2 * InspIRCd -- Internet Relay Chat Daemon
4 * Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
5 * Copyright (C) 2009 Uli Schlachter <psychon@znc.in>
6 * Copyright (C) 2007-2008 Craig Edwards <craigedwards@brainbox.cc>
8 * This file is part of InspIRCd. InspIRCd is free software: you can
9 * redistribute it and/or modify it under the terms of the GNU General Public
10 * License as published by the Free Software Foundation, version 2.
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "exitcodes.h"
24 #include <sys/types.h>
25 #include <sys/event.h>
27 #include "socketengine.h"
29 #include <sys/sysctl.h>
31 /** A specialisation of the SocketEngine class, designed to use BSD kqueue().
36 unsigned int ChangePos = 0;
37 /** These are used by kqueue() to hold socket events
39 std::vector<struct kevent> ke_list(16);
43 std::vector<struct kevent> changelist(8);
46 /** Initialize the kqueue engine
48 void SocketEngine::Init()
55 #ifdef KERN_MAXFILESPERPROC
56 mib[1] = KERN_MAXFILESPERPROC;
58 mib[1] = KERN_MAXFILES;
60 len = sizeof(MAX_DESCRIPTORS);
61 sysctl(mib, 2, &MAX_DESCRIPTORS, &len, NULL, 0);
62 if (MAX_DESCRIPTORS <= 0)
64 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: Can't determine maximum number of open sockets!");
65 std::cout << "ERROR: Can't determine maximum number of open sockets!" << std::endl;
66 ServerInstance->QuickExit(EXIT_STATUS_SOCKETENGINE);
72 void SocketEngine::RecoverFromFork()
75 * The only bad thing about kqueue is that its fd cant survive a fork and is not inherited.
79 EngineHandle = kqueue();
80 if (EngineHandle == -1)
82 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features.");
83 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: this is a fatal error, exiting now.");
84 std::cout << "ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features." << std::endl;
85 std::cout << "ERROR: this is a fatal error, exiting now." << std::endl;
86 ServerInstance->QuickExit(EXIT_STATUS_SOCKETENGINE);
90 /** Shutdown the kqueue engine
92 void SocketEngine::Deinit()
97 static struct kevent* GetChangeKE()
99 if (ChangePos >= changelist.size())
100 changelist.resize(changelist.size() * 2);
101 return &changelist[ChangePos++];
104 bool SocketEngine::AddFd(EventHandler* eh, int event_mask)
106 int fd = eh->GetFd();
108 if ((fd < 0) || (fd > GetMaxFds() - 1))
111 if (!SocketEngine::AddFdRef(eh))
114 // We always want to read from the socket...
115 struct kevent* ke = GetChangeKE();
116 EV_SET(ke, fd, EVFILT_READ, EV_ADD, 0, 0, static_cast<void*>(eh));
118 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "New file descriptor: %d", fd);
120 eh->SetEventMask(event_mask);
121 OnSetEvent(eh, 0, event_mask);
122 ResizeDouble(ke_list);
127 void SocketEngine::DelFd(EventHandler* eh)
129 int fd = eh->GetFd();
131 if ((fd < 0) || (fd > GetMaxFds() - 1))
133 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "DelFd() on invalid fd: %d", fd);
137 // First remove the write filter ignoring errors, since we can't be
138 // sure if there are actually any write filters registered.
139 struct kevent* ke = GetChangeKE();
140 EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
142 // Then remove the read filter.
144 EV_SET(ke, eh->GetFd(), EVFILT_READ, EV_DELETE, 0, 0, NULL);
146 SocketEngine::DelFdRef(eh);
148 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Remove file descriptor: %d", fd);
151 void SocketEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask)
153 if ((new_mask & FD_WANT_POLL_WRITE) && !(old_mask & FD_WANT_POLL_WRITE))
155 // new poll-style write
156 struct kevent* ke = GetChangeKE();
157 EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_ADD, 0, 0, static_cast<void*>(eh));
159 else if ((old_mask & FD_WANT_POLL_WRITE) && !(new_mask & FD_WANT_POLL_WRITE))
161 // removing poll-style write
162 struct kevent* ke = GetChangeKE();
163 EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
165 if ((new_mask & (FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE)) && !(old_mask & (FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE)))
167 struct kevent* ke = GetChangeKE();
168 EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_ADD | EV_ONESHOT, 0, 0, static_cast<void*>(eh));
172 int SocketEngine::DispatchEvents()
178 int i = kevent(EngineHandle, &changelist.front(), ChangePos, &ke_list.front(), ke_list.size(), &ts);
180 ServerInstance->UpdateTime();
185 stats.TotalEvents += i;
187 for (int j = 0; j < i; j++)
189 struct kevent& kev = ke_list[j];
190 EventHandler* eh = static_cast<EventHandler*>(kev.udata);
194 // Copy these in case the vector gets resized and kev invalidated
195 const int fd = eh->GetFd();
196 const short filter = kev.filter;
200 if (kev.flags & EV_EOF)
203 eh->HandleEvent(EVENT_ERROR, kev.fflags);
206 if (filter == EVFILT_WRITE)
209 /* When mask is FD_WANT_FAST_WRITE or FD_WANT_SINGLE_WRITE,
210 * we set a one-shot write, so we need to clear that bit
211 * to detect when it set again.
213 const int bits_to_clr = FD_WANT_SINGLE_WRITE | FD_WANT_FAST_WRITE | FD_WRITE_WILL_BLOCK;
214 eh->SetEventMask(eh->GetEventMask() & ~bits_to_clr);
215 eh->HandleEvent(EVENT_WRITE);
217 else if (filter == EVFILT_READ)
220 eh->SetEventMask(eh->GetEventMask() & ~FD_READ_WILL_BLOCK);
221 eh->HandleEvent(EVENT_READ);