src/socketengine_epoll.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 #include "inspircd.h"
  18 #include <sys/epoll.h>
  19 #include "socketengine_epoll.h"
  20
  21 EPollEngine::EPollEngine(InspIRCd* Instance) : SocketEngine(Instance)
  22 {
  23         EngineHandle = epoll_create(MAX_DESCRIPTORS);
  24
  25         if (EngineHandle == -1)
  26         {
  27                 ServerInstance->Log(SPARSE,"ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features.");
  28                 ServerInstance->Log(SPARSE,"ERROR: this is a fatal error, exiting now.");
  29                 printf("ERROR: Could not initialize socket engine. Your kernel probably does not have the proper features.");
  30                 printf("ERROR: this is a fatal error, exiting now.");
  31                 InspIRCd::Exit(ERROR);
  32         }
  33         CurrentSetSize = 0;
  34 }
  35
  36 EPollEngine::~EPollEngine()
  37 {
  38         close(EngineHandle);
  39 }
  40
  41 bool EPollEngine::AddFd(EventHandler* eh)
  42 {
  43         int fd = eh->GetFd();
  44         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
  45         {
  46                 ServerInstance->Log(DEBUG,"ERROR: FD of %d added above max of %d",fd,MAX_DESCRIPTORS);
  47                 return false;
  48         }
  49         if (GetRemainingFds() <= 1)
  50         {
  51                 ServerInstance->Log(DEBUG,"ERROR: System out of file descriptors!");
  52                 return false;
  53         }
  54         if (ref[fd])
  55         {
  56                 ServerInstance->Log(DEBUG,"Slot %d already occupied",fd);
  57                 return false;
  58         }
  59
  60         ref[fd] = eh;
  61
  62         ServerInstance->Log(DEBUG,"***** Add socket %d",fd);
  63
  64         struct epoll_event ev;
  65         memset(&ev,0,sizeof(struct epoll_event));
  66         ServerInstance->Log(DEBUG,"epoll: Add socket to events, ep=%d socket=%d",EngineHandle,fd);
  67         eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
  68         ev.data.fd = fd;
  69         int i = epoll_ctl(EngineHandle, EPOLL_CTL_ADD, fd, &ev);
  70         if (i < 0)
  71         {
  72                 ServerInstance->Log(DEBUG,"epoll: List insertion failure!");
  73                 return false;
  74         }
  75
  76         CurrentSetSize++;
  77         return true;
  78 }
  79
  80 void EPollEngine::WantWrite(EventHandler* eh)
  81 {
  82         /** Use oneshot so that the system removes the writeable
  83          * status for us and saves us a call.
  84          */
  85         struct epoll_event ev;
  86         ev.events = EPOLLOUT;
  87         ev.data.fd = eh->GetFd();
  88         int i = epoll_ctl(EngineHandle, EPOLL_CTL_MOD, eh->GetFd(), &ev);
  89         if (i < 0)
  90         {
  91                 ServerInstance->Log(DEBUG,"epoll: Could not set want write on fd %d!",eh->GetFd());
  92         }
  93 }
  94
  95 bool EPollEngine::DelFd(EventHandler* eh)
  96 {
  97         ServerInstance->Log(DEBUG,"EPollEngine::DelFd(%d)",eh->GetFd());
  98
  99         int fd = eh->GetFd();
 100         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 101                 return false;
 102
 103         struct epoll_event ev;
 104         memset(&ev,0,sizeof(struct epoll_event));
 105         eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
 106         ev.data.fd = fd;
 107         int i = epoll_ctl(EngineHandle, EPOLL_CTL_DEL, fd, &ev);
 108
 109         if (i < 0)
 110         {
 111                 ServerInstance->Log(DEBUG,"epoll: List deletion failure: %s",strerror(errno));
 112                 return false;
 113         }
 114
 115         CurrentSetSize--;
 116         ref[fd] = NULL;
 117
 118         return true;
 119 }
 120
 121 int EPollEngine::GetMaxFds()
 122 {
 123         return MAX_DESCRIPTORS;
 124 }
 125
 126 int EPollEngine::GetRemainingFds()
 127 {
 128         return MAX_DESCRIPTORS - CurrentSetSize;
 129 }
 130
 131 int EPollEngine::DispatchEvents()
 132 {
 133         socklen_t codesize;
 134         int errcode;
 135         int i = epoll_wait(EngineHandle, events, MAX_DESCRIPTORS, 150);
 136         for (int j = 0; j < i; j++)
 137         {
 138                 ServerInstance->Log(DEBUG,"Handle %s event on fd %d",events[j].events & EPOLLOUT ? "write" : "read", events[j].data.fd);
 139                 if (events[j].events & EPOLLHUP)
 140                 {
 141                         ServerInstance->Log(DEBUG,"Handle error event on fd %d", events[j].data.fd);
 142                         ref[events[j].data.fd]->HandleEvent(EVENT_ERROR, 0);
 143                         continue;
 144                 }
 145                 if (events[j].events & EPOLLERR)
 146                 {
 147                         /* Get error number */
 148                         if (getsockopt(events[j].data.fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
 149                                 errcode = errno;
 150                         ServerInstance->Log(DEBUG,"Handle error event on fd %d: %s", events[j].data.fd, strerror(errcode));
 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                         ev.events = EPOLLIN;
 158                         ev.data.fd = events[j].data.fd;
 159                         int i = epoll_ctl(EngineHandle, EPOLL_CTL_MOD, events[j].data.fd, &ev);
 160                         if (i < 0)
 161                         {
 162                                 ServerInstance->Log(DEBUG,"epoll: Could not reset fd %d!", events[j].data.fd);
 163                         }
 164                         if (ref[events[j].data.fd])
 165                                 ref[events[j].data.fd]->HandleEvent(EVENT_WRITE);
 166                 }
 167                 else
 168                 {
 169                         if (ref[events[j].data.fd])
 170                                 ref[events[j].data.fd]->HandleEvent(EVENT_READ);
 171                 }
 172         }
 173
 174         return i;
 175 }
 176
 177 std::string EPollEngine::GetName()
 178 {
 179         return "epoll";
 180 }
 181