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/>.
24 #include <sys/types.h>
25 #include <sys/event.h>
27 #include <sys/sysctl.h>
29 /** A specialisation of the SocketEngine class, designed to use BSD kqueue().
34 unsigned int ChangePos = 0;
35 /** These are used by kqueue() to hold socket events
37 std::vector<struct kevent> ke_list(16);
41 std::vector<struct kevent> changelist(8);
44 /** Initialize the kqueue engine
46 void SocketEngine::Init()
52 void SocketEngine::RecoverFromFork()
55 * The only bad thing about kqueue is that its fd cant survive a fork and is not inherited.
59 EngineHandle = kqueue();
60 if (EngineHandle == -1)
64 /** Shutdown the kqueue engine
66 void SocketEngine::Deinit()
71 static struct kevent* GetChangeKE()
73 if (ChangePos >= changelist.size())
74 changelist.resize(changelist.size() * 2);
75 return &changelist[ChangePos++];
78 bool SocketEngine::AddFd(EventHandler* eh, int event_mask)
85 if (!SocketEngine::AddFdRef(eh))
88 // We always want to read from the socket...
89 struct kevent* ke = GetChangeKE();
90 EV_SET(ke, fd, EVFILT_READ, EV_ADD, 0, 0, static_cast<void*>(eh));
92 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "New file descriptor: %d", fd);
94 eh->SetEventMask(event_mask);
95 OnSetEvent(eh, 0, event_mask);
96 ResizeDouble(ke_list);
101 void SocketEngine::DelFd(EventHandler* eh)
103 int fd = eh->GetFd();
107 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "DelFd() on invalid fd: %d", fd);
111 // First remove the write filter ignoring errors, since we can't be
112 // sure if there are actually any write filters registered.
113 struct kevent* ke = GetChangeKE();
114 EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
116 // Then remove the read filter.
118 EV_SET(ke, eh->GetFd(), EVFILT_READ, EV_DELETE, 0, 0, NULL);
120 SocketEngine::DelFdRef(eh);
122 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Remove file descriptor: %d", fd);
125 void SocketEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask)
127 if ((new_mask & FD_WANT_POLL_WRITE) && !(old_mask & FD_WANT_POLL_WRITE))
129 // new poll-style write
130 struct kevent* ke = GetChangeKE();
131 EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_ADD, 0, 0, static_cast<void*>(eh));
133 else if ((old_mask & FD_WANT_POLL_WRITE) && !(new_mask & FD_WANT_POLL_WRITE))
135 // removing poll-style write
136 struct kevent* ke = GetChangeKE();
137 EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
139 if ((new_mask & (FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE)) && !(old_mask & (FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE)))
141 struct kevent* ke = GetChangeKE();
142 EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_ADD | EV_ONESHOT, 0, 0, static_cast<void*>(eh));
146 int SocketEngine::DispatchEvents()
152 int i = kevent(EngineHandle, &changelist.front(), ChangePos, &ke_list.front(), ke_list.size(), &ts);
154 ServerInstance->UpdateTime();
159 stats.TotalEvents += i;
161 for (int j = 0; j < i; j++)
163 struct kevent& kev = ke_list[j];
164 EventHandler* eh = static_cast<EventHandler*>(kev.udata);
168 // Copy these in case the vector gets resized and kev invalidated
169 const int fd = eh->GetFd();
170 const short filter = kev.filter;
174 if (kev.flags & EV_EOF)
177 eh->OnEventHandlerError(kev.fflags);
180 if (filter == EVFILT_WRITE)
182 /* When mask is FD_WANT_FAST_WRITE or FD_WANT_SINGLE_WRITE,
183 * we set a one-shot write, so we need to clear that bit
184 * to detect when it set again.
186 const int bits_to_clr = FD_WANT_SINGLE_WRITE | FD_WANT_FAST_WRITE | FD_WRITE_WILL_BLOCK;
187 eh->SetEventMask(eh->GetEventMask() & ~bits_to_clr);
188 eh->OnEventHandlerWrite();
190 else if (filter == EVFILT_READ)
192 eh->SetEventMask(eh->GetEventMask() & ~FD_READ_WILL_BLOCK);
193 eh->OnEventHandlerRead();