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
|
/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2008 InspIRCd Development Team
* See: http://www.inspircd.org/wiki/index.php/Credits
*
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
#include "inspircd.h"
#include "exitcodes.h"
#include <sys/epoll.h>
#include "socketengines/socketengine_epoll.h"
#include <ulimit.h>
EPollEngine::EPollEngine(InspIRCd* Instance) : SocketEngine(Instance)
{
MAX_DESCRIPTORS = 0;
// This is not a maximum, just a hint at the eventual number of sockets that may be polled.
EngineHandle = epoll_create(GetMaxFds() / 4);
if (EngineHandle == -1)
{
ServerInstance->Logs->Log("SOCKET",DEFAULT, "ERROR: Could not initialize socket engine: %s", strerror(errno));
ServerInstance->Logs->Log("SOCKET",DEFAULT, "ERROR: Your kernel probably does not have the proper features. This is a fatal error, exiting now.");
printf("ERROR: Could not initialize socket engine: %s\n", strerror(errno));
printf("ERROR: Your kernel probably does not have the proper features. This is a fatal error, exiting now.\n");
ServerInstance->Exit(EXIT_STATUS_SOCKETENGINE);
}
CurrentSetSize = 0;
ref = new EventHandler* [GetMaxFds()];
events = new struct epoll_event[GetMaxFds()];
memset(ref, 0, GetMaxFds() * sizeof(EventHandler*));
}
EPollEngine::~EPollEngine()
{
this->Close(EngineHandle);
delete[] ref;
delete[] events;
}
bool EPollEngine::AddFd(EventHandler* eh)
{
int fd = eh->GetFd();
if ((fd < 0) || (fd > GetMaxFds() - 1))
{
ServerInstance->Logs->Log("SOCKET",DEBUG,"AddFd out of range: (fd: %d, max: %d)", fd, GetMaxFds());
return false;
}
if (GetRemainingFds() <= 1)
{
ServerInstance->Logs->Log("SOCKET",DEBUG,"No remaining FDs cannot add fd: %d", fd);
return false;
}
if (ref[fd])
{
ServerInstance->Logs->Log("SOCKET",DEBUG,"Attempt to add duplicate fd: %d", fd);
return false;
}
struct epoll_event ev;
memset(&ev,0,sizeof(ev));
eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
ev.data.fd = fd;
int i = epoll_ctl(EngineHandle, EPOLL_CTL_ADD, fd, &ev);
if (i < 0)
{
ServerInstance->Logs->Log("SOCKET",DEBUG,"Error adding fd: %d to socketengine: %s", fd, strerror(errno));
return false;
}
ServerInstance->Logs->Log("SOCKET",DEBUG,"New file descriptor: %d", fd);
ref[fd] = eh;
CurrentSetSize++;
return true;
}
void EPollEngine::WantWrite(EventHandler* eh)
{
/** Use oneshot so that the system removes the writeable
* status for us and saves us a call.
*/
struct epoll_event ev;
memset(&ev,0,sizeof(ev));
ev.events = EPOLLOUT;
ev.data.fd = eh->GetFd();
epoll_ctl(EngineHandle, EPOLL_CTL_MOD, eh->GetFd(), &ev);
}
bool EPollEngine::DelFd(EventHandler* eh, bool force)
{
int fd = eh->GetFd();
if ((fd < 0) || (fd > GetMaxFds() - 1))
{
ServerInstance->Logs->Log("SOCKET",DEBUG,"DelFd out of range: (fd: %d, max: %d)", fd, GetMaxFds());
return false;
}
struct epoll_event ev;
memset(&ev,0,sizeof(ev));
eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
ev.data.fd = fd;
int i = epoll_ctl(EngineHandle, EPOLL_CTL_DEL, fd, &ev);
if (i < 0 && !force)
{
ServerInstance->Logs->Log("SOCKET",DEBUG,"Cant remove socket: %s", strerror(errno));
return false;
}
ref[fd] = NULL;
CurrentSetSize--;
ServerInstance->Logs->Log("SOCKET",DEBUG,"Remove file descriptor: %d", fd);
return true;
}
int EPollEngine::GetMaxFds()
{
if (MAX_DESCRIPTORS)
return MAX_DESCRIPTORS;
int max = ulimit(4, 0);
if (max > 0)
{
MAX_DESCRIPTORS = max;
return max;
}
else
{
ServerInstance->Logs->Log("SOCKET", DEFAULT, "ERROR: Can't determine maximum number of open sockets!");
printf("ERROR: Can't determine maximum number of open sockets!\n");
ServerInstance->Exit(EXIT_STATUS_SOCKETENGINE);
}
return 0;
}
int EPollEngine::GetRemainingFds()
{
return GetMaxFds() - CurrentSetSize;
}
int EPollEngine::DispatchEvents()
{
socklen_t codesize = sizeof(int);
int errcode;
int i = epoll_wait(EngineHandle, events, GetMaxFds() - 1, 1000);
TotalEvents += i;
for (int j = 0; j < i; j++)
{
if (events[j].events & EPOLLHUP)
{
ErrorEvents++;
if (ref[events[j].data.fd])
ref[events[j].data.fd]->HandleEvent(EVENT_ERROR, 0);
continue;
}
if (events[j].events & EPOLLERR)
{
ErrorEvents++;
/* Get error number */
if (getsockopt(events[j].data.fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
errcode = errno;
if (ref[events[j].data.fd])
ref[events[j].data.fd]->HandleEvent(EVENT_ERROR, errcode);
continue;
}
if (events[j].events & EPOLLOUT)
{
WriteEvents++;
struct epoll_event ev;
memset(&ev,0,sizeof(ev));
ev.events = EPOLLIN;
ev.data.fd = events[j].data.fd;
epoll_ctl(EngineHandle, EPOLL_CTL_MOD, events[j].data.fd, &ev);
if (ref[events[j].data.fd])
ref[events[j].data.fd]->HandleEvent(EVENT_WRITE);
}
else
{
ReadEvents++;
if (ref[events[j].data.fd])
ref[events[j].data.fd]->HandleEvent(EVENT_READ);
}
}
return i;
}
std::string EPollEngine::GetName()
{
return "epoll";
}
|
