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/>.
23 #include <sys/epoll.h>
24 #include <sys/resource.h>
26 /** A specialisation of the SocketEngine class, designed to use linux 2.6 epoll().
32 /** These are used by epoll() to hold socket events
34 std::vector<struct epoll_event> events(1);
37 void SocketEngine::Init()
41 // 128 is not a maximum, just a hint at the eventual number of sockets that may be polled,
42 // and it is completely ignored by 2.6.8 and later kernels, except it must be larger than zero.
43 EngineHandle = epoll_create(128);
44 if (EngineHandle == -1)
48 void SocketEngine::RecoverFromFork()
52 void SocketEngine::Deinit()
57 static unsigned mask_to_epoll(int event_mask)
60 if (event_mask & (FD_WANT_POLL_READ | FD_WANT_POLL_WRITE | FD_WANT_SINGLE_WRITE))
62 // we need to use standard polling on this FD
63 if (event_mask & (FD_WANT_POLL_READ | FD_WANT_FAST_READ))
65 if (event_mask & (FD_WANT_POLL_WRITE | FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE))
70 // we can use edge-triggered polling on this FD
72 if (event_mask & (FD_WANT_FAST_READ | FD_WANT_EDGE_READ))
74 if (event_mask & (FD_WANT_FAST_WRITE | FD_WANT_EDGE_WRITE))
80 bool SocketEngine::AddFd(EventHandler* eh, int event_mask)
85 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "AddFd out of range: (fd: %d)", fd);
89 if (!SocketEngine::AddFdRef(eh))
91 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Attempt to add duplicate fd: %d", fd);
95 struct epoll_event ev;
96 memset(&ev, 0, sizeof(ev));
97 ev.events = mask_to_epoll(event_mask);
98 ev.data.ptr = static_cast<void*>(eh);
99 int i = epoll_ctl(EngineHandle, EPOLL_CTL_ADD, fd, &ev);
102 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Error adding fd: %d to socketengine: %s", fd, strerror(errno));
106 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "New file descriptor: %d", fd);
108 eh->SetEventMask(event_mask);
109 ResizeDouble(events);
114 void SocketEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask)
116 unsigned old_events = mask_to_epoll(old_mask);
117 unsigned new_events = mask_to_epoll(new_mask);
118 if (old_events != new_events)
120 // ok, we actually have something to tell the kernel about
121 struct epoll_event ev;
122 memset(&ev, 0, sizeof(ev));
123 ev.events = new_events;
124 ev.data.ptr = static_cast<void*>(eh);
125 epoll_ctl(EngineHandle, EPOLL_CTL_MOD, eh->GetFd(), &ev);
129 void SocketEngine::DelFd(EventHandler* eh)
131 int fd = eh->GetFd();
134 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DelFd out of range: (fd: %d)", fd);
138 // Do not initialize epoll_event because for EPOLL_CTL_DEL operations the event is ignored and can be NULL.
139 // In kernel versions before 2.6.9, the EPOLL_CTL_DEL operation required a non-NULL pointer in event,
140 // even though this argument is ignored. Since Linux 2.6.9, event can be specified as NULL when using EPOLL_CTL_DEL.
141 struct epoll_event ev;
142 int i = epoll_ctl(EngineHandle, EPOLL_CTL_DEL, fd, &ev);
146 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "epoll_ctl can't remove socket: %s", strerror(errno));
149 SocketEngine::DelFdRef(eh);
151 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Remove file descriptor: %d", fd);
154 int SocketEngine::DispatchEvents()
156 int i = epoll_wait(EngineHandle, &events[0], events.size(), 1000);
157 ServerInstance->UpdateTime();
159 stats.TotalEvents += i;
161 for (int j = 0; j < i; j++)
163 // Copy these in case the vector gets resized and ev invalidated
164 const epoll_event ev = events[j];
166 EventHandler* const eh = static_cast<EventHandler*>(ev.data.ptr);
167 const int fd = eh->GetFd();
171 if (ev.events & EPOLLHUP)
174 eh->OnEventHandlerError(0);
178 if (ev.events & EPOLLERR)
181 /* Get error number */
182 socklen_t codesize = sizeof(int);
184 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
186 eh->OnEventHandlerError(errcode);
190 int mask = eh->GetEventMask();
191 if (ev.events & EPOLLIN)
192 mask &= ~FD_READ_WILL_BLOCK;
193 if (ev.events & EPOLLOUT)
195 mask &= ~FD_WRITE_WILL_BLOCK;
196 if (mask & FD_WANT_SINGLE_WRITE)
198 int nm = mask & ~FD_WANT_SINGLE_WRITE;
199 OnSetEvent(eh, mask, nm);
203 eh->SetEventMask(mask);
204 if (ev.events & EPOLLIN)
206 eh->OnEventHandlerRead();
207 if (eh != GetRef(fd))
208 // whoa! we got deleted, better not give out the write event
211 if (ev.events & EPOLLOUT)
213 eh->OnEventHandlerWrite();