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: %s", strerror(errno));
  26                 ServerInstance->Log(SPARSE,"ERROR: Your kernel probably does not have the proper features. This is a fatal error, exiting now.");
  27                 printf("ERROR: Could not initialize socket engine: %s\n", strerror(errno));
  28                 printf("ERROR: Your kernel probably does not have the proper features. This is a fatal error, exiting now.\n");
  29                 ServerInstance->Exit(EXIT_STATUS_SOCKETENGINE);
  30         }
  31         CurrentSetSize = 0;
  32 }
  33
  34 EPollEngine::~EPollEngine()
  35 {
  36         this->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,"Out of range FD");
  45                 return false;
  46         }
  47
  48         if (GetRemainingFds() <= 1)
  49                 return false;
  50
  51         if (ref[fd])
  52         {
  53                 ServerInstance->Log(DEBUG,"Ref occupied!");
  54                 return false;
  55         }
  56
  57         struct epoll_event ev;
  58         memset(&ev,0,sizeof(struct epoll_event));
  59         eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
  60         ev.data.fd = fd;
  61         int i = epoll_ctl(EngineHandle, EPOLL_CTL_ADD, fd, &ev);
  62         if (i < 0)
  63         {
  64                 return false;
  65         }
  66
  67         ServerInstance->Log(DEBUG,"New file descriptor: %d", fd);
  68
  69         ref[fd] = eh;
  70         CurrentSetSize++;
  71         return true;
  72 }
  73
  74 void EPollEngine::WantWrite(EventHandler* eh)
  75 {
  76         /** Use oneshot so that the system removes the writeable
  77          * status for us and saves us a call.
  78          */
  79         struct epoll_event ev;
  80         memset(&ev,0,sizeof(struct epoll_event));
  81         ev.events = EPOLLOUT;
  82         ev.data.fd = eh->GetFd();
  83         epoll_ctl(EngineHandle, EPOLL_CTL_MOD, eh->GetFd(), &ev);
  84 }
  85
  86 bool EPollEngine::DelFd(EventHandler* eh, bool force)
  87 {
  88         int fd = eh->GetFd();
  89         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
  90                 return false;
  91
  92         ref[fd] = NULL;
  93         CurrentSetSize--;
  94
  95         struct epoll_event ev;
  96         memset(&ev,0,sizeof(struct epoll_event));
  97         eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
  98         ev.data.fd = fd;
  99         int i = epoll_ctl(EngineHandle, EPOLL_CTL_DEL, fd, &ev);
 100
 101         if (i < 0 && !force)
 102         {
 103                 ServerInstance->Log(DEBUG,"Cant remove socket: %s", strerror(errno));
 104                 return false;
 105         }
 106
 107         ServerInstance->Log(DEBUG,"Remove file descriptor: %d", fd);
 108         return true;
 109 }
 110
 111 int EPollEngine::GetMaxFds()
 112 {
 113         return MAX_DESCRIPTORS;
 114 }
 115
 116 int EPollEngine::GetRemainingFds()
 117 {
 118         return MAX_DESCRIPTORS - CurrentSetSize;
 119 }
 120
 121 int EPollEngine::DispatchEvents()
 122 {
 123         socklen_t codesize;
 124         int errcode;
 125         int i = epoll_wait(EngineHandle, events, MAX_DESCRIPTORS, 1000);
 126         for (int j = 0; j < i; j++)
 127         {
 128                 if (events[j].events & EPOLLHUP)
 129                 {
 130                         if (ref[events[j].data.fd])
 131                                 ref[events[j].data.fd]->HandleEvent(EVENT_ERROR, 0);
 132                         continue;
 133                 }
 134                 if (events[j].events & EPOLLERR)
 135                 {
 136                         /* Get error number */
 137                         if (getsockopt(events[j].data.fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
 138                                 errcode = errno;
 139                         if (ref[events[j].data.fd])
 140                                 ref[events[j].data.fd]->HandleEvent(EVENT_ERROR, errcode);
 141                         continue;
 142                 }
 143                 if (events[j].events & EPOLLOUT)
 144                 {
 145                         struct epoll_event ev;
 146                         memset(&ev,0,sizeof(struct epoll_event));
 147                         ev.events = EPOLLIN;
 148                         ev.data.fd = events[j].data.fd;
 149                         epoll_ctl(EngineHandle, EPOLL_CTL_MOD, events[j].data.fd, &ev);
 150                         if (ref[events[j].data.fd])
 151                                 ref[events[j].data.fd]->HandleEvent(EVENT_WRITE);
 152                 }
 153                 else
 154                 {
 155                         if (ref[events[j].data.fd])
 156                                 ref[events[j].data.fd]->HandleEvent(EVENT_READ);
 157                 }
 158         }
 159
 160         return i;
 161 }
 162
 163 std::string EPollEngine::GetName()
 164 {
 165         return "epoll";
 166 }
 167