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/>.
24 #include "exitcodes.h"
28 #include <sys/resource.h>
30 /** A specialisation of the SocketEngine class, designed to use poll().
34 /** These are used by poll() to hold socket events
36 std::vector<struct pollfd> events(16);
37 /** This vector maps fds to an index in the events array.
39 std::vector<int> fd_mappings(16, -1);
42 void SocketEngine::Init()
45 if (!getrlimit(RLIMIT_NOFILE, &limits))
47 MAX_DESCRIPTORS = limits.rlim_cur;
51 // MAX_DESCRIPTORS is mainly used for display purposes, it's not a problem that getrlimit() failed
56 void SocketEngine::Deinit()
60 void SocketEngine::RecoverFromFork()
64 static int mask_to_poll(int event_mask)
67 if (event_mask & (FD_WANT_POLL_READ | FD_WANT_FAST_READ))
69 if (event_mask & (FD_WANT_POLL_WRITE | FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE))
74 bool SocketEngine::AddFd(EventHandler* eh, int event_mask)
79 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "AddFd out of range: (fd: %d)", fd);
83 if (static_cast<unsigned int>(fd) < fd_mappings.size() && fd_mappings[fd] != -1)
85 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Attempt to add duplicate fd: %d", fd);
89 unsigned int index = CurrentSetSize;
91 if (!SocketEngine::AddFdRef(eh))
93 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Attempt to add duplicate fd: %d", fd);
97 while (static_cast<unsigned int>(fd) >= fd_mappings.size())
98 fd_mappings.resize(fd_mappings.size() * 2, -1);
99 fd_mappings[fd] = index;
101 ResizeDouble(events);
102 events[index].fd = fd;
103 events[index].events = mask_to_poll(event_mask);
105 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "New file descriptor: %d (%d; index %d)", fd, events[index].events, index);
106 eh->SetEventMask(event_mask);
110 void SocketEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask)
112 int fd = eh->GetFd();
113 if (fd < 0 || static_cast<unsigned int>(fd) >= fd_mappings.size() || fd_mappings[fd] == -1)
115 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "SetEvents() on unknown fd: %d", eh->GetFd());
119 events[fd_mappings[fd]].events = mask_to_poll(new_mask);
122 void SocketEngine::DelFd(EventHandler* eh)
124 int fd = eh->GetFd();
127 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DelFd out of range: (fd: %d)", fd);
131 if (static_cast<unsigned int>(fd) >= fd_mappings.size() || fd_mappings[fd] == -1)
133 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DelFd() on unknown fd: %d", fd);
137 unsigned int index = fd_mappings[fd];
138 unsigned int last_index = CurrentSetSize - 1;
139 int last_fd = events[last_index].fd;
141 if (index != last_index)
143 // We need to move the last fd we got into this gap (gaps are evil!)
145 // So update the mapping for the last fd to its new position
146 fd_mappings[last_fd] = index;
148 // move last_fd from last_index into index
149 events[index].fd = last_fd;
150 events[index].events = events[last_index].events;
153 // Now remove all data for the last fd we got into out list.
154 // Above code made sure this always is right
155 fd_mappings[fd] = -1;
156 events[last_index].fd = 0;
157 events[last_index].events = 0;
159 SocketEngine::DelFdRef(eh);
161 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Remove file descriptor: %d (index: %d) "
162 "(Filled gap with: %d (index: %d))", fd, index, last_fd, last_index);
165 int SocketEngine::DispatchEvents()
167 int i = poll(&events[0], CurrentSetSize, 1000);
169 ServerInstance->UpdateTime();
171 for (size_t index = 0; index < CurrentSetSize && processed < i; index++)
173 struct pollfd& pfd = events[index];
175 // Copy these in case the vector gets resized and pfd invalidated
176 const int fd = pfd.fd;
177 const short revents = pfd.revents;
182 EventHandler* eh = GetRef(fd);
186 if (revents & POLLHUP)
188 eh->OnEventHandlerError(0);
192 if (revents & POLLERR)
195 socklen_t codesize = sizeof(int);
197 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
199 eh->OnEventHandlerError(errcode);
203 if (revents & POLLIN)
205 eh->SetEventMask(eh->GetEventMask() & ~FD_READ_WILL_BLOCK);
206 eh->OnEventHandlerRead();
207 if (eh != GetRef(fd))
208 // whoops, deleted out from under us
212 if (revents & POLLOUT)
214 int mask = eh->GetEventMask();
215 mask &= ~(FD_WRITE_WILL_BLOCK | FD_WANT_SINGLE_WRITE);
216 eh->SetEventMask(mask);
218 // The vector could've been resized, reference can be invalid by now; don't use it
219 events[index].events = mask_to_poll(mask);
220 eh->OnEventHandlerWrite();