这里有一个简单的技巧：

Trace = try throw(42) catch 42 -> erlang:get_stacktrace() end,
erlang:display(Trace)

This might work:

where_am_i() ->
    try throw(a)
    catch throw:a:Stacktrace ->
            Stacktrace
    end.

Except that it doesn't work for tail calls. For example, given these two functions:

foo() ->
    where_am_i().

bar() ->
    X = where_am_i(),
    {ok, X}.

I get these results:

4> foo:foo().
[{foo,where_am_i,0},
 {erl_eval,do_apply,5},
 {shell,exprs,6},
 {shell,eval_exprs,6},
 {shell,eval_loop,3}]
5> foo:bar().
{ok,[{foo,where_am_i,0},
     {foo,bar,0},
     {erl_eval,do_apply,5},
     {shell,exprs,6},
     {shell,eval_exprs,6},
     {shell,eval_loop,3}]}

That is, I can only see bar , since foo 's call frame has been left already when where_am_i is called.

io:format("~s~n", [element(2, process_info(self(), backtrace))]).

self（）可以被任何其他pid代替（rpc：pinfo甚至可以和远程procs一起工作）。2如果你甚至不能修改源或光束，这会很有帮助。

下面是我的代码：

format_stack_entry(S) ->
    {Module,Fun,Arity,[{file,File},{line,Line}]}=S,
    io_lib:format("{~p,~p,~p,[{file,~p},{line,~p]}",[Module,Fun,Arity,File,Line]).
stacktop([Top|_]) ->
    Top.
ancestor(N) ->
    {_,Stacktrace}=erlang:process_info(self(),current_stacktrace),
    ancestor(N+1,Stacktrace).
ancestor(1,S) ->
    format_stack_entry(stacktop(S));
ancestor(N,[_|T]) ->
    ancestor(N-1,T).

info(Format)      -> io:format(lists:concat([ancestor(2),Format,"\r"])).
info(Format,Args) -> io:format(lists:concat([ancestor(2),Format,"\r"]),Args).

列表是系统中的自定义模块。请使用您的foo模块。