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
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1999-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%%
%%-----------------------------------------------------------------
%% Purpose: Waiting in accept for new connections.
%%-----------------------------------------------------------------
-module(megaco_tcp_accept).
%%-----------------------------------------------------------------
%% Include files
%%-----------------------------------------------------------------
-include_lib("megaco/src/tcp/megaco_tcp.hrl").
-include_lib("megaco/src/app/megaco_internal.hrl").
-define(d1(F, A), ?d("~p " ++ F, [self()|A])).
-define(d2(F), ?d1(F, [])).
%%-----------------------------------------------------------------
%% External exports
%%-----------------------------------------------------------------
-export([
start_link/1
]).
%%-----------------------------------------------------------------
%% Internal exports
%%-----------------------------------------------------------------
-export([
net_accept/4
]).
%%-----------------------------------------------------------------
%% External interface functions
%%-----------------------------------------------------------------
%%-----------------------------------------------------------------
%% Func: start
%% Description: Starts the proces that makes the accept call.
%%-----------------------------------------------------------------
start_link({TcpRec, SupPid, Listen}) ->
Args = [TcpRec, SupPid, Listen, self()],
Pid = proc_lib:spawn_link(?MODULE, net_accept, Args),
{ok, Pid}.
%%-----------------------------------------------------------------
%% Internal Interface Functions
%%-----------------------------------------------------------------
%%-----------------------------------------------------------------
%% Func: net_accept
%% Description: Loop function which calls accept and
%% spawns a connection process when there is an initial
%% contact.
%%-----------------------------------------------------------------
net_accept(TcpRec, SupPid, ListenFd, Parent) ->
do_accept(TcpRec, SupPid, ListenFd),
net_accept(TcpRec, SupPid, ListenFd, Parent).
do_accept(Tcp, Sup, Fd) ->
case gen_tcp:accept(Fd) of
{ok, S} ->
?d1("do_accept -> accepted: "
"~n S: ~p", [S]),
case megaco_tcp:start_connection(Sup,
Tcp#megaco_tcp{socket = S}) of
{ok, Pid} ->
?d1("do_accept -> connection started"
"~n Pid: ~p", [Pid]),
case gen_tcp:controlling_process(S, Pid) of
ok ->
?d2("do_accept -> control transferred"),
ok;
{error, _Reason} ->
?d1("do_accept -> "
"failed changing controlling process: "
"n _Reason: ~p", [_Reason]),
tcp_clear(S),
gen_tcp:close(S)
end;
{error, _Reason} ->
?d1("do_accept -> failed starting connection: "
"~n _Reason: ~p", [_Reason]),
tcp_clear(S),
gen_tcp:close(S)
end;
{error, _Reason} ->
?d1("do_accept -> accept failed: "
"~n _Reason: ~p", [_Reason]),
ok
end.
tcp_clear(Socket) ->
receive
{tcp, Socket, _Data} ->
tcp_clear(Socket);
{tcp_closed, Socket} ->
tcp_clear(Socket);
{tcp_error, Socket} ->
tcp_clear(Socket)
after 0 ->
ok
end.
|
