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|
/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
* E-mail:
* <brain@chatspike.net>
* <Craig@chatspike.net>
*
* Written by Craig Edwards, Craig McLure, and others.
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
#include "inspircd.h"
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#include "socketengine_kqueue.h"
KQueueEngine::KQueueEngine(InspIRCd* Instance) : SocketEngine(Instance)
{
EngineHandle = kqueue();
if (EngineHandle == -1)
{
ServerInstance->Log(SPARSE,"ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features.");
ServerInstance->Log(SPARSE,"ERROR: this is a fatal error, exiting now.");
printf("ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features.");
printf("ERROR: this is a fatal error, exiting now.");
InspIRCd::Exit(ERROR);
}
CurrentSetSize = 0;
}
KQueueEngine::~KQueueEngine()
{
ServerInstance->Log(DEBUG,"KQueueEngine::~KQueueEngine()");
close(EngineHandle);
}
bool KQueueEngine::AddFd(EventHandler* eh)
{
int fd = eh->GetFd();
ServerInstance->Log(DEBUG,"KQueueEngine::AddFd(%d)",fd);
if ((fd < 0) || (fd > MAX_DESCRIPTORS))
{
ServerInstance->Log(DEFAULT,"ERROR: FD of %d added above max of %d",fd,MAX_DESCRIPTORS);
return false;
}
if (GetRemainingFds() <= 1)
{
ServerInstance->Log(DEFAULT,"ERROR: System out of file descriptors!");
return false;
}
if (ref[fd])
{
ServerInstance->Log(DEFAULT,"ERROR: Slot already occupied");
return false;
}
ref[fd] = eh;
ServerInstance->Log(DEBUG,"Add socket %d",fd);
struct kevent ke;
ServerInstance->Log(DEBUG,"kqueue: Add socket to events, kq=%d socket=%d",EngineHandle,fd);
EV_SET(&ke, fd, eh->Readable() ? EVFILT_READ : EVFILT_WRITE, EV_ADD, 0, 0, NULL);
int i = kevent(EngineHandle, &ke, 1, 0, 0, NULL);
if (i == -1)
{
ServerInstance->Log(DEBUG,"kqueue: List insertion failure!");
return false;
}
CurrentSetSize++;
return true;
}
bool KQueueEngine::DelFd(EventHandler* eh)
{
int fd = eh->GetFd();
ServerInstance->Log(DEBUG,"KQueueEngine::DelFd(%d)",fd);
if ((fd < 0) || (fd > MAX_DESCRIPTORS))
return false;
struct kevent ke;
EV_SET(&ke, eh->GetFd(), EVFILT_READ, EV_DELETE, 0, 0, NULL);
int i = kevent(EngineHandle, &ke, 1, 0, 0, NULL);
EV_SET(&ke, eh->GetFd(), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
int j = kevent(EngineHandle, &ke, 1, 0, 0, NULL);
if ((j < 0) && (i < 0))
return false;
CurrentSetSize--;
ref[fd] = NULL;
return true;
}
void KQueueEngine::WantWrite(EventHandler* eh)
{
/** When changing an item in a kqueue, there is no 'modify' call
* as in epoll. Instead, we add the item again, and this overwrites
* the original setting rather than adding it twice. See man kqueue.
*/
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 == -1)
{
ServerInstance->Log(DEBUG,"kqueue: Unable to set fd %d for wanting write", eh->GetFd());
}
}
int KQueueEngine::GetMaxFds()
{
return MAX_DESCRIPTORS;
}
int KQueueEngine::GetRemainingFds()
{
return MAX_DESCRIPTORS - CurrentSetSize;
}
int KQueueEngine::DispatchEvents()
{
ts.tv_nsec = 5000L;
ts.tv_sec = 0;
int i = kevent(EngineHandle, NULL, 0, &ke_list[0], MAX_DESCRIPTORS, &ts);
for (int j = 0; j < i; j++)
{
ServerInstance->Log(DEBUG,"Handle %s event on fd %d",ke_list[j].flags & EVFILT_WRITE ? "write" : "read", ke_list[j].ident);
if (ke_list[j].flags & EV_EOF)
{
ServerInstance->Log(DEBUG,"kqueue: Error on FD %d", ke_list[j].ident);
/* We love you kqueue, oh yes we do *sings*!
* kqueue gives us the error number directly in the EOF state!
* Unlike smelly epoll and select, where we have to getsockopt
* to get the error, this saves us time and cpu cycles. Go BSD!
*/
ref[ke_list[j].ident]->HandleEvent(EVENT_ERROR, ke_list[j].fflags);
continue;
}
if (ke_list[j].flags & EVFILT_WRITE)
{
/* This looks wrong but its right. As above, theres no modify
* call in kqueue. See the manpage.
*/
struct kevent ke;
EV_SET(&ke, ke_list[j].ident, EVFILT_READ, EV_ADD, 0, 0, NULL);
int i = kevent(EngineHandle, &ke, 1, 0, 0, NULL);
if (i == -1)
{
ServerInstance->Log(DEBUG,"kqueue: Unable to set fd %d back to just wanting to read!", ke_list[j].ident);
}
if (ref[ke_list[j].ident])
ref[ke_list[j].ident]->HandleEvent(EVENT_WRITE);
}
else
{
if (ref[ke_list[j].ident])
ref[ke_list[j].ident]->HandleEvent(EVENT_READ);
}
}
return i;
}
std::string KQueueEngine::GetName()
{
return "kqueue";
}
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