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|
/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2009 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 "socketengines/socketengine_poll.h"
#include <ulimit.h>
#ifdef __FreeBSD__
#include <sys/sysctl.h>
#endif
PollEngine::PollEngine(InspIRCd* Instance) : SocketEngine(Instance)
{
// Poll requires no special setup (which is nice).
CurrentSetSize = 0;
MAX_DESCRIPTORS = 0;
ref = new EventHandler* [GetMaxFds()];
events = new struct pollfd[GetMaxFds()];
memset(events, 0, GetMaxFds() * sizeof(struct pollfd));
memset(ref, 0, GetMaxFds() * sizeof(EventHandler*));
}
PollEngine::~PollEngine()
{
// No destruction required, either.
delete[] ref;
delete[] events;
}
bool PollEngine::AddFd(EventHandler* eh)
{
int fd = eh->GetFd();
if ((fd < 0) || (fd > GetMaxFds() - 1))
{
ServerInstance->Logs->Log("SOCKET",DEBUG,"AddFd out of range: (fd: %d, max: %d)", fd, GetMaxFds());
return false;
}
if (GetRemainingFds() <= 1)
{
ServerInstance->Logs->Log("SOCKET",DEBUG,"No remaining FDs cannot add fd: %d", fd);
return false;
}
if (ref[fd])
{
ServerInstance->Logs->Log("SOCKET",DEBUG,"Attempt to add duplicate fd: %d", fd);
return false;
}
ref[fd] = eh;
events[fd].fd = fd;
if (eh->Readable())
{
events[fd].events = POLLIN;
}
else
{
events[fd].events = POLLOUT;
}
ServerInstance->Logs->Log("SOCKET", DEBUG,"New file descriptor: %d (%d)", fd, events[fd].events);
CurrentSetSize++;
return true;
}
void PollEngine::WantWrite(EventHandler* eh)
{
events[eh->GetFd()].events = POLLIN | POLLOUT;
}
bool PollEngine::DelFd(EventHandler* eh, bool force)
{
int fd = eh->GetFd();
if ((fd < 0) || (fd > MAX_DESCRIPTORS))
{
ServerInstance->Logs->Log("SOCKET", DEBUG, "DelFd out of range: (fd: %d, max: %d)", fd, GetMaxFds());
return false;
}
events[fd].fd = -1;
events[fd].events = 0;
CurrentSetSize--;
ref[fd] = NULL;
ServerInstance->Logs->Log("SOCKET", DEBUG, "Remove file descriptor: %d", fd);
return true;
}
int PollEngine::GetMaxFds()
{
#ifndef __FreeBSD__
if (MAX_DESCRIPTORS)
return MAX_DESCRIPTORS;
int max = ulimit(4, 0);
if (max > 0)
{
MAX_DESCRIPTORS = max;
return max;
}
else
{
MAX_DESCRIPTORS = 0;
ServerInstance->Logs->Log("SOCKET", DEFAULT, "ERROR: Can't determine maximum number of open sockets: %s", strerror(errno));
printf("ERROR: Can't determine maximum number of open sockets: %s\n", strerror(errno)));
ServerInstance->Exit(EXIT_STATUS_SOCKETENGINE);
}
return 0;
#else
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;
#endif
}
int PollEngine::GetRemainingFds()
{
return MAX_DESCRIPTORS - CurrentSetSize;
}
int PollEngine::DispatchEvents()
{
int i = poll(events, GetMaxFds() - 1, 1000);
int fd = 0;
socklen_t codesize = sizeof(int);
int errcode;
int processed = 0;
if (i > 0)
{
for (fd = 0; fd < GetMaxFds() - 1 && processed != i; fd++)
{
if (events[fd].revents)
processed++;
if (events[fd].revents & POLLHUP)
{
if (ref[fd])
ref[fd]->HandleEvent(EVENT_ERROR, 0);
continue;
}
if (events[fd].revents & POLLERR)
{
// Get error number
if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
errcode = errno;
if (ref[fd])
ref[fd]->HandleEvent(EVENT_ERROR, errcode);
continue;
}
if (events[fd].revents & POLLOUT)
{
// Switch to wanting read again
// event handlers have to request to write again if they need it
events[fd].events = POLLIN;
if (ref[fd])
ref[fd]->HandleEvent(EVENT_WRITE);
}
if (events[fd].revents & POLLIN)
{
if (ref[fd])
ref[fd]->HandleEvent(EVENT_READ);
}
}
}
return i;
}
std::string PollEngine::GetName()
{
return "poll";
}
|
