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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 <sys/types.h>
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__)
#include <sys/event.h>
#endif
#include <sys/time.h>
#include "namespaces.hh"
class KqueueFDMultiplexer : public FDMultiplexer
{
public:
KqueueFDMultiplexer();
virtual ~KqueueFDMultiplexer()
{
close(d_kqueuefd);
}
virtual int run(struct timeval* tv, int timeout=500) override;
virtual void getAvailableFDs(std::vector<int>& fds, int timeout) override;
virtual void addFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const boost::any& parameter, const struct timeval* ttd=nullptr) override;
virtual void removeFD(callbackmap_t& cbmap, int fd) override;
string getName() const override
{
return "kqueue";
}
private:
int d_kqueuefd;
boost::shared_array<struct kevent> d_kevents;
static unsigned int s_maxevents; // not a hard maximum
};
unsigned int KqueueFDMultiplexer::s_maxevents=1024;
static FDMultiplexer* make()
{
return new KqueueFDMultiplexer();
}
static struct KqueueRegisterOurselves
{
KqueueRegisterOurselves() {
FDMultiplexer::getMultiplexerMap().insert(make_pair(0, &make)); // priority 0!
}
} kQueuedoIt;
KqueueFDMultiplexer::KqueueFDMultiplexer() : d_kevents(new struct kevent[s_maxevents])
{
d_kqueuefd=kqueue();
if(d_kqueuefd < 0)
throw FDMultiplexerException("Setting up kqueue: "+stringerror());
}
void KqueueFDMultiplexer::addFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const boost::any& parameter, const struct timeval* ttd)
{
accountingAddFD(cbmap, fd, toDo, parameter, ttd);
struct kevent kqevent;
EV_SET(&kqevent, fd, (&cbmap == &d_readCallbacks) ? EVFILT_READ : EVFILT_WRITE, EV_ADD, 0,0,0);
if(kevent(d_kqueuefd, &kqevent, 1, 0, 0, 0) < 0) {
cbmap.erase(fd);
throw FDMultiplexerException("Adding fd to kqueue set: "+stringerror());
}
}
void KqueueFDMultiplexer::removeFD(callbackmap_t& cbmap, int fd)
{
accountingRemoveFD(cbmap, fd);
struct kevent kqevent;
EV_SET(&kqevent, fd, (&cbmap == &d_readCallbacks) ? EVFILT_READ : EVFILT_WRITE, EV_DELETE, 0,0,0);
if(kevent(d_kqueuefd, &kqevent, 1, 0, 0, 0) < 0) // ponder putting Callback back on the map..
throw FDMultiplexerException("Removing fd from kqueue set: "+stringerror());
}
void KqueueFDMultiplexer::getAvailableFDs(std::vector<int>& fds, int timeout)
{
struct timespec ts;
ts.tv_sec=timeout/1000;
ts.tv_nsec=(timeout % 1000) * 1000000;
int ret = kevent(d_kqueuefd, 0, 0, d_kevents.get(), s_maxevents, &ts);
if(ret < 0 && errno != EINTR)
throw FDMultiplexerException("kqueue returned error: "+stringerror());
for(int n=0; n < ret; ++n) {
fds.push_back(d_kevents[n].ident);
}
}
int KqueueFDMultiplexer::run(struct timeval* now, int timeout)
{
if(d_inrun) {
throw FDMultiplexerException("FDMultiplexer::run() is not reentrant!\n");
}
struct timespec ts;
ts.tv_sec=timeout/1000;
ts.tv_nsec=(timeout % 1000) * 1000000;
int ret=kevent(d_kqueuefd, 0, 0, d_kevents.get(), s_maxevents, &ts);
gettimeofday(now,0); // MANDATORY!
if(ret < 0 && errno!=EINTR)
throw FDMultiplexerException("kqueue returned error: "+stringerror());
if(ret < 0) // nothing - thanks AB!
return 0;
d_inrun=true;
for(int n=0; n < ret; ++n) {
d_iter=d_readCallbacks.find(d_kevents[n].ident);
if(d_iter != d_readCallbacks.end()) {
d_iter->d_callback(d_iter->d_fd, d_iter->d_parameter);
continue; // so we don't find ourselves as writable again
}
d_iter=d_writeCallbacks.find(d_kevents[n].ident);
if(d_iter != d_writeCallbacks.end()) {
d_iter->d_callback(d_iter->d_fd, d_iter->d_parameter);
}
}
d_inrun=false;
return ret;
}
#if 0
void acceptData(int fd, boost::any& parameter)
{
cout<<"Have data on fd "<<fd<<endl;
Socket* sock=boost::any_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);
KqueueFDMultiplexer 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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