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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 "socketengine.h"
#include <iostream>
/** A specialisation of the SocketEngine class, designed to use FreeBSD kqueue().
*/
class KQueueEngine : public SocketEngine
{
private:
int EngineHandle;
/** These are used by kqueue() to hold socket events
*/
struct kevent* ke_list;
/** This is a specialised time value used by kqueue()
*/
struct timespec ts;
public:
/** Create a new KQueueEngine
*/
KQueueEngine();
/** Delete a KQueueEngine
*/
virtual ~KQueueEngine();
bool AddFd(EventHandler* eh, int event_mask);
void OnSetEvent(EventHandler* eh, int old_mask, int new_mask);
virtual void DelFd(EventHandler* eh);
virtual int DispatchEvents();
virtual std::string GetName();
virtual void RecoverFromFork();
};
#include <sys/sysctl.h>
KQueueEngine::KQueueEngine()
{
MAX_DESCRIPTORS = 0;
int mib[2];
size_t len;
mib[0] = CTL_KERN;
mib[1] = KERN_MAXFILESPERPROC;
len = sizeof(MAX_DESCRIPTORS);
sysctl(mib, 2, &MAX_DESCRIPTORS, &len, NULL, 0);
if (MAX_DESCRIPTORS <= 0)
{
ServerInstance->Logs->Log("SOCKET", DEFAULT, "ERROR: Can't determine maximum number of open sockets!");
std::cout << "ERROR: Can't determine maximum number of open sockets!" << std::endl;
ServerInstance->Exit(EXIT_STATUS_SOCKETENGINE);
}
this->RecoverFromFork();
ke_list = new struct kevent[GetMaxFds()];
ref = new EventHandler* [GetMaxFds()];
memset(ref, 0, GetMaxFds() * sizeof(EventHandler*));
}
void KQueueEngine::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",DEFAULT, "ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features.");
ServerInstance->Logs->Log("SOCKET",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->Exit(EXIT_STATUS_SOCKETENGINE);
}
CurrentSetSize = 0;
}
KQueueEngine::~KQueueEngine()
{
this->Close(EngineHandle);
delete[] ref;
delete[] ke_list;
}
bool KQueueEngine::AddFd(EventHandler* eh, int event_mask)
{
int fd = eh->GetFd();
if ((fd < 0) || (fd > GetMaxFds() - 1))
return false;
if (ref[fd])
return false;
// We always want to read from the socket...
struct kevent ke;
EV_SET(&ke, fd, EVFILT_READ, EV_ADD, 0, 0, NULL);
int i = kevent(EngineHandle, &ke, 1, 0, 0, NULL);
if (i == -1)
{
ServerInstance->Logs->Log("SOCKET",DEFAULT,"Failed to add fd: %d %s",
fd, strerror(errno));
return false;
}
ref[fd] = eh;
SocketEngine::SetEventMask(eh, event_mask);
OnSetEvent(eh, 0, event_mask);
CurrentSetSize++;
ServerInstance->Logs->Log("SOCKET",DEBUG,"New file descriptor: %d", fd);
return true;
}
void KQueueEngine::DelFd(EventHandler* eh)
{
int fd = eh->GetFd();
if ((fd < 0) || (fd > GetMaxFds() - 1))
{
ServerInstance->Logs->Log("SOCKET",DEFAULT,"DelFd() on invalid fd: %d", fd);
return;
}
struct kevent ke;
// First remove the write filter ignoring errors, since we can't be
// sure if there are actually any write filters registered.
EV_SET(&ke, eh->GetFd(), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
kevent(EngineHandle, &ke, 1, 0, 0, NULL);
// Then remove the read filter.
EV_SET(&ke, eh->GetFd(), EVFILT_READ, EV_DELETE, 0, 0, NULL);
int j = kevent(EngineHandle, &ke, 1, 0, 0, NULL);
if (j < 0)
{
ServerInstance->Logs->Log("SOCKET",DEFAULT,"Failed to remove fd: %d %s",
fd, strerror(errno));
}
CurrentSetSize--;
ref[fd] = NULL;
ServerInstance->Logs->Log("SOCKET",DEBUG,"Remove file descriptor: %d", fd);
}
void KQueueEngine::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;
EV_SET(&ke, eh->GetFd(), EVFILT_WRITE, EV_ADD, 0, 0, NULL);
int i = kevent(EngineHandle, &ke, 1, 0, 0, NULL);
if (i < 0) {
ServerInstance->Logs->Log("SOCKET",DEFAULT,"Failed to mark for writing: %d %s",
eh->GetFd(), strerror(errno));
}
}
else if ((old_mask & FD_WANT_POLL_WRITE) && !(new_mask & FD_WANT_POLL_WRITE))
{
// removing poll-style write
struct kevent ke;
EV_SET(&ke, eh->GetFd(), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
int i = kevent(EngineHandle, &ke, 1, 0, 0, NULL);
if (i < 0) {
ServerInstance->Logs->Log("SOCKET",DEFAULT,"Failed to mark for writing: %d %s",
eh->GetFd(), strerror(errno));
}
}
if ((new_mask & (FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE)) && !(old_mask & (FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE)))
{
// new one-shot write
struct kevent ke;
EV_SET(&ke, eh->GetFd(), EVFILT_WRITE, EV_ADD | EV_ONESHOT, 0, 0, NULL);
int i = kevent(EngineHandle, &ke, 1, 0, 0, NULL);
if (i < 0) {
ServerInstance->Logs->Log("SOCKET",DEFAULT,"Failed to mark for writing: %d %s",
eh->GetFd(), strerror(errno));
}
}
}
int KQueueEngine::DispatchEvents()
{
ts.tv_nsec = 0;
ts.tv_sec = 1;
int i = kevent(EngineHandle, NULL, 0, &ke_list[0], GetMaxFds(), &ts);
ServerInstance->UpdateTime();
TotalEvents += i;
for (int j = 0; j < i; j++)
{
EventHandler* eh = ref[ke_list[j].ident];
if (!eh)
continue;
if (ke_list[j].flags & EV_EOF)
{
ErrorEvents++;
eh->HandleEvent(EVENT_ERROR, ke_list[j].fflags);
continue;
}
if (ke_list[j].filter == EVFILT_WRITE)
{
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;
SetEventMask(eh, eh->GetEventMask() & ~bits_to_clr);
eh->HandleEvent(EVENT_WRITE);
if (eh != ref[ke_list[j].ident])
// whoops, deleted out from under us
continue;
}
if (ke_list[j].filter == EVFILT_READ)
{
ReadEvents++;
SetEventMask(eh, eh->GetEventMask() & ~FD_READ_WILL_BLOCK);
eh->HandleEvent(EVENT_READ);
}
}
return i;
}
std::string KQueueEngine::GetName()
{
return "kqueue";
}
SocketEngine* CreateSocketEngine()
{
return new KQueueEngine;
}
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