nickva commented on a change in pull request #761: Add a debugging utilities
for listing processes
URL: https://github.com/apache/couchdb/pull/761#discussion_r134821239
##########
File path: src/couch/src/couch_debug.erl
##########
@@ -50,3 +233,306 @@ opened_files_contains(FileNameFragment) ->
lists:filter(fun({_Port, _Pid, _Fd, Path}) ->
string:str(Path, FileNameFragment) > 0
end, couch_debug:opened_files()).
+
+process_name(Pid) ->
+ case process_info(Pid, registered_name) of
+ {registered_name, Name} ->
+ iolist_to_list(io_lib:format("~s[~p]", [Name, Pid]));
+ _ ->
+ {dictionary, Dict} = process_info(Pid, dictionary),
+ case proplists:get_value('$initial_call', Dict) of
+ undefined ->
+ {initial_call, {M, F, A}} = process_info(Pid,
initial_call),
+ iolist_to_list(io_lib:format("~p:~p/~p[~p]", [M, F, A,
Pid]));
+ {M, F, A} ->
+ iolist_to_list(io_lib:format("~p:~p/~p[~p]", [M, F, A,
Pid]))
+ end
+ end.
+
+iolist_to_list(List) ->
+ binary_to_list(iolist_to_binary(List)).
+
+link_tree(RootPid) ->
+ link_tree(RootPid, []).
+
+link_tree(RootPid, Info) ->
+ link_tree(RootPid, Info, fun(_, Props) -> Props end).
+
+link_tree(RootPid, Info, Fun) ->
+ {_, Result} = link_tree(
+ RootPid, [links | Info], gb_trees:empty(), 0, [RootPid], Fun),
+ Result.
+
+link_tree(RootPid, Info, Visited0, Pos, [Pid | Rest], Fun) ->
+ case gb_trees:lookup(Pid, Visited0) of
+ {value, Props} ->
+ {Visited0, [{Pos, {Pid, Fun(Pid, Props), []}}]};
+ none when RootPid =< Pid ->
+ Props = info(Pid, Info),
+ Visited1 = gb_trees:insert(Pid, Props, Visited0),
+ {links, Children} = lists:keyfind(links, 1, Props),
+ {Visited2, NewTree} = link_tree(
+ RootPid, Info, Visited1, Pos + 1, Children, Fun),
+ {Visited3, Result} = link_tree(
+ RootPid, Info, Visited2, Pos, Rest, Fun),
+ {Visited3, [{Pos, {Pid, Fun(Pid, Props), NewTree}}] ++ Result};
+ none ->
+ Props = info(Pid, Info),
+ Visited1 = gb_trees:insert(Pid, Props, Visited0),
+ {Visited2, Result} = link_tree(
+ RootPid, Info, Visited1, Pos, Rest, Fun),
+ {Visited2, [{Pos, {Pid, Fun(Pid, Props), []}}] ++ Result}
+ end;
+link_tree(_RootPid, _Info, Visited, _Pos, [], _Fun) ->
+ {Visited, []}.
+
+
+info(Pid, Info) when is_pid(Pid) ->
+ ValidProps = [
+ backtrace,
+ binary,
+ catchlevel,
+ current_function,
+ current_location,
+ current_stacktrace,
+ dictionary,
+ error_handler,
+ garbage_collection,
+ garbage_collection_info,
+ group_leader,
+ heap_size,
+ initial_call,
+ links,
+ last_calls,
+ memory,
+ message_queue_len,
+ messages,
+ min_heap_size,
+ min_bin_vheap_size,
+ monitored_by,
+ monitors,
+ message_queue_data,
+ priority,
+ reductions,
+ registered_name,
+ sequential_trace_token,
+ stack_size,
+ status,
+ suspending,
+ total_heap_size,
+ trace,
+ trap_exit
+ ],
+ Validated = lists:filter(fun(P) -> lists:member(P, ValidProps) end, Info),
+ process_info(Pid, lists:usort(Validated));
+info(Port, Info) when is_port(Port) ->
+ ValidProps = [
+ registered_name,
+ id,
+ connected,
+ links,
+ name,
+ input,
+ output,
+ os_pid
+ ],
+ Validated = lists:filter(fun(P) -> lists:member(P, ValidProps) end, Info),
+ erlang:port_info(Port, lists:usort(Validated)).
Review comment:
I think we want something like ` [erlang:port_info(Port,Prop) || Prop <-
Validated]`
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
With regards,
Apache Git Services
