2 * InspIRCd -- Internet Relay Chat Daemon
4 * Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
5 * Copyright (C) 2007-2008 Craig Edwards <craigedwards@brainbox.cc>
7 * This file is part of InspIRCd. InspIRCd is free software: you can
8 * redistribute it and/or modify it under the terms of the GNU General Public
9 * License as published by the Free Software Foundation, version 2.
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "exitcodes.h"
26 #include "socketengine.h"
27 #include <sys/epoll.h>
32 /** A specialisation of the SocketEngine class, designed to use linux 2.6 epoll().
38 /** These are used by epoll() to hold socket events
40 std::vector<struct epoll_event> events(1);
43 void SocketEngine::Init()
45 int max = ulimit(4, 0);
48 MAX_DESCRIPTORS = max;
52 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: Can't determine maximum number of open sockets!");
53 std::cout << "ERROR: Can't determine maximum number of open sockets!" << std::endl;
54 ServerInstance->QuickExit(EXIT_STATUS_SOCKETENGINE);
57 // This is not a maximum, just a hint at the eventual number of sockets that may be polled.
58 EngineHandle = epoll_create(GetMaxFds() / 4);
60 if (EngineHandle == -1)
62 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: Could not initialize socket engine: %s", strerror(errno));
63 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: Your kernel probably does not have the proper features. This is a fatal error, exiting now.");
64 std::cout << "ERROR: Could not initialize epoll socket engine: " << strerror(errno) << std::endl;
65 std::cout << "ERROR: Your kernel probably does not have the proper features. This is a fatal error, exiting now." << std::endl;
66 ServerInstance->QuickExit(EXIT_STATUS_SOCKETENGINE);
70 void SocketEngine::RecoverFromFork()
74 void SocketEngine::Deinit()
79 static unsigned mask_to_epoll(int event_mask)
82 if (event_mask & (FD_WANT_POLL_READ | FD_WANT_POLL_WRITE | FD_WANT_SINGLE_WRITE))
84 // we need to use standard polling on this FD
85 if (event_mask & (FD_WANT_POLL_READ | FD_WANT_FAST_READ))
87 if (event_mask & (FD_WANT_POLL_WRITE | FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE))
92 // we can use edge-triggered polling on this FD
94 if (event_mask & (FD_WANT_FAST_READ | FD_WANT_EDGE_READ))
96 if (event_mask & (FD_WANT_FAST_WRITE | FD_WANT_EDGE_WRITE))
102 bool SocketEngine::AddFd(EventHandler* eh, int event_mask)
104 int fd = eh->GetFd();
105 if ((fd < 0) || (fd > GetMaxFds() - 1))
107 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "AddFd out of range: (fd: %d, max: %d)", fd, GetMaxFds());
111 if (!SocketEngine::AddFdRef(eh))
113 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Attempt to add duplicate fd: %d", fd);
117 struct epoll_event ev;
118 memset(&ev, 0, sizeof(ev));
119 ev.events = mask_to_epoll(event_mask);
120 ev.data.ptr = static_cast<void*>(eh);
121 int i = epoll_ctl(EngineHandle, EPOLL_CTL_ADD, fd, &ev);
124 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Error adding fd: %d to socketengine: %s", fd, strerror(errno));
128 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "New file descriptor: %d", fd);
130 eh->SetEventMask(event_mask);
131 ResizeDouble(events);
136 void SocketEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask)
138 unsigned old_events = mask_to_epoll(old_mask);
139 unsigned new_events = mask_to_epoll(new_mask);
140 if (old_events != new_events)
142 // ok, we actually have something to tell the kernel about
143 struct epoll_event ev;
144 memset(&ev, 0, sizeof(ev));
145 ev.events = new_events;
146 ev.data.ptr = static_cast<void*>(eh);
147 epoll_ctl(EngineHandle, EPOLL_CTL_MOD, eh->GetFd(), &ev);
151 void SocketEngine::DelFd(EventHandler* eh)
153 int fd = eh->GetFd();
154 if ((fd < 0) || (fd > GetMaxFds() - 1))
156 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DelFd out of range: (fd: %d, max: %d)", fd, GetMaxFds());
160 // Do not initialize epoll_event because for EPOLL_CTL_DEL operations the event is ignored and can be NULL.
161 // In kernel versions before 2.6.9, the EPOLL_CTL_DEL operation required a non-NULL pointer in event,
162 // even though this argument is ignored. Since Linux 2.6.9, event can be specified as NULL when using EPOLL_CTL_DEL.
163 struct epoll_event ev;
164 int i = epoll_ctl(EngineHandle, EPOLL_CTL_DEL, fd, &ev);
168 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "epoll_ctl can't remove socket: %s", strerror(errno));
171 SocketEngine::DelFdRef(eh);
173 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Remove file descriptor: %d", fd);
176 int SocketEngine::DispatchEvents()
178 int i = epoll_wait(EngineHandle, &events[0], events.size(), 1000);
179 ServerInstance->UpdateTime();
181 stats.TotalEvents += i;
183 for (int j = 0; j < i; j++)
185 // Copy these in case the vector gets resized and ev invalidated
186 const epoll_event ev = events[j];
188 EventHandler* const eh = static_cast<EventHandler*>(ev.data.ptr);
189 const int fd = eh->GetFd();
193 if (ev.events & EPOLLHUP)
196 eh->HandleEvent(EVENT_ERROR, 0);
200 if (ev.events & EPOLLERR)
203 /* Get error number */
204 socklen_t codesize = sizeof(int);
206 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
208 eh->HandleEvent(EVENT_ERROR, errcode);
212 int mask = eh->GetEventMask();
213 if (ev.events & EPOLLIN)
214 mask &= ~FD_READ_WILL_BLOCK;
215 if (ev.events & EPOLLOUT)
217 mask &= ~FD_WRITE_WILL_BLOCK;
218 if (mask & FD_WANT_SINGLE_WRITE)
220 int nm = mask & ~FD_WANT_SINGLE_WRITE;
221 OnSetEvent(eh, mask, nm);
225 eh->SetEventMask(mask);
226 if (ev.events & EPOLLIN)
229 eh->HandleEvent(EVENT_READ);
230 if (eh != GetRef(fd))
231 // whoa! we got deleted, better not give out the write event
234 if (ev.events & EPOLLOUT)
237 eh->HandleEvent(EVENT_WRITE);