src/socketengine_epoll.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include <sys/epoll.h>
  16 #include "socketengine_epoll.h"
  17
  18 EPollEngine::EPollEngine(InspIRCd* Instance) : SocketEngine(Instance)
  19 {
  20         EngineHandle = epoll_create(MAX_DESCRIPTORS);
  21
  22         if (EngineHandle == -1)
  23         {
  24                 ServerInstance->Log(SPARSE,"ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features.");
  25                 ServerInstance->Log(SPARSE,"ERROR: this is a fatal error, exiting now.");
  26                 printf("ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features.");
  27                 printf("ERROR: this is a fatal error, exiting now.");
  28                 InspIRCd::Exit(ERROR);
  29         }
  30         CurrentSetSize = 0;
  31 }
  32
  33 EPollEngine::~EPollEngine()
  34 {
  35         close(EngineHandle);
  36 }
  37
  38 bool EPollEngine::AddFd(EventHandler* eh)
  39 {
  40         int fd = eh->GetFd();
  41         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
  42         {
  43                 ServerInstance->Log(DEBUG,"ERROR: FD of %d added above max of %d",fd,MAX_DESCRIPTORS);
  44                 return false;
  45         }
  46         if (GetRemainingFds() <= 1)
  47         {
  48                 ServerInstance->Log(DEBUG,"ERROR: System out of file descriptors!");
  49                 return false;
  50         }
  51         if (ref[fd])
  52         {
  53                 ServerInstance->Log(DEBUG,"Slot %d already occupied",fd);
  54                 return false;
  55         }
  56
  57         ref[fd] = eh;
  58
  59         ServerInstance->Log(DEBUG,"***** Add socket %d",fd);
  60
  61         struct epoll_event ev;
  62         memset(&ev,0,sizeof(struct epoll_event));
  63         ServerInstance->Log(DEBUG,"epoll: Add socket to events, ep=%d socket=%d",EngineHandle,fd);
  64         eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
  65         ev.data.fd = fd;
  66         int i = epoll_ctl(EngineHandle, EPOLL_CTL_ADD, fd, &ev);
  67         if (i < 0)
  68         {
  69                 ServerInstance->Log(DEBUG,"epoll: List insertion failure!");
  70                 return false;
  71         }
  72
  73         CurrentSetSize++;
  74         return true;
  75 }
  76
  77 void EPollEngine::WantWrite(EventHandler* eh)
  78 {
  79         /** Use oneshot so that the system removes the writeable
  80          * status for us and saves us a call.
  81          */
  82         struct epoll_event ev;
  83         memset(&ev,0,sizeof(struct epoll_event));
  84         ev.events = EPOLLOUT;
  85         ev.data.fd = eh->GetFd();
  86         int i = epoll_ctl(EngineHandle, EPOLL_CTL_MOD, eh->GetFd(), &ev);
  87         if (i < 0)
  88         {
  89                 ServerInstance->Log(DEBUG,"epoll: Could not set want write on fd %d!",eh->GetFd());
  90         }
  91 }
  92
  93 bool EPollEngine::DelFd(EventHandler* eh)
  94 {
  95         ServerInstance->Log(DEBUG,"EPollEngine::DelFd(%d)",eh->GetFd());
  96
  97         int fd = eh->GetFd();
  98         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
  99                 return false;
 100
 101         struct epoll_event ev;
 102         memset(&ev,0,sizeof(struct epoll_event));
 103         eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
 104         ev.data.fd = fd;
 105         int i = epoll_ctl(EngineHandle, EPOLL_CTL_DEL, fd, &ev);
 106
 107         if (i < 0)
 108         {
 109                 ServerInstance->Log(DEBUG,"epoll: List deletion failure: %s",strerror(errno));
 110                 return false;
 111         }
 112
 113         CurrentSetSize--;
 114         ref[fd] = NULL;
 115
 116         return true;
 117 }
 118
 119 int EPollEngine::GetMaxFds()
 120 {
 121         return MAX_DESCRIPTORS;
 122 }
 123
 124 int EPollEngine::GetRemainingFds()
 125 {
 126         return MAX_DESCRIPTORS - CurrentSetSize;
 127 }
 128
 129 int EPollEngine::DispatchEvents()
 130 {
 131         socklen_t codesize;
 132         int errcode;
 133         int i = epoll_wait(EngineHandle, events, MAX_DESCRIPTORS, 150);
 134         for (int j = 0; j < i; j++)
 135         {
 136                 ServerInstance->Log(DEBUG,"Handle %s event on fd %d",events[j].events & EPOLLOUT ? "write" : "read", events[j].data.fd);
 137                 if (events[j].events & EPOLLHUP)
 138                 {
 139                         ServerInstance->Log(DEBUG,"Handle error event on fd %d", events[j].data.fd);
 140                         if (ref[events[j].data.fd])
 141                                 ref[events[j].data.fd]->HandleEvent(EVENT_ERROR, 0);
 142                         continue;
 143                 }
 144                 if (events[j].events & EPOLLERR)
 145                 {
 146                         /* Get error number */
 147                         if (getsockopt(events[j].data.fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
 148                                 errcode = errno;
 149                         ServerInstance->Log(DEBUG,"Handle error event on fd %d: %s", events[j].data.fd, strerror(errcode));
 150                         if (ref[events[j].data.fd])
 151                                 ref[events[j].data.fd]->HandleEvent(EVENT_ERROR, errcode);
 152                         continue;
 153                 }
 154                 if (events[j].events & EPOLLOUT)
 155                 {
 156                         struct epoll_event ev;
 157                         memset(&ev,0,sizeof(struct epoll_event));
 158                         ev.events = EPOLLIN;
 159                         ev.data.fd = events[j].data.fd;
 160                         int i = epoll_ctl(EngineHandle, EPOLL_CTL_MOD, events[j].data.fd, &ev);
 161                         if (i < 0)
 162                         {
 163                                 ServerInstance->Log(DEBUG,"epoll: Could not reset fd %d!", events[j].data.fd);
 164                         }
 165                         if (ref[events[j].data.fd])
 166                                 ref[events[j].data.fd]->HandleEvent(EVENT_WRITE);
 167                 }
 168                 else
 169                 {
 170                         if (ref[events[j].data.fd])
 171                                 ref[events[j].data.fd]->HandleEvent(EVENT_READ);
 172                 }
 173         }
 174
 175         return i;
 176 }
 177
 178 std::string EPollEngine::GetName()
 179 {
 180         return "epoll";
 181 }
 182