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();
63 virtual std::string GetName();
66 PollEngine::PollEngine() : events(1), fd_mappings(1)
70 if (!getrlimit(RLIMIT_NOFILE, &limits))
72 MAX_DESCRIPTORS = limits.rlim_cur;
76 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: Can't determine maximum number of open sockets: %s", strerror(errno));
77 std::cout << "ERROR: Can't determine maximum number of open sockets: " << strerror(errno) << std::endl;
78 ServerInstance->QuickExit(EXIT_STATUS_SOCKETENGINE);
82 static int mask_to_poll(int event_mask)
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 bool PollEngine::AddFd(EventHandler* eh, int event_mask)
95 if ((fd < 0) || (fd > GetMaxFds() - 1))
97 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "AddFd out of range: (fd: %d, max: %d)", fd, GetMaxFds());
101 if (static_cast<unsigned int>(fd) < fd_mappings.size() && fd_mappings[fd] != -1)
103 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Attempt to add duplicate fd: %d", fd);
107 if (!SocketEngine::AddFd(eh))
109 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Attempt to add duplicate fd: %d", fd);
113 unsigned int index = CurrentSetSize;
115 while (static_cast<unsigned int>(fd) >= fd_mappings.size())
116 fd_mappings.resize(fd_mappings.size() * 2, -1);
117 fd_mappings[fd] = index;
119 ResizeDouble(events);
120 events[index].fd = fd;
121 events[index].events = mask_to_poll(event_mask);
123 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "New file descriptor: %d (%d; index %d)", fd, events[index].events, index);
124 SocketEngine::SetEventMask(eh, event_mask);
129 void PollEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask)
131 int fd = eh->GetFd();
132 if (fd < 0 || static_cast<unsigned int>(fd) >= fd_mappings.size() || fd_mappings[fd] == -1)
134 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "SetEvents() on unknown fd: %d", eh->GetFd());
138 events[fd_mappings[fd]].events = mask_to_poll(new_mask);
141 void PollEngine::DelFd(EventHandler* eh)
143 int fd = eh->GetFd();
144 if ((fd < 0) || (fd > MAX_DESCRIPTORS))
146 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DelFd out of range: (fd: %d, max: %d)", fd, GetMaxFds());
150 if (static_cast<unsigned int>(fd) >= fd_mappings.size() || fd_mappings[fd] == -1)
152 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DelFd() on unknown fd: %d", fd);
156 unsigned int index = fd_mappings[fd];
157 unsigned int last_index = CurrentSetSize - 1;
158 int last_fd = events[last_index].fd;
160 if (index != last_index)
162 // We need to move the last fd we got into this gap (gaps are evil!)
164 // So update the mapping for the last fd to its new position
165 fd_mappings[last_fd] = index;
167 // move last_fd from last_index into index
168 events[index].fd = last_fd;
169 events[index].events = events[last_index].events;
172 // Now remove all data for the last fd we got into out list.
173 // Above code made sure this always is right
174 fd_mappings[fd] = -1;
175 events[last_index].fd = 0;
176 events[last_index].events = 0;
178 SocketEngine::DelFd(eh);
182 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Remove file descriptor: %d (index: %d) "
183 "(Filled gap with: %d (index: %d))", fd, index, last_fd, last_index);
186 int PollEngine::DispatchEvents()
188 int i = poll(&events[0], CurrentSetSize, 1000);
190 socklen_t codesize = sizeof(int);
193 ServerInstance->UpdateTime();
195 for (index = 0; index < CurrentSetSize && processed < i; index++)
197 struct pollfd& pfd = events[index];
199 // Copy these in case the vector gets resized and pfd invalidated
200 const int fd = pfd.fd;
201 const short revents = pfd.revents;
206 EventHandler* eh = GetRef(fd);
210 if (revents & POLLHUP)
212 eh->HandleEvent(EVENT_ERROR, 0);
216 if (revents & POLLERR)
219 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
221 eh->HandleEvent(EVENT_ERROR, errcode);
225 if (revents & POLLIN)
227 SetEventMask(eh, eh->GetEventMask() & ~FD_READ_WILL_BLOCK);
228 eh->HandleEvent(EVENT_READ);
229 if (eh != GetRef(fd))
230 // whoops, deleted out from under us
234 if (revents & POLLOUT)
236 int mask = eh->GetEventMask();
237 mask &= ~(FD_WRITE_WILL_BLOCK | FD_WANT_SINGLE_WRITE);
238 SetEventMask(eh, mask);
240 // The vector could've been resized, reference can be invalid by now; don't use it
241 events[index].events = mask_to_poll(mask);
242 eh->HandleEvent(EVENT_WRITE);
249 std::string PollEngine::GetName()
254 SocketEngine* CreateSocketEngine()
256 return new PollEngine;