src/socketengines/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 "socketengines/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         ServerInstance->Log(DEBUG,"Add new fd: %d", eh->GetFd());
  42         int fd = eh->GetFd();
  43         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
  44         {
  45                 ServerInstance->Log(DEBUG,"Out of range FD");
  46                 return false;
  47         }
  48
  49         if (GetRemainingFds() <= 1)
  50                 return false;
  51
  52         if (ref[fd])
  53                 return false;
  54
  55         struct epoll_event ev;
  56         memset(&ev,0,sizeof(struct epoll_event));
  57         eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
  58         ev.data.fd = fd;
  59         int i = epoll_ctl(EngineHandle, EPOLL_CTL_ADD, fd, &ev);
  60         if (i < 0)
  61         {
  62                 return false;
  63         }
  64
  65         ServerInstance->Log(DEBUG,"New file descriptor: %d", fd);
  66
  67         ref[fd] = eh;
  68         CurrentSetSize++;
  69         return true;
  70 }
  71
  72 void EPollEngine::WantWrite(EventHandler* eh)
  73 {
  74         /** Use oneshot so that the system removes the writeable
  75          * status for us and saves us a call.
  76          */
  77         struct epoll_event ev;
  78         memset(&ev,0,sizeof(struct epoll_event));
  79         ev.events = EPOLLOUT;
  80         ev.data.fd = eh->GetFd();
  81         epoll_ctl(EngineHandle, EPOLL_CTL_MOD, eh->GetFd(), &ev);
  82 }
  83
  84 bool EPollEngine::DelFd(EventHandler* eh, bool force)
  85 {
  86         int fd = eh->GetFd();
  87         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
  88                 return false;
  89
  90         struct epoll_event ev;
  91         memset(&ev,0,sizeof(struct epoll_event));
  92         eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
  93         ev.data.fd = fd;
  94         int i = epoll_ctl(EngineHandle, EPOLL_CTL_DEL, fd, &ev);
  95
  96         if (i < 0 && !force)
  97         {
  98                 ServerInstance->Log(DEBUG,"Cant remove socket: %s", strerror(errno));
  99                 return false;
 100         }
 101
 102         ref[fd] = NULL;
 103         CurrentSetSize--;
 104
 105         ServerInstance->Log(DEBUG,"Remove file descriptor: %d", fd);
 106         return true;
 107 }
 108
 109 int EPollEngine::GetMaxFds()
 110 {
 111         return MAX_DESCRIPTORS;
 112 }
 113
 114 int EPollEngine::GetRemainingFds()
 115 {
 116         return MAX_DESCRIPTORS - CurrentSetSize;
 117 }
 118
 119 int EPollEngine::DispatchEvents()
 120 {
 121         socklen_t codesize;
 122         int errcode;
 123         int i = epoll_wait(EngineHandle, events, MAX_DESCRIPTORS, 1000);
 124
 125         ServerInstance->Log(DEBUG,"DispatchEvents num events = %d of %d", i, CurrentSetSize);
 126
 127         for (int j = 0; j < i; j++)
 128         {
 129                 if (events[j].events & EPOLLHUP)
 130                 {
 131                         if (ref[events[j].data.fd])
 132                                 ref[events[j].data.fd]->HandleEvent(EVENT_ERROR, 0);
 133                         continue;
 134                 }
 135                 if (events[j].events & EPOLLERR)
 136                 {
 137                         /* Get error number */
 138                         if (getsockopt(events[j].data.fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
 139                                 errcode = errno;
 140                         if (ref[events[j].data.fd])
 141                                 ref[events[j].data.fd]->HandleEvent(EVENT_ERROR, errcode);
 142                         continue;
 143                 }
 144                 if (events[j].events & EPOLLOUT)
 145                 {
 146                         struct epoll_event ev;
 147                         memset(&ev,0,sizeof(struct epoll_event));
 148                         ev.events = EPOLLIN;
 149                         ev.data.fd = events[j].data.fd;
 150                         epoll_ctl(EngineHandle, EPOLL_CTL_MOD, events[j].data.fd, &ev);
 151                         if (ref[events[j].data.fd])
 152                                 ref[events[j].data.fd]->HandleEvent(EVENT_WRITE);
 153                 }
 154                 else
 155                 {
 156                         if (ref[events[j].data.fd])
 157                                 ref[events[j].data.fd]->HandleEvent(EVENT_READ);
 158                 }
 159         }
 160
 161         return i;
 162 }
 163
 164 std::string EPollEngine::GetName()
 165 {
 166         return "epoll";
 167 }
 168