1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
-module(rabbit_os_signal_handler).
-behaviour(gen_event).
-export([start_link/0, init/1,
handle_event/2, handle_call/2, handle_info/2,
terminate/2]).
%%
%% API
%%
start_link() ->
rabbit_log:info("Swapping OS signal event handler (erl_signal_server) for our own"),
%% delete any previous incarnations, otherwise we would be accumulating
%% handlers
_ = gen_event:delete_handler(erl_signal_server, ?MODULE, []),
%% swap the standard OTP signal handler if there is one
ok = gen_event:swap_sup_handler(
erl_signal_server,
%% what to swap
{erl_signal_handler, []},
%% new event handler
{?MODULE, []}),
gen_event:start_link({local, ?MODULE}).
init(_) ->
{ok, #{}}.
handle_event(sigterm, State) ->
rabbit_log:info("Received a SIGTERM, will shut down gracefully"),
rabbit:stop_and_halt(),
{ok, State};
handle_event(sigquit, State) ->
rabbit_log:info("Received a SIGQUIT, will shut down gracefully"),
rabbit:stop_and_halt(),
{ok, State};
handle_event(sigusr1, State) ->
rabbit_log:info("Received a SIGUSR1, ignoring it"),
{ok, State};
handle_event(sigusr2, State) ->
rabbit_log:info("Received a SIGUSR2, ignoring it"),
{ok, State};
%% note: SIGHUP can/will be handled by shells and process managers
handle_event(sighup, State) ->
rabbit_log:info("Received a SIGHUP, ignoring it"),
{ok, State};
handle_event(Msg, S) ->
%% delegate all unknown events to the default OTP signal handler
erl_signal_handler:handle_event(Msg, S),
{ok, S}.
handle_info(_, State) ->
{ok, State}.
handle_call(_Request, State) ->
{ok, ok, State}.
terminate(_Args, _State) ->
ok.
|
