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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/select.h>
#include "socketengine_select.h"
SelectEngine::SelectEngine(InspIRCd* Instance) : SocketEngine(Instance)
{
ServerInstance->Log(DEBUG,"SelectEngine::SelectEngine()");
EngineHandle = 0;
CurrentSetSize = 0;
memset(writeable, 0, sizeof(writeable));
}
SelectEngine::~SelectEngine()
{
ServerInstance->Log(DEBUG,"SelectEngine::~SelectEngine()");
}
bool SelectEngine::AddFd(EventHandler* eh)
{
int fd = eh->GetFd();
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;
}
fds[fd] = fd;
if (ref[fd])
return false;
ref[fd] = eh;
ServerInstance->Log(DEBUG,"Add socket %d",fd);
CurrentSetSize++;
return true;
}
void SelectEngine::WantWrite(EventHandler* eh)
{
int fd = eh->GetFd();
writeable[fd] = true;
ServerInstance->Log(DEBUG,"Set %d to writeable", fd);
}
bool SelectEngine::DelFd(EventHandler* eh)
{
int fd = eh->GetFd();
ServerInstance->Log(DEBUG,"SelectEngine::DelFd(%d)",fd);
if ((fd < 0) || (fd > MAX_DESCRIPTORS))
return false;
std::map<int,int>::iterator t = fds.find(fd);
if (t != fds.end())
{
fds.erase(t);
ServerInstance->Log(DEBUG,"Deleted fd %d",fd);
}
CurrentSetSize--;
ref[fd] = NULL;
return true;
}
int SelectEngine::GetMaxFds()
{
return FD_SETSIZE;
}
int SelectEngine::GetRemainingFds()
{
return FD_SETSIZE - CurrentSetSize;
}
int SelectEngine::DispatchEvents()
{
int result = 0;
timeval tval;
int sresult = 0;
EventHandler* ev[MAX_DESCRIPTORS];
FD_ZERO(&wfdset);
FD_ZERO(&rfdset);
for (std::map<int,int>::iterator a = fds.begin(); a != fds.end(); a++)
{
if (ref[a->second]->Readable())
FD_SET (a->second, &rfdset);
else
FD_SET (a->second, &wfdset);
if (writeable[a->second])
FD_SET (a->second, &wfdset);
}
tval.tv_sec = 0;
tval.tv_usec = 50L;
sresult = select(FD_SETSIZE, &rfdset, &wfdset, NULL, &tval);
if (sresult > 0)
{
for (std::map<int,int>::iterator a = fds.begin(); a != fds.end(); a++)
{
if ((FD_ISSET (a->second, &rfdset)) || (FD_ISSET (a->second, &wfdset)))
{
ev[result++] = ref[a->second];
}
}
}
/** An event handler may remove its own descriptor from the list, therefore it is not
* safe to directly iterate over the list and dispatch events there with STL iterators.
* Thats a shame because it makes this code slower and more resource intensive, but maybe
* the user should stop using select(), as select() smells anyway.
*/
for (int i = 0; i < result; i++)
{
ServerInstance->Log(DEBUG,"Handle %s event on fd %d",writeable[ev[i]->GetFd()] || !ev[i]->Readable() ? "write" : "read", ev[i]->GetFd());
if (writeable[ev[i]->GetFd()])
{
ev[i]->HandleEvent(EVENT_WRITE);
writeable[ev[i]->GetFd()] = false;
}
else
{
ev[i]->HandleEvent(ev[i]->Readable() ? EVENT_READ : EVENT_WRITE);
}
}
return result;
}
std::string SelectEngine::GetName()
{
return "select";
}
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