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