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/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2008 InspIRCd Development Team
* See: http://www.inspircd.org/wiki/index.php/Credits
*
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
#include "inspircd.h"
#include "exitcodes.h"
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#include "socketengines/socketengine_kqueue.h"
#include <sys/sysctl.h>
KQueueEngine::KQueueEngine(InspIRCd* Instance) : SocketEngine(Instance)
{
this->RecoverFromFork();
ref = new EventHandler* [GetMaxFds()];
ke_list = new struct kevent[GetMaxFds()];
}
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.");
printf("ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features.\n");
printf("ERROR: this is a fatal error, exiting now.\n");
ServerInstance->Exit(EXIT_STATUS_SOCKETENGINE);
}
CurrentSetSize = 0;
memset(ref, 0, GetMaxFds() * sizeof(EventHandler*));
}
KQueueEngine::~KQueueEngine()
{
this->Close(EngineHandle);
delete[] ref;
delete[] ke_list;
}
bool KQueueEngine::AddFd(EventHandler* eh)
{
int fd = eh->GetFd();
if ((fd < 0) || (fd > GetMaxFds() - 1))
return false;
if (GetRemainingFds() <= 1)
return false;
if (ref[fd])
return false;
struct kevent ke;
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)
{
return false;
}
ref[fd] = eh;
CurrentSetSize++;
ServerInstance->Logs->Log("SOCKET",DEBUG,"New file descriptor: %d", fd);
return true;
}
bool KQueueEngine::DelFd(EventHandler* eh, bool force)
{
int fd = eh->GetFd();
if ((fd < 0) || (fd > GetMaxFds() - 1))
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) && !force)
return false;
CurrentSetSize--;
ref[fd] = NULL;
ServerInstance->Logs->Log("SOCKET",DEBUG,"Remove file descriptor: %d", fd);
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);
kevent(EngineHandle, &ke, 1, 0, 0, NULL);
}
int KQueueEngine::GetMaxFds()
{
if (!MAX_DESCRIPTORS)
{
int mib[2], maxfiles;
size_t len;
mib[0] = CTL_KERN;
mib[1] = KERN_MAXFILES;
len = sizeof(maxfiles);
sysctl(mib, 2, &maxfiles, &len, NULL, 0);
MAX_DESCRIPTORS = maxfiles;
return maxfiles;
}
return MAX_DESCRIPTORS;
}
int KQueueEngine::GetRemainingFds()
{
return GetMaxFds() - CurrentSetSize;
}
int KQueueEngine::DispatchEvents()
{
ts.tv_nsec = 0;
ts.tv_sec = 1;
int i = kevent(EngineHandle, NULL, 0, &ke_list[0], GetMaxFds(), &ts);
TotalEvents += i;
for (int j = 0; j < i; j++)
{
if (ke_list[j].flags & EV_EOF)
{
/* 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!
*/
ErrorEvents++;
if (ref[ke_list[j].ident])
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);
kevent(EngineHandle, &ke, 1, 0, 0, NULL);
WriteEvents++;
if (ref[ke_list[j].ident])
ref[ke_list[j].ident]->HandleEvent(EVENT_WRITE);
}
else
{
ReadEvents++;
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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