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/>.
22 #include "exitcodes.h"
24 #include <sys/epoll.h>
25 #include <sys/resource.h>
28 /** A specialisation of the SocketEngine class, designed to use linux 2.6 epoll().
34 /** These are used by epoll() to hold socket events
36 std::vector<struct epoll_event> events(1);
39 void SocketEngine::Init()
43 // 128 is not a maximum, just a hint at the eventual number of sockets that may be polled,
44 // and it is completely ignored by 2.6.8 and later kernels, except it must be larger than zero.
45 EngineHandle = epoll_create(128);
47 if (EngineHandle == -1)
49 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: Could not initialize socket engine: %s", strerror(errno));
50 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: Your kernel probably does not have the proper features. This is a fatal error, exiting now.");
51 std::cout << "ERROR: Could not initialize epoll socket engine: " << strerror(errno) << std::endl;
52 std::cout << "ERROR: Your kernel probably does not have the proper features. This is a fatal error, exiting now." << std::endl;
53 ServerInstance->QuickExit(EXIT_STATUS_SOCKETENGINE);
57 void SocketEngine::RecoverFromFork()
61 void SocketEngine::Deinit()
66 static unsigned mask_to_epoll(int event_mask)
69 if (event_mask & (FD_WANT_POLL_READ | FD_WANT_POLL_WRITE | FD_WANT_SINGLE_WRITE))
71 // we need to use standard polling on this FD
72 if (event_mask & (FD_WANT_POLL_READ | FD_WANT_FAST_READ))
74 if (event_mask & (FD_WANT_POLL_WRITE | FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE))
79 // we can use edge-triggered polling on this FD
81 if (event_mask & (FD_WANT_FAST_READ | FD_WANT_EDGE_READ))
83 if (event_mask & (FD_WANT_FAST_WRITE | FD_WANT_EDGE_WRITE))
89 bool SocketEngine::AddFd(EventHandler* eh, int event_mask)
94 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "AddFd out of range: (fd: %d)", fd);
98 if (!SocketEngine::AddFdRef(eh))
100 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Attempt to add duplicate fd: %d", fd);
104 struct epoll_event ev;
105 memset(&ev, 0, sizeof(ev));
106 ev.events = mask_to_epoll(event_mask);
107 ev.data.ptr = static_cast<void*>(eh);
108 int i = epoll_ctl(EngineHandle, EPOLL_CTL_ADD, fd, &ev);
111 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Error adding fd: %d to socketengine: %s", fd, strerror(errno));
115 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "New file descriptor: %d", fd);
117 eh->SetEventMask(event_mask);
118 ResizeDouble(events);
123 void SocketEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask)
125 unsigned old_events = mask_to_epoll(old_mask);
126 unsigned new_events = mask_to_epoll(new_mask);
127 if (old_events != new_events)
129 // ok, we actually have something to tell the kernel about
130 struct epoll_event ev;
131 memset(&ev, 0, sizeof(ev));
132 ev.events = new_events;
133 ev.data.ptr = static_cast<void*>(eh);
134 epoll_ctl(EngineHandle, EPOLL_CTL_MOD, eh->GetFd(), &ev);
138 void SocketEngine::DelFd(EventHandler* eh)
140 int fd = eh->GetFd();
143 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DelFd out of range: (fd: %d)", fd);
147 // Do not initialize epoll_event because for EPOLL_CTL_DEL operations the event is ignored and can be NULL.
148 // In kernel versions before 2.6.9, the EPOLL_CTL_DEL operation required a non-NULL pointer in event,
149 // even though this argument is ignored. Since Linux 2.6.9, event can be specified as NULL when using EPOLL_CTL_DEL.
150 struct epoll_event ev;
151 int i = epoll_ctl(EngineHandle, EPOLL_CTL_DEL, fd, &ev);
155 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "epoll_ctl can't remove socket: %s", strerror(errno));
158 SocketEngine::DelFdRef(eh);
160 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Remove file descriptor: %d", fd);
163 int SocketEngine::DispatchEvents()
165 int i = epoll_wait(EngineHandle, &events[0], events.size(), 1000);
166 ServerInstance->UpdateTime();
168 stats.TotalEvents += i;
170 for (int j = 0; j < i; j++)
172 // Copy these in case the vector gets resized and ev invalidated
173 const epoll_event ev = events[j];
175 EventHandler* const eh = static_cast<EventHandler*>(ev.data.ptr);
176 const int fd = eh->GetFd();
180 if (ev.events & EPOLLHUP)
183 eh->OnEventHandlerError(0);
187 if (ev.events & EPOLLERR)
190 /* Get error number */
191 socklen_t codesize = sizeof(int);
193 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
195 eh->OnEventHandlerError(errcode);
199 int mask = eh->GetEventMask();
200 if (ev.events & EPOLLIN)
201 mask &= ~FD_READ_WILL_BLOCK;
202 if (ev.events & EPOLLOUT)
204 mask &= ~FD_WRITE_WILL_BLOCK;
205 if (mask & FD_WANT_SINGLE_WRITE)
207 int nm = mask & ~FD_WANT_SINGLE_WRITE;
208 OnSetEvent(eh, mask, nm);
212 eh->SetEventMask(mask);
213 if (ev.events & EPOLLIN)
215 eh->OnEventHandlerRead();
216 if (eh != GetRef(fd))
217 // whoa! we got deleted, better not give out the write event
220 if (ev.events & EPOLLOUT)
222 eh->OnEventHandlerWrite();