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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2009 Uli Schlachter <psychon@znc.in>
* Copyright (C) 2007-2008 Craig Edwards <craigedwards@brainbox.cc>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
#include "exitcodes.h"
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#include <iostream>
#include <sys/sysctl.h>
/** A specialisation of the SocketEngine class, designed to use BSD kqueue().
*/
namespace
{
int EngineHandle;
unsigned int ChangePos = 0;
/** These are used by kqueue() to hold socket events
*/
std::vector<struct kevent> ke_list(16);
/** Pending changes
*/
std::vector<struct kevent> changelist(8);
}
/** Initialize the kqueue engine
*/
void SocketEngine::Init()
{
MAX_DESCRIPTORS = 0;
int mib[2];
size_t len;
mib[0] = CTL_KERN;
#ifdef KERN_MAXFILESPERPROC
mib[1] = KERN_MAXFILESPERPROC;
#else
mib[1] = KERN_MAXFILES;
#endif
len = sizeof(MAX_DESCRIPTORS);
// MAX_DESCRIPTORS is mainly used for display purposes, no problem if the sysctl() below fails
sysctl(mib, 2, &MAX_DESCRIPTORS, &len, NULL, 0);
RecoverFromFork();
}
void SocketEngine::RecoverFromFork()
{
/*
* The only bad thing about kqueue is that its fd cant survive a fork and is not inherited.
* BUM HATS.
*
*/
EngineHandle = kqueue();
if (EngineHandle == -1)
{
ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features.");
ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "ERROR: this is a fatal error, exiting now.");
std::cout << "ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features." << std::endl;
std::cout << "ERROR: this is a fatal error, exiting now." << std::endl;
ServerInstance->QuickExit(EXIT_STATUS_SOCKETENGINE);
}
}
/** Shutdown the kqueue engine
*/
void SocketEngine::Deinit()
{
Close(EngineHandle);
}
static struct kevent* GetChangeKE()
{
if (ChangePos >= changelist.size())
changelist.resize(changelist.size() * 2);
return &changelist[ChangePos++];
}
bool SocketEngine::AddFd(EventHandler* eh, int event_mask)
{
int fd = eh->GetFd();
if (fd < 0)
return false;
if (!SocketEngine::AddFdRef(eh))
return false;
// We always want to read from the socket...
struct kevent* ke = GetChangeKE();
EV_SET(ke, fd, EVFILT_READ, EV_ADD, 0, 0, static_cast<void*>(eh));
ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "New file descriptor: %d", fd);
eh->SetEventMask(event_mask);
OnSetEvent(eh, 0, event_mask);
ResizeDouble(ke_list);
return true;
}
void SocketEngine::DelFd(EventHandler* eh)
{
int fd = eh->GetFd();
if (fd < 0)
{
ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "DelFd() on invalid fd: %d", fd);
return;
}
// First remove the write filter ignoring errors, since we can't be
// sure if there are actually any write filters registered.
struct kevent* ke = GetChangeKE();
EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
// Then remove the read filter.
ke = GetChangeKE();
EV_SET(ke, eh->GetFd(), EVFILT_READ, EV_DELETE, 0, 0, NULL);
SocketEngine::DelFdRef(eh);
ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Remove file descriptor: %d", fd);
}
void SocketEngine::OnSetEvent(EventHandler* eh, int old_mask, int new_mask)
{
if ((new_mask & FD_WANT_POLL_WRITE) && !(old_mask & FD_WANT_POLL_WRITE))
{
// new poll-style write
struct kevent* ke = GetChangeKE();
EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_ADD, 0, 0, static_cast<void*>(eh));
}
else if ((old_mask & FD_WANT_POLL_WRITE) && !(new_mask & FD_WANT_POLL_WRITE))
{
// removing poll-style write
struct kevent* ke = GetChangeKE();
EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
}
if ((new_mask & (FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE)) && !(old_mask & (FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE)))
{
struct kevent* ke = GetChangeKE();
EV_SET(ke, eh->GetFd(), EVFILT_WRITE, EV_ADD | EV_ONESHOT, 0, 0, static_cast<void*>(eh));
}
}
int SocketEngine::DispatchEvents()
{
struct timespec ts;
ts.tv_nsec = 0;
ts.tv_sec = 1;
int i = kevent(EngineHandle, &changelist.front(), ChangePos, &ke_list.front(), ke_list.size(), &ts);
ChangePos = 0;
ServerInstance->UpdateTime();
if (i < 0)
return i;
stats.TotalEvents += i;
for (int j = 0; j < i; j++)
{
struct kevent& kev = ke_list[j];
EventHandler* eh = static_cast<EventHandler*>(kev.udata);
if (!eh)
continue;
// Copy these in case the vector gets resized and kev invalidated
const int fd = eh->GetFd();
const short filter = kev.filter;
if (fd < 0)
continue;
if (kev.flags & EV_EOF)
{
stats.ErrorEvents++;
eh->HandleEvent(EVENT_ERROR, kev.fflags);
continue;
}
if (filter == EVFILT_WRITE)
{
stats.WriteEvents++;
/* When mask is FD_WANT_FAST_WRITE or FD_WANT_SINGLE_WRITE,
* we set a one-shot write, so we need to clear that bit
* to detect when it set again.
*/
const int bits_to_clr = FD_WANT_SINGLE_WRITE | FD_WANT_FAST_WRITE | FD_WRITE_WILL_BLOCK;
eh->SetEventMask(eh->GetEventMask() & ~bits_to_clr);
eh->HandleEvent(EVENT_WRITE);
}
else if (filter == EVFILT_READ)
{
stats.ReadEvents++;
eh->SetEventMask(eh->GetEventMask() & ~FD_READ_WILL_BLOCK);
eh->HandleEvent(EVENT_READ);
}
}
return i;
}
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