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
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_SOCKET_MONITOR_HXX
#define MPD_SOCKET_MONITOR_HXX
#include "check.h"
#ifdef USE_INTERNAL_EVENTLOOP
#include "PollGroup.hxx"
#endif
#ifdef USE_GLIB_EVENTLOOP
#include <glib.h>
#endif
#include <type_traits>
#include <assert.h>
#include <stddef.h>
#ifdef WIN32
/* ERROR is a WIN32 macro that poisons our namespace; this is a kludge
to allow us to use it anyway */
#ifdef ERROR
#undef ERROR
#endif
#endif
class EventLoop;
/**
* Monitor events on a socket. Call Schedule() to announce events
* you're interested in, or Cancel() to cancel your subscription. The
* #EventLoop will invoke virtual method OnSocketReady() as soon as
* any of the subscribed events are ready.
*/
class SocketMonitor {
#ifdef USE_GLIB_EVENTLOOP
struct Source {
GSource base;
SocketMonitor *monitor;
};
#endif
int fd;
EventLoop &loop;
#ifdef USE_INTERNAL_EVENTLOOP
/**
* A bit mask of events that is currently registered in the EventLoop.
*/
unsigned scheduled_flags;
#endif
#ifdef USE_GLIB_EVENTLOOP
Source *source;
GPollFD poll;
#endif
public:
#ifdef USE_INTERNAL_EVENTLOOP
static constexpr unsigned READ = PollGroup::READ;
static constexpr unsigned WRITE = PollGroup::WRITE;
static constexpr unsigned ERROR = PollGroup::ERROR;
static constexpr unsigned HANGUP = PollGroup::HANGUP;
#endif
#ifdef USE_GLIB_EVENTLOOP
static constexpr unsigned READ = G_IO_IN;
static constexpr unsigned WRITE = G_IO_OUT;
static constexpr unsigned ERROR = G_IO_ERR;
static constexpr unsigned HANGUP = G_IO_HUP;
#endif
typedef std::make_signed<size_t>::type ssize_t;
#ifdef USE_INTERNAL_EVENTLOOP
SocketMonitor(EventLoop &_loop)
:fd(-1), loop(_loop), scheduled_flags(0) {}
SocketMonitor(int _fd, EventLoop &_loop)
:fd(_fd), loop(_loop), scheduled_flags(0) {}
#endif
#ifdef USE_GLIB_EVENTLOOP
SocketMonitor(EventLoop &_loop)
:fd(-1), loop(_loop), source(nullptr) {}
SocketMonitor(int _fd, EventLoop &_loop);
#endif
~SocketMonitor();
EventLoop &GetEventLoop() {
return loop;
}
bool IsDefined() const {
return fd >= 0;
}
int Get() const {
assert(IsDefined());
return fd;
}
void Open(int _fd);
/**
* "Steal" the socket descriptor. This abandons the socket
* and puts the responsibility for closing it to the caller.
*/
int Steal();
/**
* Somebody has closed the socket. Unregister this object.
*/
void Abandon();
void Close();
unsigned GetScheduledFlags() const {
assert(IsDefined());
#ifdef USE_INTERNAL_EVENTLOOP
return scheduled_flags;
#endif
#ifdef USE_GLIB_EVENTLOOP
return poll.events;
#endif
}
void Schedule(unsigned flags);
void Cancel() {
Schedule(0);
}
void ScheduleRead() {
Schedule(GetScheduledFlags() | READ | HANGUP | ERROR);
}
void ScheduleWrite() {
Schedule(GetScheduledFlags() | WRITE);
}
void CancelRead() {
Schedule(GetScheduledFlags() & ~(READ|HANGUP|ERROR));
}
void CancelWrite() {
Schedule(GetScheduledFlags() & ~WRITE);
}
ssize_t Read(void *data, size_t length);
ssize_t Write(const void *data, size_t length);
protected:
/**
* @return false if the socket has been closed
*/
virtual bool OnSocketReady(unsigned flags) = 0;
public:
#ifdef USE_INTERNAL_EVENTLOOP
void Dispatch(unsigned flags);
#endif
#ifdef USE_GLIB_EVENTLOOP
/* GSource callbacks */
static gboolean Prepare(GSource *source, gint *timeout_r);
static gboolean Check(GSource *source);
static gboolean Dispatch(GSource *source, GSourceFunc callback,
gpointer user_data);
private:
bool Check() const {
assert(IsDefined());
return (poll.revents & poll.events) != 0;
}
void Dispatch() {
assert(IsDefined());
OnSocketReady(poll.revents & poll.events);
}
#endif
};
#endif
|
