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 "exitcodes.h"
  16 #include <sys/epoll.h>
  17 #include "socketengine_epoll.h"
  18
  19 EPollEngine::EPollEngine(InspIRCd* Instance) : SocketEngine(Instance)
  20 {
  21         EngineHandle = epoll_create(MAX_DESCRIPTORS);
  22
  23         if (EngineHandle == -1)
  24         {
  25                 ServerInstance->Log(SPARSE,"ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features.");
  26                 ServerInstance->Log(SPARSE,"ERROR: this is a fatal error, exiting now.");
  27                 printf("ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features.");
  28                 printf("ERROR: this is a fatal error, exiting now.");
  29                 InspIRCd::Exit(EXIT_STATUS_SOCKETENGINE);
  30         }
  31         CurrentSetSize = 0;
  32 }
  33
  34 EPollEngine::~EPollEngine()
  35 {
  36         close(EngineHandle);
  37 }
  38
  39 bool EPollEngine::AddFd(EventHandler* eh)
  40 {
  41         int fd = eh->GetFd();
  42         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
  43         {
  44                 ServerInstance->Log(DEBUG,"ERROR: FD of %d added above max of %d",fd,MAX_DESCRIPTORS);
  45                 return false;
  46         }
  47         if (GetRemainingFds() <= 1)
  48         {
  49                 ServerInstance->Log(DEBUG,"ERROR: System out of file descriptors!");
  50                 return false;
  51         }
  52         if (ref[fd])
  53         {
  54                 ServerInstance->Log(DEBUG,"Slot %d already occupied",fd);
  55                 return false;
  56         }
  57
  58         ref[fd] = eh;
  59
  60         ServerInstance->Log(DEBUG,"***** Add socket %d",fd);
  61
  62         struct epoll_event ev;
  63         memset(&ev,0,sizeof(struct epoll_event));
  64         ServerInstance->Log(DEBUG,"epoll: Add socket to events, ep=%d socket=%d",EngineHandle,fd);
  65         eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
  66         ev.data.fd = fd;
  67         int i = epoll_ctl(EngineHandle, EPOLL_CTL_ADD, fd, &ev);
  68         if (i < 0)
  69         {
  70                 ServerInstance->Log(DEBUG,"epoll: List insertion failure!");
  71                 return false;
  72         }
  73
  74         CurrentSetSize++;
  75         return true;
  76 }
  77
  78 void EPollEngine::WantWrite(EventHandler* eh)
  79 {
  80         /** Use oneshot so that the system removes the writeable
  81          * status for us and saves us a call.
  82          */
  83         struct epoll_event ev;
  84         memset(&ev,0,sizeof(struct epoll_event));
  85         ev.events = EPOLLOUT;
  86         ev.data.fd = eh->GetFd();
  87         int i = epoll_ctl(EngineHandle, EPOLL_CTL_MOD, eh->GetFd(), &ev);
  88         if (i < 0)
  89         {
  90                 ServerInstance->Log(DEBUG,"epoll: Could not set want write on fd %d!",eh->GetFd());
  91         }
  92 }
  93
  94 bool EPollEngine::DelFd(EventHandler* eh)
  95 {
  96         int fd = eh->GetFd();
  97         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
  98                 return false;
  99
 100         struct epoll_event ev;
 101         memset(&ev,0,sizeof(struct epoll_event));
 102         eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
 103         ev.data.fd = fd;
 104         int i = epoll_ctl(EngineHandle, EPOLL_CTL_DEL, fd, &ev);
 105
 106         if (i < 0)
 107                 return false;
 108
 109         CurrentSetSize--;
 110         ref[fd] = NULL;
 111
 112         return true;
 113 }
 114
 115 int EPollEngine::GetMaxFds()
 116 {
 117         return MAX_DESCRIPTORS;
 118 }
 119
 120 int EPollEngine::GetRemainingFds()
 121 {
 122         return MAX_DESCRIPTORS - CurrentSetSize;
 123 }
 124
 125 int EPollEngine::DispatchEvents()
 126 {
 127         socklen_t codesize;
 128         int errcode;
 129         int i = epoll_wait(EngineHandle, events, MAX_DESCRIPTORS, 1000);
 130         for (int j = 0; j < i; j++)
 131         {
 132                 if (events[j].events & EPOLLHUP)
 133                 {
 134                         ServerInstance->Log(DEBUG,"Handle error event on fd %d", events[j].data.fd);
 135                         if (ref[events[j].data.fd])
 136                                 ref[events[j].data.fd]->HandleEvent(EVENT_ERROR, 0);
 137                         continue;
 138                 }
 139                 if (events[j].events & EPOLLERR)
 140                 {
 141                         /* Get error number */
 142                         if (getsockopt(events[j].data.fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
 143                                 errcode = errno;
 144                         ServerInstance->Log(DEBUG,"Handle error event on fd %d: %s", events[j].data.fd, strerror(errcode));
 145                         if (ref[events[j].data.fd])
 146                                 ref[events[j].data.fd]->HandleEvent(EVENT_ERROR, errcode);
 147                         continue;
 148                 }
 149                 if (events[j].events & EPOLLOUT)
 150                 {
 151                         struct epoll_event ev;
 152                         memset(&ev,0,sizeof(struct epoll_event));
 153                         ev.events = EPOLLIN;
 154                         ev.data.fd = events[j].data.fd;
 155                         int i = epoll_ctl(EngineHandle, EPOLL_CTL_MOD, events[j].data.fd, &ev);
 156                         if (i < 0)
 157                         {
 158                                 ServerInstance->Log(DEBUG,"epoll: Could not reset fd %d!", events[j].data.fd);
 159                         }
 160                         if (ref[events[j].data.fd])
 161                                 ref[events[j].data.fd]->HandleEvent(EVENT_WRITE);
 162                 }
 163                 else
 164                 {
 165                         if (ref[events[j].data.fd])
 166                                 ref[events[j].data.fd]->HandleEvent(EVENT_READ);
 167                 }
 168         }
 169
 170         return i;
 171 }
 172
 173 std::string EPollEngine::GetName()
 174 {
 175         return "epoll";
 176 }
 177