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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)
{
EngineHandle = 0;
CurrentSetSize = 0;
memset(writeable, 0, sizeof(writeable));
}
SelectEngine::~SelectEngine()
{
}
bool SelectEngine::AddFd(EventHandler* eh)
{
int fd = eh->GetFd();
if ((fd < 0) || (fd > MAX_DESCRIPTORS))
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 > MAX_DESCRIPTORS))
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 FD_SETSIZE - CurrentSetSize;
}
int SelectEngine::DispatchEvents()
{
int result = 0;
timeval tval;
int sresult = 0;
EventHandler* ev[MAX_DESCRIPTORS];
socklen_t codesize;
int errcode;
FD_ZERO(&wfdset);
FD_ZERO(&rfdset);
FD_ZERO(&errfdset);
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);
FD_SET (a->second, &errfdset);
}
tval.tv_sec = 1;
tval.tv_usec = 0;
sresult = select(FD_SETSIZE, &rfdset, &wfdset, &errfdset, &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)) || FD_ISSET (a->second, &errfdset))
{
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++)
{
if (ev[i])
{
if (FD_ISSET (ev[i]->GetFd(), &errfdset))
{
ErrorEvents++;
if (getsockopt(ev[i]->GetFd(), SOL_SOCKET, SO_ERROR, (char*)&errcode, &codesize) < 0)
errcode = errno;
ev[i]->HandleEvent(EVENT_ERROR, errcode);
continue;
}
else
{
if (writeable[ev[i]->GetFd()])
{
WriteEvents++;
writeable[ev[i]->GetFd()] = false;
ev[i]->HandleEvent(EVENT_WRITE);
}
else
{
if (ev[i]->Readable())
{
ReadEvents++;
ev[i]->HandleEvent(EVENT_READ);
}
else
{
WriteEvents++;
ev[i]->HandleEvent(EVENT_WRITE);
}
}
}
}
}
return result;
}
std::string SelectEngine::GetName()
{
return "select";
}
|
