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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mplexer.hh"
#include "sstuff.hh"
#include <iostream>
#include <unistd.h>
#include "misc.hh"
#include "syncres.hh"
#ifdef __linux__
#include <sys/epoll.h>
#endif
#include "namespaces.hh"
#include "namespaces.hh"
class EpollFDMultiplexer : public FDMultiplexer
{
public:
EpollFDMultiplexer();
virtual ~EpollFDMultiplexer()
{
close(d_epollfd);
}
virtual int run(struct timeval* tv);
virtual void addFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const funcparam_t& parameter);
virtual void removeFD(callbackmap_t& cbmap, int fd);
string getName()
{
return "epoll";
}
private:
int d_epollfd;
boost::shared_array<epoll_event> d_eevents;
static int s_maxevents; // not a hard maximum
};
static FDMultiplexer* makeEpoll()
{
return new EpollFDMultiplexer();
}
static struct EpollRegisterOurselves
{
EpollRegisterOurselves() {
FDMultiplexer::getMultiplexerMap().insert(make_pair(0, &makeEpoll)); // priority 0!
}
} doItEpoll;
int EpollFDMultiplexer::s_maxevents=1024;
EpollFDMultiplexer::EpollFDMultiplexer() : d_eevents(new epoll_event[s_maxevents])
{
d_epollfd=epoll_create(s_maxevents); // not hard max
if(d_epollfd < 0)
throw FDMultiplexerException("Setting up epoll: "+stringerror());
int fd=socket(AF_INET, SOCK_DGRAM, 0); // for self-test
if(fd < 0)
return;
try {
addReadFD(fd, 0);
removeReadFD(fd);
close(fd);
return;
}
catch(FDMultiplexerException &fe) {
close(fd);
close(d_epollfd);
throw FDMultiplexerException("epoll multiplexer failed self-test: "+string(fe.what()));
}
}
void EpollFDMultiplexer::addFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const funcparam_t& parameter)
{
accountingAddFD(cbmap, fd, toDo, parameter);
struct epoll_event eevent;
eevent.events = (&cbmap == &d_readCallbacks) ? EPOLLIN : EPOLLOUT;
eevent.data.u64=0; // placate valgrind (I love it so much)
eevent.data.fd=fd;
if(epoll_ctl(d_epollfd, EPOLL_CTL_ADD, fd, &eevent) < 0) {
cbmap.erase(fd);
throw FDMultiplexerException("Adding fd to epoll set: "+stringerror());
}
}
void EpollFDMultiplexer::removeFD(callbackmap_t& cbmap, int fd)
{
if(!cbmap.erase(fd))
throw FDMultiplexerException("Tried to remove unlisted fd "+std::to_string(fd)+ " from multiplexer");
struct epoll_event dummy;
dummy.events = 0;
dummy.data.u64 = 0;
if(epoll_ctl(d_epollfd, EPOLL_CTL_DEL, fd, &dummy) < 0)
throw FDMultiplexerException("Removing fd from epoll set: "+stringerror());
}
int EpollFDMultiplexer::run(struct timeval* now)
{
if(d_inrun) {
throw FDMultiplexerException("FDMultiplexer::run() is not reentrant!\n");
}
int ret=epoll_wait(d_epollfd, d_eevents.get(), s_maxevents, 500);
gettimeofday(now,0); // MANDATORY
if(ret < 0 && errno!=EINTR)
throw FDMultiplexerException("epoll returned error: "+stringerror());
if(ret < 1) // thanks AB!
return 0;
d_inrun=true;
for(int n=0; n < ret; ++n) {
d_iter=d_readCallbacks.find(d_eevents[n].data.fd);
if(d_iter != d_readCallbacks.end()) {
d_iter->second.d_callback(d_iter->first, d_iter->second.d_parameter);
continue; // so we don't refind ourselves as writable!
}
d_iter=d_writeCallbacks.find(d_eevents[n].data.fd);
if(d_iter != d_writeCallbacks.end()) {
d_iter->second.d_callback(d_iter->first, d_iter->second.d_parameter);
}
}
d_inrun=false;
return 0;
}
#if 0
void acceptData(int fd, funcparam_t& parameter)
{
cout<<"Have data on fd "<<fd<<endl;
Socket* sock=funcparam_t_cast<Socket*>(parameter);
string packet;
IPEndpoint rem;
sock->recvFrom(packet, rem);
cout<<"Received "<<packet.size()<<" bytes!\n";
}
int main()
{
Socket s(AF_INET, SOCK_DGRAM);
IPEndpoint loc("0.0.0.0", 2000);
s.bind(loc);
EpollFDMultiplexer sfm;
sfm.addReadFD(s.getHandle(), &acceptData, &s);
for(int n=0; n < 100 ; ++n) {
sfm.run();
}
sfm.removeReadFD(s.getHandle());
sfm.removeReadFD(s.getHandle());
}
#endif
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