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
|
/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
* E-mail:
* <brain@chatspike.net>
* <Craig@chatspike.net>
*
* Written by Craig Edwards, Craig McLure, and others.
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
#include "inspircd.h"
#include <sys/select.h>
#include "socketengine_select.h"
SelectEngine::SelectEngine(InspIRCd* Instance) : SocketEngine(Instance)
{
ServerInstance->Log(DEBUG,"SelectEngine::SelectEngine()");
EngineHandle = 0;
CurrentSetSize = 0;
memset(writeable, 0, sizeof(writeable));
}
SelectEngine::~SelectEngine()
{
ServerInstance->Log(DEBUG,"SelectEngine::~SelectEngine()");
}
bool SelectEngine::AddFd(EventHandler* eh)
{
int fd = eh->GetFd();
if ((fd < 0) || (fd > MAX_DESCRIPTORS))
{
ServerInstance->Log(DEFAULT,"ERROR: FD of %d added above max of %d",fd,MAX_DESCRIPTORS);
return false;
}
if (GetRemainingFds() <= 1)
{
ServerInstance->Log(DEFAULT,"ERROR: System out of file descriptors!");
return false;
}
fds[fd] = fd;
if (ref[fd])
return false;
ref[fd] = eh;
ServerInstance->Log(DEBUG,"Add socket %d",fd);
CurrentSetSize++;
return true;
}
void SelectEngine::WantWrite(EventHandler* eh)
{
writeable[eh->GetFd()] = true;
}
bool SelectEngine::DelFd(EventHandler* eh)
{
int fd = eh->GetFd();
ServerInstance->Log(DEBUG,"SelectEngine::DelFd(%d)",fd);
if ((fd < 0) || (fd > MAX_DESCRIPTORS))
return false;
std::map<int,int>::iterator t = fds.find(fd);
if (t != fds.end())
{
fds.erase(t);
ServerInstance->Log(DEBUG,"Deleted fd %d",fd);
}
CurrentSetSize--;
ref[fd] = NULL;
return true;
}
int SelectEngine::GetMaxFds()
{
return FD_SETSIZE;
}
int SelectEngine::GetRemainingFds()
{
return FD_SETSIZE - CurrentSetSize;
}
int SelectEngine::DispatchEvents()
{
int result = 0;
timeval tval;
int sresult = 0;
EventHandler* ev[MAX_DESCRIPTORS];
FD_ZERO(&wfdset);
FD_ZERO(&rfdset);
FD_ZERO(&errfdset);
for (std::map<int,int>::iterator a = fds.begin(); a != fds.end(); a++)
{
if (ref[a->second]->Readable())
FD_SET (a->second, &rfdset);
else
FD_SET (a->second, &wfdset);
if (writeable[a->second])
FD_SET (a->second, &wfdset);
FD_SET (a->second, &errfdset);
}
tval.tv_sec = 0;
tval.tv_usec = 50L;
sresult = select(FD_SETSIZE, &rfdset, &wfdset, &errfdset, &tval);
if (sresult > 0)
{
for (std::map<int,int>::iterator a = fds.begin(); a != fds.end(); a++)
{
if ((FD_ISSET (a->second, &rfdset)) || (FD_ISSET (a->second, &wfdset)) || FD_ISSET (a->second, &errfdset))
{
ev[result++] = ref[a->second];
}
}
}
/** An event handler may remove its own descriptor from the list, therefore it is not
* safe to directly iterate over the list and dispatch events there with STL iterators.
* Thats a shame because it makes this code slower and more resource intensive, but maybe
* the user should stop using select(), as select() smells anyway.
*/
for (int i = 0; i < result; i++)
{
if (ev[i])
{
if (FD_ISSET (a->second, &errfdset))
{
if (ev[i])
ev[i]->HandleEvent(EVENT_ERROR, 0);
continue;
}
ServerInstance->Log(DEBUG,"Handle %s event on fd %d",writeable[ev[i]->GetFd()] || !ev[i]->Readable() ? "write" : "read", ev[i]->GetFd());
if (writeable[ev[i]->GetFd()])
{
if (ev[i])
ev[i]->HandleEvent(EVENT_WRITE);
writeable[ev[i]->GetFd()] = false;
}
else
{
if (ev[i])
ev[i]->HandleEvent(ev[i]->Readable() ? EVENT_READ : EVENT_WRITE);
}
}
}
return result;
}
std::string SelectEngine::GetName()
{
return "select";
}
|
