pdns/kqueuemplexer.cc

   1 /*
   2  * This file is part of PowerDNS or dnsdist.
   3  * Copyright -- PowerDNS.COM B.V. and its contributors
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * In addition, for the avoidance of any doubt, permission is granted to
  10  * link this program with OpenSSL and to (re)distribute the binaries
  11  * produced as the result of such linking.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25 #include "mplexer.hh"
  26 #include "sstuff.hh"
  27 #include <iostream>
  28 #include <unistd.h>
  29 #include "misc.hh"
  30 #include "syncres.hh"
  31 #include <sys/types.h>
  32 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
  33 #include <sys/event.h>
  34 #endif
  35 #include <sys/time.h>
  36
  37 #include "namespaces.hh"
  38 #include "namespaces.hh"
  39
  40 class KqueueFDMultiplexer : public FDMultiplexer
  41 {
  42 public:
  43   KqueueFDMultiplexer();
  44   virtual ~KqueueFDMultiplexer()
  45   {
  46     close(d_kqueuefd);
  47   }
  48
  49   virtual int run(struct timeval* tv);
  50
  51   virtual void addFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const boost::any& parameter);
  52   virtual void removeFD(callbackmap_t& cbmap, int fd);
  53   string getName()
  54   {
  55     return "kqueue";
  56   }
  57 private:
  58   int d_kqueuefd;
  59   boost::shared_array<struct kevent> d_kevents;
  60   static unsigned int s_maxevents; // not a hard maximum
  61 };
  62
  63 unsigned int KqueueFDMultiplexer::s_maxevents=1024;
  64
  65 static FDMultiplexer* make()
  66 {
  67   return new KqueueFDMultiplexer();
  68 }
  69
  70 static struct KqueueRegisterOurselves
  71 {
  72   KqueueRegisterOurselves() {
  73     FDMultiplexer::getMultiplexerMap().insert(make_pair(0, &make)); // priority 0!
  74   }
  75 } kQueuedoIt;
  76
  77 KqueueFDMultiplexer::KqueueFDMultiplexer() : d_kevents(new struct kevent[s_maxevents])
  78 {
  79   d_kqueuefd=kqueue();
  80   if(d_kqueuefd < 0)
  81     throw FDMultiplexerException("Setting up kqueue: "+stringerror());
  82 }
  83
  84 void KqueueFDMultiplexer::addFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const boost::any& parameter)
  85 {
  86   accountingAddFD(cbmap, fd, toDo, parameter);
  87
  88   struct kevent kqevent;
  89   EV_SET(&kqevent, fd, (&cbmap == &d_readCallbacks) ? EVFILT_READ : EVFILT_WRITE, EV_ADD, 0,0,0);
  90
  91   if(kevent(d_kqueuefd, &kqevent, 1, 0, 0, 0) < 0) {
  92     cbmap.erase(fd);
  93     throw FDMultiplexerException("Adding fd to kqueue set: "+stringerror());
  94   }
  95 }
  96
  97 void KqueueFDMultiplexer::removeFD(callbackmap_t& cbmap, int fd)
  98 {
  99   accountingRemoveFD(cbmap, fd);
 100
 101   struct kevent kqevent;
 102   EV_SET(&kqevent, fd, (&cbmap == &d_readCallbacks) ? EVFILT_READ : EVFILT_WRITE, EV_DELETE, 0,0,0);
 103
 104   if(kevent(d_kqueuefd, &kqevent, 1, 0, 0, 0) < 0) // ponder putting Callback back on the map..
 105     throw FDMultiplexerException("Removing fd from kqueue set: "+stringerror());
 106 }
 107
 108 int KqueueFDMultiplexer::run(struct timeval* now)
 109 {
 110   if(d_inrun) {
 111     throw FDMultiplexerException("FDMultiplexer::run() is not reentrant!\n");
 112   }
 113
 114   struct timespec ts;
 115   ts.tv_sec=0;
 116   ts.tv_nsec=500000000U;
 117
 118   int ret=kevent(d_kqueuefd, 0, 0, d_kevents.get(), s_maxevents, &ts);
 119   gettimeofday(now,0); // MANDATORY!
 120
 121   if(ret < 0 && errno!=EINTR)
 122     throw FDMultiplexerException("kqueue returned error: "+stringerror());
 123
 124   if(ret < 0) // nothing - thanks AB!
 125     return 0;
 126
 127   d_inrun=true;
 128
 129   for(int n=0; n < ret; ++n) {
 130     d_iter=d_readCallbacks.find(d_kevents[n].ident);
 131     if(d_iter != d_readCallbacks.end()) {
 132       d_iter->second.d_callback(d_iter->first, d_iter->second.d_parameter);
 133       continue; // so we don't find ourselves as writable again
 134     }
 135
 136     d_iter=d_writeCallbacks.find(d_kevents[n].ident);
 137
 138     if(d_iter != d_writeCallbacks.end()) {
 139       d_iter->second.d_callback(d_iter->first, d_iter->second.d_parameter);
 140     }
 141   }
 142
 143   d_inrun=false;
 144   return 0;
 145 }
 146
 147 #if 0
 148 void acceptData(int fd, boost::any& parameter)
 149 {
 150   cout<<"Have data on fd "<<fd<<endl;
 151   Socket* sock=boost::any_cast<Socket*>(parameter);
 152   string packet;
 153   IPEndpoint rem;
 154   sock->recvFrom(packet, rem);
 155   cout<<"Received "<<packet.size()<<" bytes!\n";
 156 }
 157
 158 int main()
 159 {
 160   Socket s(AF_INET, SOCK_DGRAM);
 161
 162   IPEndpoint loc("0.0.0.0", 2000);
 163   s.bind(loc);
 164
 165   KqueueFDMultiplexer sfm;
 166
 167   sfm.addReadFD(s.getHandle(), &acceptData, &s);
 168
 169   for(int n=0; n < 100 ; ++n) {
 170     sfm.run();
 171   }
 172   sfm.removeReadFD(s.getHandle());
 173   sfm.removeReadFD(s.getHandle());
 174 }
 175 #endif
 176
 177
 178