OK, I found the problem. The following patch to lists.erl does it:
>
> *** lists.erl.dist Thu Mar 20 17:56:16 2003
> --- lists.erl Thu Mar 20 17:58:26 2003
> ***************
> *** 280,285 ****
> --- 280,286 ----
> thing_to_list(X) when integer(X) -> integer_to_list(X);
> thing_to_list(X) when float(X) -> float_to_list(X);
> thing_to_list(X) when atom(X) -> atom_to_list(X);
> + thing_to_list(X) when pid(X) -> pid_to_list(X);
> thing_to_list(X) when list(X) -> X. %Assumed to be a string
>
> %% flatten(List)
>
I am sorry, I do not think that is the correct(tm) solution. It seems
that lists:thing_to_list/1 handles items that look the same in a
parseable Erlang source file as when printed. Some types that are
missing are: pid(), port(), reference(), all not parseable from their
string representation.
So I think it is gen_server:format_status/2 that is faulty, trying to
call lists:concat/1 with a pid(). See the diff following.
/ Raimo Niskanen, Erlang/OTP
Note that the following diff might not patch as it is since it is not
from the R9B-1 version of the file.
***************
*** 670,676 ****
%%-----------------------------------------------------------------
format_status(Opt, StatusData) ->
[PDict, SysState, Parent, Debug, [Name, State, Mod, _Time]] =
StatusData,
! Header = lists:concat(["Status for generic server ", Name]),
Log = sys:get_debug(log, Debug, []),
Specfic =
case erlang:function_exported(Mod, format_status, 2) of
--- 670,681 ----
%%-----------------------------------------------------------------
format_status(Opt, StatusData) ->
[PDict, SysState, Parent, Debug, [Name, State, Mod, _Time]] =
StatusData,
! NameTag = if pid(Name) ->
! pid_to_list(Name);
! atom(Name) ->
! Name
! end,
! Header = lists:concat(["Status for generic server ", NameTag]),
Log = sys:get_debug(log, Debug, []),
Specfic =
case erlang:function_exported(Mod, format_status, 2) of
>
>
> -Vance
>
> Vance Shipley
> Motivity Telecom Inc.
> +1 519 240 3684
> vances_at_motivity.ca
>
> On Thu, Mar 20, 2003 at 04:36:04PM -0500, Vance Shipley wrote:
> }
> } Now the problem is that, at least in R9B-[0|1], this only works if the
> } process is registered! In the following example I am peeking at a
> } couple gen_server processes the system runs. I am referring to each
> } by PID but the process which is not registerd fails.
> ...
> } Error in process <0.25.0> with exit value: {function_clause,[{lists,thing_to_list,[<0.23.0>]},{lists,flatmap,2},{gen_server,format_status,2},{erl_eval,expr,3},{erl_eval,exprs,4},{shell,eval_loop,2}]}
> }
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