2 * InspIRCd -- Internet Relay Chat Daemon
4 * Copyright (C) 2014 Adam <Adam@anope.org>
5 * Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
6 * Copyright (C) 2009 Uli Schlachter <psychon@znc.in>
7 * Copyright (C) 2009 Craig Edwards <craigedwards@brainbox.cc>
8 * Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
10 * This file is part of InspIRCd. InspIRCd is free software: you can
11 * redistribute it and/or modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation, version 2.
14 * This program is distributed in the hope that it will be useful, but WITHOUT
15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
16 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
19 * You should have received a copy of the GNU General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
28 #include "exitcodes.h"
30 #include "socketengine.h"
34 # define __USE_XOPEN /* fuck every fucking OS ever made. needed by poll.h to work.*/
37 # include <sys/poll.h>
38 # include <sys/resource.h>
40 # define struct pollfd WSAPOLLFD
44 /** A specialisation of the SocketEngine class, designed to use poll().
46 class PollEngine : public SocketEngine
49 /** These are used by poll() to hold socket events
51 std::vector<struct pollfd> events;
52 /** This vector maps fds to an index in the events array.
54 std::vector<int> fd_mappings;
56 /** Create a new PollEngine
59 virtual bool AddFd(EventHandler* eh, int event_mask);
60 virtual void OnSetEvent(EventHandler* eh, int old_mask, int new_mask);
61 virtual void DelFd(EventHandler* eh);
62 virtual int DispatchEvents();
65 PollEngine::PollEngine() : events(1), fd_mappings(1)
68 if (!getrlimit(RLIMIT_NOFILE, &limits))
70 MAX_DESCRIPTORS = limits.rlim_cur;
74 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: Can't determine maximum number of open sockets: %s", strerror(errno));
75 std::cout << "ERROR: Can't determine maximum number of open sockets: " << strerror(errno) << std::endl;
76 ServerInstance->QuickExit(EXIT_STATUS_SOCKETENGINE);
80 static int mask_to_poll(int event_mask)
83 if (event_mask & (FD_WANT_POLL_READ | FD_WANT_FAST_READ))
85 if (event_mask & (FD_WANT_POLL_WRITE | FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE))
90 bool PollEngine::AddFd(EventHandler* eh, int event_mask)
93 if ((fd < 0) || (fd > GetMaxFds() - 1))
95 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "AddFd out of range: (fd: %d, max: %d)", fd, GetMaxFds());
99 if (static_cast<unsigned int>(fd) < fd_mappings.size() && fd_mappings[fd] != -1)
101 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Attempt to add duplicate fd: %d", fd);
105 unsigned int index = CurrentSetSize;
107 if (!SocketEngine::AddFdRef(eh))
109 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Attempt to add duplicate fd: %d", fd);
113 while (static_cast<unsigned int>(fd) >= fd_mappings.size())
114 fd_mappings.resize(fd_mappings.size() * 2, -1);
115 fd_mappings[fd] = index;
117 ResizeDouble(events);
118 events[index].fd = fd;
119 events[index].events = mask_to_poll(event_mask);
121 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "New file descriptor: %d (%d; index %d)", fd, events[index].events, index);
122 SocketEngine::SetEventMask(eh, event_mask);
126 void PollEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask)
128 int fd = eh->GetFd();
129 if (fd < 0 || static_cast<unsigned int>(fd) >= fd_mappings.size() || fd_mappings[fd] == -1)
131 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "SetEvents() on unknown fd: %d", eh->GetFd());
135 events[fd_mappings[fd]].events = mask_to_poll(new_mask);
138 void PollEngine::DelFd(EventHandler* eh)
140 int fd = eh->GetFd();
141 if ((fd < 0) || (fd > MAX_DESCRIPTORS))
143 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DelFd out of range: (fd: %d, max: %d)", fd, GetMaxFds());
147 if (static_cast<unsigned int>(fd) >= fd_mappings.size() || fd_mappings[fd] == -1)
149 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DelFd() on unknown fd: %d", fd);
153 unsigned int index = fd_mappings[fd];
154 unsigned int last_index = CurrentSetSize - 1;
155 int last_fd = events[last_index].fd;
157 if (index != last_index)
159 // We need to move the last fd we got into this gap (gaps are evil!)
161 // So update the mapping for the last fd to its new position
162 fd_mappings[last_fd] = index;
164 // move last_fd from last_index into index
165 events[index].fd = last_fd;
166 events[index].events = events[last_index].events;
169 // Now remove all data for the last fd we got into out list.
170 // Above code made sure this always is right
171 fd_mappings[fd] = -1;
172 events[last_index].fd = 0;
173 events[last_index].events = 0;
175 SocketEngine::DelFdRef(eh);
177 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Remove file descriptor: %d (index: %d) "
178 "(Filled gap with: %d (index: %d))", fd, index, last_fd, last_index);
181 int PollEngine::DispatchEvents()
183 int i = poll(&events[0], CurrentSetSize, 1000);
185 ServerInstance->UpdateTime();
187 for (int index = 0; index < CurrentSetSize && processed < i; index++)
189 struct pollfd& pfd = events[index];
191 // Copy these in case the vector gets resized and pfd invalidated
192 const int fd = pfd.fd;
193 const short revents = pfd.revents;
198 EventHandler* eh = GetRef(fd);
202 if (revents & POLLHUP)
204 eh->HandleEvent(EVENT_ERROR, 0);
208 if (revents & POLLERR)
211 socklen_t codesize = sizeof(int);
213 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
215 eh->HandleEvent(EVENT_ERROR, errcode);
219 if (revents & POLLIN)
221 SetEventMask(eh, eh->GetEventMask() & ~FD_READ_WILL_BLOCK);
222 eh->HandleEvent(EVENT_READ);
223 if (eh != GetRef(fd))
224 // whoops, deleted out from under us
228 if (revents & POLLOUT)
230 int mask = eh->GetEventMask();
231 mask &= ~(FD_WRITE_WILL_BLOCK | FD_WANT_SINGLE_WRITE);
232 SetEventMask(eh, mask);
234 // The vector could've been resized, reference can be invalid by now; don't use it
235 events[index].events = mask_to_poll(mask);
236 eh->HandleEvent(EVENT_WRITE);
243 SocketEngine* CreateSocketEngine()
245 return new PollEngine;