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/>.
27 #include "exitcodes.h"
29 #include "socketengine.h"
32 #include <sys/resource.h>
34 /** A specialisation of the SocketEngine class, designed to use poll().
38 /** These are used by poll() to hold socket events
40 std::vector<struct pollfd> events(16);
41 /** This vector maps fds to an index in the events array.
43 std::vector<int> fd_mappings(16);
46 void SocketEngine::Init()
49 if (!getrlimit(RLIMIT_NOFILE, &limits))
51 MAX_DESCRIPTORS = limits.rlim_cur;
55 // MAX_DESCRIPTORS is mainly used for display purposes, it's not a problem that getrlimit() failed
60 void SocketEngine::Deinit()
64 void SocketEngine::RecoverFromFork()
68 static int mask_to_poll(int event_mask)
71 if (event_mask & (FD_WANT_POLL_READ | FD_WANT_FAST_READ))
73 if (event_mask & (FD_WANT_POLL_WRITE | FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE))
78 bool SocketEngine::AddFd(EventHandler* eh, int event_mask)
83 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "AddFd out of range: (fd: %d)", fd);
87 if (static_cast<unsigned int>(fd) < fd_mappings.size() && fd_mappings[fd] != -1)
89 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Attempt to add duplicate fd: %d", fd);
93 unsigned int index = CurrentSetSize;
95 if (!SocketEngine::AddFdRef(eh))
97 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Attempt to add duplicate fd: %d", fd);
101 while (static_cast<unsigned int>(fd) >= fd_mappings.size())
102 fd_mappings.resize(fd_mappings.size() * 2, -1);
103 fd_mappings[fd] = index;
105 ResizeDouble(events);
106 events[index].fd = fd;
107 events[index].events = mask_to_poll(event_mask);
109 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "New file descriptor: %d (%d; index %d)", fd, events[index].events, index);
110 eh->SetEventMask(event_mask);
114 void SocketEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask)
116 int fd = eh->GetFd();
117 if (fd < 0 || static_cast<unsigned int>(fd) >= fd_mappings.size() || fd_mappings[fd] == -1)
119 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "SetEvents() on unknown fd: %d", eh->GetFd());
123 events[fd_mappings[fd]].events = mask_to_poll(new_mask);
126 void SocketEngine::DelFd(EventHandler* eh)
128 int fd = eh->GetFd();
131 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DelFd out of range: (fd: %d)", fd);
135 if (static_cast<unsigned int>(fd) >= fd_mappings.size() || fd_mappings[fd] == -1)
137 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DelFd() on unknown fd: %d", fd);
141 unsigned int index = fd_mappings[fd];
142 unsigned int last_index = CurrentSetSize - 1;
143 int last_fd = events[last_index].fd;
145 if (index != last_index)
147 // We need to move the last fd we got into this gap (gaps are evil!)
149 // So update the mapping for the last fd to its new position
150 fd_mappings[last_fd] = index;
152 // move last_fd from last_index into index
153 events[index].fd = last_fd;
154 events[index].events = events[last_index].events;
157 // Now remove all data for the last fd we got into out list.
158 // Above code made sure this always is right
159 fd_mappings[fd] = -1;
160 events[last_index].fd = 0;
161 events[last_index].events = 0;
163 SocketEngine::DelFdRef(eh);
165 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Remove file descriptor: %d (index: %d) "
166 "(Filled gap with: %d (index: %d))", fd, index, last_fd, last_index);
169 int SocketEngine::DispatchEvents()
171 int i = poll(&events[0], CurrentSetSize, 1000);
173 ServerInstance->UpdateTime();
175 for (int index = 0; index < CurrentSetSize && processed < i; index++)
177 struct pollfd& pfd = events[index];
179 // Copy these in case the vector gets resized and pfd invalidated
180 const int fd = pfd.fd;
181 const short revents = pfd.revents;
186 EventHandler* eh = GetRef(fd);
190 if (revents & POLLHUP)
192 eh->HandleEvent(EVENT_ERROR, 0);
196 if (revents & POLLERR)
199 socklen_t codesize = sizeof(int);
201 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
203 eh->HandleEvent(EVENT_ERROR, errcode);
207 if (revents & POLLIN)
209 eh->SetEventMask(eh->GetEventMask() & ~FD_READ_WILL_BLOCK);
210 eh->HandleEvent(EVENT_READ);
211 if (eh != GetRef(fd))
212 // whoops, deleted out from under us
216 if (revents & POLLOUT)
218 int mask = eh->GetEventMask();
219 mask &= ~(FD_WRITE_WILL_BLOCK | FD_WANT_SINGLE_WRITE);
220 eh->SetEventMask(mask);
222 // The vector could've been resized, reference can be invalid by now; don't use it
223 events[index].events = mask_to_poll(mask);
224 eh->HandleEvent(EVENT_WRITE);