diff options
Diffstat (limited to 'lib/dtrace/src/dtrace.erl')
| -rw-r--r-- | lib/dtrace/src/dtrace.erl | 38 |
1 files changed, 33 insertions, 5 deletions
diff --git a/lib/dtrace/src/dtrace.erl b/lib/dtrace/src/dtrace.erl index 45addafc53..6951c03215 100644 --- a/lib/dtrace/src/dtrace.erl +++ b/lib/dtrace/src/dtrace.erl @@ -14,8 +14,8 @@ %%% four integer arguments and four string arguments; the integer %%% argument(s) must come before any string argument. For example: %%% ``` -%%% 1> put(dtrace_utag, "GGOOOAAALL!!!!!"). -%%% undefined +%%% 1> dtrace:put_tag("GGOOOAAALL!!!!!"). +%%% true %%% 2> dtrace:init(). %%% ok %%% @@ -35,9 +35,13 @@ %%% then the driver will ignore the user's input and use a default %%% value of 0 or NULL, respectively. +-define(DTRACE_UT_KEY, '_dtrace_utag_@_@'). % Match prim_file:get_dtrace_utag()! + -export([init/0, available/0, user_trace_s1/1, % TODO: unify with pid & tag args like user_trace_i4s4 p/0, p/1, p/2, p/3, p/4, p/5, p/6, p/7, p/8]). +-export([put_utag/1, get_utag/0]). + -export([scaff/0]). % Development only -export([user_trace_i4s4/9]). % Know what you're doing! @@ -68,7 +72,7 @@ available() -> -spec user_trace_s1(iolist()) -> true | false | error | badarg. -user_trace_s1(Message) -> +user_trace_s1(_Message) -> erlang:nif_error(nif_not_loaded). -spec user_trace_i4s4(iolist(), @@ -176,8 +180,32 @@ p(I1, I2, I3, I4, S1, S2, S3, S4) when is_integer(I1), is_integer(I2), is_intege true | false | error | badarg. user_trace_int(I1, I2, I3, I4, S1, S2, S3, S4) -> - UTag = prim_file:get_dtrace_utag(), - user_trace_i4s4(UTag, I1, I2, I3, I4, S1, S2, S3, S4). + UTag = get_utag(), + try + user_trace_i4s4(UTag, I1, I2, I3, I4, S1, S2, S3, S4) + catch + error:nif_not_loaded -> + false + end. + +-spec put_utag(undefined | iolist()) -> ok. + +put_utag(undefined) -> + put_utag(<<>>); +put_utag(T) when is_binary(T) -> + put(?DTRACE_UT_KEY, T), + ok; +put_utag(T) when is_list(T) -> + put(?DTRACE_UT_KEY, list_to_binary(T)), + ok. + +get_utag() -> + case get(?DTRACE_UT_KEY) of + undefined -> + <<>>; + X -> + X + end. %% Scaffolding to write tedious code: quick brute force and not 100% correct. |