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
|
/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2007-2008 Craig Edwards <craigedwards@brainbox.cc>
*
* This file is part of InspIRCd. InspIRCd 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, version 2.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
#include "socketengine.h"
#ifndef _WIN32
#include <sys/select.h>
#endif // _WIN32
/** A specialisation of the SocketEngine class, designed to use traditional select().
*/
class SelectEngine : public SocketEngine
{
fd_set ReadSet, WriteSet, ErrSet;
int MaxFD;
public:
/** Create a new SelectEngine
*/
SelectEngine();
/** Delete a SelectEngine
*/
virtual ~SelectEngine();
virtual bool AddFd(EventHandler* eh, int event_mask);
virtual void DelFd(EventHandler* eh);
void OnSetEvent(EventHandler* eh, int, int);
virtual int DispatchEvents();
virtual std::string GetName();
};
SelectEngine::SelectEngine()
{
MAX_DESCRIPTORS = FD_SETSIZE;
CurrentSetSize = 0;
ref = new EventHandler* [GetMaxFds()];
memset(ref, 0, GetMaxFds() * sizeof(EventHandler*));
FD_ZERO(&ReadSet);
FD_ZERO(&WriteSet);
FD_ZERO(&ErrSet);
MaxFD = 0;
}
SelectEngine::~SelectEngine()
{
delete[] ref;
}
bool SelectEngine::AddFd(EventHandler* eh, int event_mask)
{
int fd = eh->GetFd();
if ((fd < 0) || (fd > GetMaxFds() - 1))
return false;
if (ref[fd])
return false;
ref[fd] = eh;
SocketEngine::SetEventMask(eh, event_mask);
OnSetEvent(eh, 0, event_mask);
FD_SET(fd, &ErrSet);
if (fd > MaxFD)
MaxFD = fd;
CurrentSetSize++;
ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "New file descriptor: %d", fd);
return true;
}
void SelectEngine::DelFd(EventHandler* eh)
{
int fd = eh->GetFd();
if ((fd < 0) || (fd > GetMaxFds() - 1))
return;
CurrentSetSize--;
ref[fd] = NULL;
FD_CLR(fd, &ReadSet);
FD_CLR(fd, &WriteSet);
FD_CLR(fd, &ErrSet);
if (fd == MaxFD)
--MaxFD;
ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Remove file descriptor: %d", fd);
}
void SelectEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask)
{
int fd = eh->GetFd();
int diff = old_mask ^ new_mask;
if (diff & (FD_WANT_POLL_READ | FD_WANT_FAST_READ))
{
if (new_mask & (FD_WANT_POLL_READ | FD_WANT_FAST_READ))
FD_SET(fd, &ReadSet);
else
FD_CLR(fd, &ReadSet);
}
if (diff & (FD_WANT_POLL_WRITE | FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE))
{
if (new_mask & (FD_WANT_POLL_WRITE | FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE))
FD_SET(fd, &WriteSet);
else
FD_CLR(fd, &WriteSet);
}
}
int SelectEngine::DispatchEvents()
{
static timeval tval = { 1, 0 };
fd_set rfdset = ReadSet, wfdset = WriteSet, errfdset = ErrSet;
int sresult = select(MaxFD + 1, &rfdset, &wfdset, &errfdset, &tval);
ServerInstance->UpdateTime();
/* Nothing to process this time around */
if (sresult < 1)
return 0;
for (int i = 0, j = sresult; i <= MaxFD && j > 0; i++)
{
int has_read = FD_ISSET(i, &rfdset), has_write = FD_ISSET(i, &wfdset), has_error = FD_ISSET(i, &errfdset);
if (has_read || has_write || has_error)
{
--j;
EventHandler* ev = ref[i];
if (!ev)
continue;
if (has_error)
{
ErrorEvents++;
socklen_t codesize = sizeof(int);
int errcode = 0;
if (getsockopt(i, SOL_SOCKET, SO_ERROR, (char*)&errcode, &codesize) < 0)
errcode = errno;
ev->HandleEvent(EVENT_ERROR, errcode);
continue;
}
if (has_read)
{
ReadEvents++;
SetEventMask(ev, ev->GetEventMask() & ~FD_READ_WILL_BLOCK);
ev->HandleEvent(EVENT_READ);
if (ev != ref[i])
continue;
}
if (has_write)
{
WriteEvents++;
int newmask = (ev->GetEventMask() & ~(FD_WRITE_WILL_BLOCK | FD_WANT_SINGLE_WRITE));
this->OnSetEvent(ev, ev->GetEventMask(), newmask);
SetEventMask(ev, newmask);
ev->HandleEvent(EVENT_WRITE);
}
}
}
return sresult;
}
std::string SelectEngine::GetName()
{
return "select";
}
SocketEngine* CreateSocketEngine()
{
return new SelectEngine;
}
|
