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 <sys/types.h>
  31 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__)
  32 #include <sys/event.h>
  33 #endif
  34 #include <sys/time.h>
  35
  36 #include "namespaces.hh"
  37
  38 class KqueueFDMultiplexer : public FDMultiplexer
  39 {
  40 public:
  41   KqueueFDMultiplexer();
  42   virtual ~KqueueFDMultiplexer()
  43   {
  44     close(d_kqueuefd);
  45   }
  46
  47   virtual int run(struct timeval* tv, int timeout=500);
  48
  49   virtual void addFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const boost::any& parameter);
  50   virtual void removeFD(callbackmap_t& cbmap, int fd);
  51   string getName()
  52   {
  53     return "kqueue";
  54   }
  55 private:
  56   int d_kqueuefd;
  57   boost::shared_array<struct kevent> d_kevents;
  58   static unsigned int s_maxevents; // not a hard maximum
  59 };
  60
  61 unsigned int KqueueFDMultiplexer::s_maxevents=1024;
  62
  63 static FDMultiplexer* make()
  64 {
  65   return new KqueueFDMultiplexer();
  66 }
  67
  68 static struct KqueueRegisterOurselves
  69 {
  70   KqueueRegisterOurselves() {
  71     FDMultiplexer::getMultiplexerMap().insert(make_pair(0, &make)); // priority 0!
  72   }
  73 } kQueuedoIt;
  74
  75 KqueueFDMultiplexer::KqueueFDMultiplexer() : d_kevents(new struct kevent[s_maxevents])
  76 {
  77   d_kqueuefd=kqueue();
  78   if(d_kqueuefd < 0)
  79     throw FDMultiplexerException("Setting up kqueue: "+stringerror());
  80 }
  81
  82 void KqueueFDMultiplexer::addFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const boost::any& parameter)
  83 {
  84   accountingAddFD(cbmap, fd, toDo, parameter);
  85
  86   struct kevent kqevent;
  87   EV_SET(&kqevent, fd, (&cbmap == &d_readCallbacks) ? EVFILT_READ : EVFILT_WRITE, EV_ADD, 0,0,0);
  88
  89   if(kevent(d_kqueuefd, &kqevent, 1, 0, 0, 0) < 0) {
  90     cbmap.erase(fd);
  91     throw FDMultiplexerException("Adding fd to kqueue set: "+stringerror());
  92   }
  93 }
  94
  95 void KqueueFDMultiplexer::removeFD(callbackmap_t& cbmap, int fd)
  96 {
  97   accountingRemoveFD(cbmap, fd);
  98
  99   struct kevent kqevent;
 100   EV_SET(&kqevent, fd, (&cbmap == &d_readCallbacks) ? EVFILT_READ : EVFILT_WRITE, EV_DELETE, 0,0,0);
 101
 102   if(kevent(d_kqueuefd, &kqevent, 1, 0, 0, 0) < 0) // ponder putting Callback back on the map..
 103     throw FDMultiplexerException("Removing fd from kqueue set: "+stringerror());
 104 }
 105
 106 int KqueueFDMultiplexer::run(struct timeval* now, int timeout)
 107 {
 108   if(d_inrun) {
 109     throw FDMultiplexerException("FDMultiplexer::run() is not reentrant!\n");
 110   }
 111
 112   struct timespec ts;
 113   ts.tv_sec=timeout/1000;
 114   ts.tv_nsec=(timeout % 1000) * 1000000;
 115
 116   int ret=kevent(d_kqueuefd, 0, 0, d_kevents.get(), s_maxevents, &ts);
 117   gettimeofday(now,0); // MANDATORY!
 118
 119   if(ret < 0 && errno!=EINTR)
 120     throw FDMultiplexerException("kqueue returned error: "+stringerror());
 121
 122   if(ret < 0) // nothing - thanks AB!
 123     return 0;
 124
 125   d_inrun=true;
 126
 127   for(int n=0; n < ret; ++n) {
 128     d_iter=d_readCallbacks.find(d_kevents[n].ident);
 129     if(d_iter != d_readCallbacks.end()) {
 130       d_iter->second.d_callback(d_iter->first, d_iter->second.d_parameter);
 131       continue; // so we don't find ourselves as writable again
 132     }
 133
 134     d_iter=d_writeCallbacks.find(d_kevents[n].ident);
 135
 136     if(d_iter != d_writeCallbacks.end()) {
 137       d_iter->second.d_callback(d_iter->first, d_iter->second.d_parameter);
 138     }
 139   }
 140
 141   d_inrun=false;
 142   return ret;
 143 }
 144
 145 #if 0
 146 void acceptData(int fd, boost::any& parameter)
 147 {
 148   cout<<"Have data on fd "<<fd<<endl;
 149   Socket* sock=boost::any_cast<Socket*>(parameter);
 150   string packet;
 151   IPEndpoint rem;
 152   sock->recvFrom(packet, rem);
 153   cout<<"Received "<<packet.size()<<" bytes!\n";
 154 }
 155
 156 int main()
 157 {
 158   Socket s(AF_INET, SOCK_DGRAM);
 159
 160   IPEndpoint loc("0.0.0.0", 2000);
 161   s.bind(loc);
 162
 163   KqueueFDMultiplexer sfm;
 164
 165   sfm.addReadFD(s.getHandle(), &acceptData, &s);
 166
 167   for(int n=0; n < 100 ; ++n) {
 168     sfm.run();
 169   }
 170   sfm.removeReadFD(s.getHandle());
 171   sfm.removeReadFD(s.getHandle());
 172 }
 173 #endif
 174
 175
 176