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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"
#ifndef WINDOWS
#include <sys/select.h>
#endif // WINDOWS
#include "socketengines/socketengine_select.h"
SelectEngine::SelectEngine(InspIRCd* Instance) : SocketEngine(Instance)
{
MAX_DESCRIPTORS = FD_SETSIZE;
EngineHandle = 0;
CurrentSetSize = 0;
writeable = new bool [GetMaxFds()];
memset(writeable, 0, sizeof(writeable));
ref = new EventHandler* [GetMaxFds()];
memset(ref, 0, GetMaxFds() * sizeof(EventHandler*));
}
SelectEngine::~SelectEngine()
{
delete[] ref;
}
bool SelectEngine::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;
fds[fd] = fd;
ref[fd] = eh;
CurrentSetSize++;
ServerInstance->Logs->Log("SOCKET",DEBUG,"New file descriptor: %d", fd);
return true;
}
void SelectEngine::WantWrite(EventHandler* eh)
{
writeable[eh->GetFd()] = true;
}
bool SelectEngine::DelFd(EventHandler* eh, bool force)
{
int fd = eh->GetFd();
if ((fd < 0) || (fd > GetMaxFds() - 1))
return false;
std::map<int,int>::iterator t = fds.find(fd);
if (t != fds.end())
fds.erase(t);
CurrentSetSize--;
ref[fd] = NULL;
ServerInstance->Logs->Log("SOCKET",DEBUG,"Remove file descriptor: %d", fd);
return true;
}
int SelectEngine::GetMaxFds()
{
return FD_SETSIZE;
}
int SelectEngine::GetRemainingFds()
{
return GetMaxFds() - CurrentSetSize;
}
int SelectEngine::DispatchEvents()
{
timeval tval;
int sresult = 0;
socklen_t codesize;
int errcode = 0;
FD_ZERO(&wfdset);
FD_ZERO(&rfdset);
FD_ZERO(&errfdset);
/* Populate the select FD set (this is why select sucks compared to epoll, kqueue, IOCP) */
for (std::map<int,int>::iterator a = fds.begin(); a != fds.end(); a++)
{
if (ref[a->second]->Readable())
/* Read notifications */
FD_SET (a->second, &rfdset);
else
/* Write notifications */
FD_SET (a->second, &wfdset);
/* Explicitly one-time writeable */
if (writeable[a->second])
FD_SET (a->second, &wfdset);
/* All sockets must receive error notifications regardless */
FD_SET (a->second, &errfdset);
}
/* One second waits */
tval.tv_sec = 1;
tval.tv_usec = 0;
sresult = select(FD_SETSIZE, &rfdset, &wfdset, &errfdset, &tval);
/* Nothing to process this time around */
if (sresult < 1)
return 0;
/* Safe assumption (as of 1.1 anyway) that a socket can't remove itself from the list in the middle of the loop */
for (std::map<int,int>::iterator a = fds.begin(); a != fds.end(); a++)
{
EventHandler* ev = ref[a->second];
if (ev)
{
if (FD_ISSET (ev->GetFd(), &errfdset))
{
ErrorEvents++;
if (getsockopt(ev->GetFd(), SOL_SOCKET, SO_ERROR, (char*)&errcode, &codesize) < 0)
errcode = errno;
ev->HandleEvent(EVENT_ERROR, errcode);
continue;
}
else
{
/* NOTE: This is a pair of seperate if statements as the socket
* may be in both read and writeable state at the same time.
* If an error event occurs above it is not worth processing the
* read and write states even if set.
*/
if (FD_ISSET (ev->GetFd(), &wfdset))
{
WriteEvents++;
writeable[ev->GetFd()] = false;
ev->HandleEvent(EVENT_WRITE);
}
if (FD_ISSET (ev->GetFd(), &rfdset))
{
ReadEvents++;
ev->HandleEvent(EVENT_READ);
}
}
}
}
return sresult;
}
std::string SelectEngine::GetName()
{
return "select";
}
|
